From e6b88d5a0f395dddc4afd5f89f0e83d431253bba Mon Sep 17 00:00:00 2001 From: Dawid Sobczak Date: Thu, 6 Jul 2023 11:48:59 +0100 Subject: [PATCH] Add stage 06: Lua bootstrap The goal of stage 06 is to try parse zig synax in lua. I pulled in lpeglable 1.2.0 and parser-gen off github to get started. All of this needs to be cleaned up rather soon. Lua boostraps using tcc and musl from the previous stage. Since musl 0.6.0 doesn't support dynamic linking this build of lua doesn't support shared libraries. I couldn't easily patch musl with dlopen and friends so instead I link statically and call deps with c api. --- 05/Makefile | 4 +- 06/.gitignore | 3 + 06/Lexer.lua | 128 + 06/Makefile | 33 + 06/README.md | 4 + 06/lpeglabel/.gitignore | 2 + 06/lpeglabel/HISTORY | 32 + 06/lpeglabel/LICENSE | 22 + 06/lpeglabel/README.md | 727 + 06/lpeglabel/examples/expRec.lua | 128 + 06/lpeglabel/examples/expRecAut.lua | 122 + 06/lpeglabel/examples/farthest.lua | 14 + 06/lpeglabel/examples/listId1.lua | 33 + 06/lpeglabel/examples/listId2.lua | 39 + 06/lpeglabel/examples/listId2Rec2.lua | 67 + 06/lpeglabel/examples/listId2Rec2Cap.lua | 79 + 06/lpeglabel/examples/listIdRe1.lua | 30 + 06/lpeglabel/examples/listIdRe2.lua | 71 + 06/lpeglabel/examples/tiny.lua | 151 + 06/lpeglabel/examples/typedlua/test.lua | 2572 ++++ 06/lpeglabel/examples/typedlua/tlerror.lua | 66 + 06/lpeglabel/examples/typedlua/tllexer.lua | 105 + 06/lpeglabel/examples/typedlua/tlp.lua | 20 + 06/lpeglabel/examples/typedlua/tlparser.lua | 245 + 06/lpeglabel/lpcap.c | 537 + 06/lpeglabel/lpcap.h | 43 + 06/lpeglabel/lpcode.c | 1035 ++ 06/lpeglabel/lpcode.h | 42 + 06/lpeglabel/lpeglabel-logo.png | Bin 0 -> 14115 bytes 06/lpeglabel/lpprint.c | 263 + 06/lpeglabel/lpprint.h | 36 + 06/lpeglabel/lptree.c | 1363 ++ 06/lpeglabel/lptree.h | 82 + 06/lpeglabel/lptypes.h | 171 + 06/lpeglabel/lpvm.c | 429 + 06/lpeglabel/lpvm.h | 60 + 06/lpeglabel/makefile | 57 + 06/lpeglabel/old_makefile | 60 + 06/lpeglabel/relabel.lua | 398 + .../rockspecs/lpeglabel-0.12.2-1.rockspec | 32 + .../rockspecs/lpeglabel-0.12.2-2.rockspec | 32 + .../rockspecs/lpeglabel-1.0.0-1.rockspec | 32 + .../rockspecs/lpeglabel-1.1.0-1.rockspec | 32 + .../rockspecs/lpeglabel-1.2.0-1.rockspec | 32 + 06/lpeglabel/test.lua | 1449 ++ 06/lpeglabel/testlabel.lua | 1054 ++ 06/lpeglabel/testrelabelparser.lua | 549 + 06/lua-5.4.6/.gitignore | 5 + 06/lua-5.4.6/Makefile | 106 + 06/lua-5.4.6/README | 6 + 06/lua-5.4.6/doc/contents.html | 678 + 06/lua-5.4.6/doc/index.css | 21 + 06/lua-5.4.6/doc/logo.gif | Bin 0 -> 9893 bytes 06/lua-5.4.6/doc/lua.1 | 155 + 06/lua-5.4.6/doc/lua.css | 161 + 06/lua-5.4.6/doc/luac.1 | 118 + 06/lua-5.4.6/doc/manual.css | 21 + 06/lua-5.4.6/doc/manual.html | 12046 ++++++++++++++++ 06/lua-5.4.6/doc/osi-certified-72x60.png | Bin 0 -> 3774 bytes 06/lua-5.4.6/doc/readme.html | 337 + 06/lua-5.4.6/src/Makefile | 225 + 06/lua-5.4.6/src/lapi.c | 1463 ++ 06/lua-5.4.6/src/lapi.h | 52 + 06/lua-5.4.6/src/lauxlib.c | 1112 ++ 06/lua-5.4.6/src/lauxlib.h | 301 + 06/lua-5.4.6/src/lbaselib.c | 549 + 06/lua-5.4.6/src/lcode.c | 1871 +++ 06/lua-5.4.6/src/lcode.h | 104 + 06/lua-5.4.6/src/lcorolib.c | 210 + 06/lua-5.4.6/src/lctype.c | 64 + 06/lua-5.4.6/src/lctype.h | 101 + 06/lua-5.4.6/src/ldblib.c | 483 + 06/lua-5.4.6/src/ldebug.c | 924 ++ 06/lua-5.4.6/src/ldebug.h | 63 + 06/lua-5.4.6/src/ldo.c | 1024 ++ 06/lua-5.4.6/src/ldo.h | 88 + 06/lua-5.4.6/src/ldump.c | 230 + 06/lua-5.4.6/src/lfunc.c | 294 + 06/lua-5.4.6/src/lfunc.h | 64 + 06/lua-5.4.6/src/lgc.c | 1739 +++ 06/lua-5.4.6/src/lgc.h | 202 + 06/lua-5.4.6/src/linit.c | 65 + 06/lua-5.4.6/src/liolib.c | 828 ++ 06/lua-5.4.6/src/ljumptab.h | 112 + 06/lua-5.4.6/src/llex.c | 581 + 06/lua-5.4.6/src/llex.h | 91 + 06/lua-5.4.6/src/llimits.h | 380 + 06/lua-5.4.6/src/lmathlib.c | 764 + 06/lua-5.4.6/src/lmem.c | 215 + 06/lua-5.4.6/src/lmem.h | 93 + 06/lua-5.4.6/src/loadlib.c | 767 + 06/lua-5.4.6/src/lobject.c | 602 + 06/lua-5.4.6/src/lobject.h | 815 ++ 06/lua-5.4.6/src/lopcodes.c | 104 + 06/lua-5.4.6/src/lopcodes.h | 405 + 06/lua-5.4.6/src/lopnames.h | 103 + 06/lua-5.4.6/src/loslib.c | 428 + 06/lua-5.4.6/src/lparser.c | 1967 +++ 06/lua-5.4.6/src/lparser.h | 171 + 06/lua-5.4.6/src/lprefix.h | 45 + 06/lua-5.4.6/src/lstate.c | 445 + 06/lua-5.4.6/src/lstate.h | 409 + 06/lua-5.4.6/src/lstring.c | 273 + 06/lua-5.4.6/src/lstring.h | 57 + 06/lua-5.4.6/src/lstrlib.c | 1874 +++ 06/lua-5.4.6/src/ltable.c | 980 ++ 06/lua-5.4.6/src/ltable.h | 65 + 06/lua-5.4.6/src/ltablib.c | 430 + 06/lua-5.4.6/src/ltm.c | 271 + 06/lua-5.4.6/src/ltm.h | 104 + 06/lua-5.4.6/src/lua.c | 679 + 06/lua-5.4.6/src/lua.h | 523 + 06/lua-5.4.6/src/lua.hpp | 9 + 06/lua-5.4.6/src/luac.c | 723 + 06/lua-5.4.6/src/luaconf.h | 793 + 06/lua-5.4.6/src/lualib.h | 52 + 06/lua-5.4.6/src/lundump.c | 335 + 06/lua-5.4.6/src/lundump.h | 36 + 06/lua-5.4.6/src/lutf8lib.c | 291 + 06/lua-5.4.6/src/lvm.c | 1901 +++ 06/lua-5.4.6/src/lvm.h | 141 + 06/lua-5.4.6/src/lzio.c | 68 + 06/lua-5.4.6/src/lzio.h | 66 + 06/main.lua | 44 + 06/parser-gen/LICENSE | 20 + 06/parser-gen/README.md | 397 + 06/parser-gen/equals.lua | 32 + 06/parser-gen/errorgen.lua | 401 + 06/parser-gen/parser-gen-tests.lua | 160 + 06/parser-gen/parser-gen.lua | 566 + 06/parser-gen/parsers/lua-5.3.4-tests/all.lua | 292 + 06/parser-gen/parsers/lua-5.3.4-tests/api.lua | 1172 ++ .../parsers/lua-5.3.4-tests/attrib.lua | 470 + 06/parser-gen/parsers/lua-5.3.4-tests/big.lua | 82 + .../parsers/lua-5.3.4-tests/bitwise.lua | 328 + .../parsers/lua-5.3.4-tests/calls.lua | 401 + .../parsers/lua-5.3.4-tests/closure.lua | 247 + .../parsers/lua-5.3.4-tests/code.lua | 239 + .../parsers/lua-5.3.4-tests/constructs.lua | 313 + .../parsers/lua-5.3.4-tests/coroutine.lua | 874 ++ 06/parser-gen/parsers/lua-5.3.4-tests/db.lua | 857 ++ .../parsers/lua-5.3.4-tests/errors.lua | 537 + .../parsers/lua-5.3.4-tests/events.lua | 456 + .../parsers/lua-5.3.4-tests/files.lua | 793 + 06/parser-gen/parsers/lua-5.3.4-tests/gc.lua | 624 + .../parsers/lua-5.3.4-tests/goto.lua | 232 + .../parsers/lua-5.3.4-tests/literals.lua | 302 + .../parsers/lua-5.3.4-tests/locals.lua | 162 + .../parsers/lua-5.3.4-tests/main.lua | 381 + .../parsers/lua-5.3.4-tests/math.lua | 824 ++ .../parsers/lua-5.3.4-tests/nextvar.lua | 631 + 06/parser-gen/parsers/lua-5.3.4-tests/pm.lua | 374 + .../parsers/lua-5.3.4-tests/sort.lua | 310 + .../parsers/lua-5.3.4-tests/strings.lua | 379 + .../parsers/lua-5.3.4-tests/tpack.lua | 322 + .../parsers/lua-5.3.4-tests/utf8.lua | 210 + .../parsers/lua-5.3.4-tests/vararg.lua | 142 + .../parsers/lua-5.3.4-tests/verybig.lua | 152 + 06/parser-gen/parsers/lua-parser-tests.lua | 799 + 06/parser-gen/parsers/lua-parser.lua | 291 + 06/parser-gen/parsers/tiny-parser.lua | 55 + 06/parser-gen/peg-parser-tests.lua | 260 + 06/parser-gen/peg-parser.lua | 334 + .../rockspecs/parser-gen-1.0.rockspec | 27 + .../rockspecs/parser-gen-1.1.rockspec | 27 + .../rockspecs/parser-gen-1.2.rockspec | 27 + 06/parser-gen/stack.lua | 67 + 06/src/main.c | 24 + 06/zig.peg | 518 + Makefile | 2 + 170 files changed, 72518 insertions(+), 2 deletions(-) create mode 100644 06/.gitignore create mode 100644 06/Lexer.lua create mode 100644 06/Makefile create mode 100644 06/README.md create mode 100644 06/lpeglabel/.gitignore create mode 100644 06/lpeglabel/HISTORY create mode 100644 06/lpeglabel/LICENSE create mode 100644 06/lpeglabel/README.md create mode 100644 06/lpeglabel/examples/expRec.lua create mode 100644 06/lpeglabel/examples/expRecAut.lua create mode 100644 06/lpeglabel/examples/farthest.lua create mode 100644 06/lpeglabel/examples/listId1.lua create mode 100644 06/lpeglabel/examples/listId2.lua create mode 100644 06/lpeglabel/examples/listId2Rec2.lua create mode 100644 06/lpeglabel/examples/listId2Rec2Cap.lua create mode 100644 06/lpeglabel/examples/listIdRe1.lua create mode 100644 06/lpeglabel/examples/listIdRe2.lua create mode 100644 06/lpeglabel/examples/tiny.lua create mode 100755 06/lpeglabel/examples/typedlua/test.lua create mode 100644 06/lpeglabel/examples/typedlua/tlerror.lua create mode 100644 06/lpeglabel/examples/typedlua/tllexer.lua create mode 100644 06/lpeglabel/examples/typedlua/tlp.lua create mode 100644 06/lpeglabel/examples/typedlua/tlparser.lua create mode 100644 06/lpeglabel/lpcap.c create mode 100644 06/lpeglabel/lpcap.h create mode 100644 06/lpeglabel/lpcode.c create mode 100644 06/lpeglabel/lpcode.h create mode 100644 06/lpeglabel/lpeglabel-logo.png create mode 100644 06/lpeglabel/lpprint.c create mode 100644 06/lpeglabel/lpprint.h create mode 100644 06/lpeglabel/lptree.c create mode 100644 06/lpeglabel/lptree.h create mode 100644 06/lpeglabel/lptypes.h create mode 100644 06/lpeglabel/lpvm.c create mode 100644 06/lpeglabel/lpvm.h create mode 100644 06/lpeglabel/makefile create mode 100644 06/lpeglabel/old_makefile create mode 100644 06/lpeglabel/relabel.lua create mode 100644 06/lpeglabel/rockspecs/lpeglabel-0.12.2-1.rockspec create mode 100644 06/lpeglabel/rockspecs/lpeglabel-0.12.2-2.rockspec create mode 100644 06/lpeglabel/rockspecs/lpeglabel-1.0.0-1.rockspec create mode 100644 06/lpeglabel/rockspecs/lpeglabel-1.1.0-1.rockspec create mode 100644 06/lpeglabel/rockspecs/lpeglabel-1.2.0-1.rockspec create mode 100755 06/lpeglabel/test.lua create mode 100644 06/lpeglabel/testlabel.lua create mode 100644 06/lpeglabel/testrelabelparser.lua create mode 100644 06/lua-5.4.6/.gitignore create mode 100644 06/lua-5.4.6/Makefile create mode 100644 06/lua-5.4.6/README create mode 100644 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06/lua-5.4.6/src/lopcodes.h create mode 100644 06/lua-5.4.6/src/lopnames.h create mode 100644 06/lua-5.4.6/src/loslib.c create mode 100644 06/lua-5.4.6/src/lparser.c create mode 100644 06/lua-5.4.6/src/lparser.h create mode 100644 06/lua-5.4.6/src/lprefix.h create mode 100644 06/lua-5.4.6/src/lstate.c create mode 100644 06/lua-5.4.6/src/lstate.h create mode 100644 06/lua-5.4.6/src/lstring.c create mode 100644 06/lua-5.4.6/src/lstring.h create mode 100644 06/lua-5.4.6/src/lstrlib.c create mode 100644 06/lua-5.4.6/src/ltable.c create mode 100644 06/lua-5.4.6/src/ltable.h create mode 100644 06/lua-5.4.6/src/ltablib.c create mode 100644 06/lua-5.4.6/src/ltm.c create mode 100644 06/lua-5.4.6/src/ltm.h create mode 100644 06/lua-5.4.6/src/lua.c create mode 100644 06/lua-5.4.6/src/lua.h create mode 100644 06/lua-5.4.6/src/lua.hpp create mode 100644 06/lua-5.4.6/src/luac.c create mode 100644 06/lua-5.4.6/src/luaconf.h create mode 100644 06/lua-5.4.6/src/lualib.h create mode 100644 06/lua-5.4.6/src/lundump.c create mode 100644 06/lua-5.4.6/src/lundump.h create mode 100644 06/lua-5.4.6/src/lutf8lib.c create mode 100644 06/lua-5.4.6/src/lvm.c create mode 100644 06/lua-5.4.6/src/lvm.h create mode 100644 06/lua-5.4.6/src/lzio.c create mode 100644 06/lua-5.4.6/src/lzio.h create mode 100644 06/main.lua create mode 100644 06/parser-gen/LICENSE create mode 100644 06/parser-gen/README.md create mode 100644 06/parser-gen/equals.lua create mode 100644 06/parser-gen/errorgen.lua create mode 100644 06/parser-gen/parser-gen-tests.lua create mode 100644 06/parser-gen/parser-gen.lua create mode 100644 06/parser-gen/parsers/lua-5.3.4-tests/all.lua create mode 100644 06/parser-gen/parsers/lua-5.3.4-tests/api.lua create mode 100644 06/parser-gen/parsers/lua-5.3.4-tests/attrib.lua create mode 100644 06/parser-gen/parsers/lua-5.3.4-tests/big.lua create mode 100644 06/parser-gen/parsers/lua-5.3.4-tests/bitwise.lua create mode 100644 06/parser-gen/parsers/lua-5.3.4-tests/calls.lua create mode 100644 06/parser-gen/parsers/lua-5.3.4-tests/closure.lua create mode 100644 06/parser-gen/parsers/lua-5.3.4-tests/code.lua create mode 100644 06/parser-gen/parsers/lua-5.3.4-tests/constructs.lua create mode 100644 06/parser-gen/parsers/lua-5.3.4-tests/coroutine.lua create mode 100644 06/parser-gen/parsers/lua-5.3.4-tests/db.lua create mode 100644 06/parser-gen/parsers/lua-5.3.4-tests/errors.lua create mode 100644 06/parser-gen/parsers/lua-5.3.4-tests/events.lua create mode 100644 06/parser-gen/parsers/lua-5.3.4-tests/files.lua create mode 100644 06/parser-gen/parsers/lua-5.3.4-tests/gc.lua create mode 100644 06/parser-gen/parsers/lua-5.3.4-tests/goto.lua create mode 100644 06/parser-gen/parsers/lua-5.3.4-tests/literals.lua create mode 100644 06/parser-gen/parsers/lua-5.3.4-tests/locals.lua create mode 100644 06/parser-gen/parsers/lua-5.3.4-tests/main.lua create mode 100644 06/parser-gen/parsers/lua-5.3.4-tests/math.lua create mode 100644 06/parser-gen/parsers/lua-5.3.4-tests/nextvar.lua create mode 100644 06/parser-gen/parsers/lua-5.3.4-tests/pm.lua create mode 100644 06/parser-gen/parsers/lua-5.3.4-tests/sort.lua create mode 100644 06/parser-gen/parsers/lua-5.3.4-tests/strings.lua create mode 100644 06/parser-gen/parsers/lua-5.3.4-tests/tpack.lua create mode 100644 06/parser-gen/parsers/lua-5.3.4-tests/utf8.lua create mode 100644 06/parser-gen/parsers/lua-5.3.4-tests/vararg.lua create mode 100644 06/parser-gen/parsers/lua-5.3.4-tests/verybig.lua create mode 100644 06/parser-gen/parsers/lua-parser-tests.lua create mode 100644 06/parser-gen/parsers/lua-parser.lua create mode 100644 06/parser-gen/parsers/tiny-parser.lua create mode 100644 06/parser-gen/peg-parser-tests.lua create mode 100644 06/parser-gen/peg-parser.lua create mode 100644 06/parser-gen/rockspecs/parser-gen-1.0.rockspec create mode 100644 06/parser-gen/rockspecs/parser-gen-1.1.rockspec create mode 100644 06/parser-gen/rockspecs/parser-gen-1.2.rockspec create mode 100644 06/parser-gen/stack.lua create mode 100644 06/src/main.c create mode 100644 06/zig.peg diff --git a/05/Makefile b/05/Makefile index c41f79f..74765e1 100644 --- a/05/Makefile +++ b/05/Makefile @@ -2,8 +2,8 @@ TCCDIR=tcc-0.9.27 TCC=$(TCCDIR)/tcc TCC0=$(TCC)0 TCCINST=tcc-bootstrap -all: out04 a.out tcc -in04: *.b ../04a/out04 +all: out04 a.out $(TCCDIR)/lib/libtcc1.a +in04: *.b ../04a/out04 ../04a/out04 main.b in04 out04: in04 ../04/out03 ../04/out03 in04 out04 diff --git a/06/.gitignore b/06/.gitignore new file mode 100644 index 0000000..cf83954 --- /dev/null +++ b/06/.gitignore @@ -0,0 +1,3 @@ +lua-bootstrap +**/*.o +zsh \ No newline at end of file diff --git a/06/Lexer.lua b/06/Lexer.lua new file mode 100644 index 0000000..b7051c1 --- /dev/null +++ b/06/Lexer.lua @@ -0,0 +1,128 @@ +Reverse = { + "addrspace", "align", "allowzero", "and", "anyframe", "anytype", "asm", "async", + "await", "break", "callconv", "catch", "comptime", "const", "continue", "defer", + "else", "enum", "errdefer", "error", "export", "extern", "fn", "for", "if", + "inline", "noalias", "noinline", "IDENTIFIER", "nosuspend", "opaque", "or", + "orelse", "packed", "pub", "resume", "return", "linksection", "struct", "suspend", + "switch", "test", "threadlocal", "try", "union", "unreachable", "usingnamespace", + "var", "volatile", "while", "INVALID", ".**", "!", "|", "||", "|=", "=", "==", + "=>", "!=", "(", ")", ";", "%", "%=", "{", "}", "[", "]", ".", ".*", "..", "...", + "^", "^=", "+", "++", "+=", "+%", "+%=", "+|", "+|=", "-", "-=", "-%", "-%=", "-|", + "-|=", "*", "*=", "**", "*%", "*%=", "*|", "*|=", "->", ":", "/", "/=", ",", "&", + "&=", "?", "<", "<=", "<<", "<<=", "<<|", "<<|=", ">", ">=", ">>", ">>=", "~", + "STRING_LITERAL", "CHAR_LITERAL", "EOF", "BUILTIN", "NUMBER_LITERAL", "DOC_COMMENT", + "CONTAINER_DOC_COMMENT", +} + +Tokens = { + ADDRSPACE = 1, ALIGN = 2, + ALLOWZERO = 3, AND = 4, + ANYFRAME = 5, ANYTYPE = 6, + ASM = 7, ASYNC = 8, + AWAIT = 9, BREAK = 10, + CALLCONV = 11, CATCH = 12, + COMPTIME = 13, CONST = 14, + CONTINUE = 15, DEFER = 16, + ELSE = 17, ENUM = 18, + ERRDEFER = 19, ERROR = 20, + EXPORT = 21, EXTERN = 22, + FN = 23, FOR = 24, + IF = 25, INLINE = 26, + NOALIAS = 27, NOINLINE = 28, + IDENTIFIER = 29, NOSUSPEND = 30, + OPAQUE = 31, OR = 32, + ORELSE = 33, PACKED = 34, + PUB = 35, RESUME = 36, + RETURN = 37, LINKSECTION = 38, + STRUCT = 39, SUSPEND = 40, + SWITCH = 41, TEST = 42, + THREADLOCAL = 43, TRY = 44, + UNION = 45, UNREACHABLE = 46, + USINGNAMESPACE = 47, VAR = 48, + VOLATILE = 49, WHILE = 50, + INVALID = 51, INVALID_PERIODASTERISKS = 52, + BANG = 53, PIPE = 54, + PIPE_PIPE = 55, PIPE_EQUAL = 56, + EQUAL = 57, EQUAL_EQUAL = 58, + EQUAL_ANGLE_BRACKET_RIGHT = 59, BANG_EQUAL = 60, + L_PAREN = 61, R_PAREN = 62, + SEMICOLON = 63, PERCENT = 64, + PERCENT_EQUAL = 65, L_BRACE = 66, + R_BRACE = 67, L_BRACKET = 68, + R_BRACKET = 69, PERIOD = 70, + PERIOD_ASTERISK = 71, ELLIPSIS2 = 72, + ELLIPSIS3 = 73, CARET = 74, + CARET_EQUAL = 75, PLUS = 76, + PLUS_PLUS = 77, PLUS_EQUAL = 78, + PLUS_PERCENT = 79, PLUS_PERCENT_EQUAL = 80, + PLUS_PIPE = 81, PLUS_PIPE_EQUAL = 82, + MINUS = 83, MINUS_EQUAL = 84, + MINUS_PERCENT = 85, MINUS_PERCENT_EQUAL = 86, + MINUS_PIPE = 87, MINUS_PIPE_EQUAL = 88, + ASTERISK = 89, ASTERISK_EQUAL = 90, + ASTERISK_ASTERISK = 91, ASTERISK_PERCENT = 92, + ASTERISK_PERCENT_EQUAL = 93, ASTERISK_PIPE = 94, + ASTERISK_PIPE_EQUAL = 95, ARROW = 96, + COLON = 97, SLASH = 98, + SLASH_EQUAL = 99, COMMA = 100, + AMPERSAND = 101, AMPERSAND_EQUAL = 102, + QUESTION_MARK = 103, ANGLE_BRACKET_LEFT = 104, + ANGLE_BRACKET_LEFT_EQUAL = 105, ANGLE_BRACKET_ANGLE_BRACKET_LEFT = 106, + ANGLE_BRACKET_ANGLE_BRACKET_LEFT_EQUAL = 107, ANGLE_BRACKET_ANGLE_BRACKET_LEFT_PIPE = 108, + ANGLE_BRACKET_ANGLE_BRACKET_LEFT_PIPE_EQUAL = 109, ANGLE_BRACKET_RIGHT = 110, + ANGLE_BRACKET_RIGHT_EQUAL = 111, ANGLE_BRACKET_ANGLE_BRACKET_RIGHT = 112, + ANGLE_BRACKET_ANGLE_BRACKET_RIGHT_EQUAL = 113, TILDE = 114, + STRING_LITERAL = 115, CHAR_LITERAL = 116, + EOF = 117, BUILTIN = 118, + NUMBER_LITERAL = 119, DOC_COMMENT = 120, + CONTAINER_DOC_COMMENT = 121, +} + + +State = { + START = 1, IDENTIFIER = 2, + BUILTIN = 3, STRING_LITERAL = 5, + STRING_LITERAL_BACKSLASH = 6, MULTILINE_STRING_LITERAL_LINE = 7, + CHAR_LITERAL = 8, CHAR_LITERAL_BACKSLASH = 9, + CHAR_LITERAL_HEX_ESCAPE = 10, CHAR_LITERAL_UNICODE_ESCAPE_SAW_U = 11, + CHAR_LITERAL_UNICODE_ESCAPE = 12, CHAR_LITERAL_UNICODE_INVALID = 13, + CHAR_LITERAL_UNICODE = 14, CHAR_LITERAL_END = 15, + BACKSLASH = 16, EQUAL = 17, + BANG = 18, PIPE = 19, + MINUS = 20, MINUS_PERCENT = 21, + MINUS_PIPE = 22, ASTERISK = 23, + ASTERISK_PERCENT = 24, ASTERISK_PIPE = 25, + SLASH = 26, LINE_COMMENT_START = 27, + LINE_COMMENT = 28, DOC_COMMENT_START = 29, + DOC_COMMENT = 30, INT = 31, + INT_EXPONENT = 32, INT_PERIOD = 33, + FLOAT = 34, FLOAT_EXPONENT = 35, + AMPERSAND = 36, CARET = 37, + PERCENT = 38, PLUS = 39, + PLUS_PERCENT = 40, PLUS_PIPE = 41, + ANGLE_BRACKET_LEFT = 42, ANGLE_BRACKET_ANGLE_BRACKET_LEFT = 43, + ANGLE_BRACKET_ANGLE_BRACKET_LEFT_PIPE = 44, ANGLE_BRACKET_RIGHT = 45, + ANGLE_BRACKET_ANGLE_BRACKET_RIGHT = 46, PERIOD = 47, + PERIOD_2 = 48, PERIOD_ASTERISK = 49, + SAW_AT_SIGN = 50, +} + +Lexer = { + Reverse, + Tokens, + State, + x = 0, +} + +function Lexer:new() + local l = {} + setmetatable(l, self) + self.__index = self + return l +end + +function Lexer:lex(char) + +end + +return Lexer \ No newline at end of file diff --git a/06/Makefile b/06/Makefile new file mode 100644 index 0000000..e770cd4 --- /dev/null +++ b/06/Makefile @@ -0,0 +1,33 @@ +CC= ../05/tcc-0.9.27/tcc +TCCINST= ../05/tcc-bootstrap +MUSLINST= ../05/musl-bootstrap +LUAINST= lua-bootstrap + +CFLAGS= -I $(MUSLINST)/include -I $(LUAINST)/include -I lpeglabel +SRCS = $(sort $(wildcard **/*.c)) +OBJS = $(SRCS:.c=.o) + +all: zsh + +lua-bootstrap/lib/liblua.a: + $(MAKE) -j8 -C lua-5.4.6 + $(MAKE) -C lua-5.4.6 install + +%.o: %.c lua-bootstrap/lib/liblua.a + $(CC) $(CFLAGS) -c -o $@ $< + +zsh: $(OBJS) lua-bootstrap/lib/liblua.a + $(CC) -nostdlib -B $(TCCINST) -o zsh $(OBJS) $(LUAINST)/lib/liblua.a $(MUSLINST)/lib/*.[oa] + +run: zsh + ./zsh + +c: + rm -f zsh + rm -f src/*.o + rm -f lpeglabel/*.o + +clean: c + rm -rf lua-bootstrap + $(MAKE) -C lua-5.4.6 clean + diff --git a/06/README.md b/06/README.md new file mode 100644 index 0000000..6b1d35a --- /dev/null +++ b/06/README.md @@ -0,0 +1,4 @@ +TODO: Fix 05 stage tcc compiler that causes some non-descript linker error whenever a generated executable is executed + +Error +> Inconsistency detected by ld.so: dl-fini.c: 92: _dl_fini: Assertion `ns != LM_ID_BASE || i == nloaded' failed! \ No newline at end of file diff --git a/06/lpeglabel/.gitignore b/06/lpeglabel/.gitignore new file mode 100644 index 0000000..8ddf7f8 --- /dev/null +++ b/06/lpeglabel/.gitignore @@ -0,0 +1,2 @@ +lpeglabel.so +*.o \ No newline at end of file diff --git a/06/lpeglabel/HISTORY b/06/lpeglabel/HISTORY new file mode 100644 index 0000000..13eb31c --- /dev/null +++ b/06/lpeglabel/HISTORY @@ -0,0 +1,32 @@ +HISTORY for LPegLabel 1.2.0-1 + +* Changes from version 1.1.0-1 to 1.2.0-1 + --------------------------------- + + fixes bug when reporting the error position of an ordinary failure + + reports the farthest failure position for ordinary failures + + +* Changes from version 1.0.0-1 to 1.1.0-1 + --------------------------------- + + new semantics of lpeglabel.Rec + - labeled ordered choice removed + + examples updated + + +* Changes from version 0.12.2-2 to 1.0.0-1 + --------------------------------- + + base code updated to LPeg 1.0 + + new functions: lpeglabel.Rec and relabel.calcline + + improved documentation + + new examples + + some bugs fixed + + +* Changes from version 0.12.2-1 to 0.12.2-2 + --------------------------------- + + in case of a failure, "match" also returns a suffix of the input + + improved error reporting for "relabel", thanks to Matthew Allen + + limit of labels increased from 32 to 64, thanks to André Maidl + + compiles with Lua 5.1, thanks to Matthew Allen + + the throw operator now throws only one label + + some bugs fixed diff --git a/06/lpeglabel/LICENSE b/06/lpeglabel/LICENSE new file mode 100644 index 0000000..27faf04 --- /dev/null +++ b/06/lpeglabel/LICENSE @@ -0,0 +1,22 @@ +The MIT License (MIT) + +Copyright (c) 2014-2016 Sérgio Medeiros + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. + diff --git a/06/lpeglabel/README.md b/06/lpeglabel/README.md new file mode 100644 index 0000000..ddad3c8 --- /dev/null +++ b/06/lpeglabel/README.md @@ -0,0 +1,727 @@ +

LPegLabel

+ +## LPegLabel - Parsing Expression Grammars (with Labels) for Lua + +--- + +### Introduction + +LPegLabel is a conservative extension of the +[LPeg](http://www.inf.puc-rio.br/~roberto/lpeg) +library that provides an implementation of Parsing +Expression Grammars (PEGs) with labeled failures. +Labels can be used to signal different kinds of errors +and to specify which recovery pattern should handle a +given label. Labels can also be combined with the standard +patterns of LPeg. + +Besides that, LPegLabel also reports the farthest +failure position in case of an ordinary failure +(which is represented by label **0**). + +This document describes the new functions available +in LpegLabel and presents some examples of usage. + +With labeled failures it is possible to distinguish +between an ordinary failure and an error. Usually, an +ordinary failure is produced when the matching of a +character fails, and this failure is caught by ordered choice. +An error (a non-ordinary failure), by its turn, is produced +by the throw operator and may be caught by the recovery operator. + +In LPegLabel, the result of an unsuccessful matching +is a triple **nil, lab, sfail**, where **lab** +is the label associated with the failure, and +**sfail** is the suffix input being matched when +**lab** was thrown. + +When **lab** is an ordinary failure and no error was thrown before, +**sfail** is formed according to the farthest position where an +ordinary failure occurred. +In case **lab** is an ordinary failure and an error +was thrown before, **sfail** is the farthest suffix +where an ordinary failure occurred after the last error. + +Below there is a brief summary of the new functions provided by LpegLabel: + + + + + + + + + + + + + + + +
FunctionDescription
lpeglabel.T (l)Throws a label l to signal an error
lpeglabel.Rec (p1, p2, l1 [, l2, ..., ln])Specifies a recovery pattern p2 for p1, + when the matching of p1 gives one of the labels l1, ..., ln.
%{l}Syntax of relabel module. Equivalent to lpeglabel.T(l) +
p1 //{l1 [, l2, ..., ln} p2Syntax of relabel module. Equivalent to lpeglabel.Rec(p1, p2, l1, ..., ln) +
relabel.calcline(subject, i)Calculates line and column information regarding position i of the subject +
relabel.setlabels (tlabel)Allows to specicify a table with mnemonic labels. +
+ + +### Functions + + +#### lpeglabel.T(l) + +Returns a pattern that throws the label `l`. +A label must be an integer between 1 and 255. + +This pattern always causes a failure, whose associated +position will be used to set **sfail**, no matter +whether this is the farthest failure position or not. + + +#### lpeglabel.Rec(p1, p2, l1, ..., ln) + +Returns a *recovery pattern*. +If the matching of `p1` gives one of the labels `l1, ..., ln`, +then the matching of `p2` is tried from the failure position of `p1`. +Otherwise, the result of the matching of `p1` is the pattern's result. + + +#### %{l} + +Syntax of *relabel* module. Equivalent to `lpeg.T(l)`. + + +#### p1 //{l1, ..., ln} p2 + +Syntax of *relabel* module. Equivalent to `lpeglabel.Rec(p1, p2, l1, ..., ln)`. + +The `//{}` operator is left-associative. + + + +#### relabel.calcline (subject, i) + +Returns line and column information regarding position i of the subject. + + +#### relabel.setlabels (tlabel) + +Allows to specicify a table with labels. They keys of +`tlabel` must be integers between 1 and 255, +and the associated values should be strings. + + +### Examples + +Below there a few examples of usage of LPegLabel. +The code of these and of other examples is available +in the *examples* directory. + + +#### Reporting the farthest failure + +This example illustrates the new values returned +by the *match* function in case of an unsuccessful +matching. As no error is thrown, when the matching +fails *sfail* represents the farthest suffix where +an ordinary failure occurred. + +```lua +local m = require'lpeglabel' + +function matchPrint(p, s) + local r, lab, sfail = p:match(s) + print("r: ", r, "lab: ", lab, "sfail: ", sfail) +end + +local p = m.P"a"^0 * m.P"b" + m.P"c" +matchPrint(p, "abc") --> r: 3 lab: nil sfail: nil +matchPrint(p, "c") --> r: 2 lab: nil sfail: nil +matchPrint(p, "aac") --> r: nil lab: 0 sfail: c +matchPrint(p, "xxc") --> r: nil lab: 0 sfail: xxc +``` + +#### Matching a list of identifiers separated by commas + +The following example defines a grammar that matches +a list of identifiers separated by commas. A label +is thrown when there is an error matching an identifier +or a comma. + +We use function `newError` to store error messages in a +table and to return the index associated with each error message. + + +```lua +local m = require'lpeglabel' +local re = require'relabel' + +local terror = {} + +local function newError(s) + table.insert(terror, s) + return #terror +end + +local errUndef = newError("undefined") +local errId = newError("expecting an identifier") +local errComma = newError("expecting ','") + +local g = m.P{ + "S", + S = m.V"Id" * m.V"List", + List = -m.P(1) + (m.V"Comma" + m.T(errComma)) * (m.V"Id" + m.T(errId)) * m.V"List", + Id = m.V"Sp" * m.R'az'^1, + Comma = m.V"Sp" * ",", + Sp = m.S" \n\t"^0, +} + +function mymatch (g, s) + local r, e, sfail = g:match(s) + if not r then + local line, col = re.calcline(s, #s - #sfail) + local msg = "Error at line " .. line .. " (col " .. col .. "): " + return r, msg .. terror[e] .. " before '" .. sfail .. "'" + end + return r +end + +print(mymatch(g, "one,two")) --> 8 +print(mymatch(g, "one two")) --> nil Error at line 1 (col 3): expecting ',' before ' two' +print(mymatch(g, "one,\n two,\nthree,")) --> nil Error at line 3 (col 6): expecting an identifier before '' +``` + +In this example we could think about writing rule List as follows: +```lua +List = ((m.V"Comma" + m.T(errComma)) * (m.V"Id" + m.T(errId)))^0, +``` + +but when matching this expression against the end of input +we would get a failure whose associated label would be **errComma**, +and this would cause the failure of the *whole* repetition. + + + +#### Error Recovery + +By using the `Rec` function we can specify a recovery pattern that +should be matched when a label is thrown. After matching the recovery +pattern, and possibly recording the error, the parser will resume +the regular matching. For example, in the example below +we expect to match rule `A`, but when a failure occur the label 42 +is thrown and then we will try to match the recovery pattern `recp`: +```lua +local m = require'lpeglabel' + +local recp = m.P"oast" + +local g = m.P{ + "S", + S = m.Rec(m.V"A", recp, 42) * ".", + A = m.P"t" * (m.P"est" + m.T(42)) +} + +print(g:match("test.")) --> 6 +print(g:match("toast.")) --> 7 +print(g:match("oast.")) --> nil 0 oast. +print(g:match("toward.")) --> nil 0 ward. +``` +When trying to match subject 'toast.', in rule `A` the first +'t' is matched, then the matching of `m.P"est"` fails and label 42 +is thrown, with the associated inpux suffix 'oast.'. In rule +`S` label 42 is caught and the recovery pattern matches 'oast', +so pattern `'.'` matches the rest of the input. + +When matching subject 'oast.', pattern `m.P"t"` fails, and +the result of the matching is nil, 0, oast.. + +When matching 'toward.', label 42 is thrown after matching 't', +with the associated input suffix 'oward.'. As the matching of the +recovery pattern fails, the result is nil, 0, ward.. + +Usually, the recovery pattern is an expression that does not fail. +In the previous example, we could have used `(m.P(1) - m.P".")^0` +as the recovery pattern. + +Below we rewrite the grammar that describes a list of identifiers +to use a recovery strategy. Grammar `g` remains the same, but we add a +recovery grammar `grec` that handles the labels thrown by `g`. + +In grammar `grec` we use functions `record` and `sync`. +Function `record`, plus function `recorderror`, will help +us to save the input position where a label was thrown, +while function `sync` will give us a synchronization pattern, +that consumes the input while is not possible to match a given +pattern `p`. + +When the matching of an identifier fails, a defaul value ('NONE') +is provided. + +```lua +local m = require'lpeglabel' +local re = require'relabel' + +local terror = {} + +local function newError(s) + table.insert(terror, s) + return #terror +end + +local errUndef = newError("undefined") +local errId = newError("expecting an identifier") +local errComma = newError("expecting ','") + +local id = m.R'az'^1 + +local g = m.P{ + "S", + S = m.V"Id" * m.V"List", + List = -m.P(1) + m.V"Comma" * m.V"Id" * m.V"List", + Id = m.V"Sp" * id + m.T(errId), + Comma = m.V"Sp" * "," + m.T(errComma), + Sp = m.S" \n\t"^0, +} + +local subject, errors + +function recorderror(pos, lab) + local line, col = re.calcline(subject, pos) + table.insert(errors, { line = line, col = col, msg = terror[lab] }) +end + +function record (lab) + return (m.Cp() * m.Cc(lab)) / recorderror +end + +function sync (p) + return (-p * m.P(1))^0 +end + +local grec = m.P{ + "S", + S = m.Rec(m.Rec(g, m.V"ErrComma", errComma), m.V"ErrId", errId), + ErrComma = record(errComma) * sync(id), + ErrId = record(errId) * sync(m.P",") +} + + +function mymatch (g, s) + errors = {} + subject = s + local r, e, sfail = g:match(s) + if #errors > 0 then + local out = {} + for i, err in ipairs(errors) do + local msg = "Error at line " .. err.line .. " (col " .. err.col .. "): " .. err.msg + table.insert(out, msg) + end + return nil, table.concat(out, "\n") .. "\n" + end + return r +end + +print(mymatch(grec, "one,two")) +-- Captures (separated by ';'): one; two; +-- Syntactic errors found: 0 + +print(mymatch(grec, "one two three")) +-- Captures (separated by ';'): one; two; three; +-- Syntactic errors found: 2 +-- Error at line 1 (col 4): expecting ',' +-- Error at line 1 (col 8): expecting ',' + +print(mymatch(grec, "1,\n two, \n3,")) +-- Captures (separated by ';'): NONE; two; NONE; NONE; +-- Syntactic errors found: 3 +-- Error at line 1 (col 1): expecting an identifier +-- Error at line 2 (col 6): expecting an identifier +-- Error at line 3 (col 2): expecting an identifier + +print(mymatch(grec, "one\n two123, \nthree,")) +-- Captures (separated by ';'): one; two; three; NONE; +-- Syntactic errors found: 3 +-- Error at line 2 (col 1): expecting ',' +-- Error at line 2 (col 5): expecting ',' +-- Error at line 3 (col 6): expecting an identifier +``` + +##### *relabel* syntax + +Below we describe again a grammar that matches a list of identifiers, +now using the syntax supported by *relabel*, where `//{}` is the +recovery operator, and `%{}` is the throw operator: + +```lua +local re = require 'relabel' + +local errinfo = { + {"errUndef", "undefined"}, + {"errId", "expecting an identifier"}, + {"errComma", "expecting ','"}, +} + +local errmsgs = {} +local labels = {} + +for i, err in ipairs(errinfo) do + errmsgs[i] = err[2] + labels[err[1]] = i +end + +re.setlabels(labels) + +local g = re.compile[[ + S <- Id List + List <- !. / Comma Id List + Id <- Sp {[a-z]+} / %{errId} + Comma <- Sp ',' / %{errComma} + Sp <- %s* +]] + +local errors + +function recorderror (subject, pos, label) + local line, col = re.calcline(subject, pos) + table.insert(errors, { line = line, col = col, msg = errmsgs[labels[label]] }) + return true +end + +function sync (p) + return '( !(' .. p .. ') .)*' +end + +local grec = re.compile( + "S <- %g //{errComma} ErrComma //{errId} ErrId" .. "\n" .. + "ErrComma <- ('' -> 'errComma' => recorderror) " .. sync('[a-z]+') .. "\n" .. + "ErrId <- ('' -> 'errId' => recorderror) " .. sync('","') .. "-> default" + , {g = g, recorderror = recorderror, default = "NONE"} +) + +function mymatch (g, s) + errors = {} + subject = s + io.write("Input: ", s, "\n") + local r = { g:match(s) } + io.write("Captures (separated by ';'): ") + for k, v in pairs(r) do + io.write(v .. "; ") + end + io.write("\nSyntactic errors found: " .. #errors) + if #errors > 0 then + io.write("\n") + local out = {} + for i, err in ipairs(errors) do + local msg = "Error at line " .. err.line .. " (col " .. err.col .. "): " .. err.msg + table.insert(out, msg) + end + io.write(table.concat(out, "\n")) + end + print("\n") + return r +end + +print(mymatch(grec, "one,two")) +-- Captures (separated by ';'): one; two; +-- Syntactic errors found: 0 + +print(mymatch(grec, "one two three")) +-- Captures (separated by ';'): one; two; three; +-- Syntactic errors found: 2 +-- Error at line 1 (col 4): expecting ',' +-- Error at line 1 (col 8): expecting ',' + +print(mymatch(grec, "1,\n two, \n3,")) +-- Captures (separated by ';'): NONE; two; NONE; NONE; +-- Syntactic errors found: 3 +-- Error at line 1 (col 1): expecting an identifier +-- Error at line 2 (col 6): expecting an identifier +-- Error at line 3 (col 2): expecting an identifier + +print(mymatch(grec, "one\n two123, \nthree,")) +-- Captures (separated by ';'): one; two; three; NONE; +-- Syntactic errors found: 3 +-- Error at line 2 (col 1): expecting ',' +-- Error at line 2 (col 5): expecting ',' +-- Error at line 3 (col 6): expecting an identifier +``` + + +#### Arithmetic Expressions + +Here's an example of an LPegLabel grammar that matches an expression. +We have used a function `expect`, that takes a pattern `patt` and a label as +parameters and builds a new pattern that throws this label when `patt` +fails. + +When a subexpression is syntactically invalid, a default value of 1000 +is provided by the recovery pattern, so the evaluation of an expression +should always produce a numeric value. + +In this example, we can see that it may be a tedious and error prone +task to build manually the recovery grammar `grec`. In the next example +we will show how to build the recovery grammar in a more automatic way. + +```lua +local m = require"lpeglabel" +local re = require"relabel" + +local labels = { + {"ExpTermFirst", "expected an expression"}, + {"ExpTermOp", "expected a term after the operator"}, + {"MisClose", "missing a closing ')' after the expression"}, +} + +local function labelindex(labname) + for i, elem in ipairs(labels) do + if elem[1] == labname then + return i + end + end + error("could not find label: " .. labname) +end + +local errors, subject + +local function expect(patt, labname) + local i = labelindex(labname) + return patt + m.T(i) +end + + +local num = m.R("09")^1 / tonumber +local op = m.S("+-") + +local function compute(tokens) + local result = tokens[1] + for i = 2, #tokens, 2 do + if tokens[i] == '+' then + result = result + tokens[i+1] + elseif tokens[i] == '-' then + result = result - tokens[i+1] + else + error('unknown operation: ' .. tokens[i]) + end + end + return result +end + +local g = m.P { + "Exp", + Exp = m.Ct(m.V"OperandFirst" * (m.C(op) * m.V"Operand")^0) / compute, + OperandFirst = expect(m.V"Term", "ExpTermFirst"), + Operand = expect(m.V"Term", "ExpTermOp"), + Term = num + m.V"Group", + Group = "(" * m.V"Exp" * expect(")", "MisClose"), +} + +function recorderror(pos, lab) + local line, col = re.calcline(subject, pos) + table.insert(errors, { line = line, col = col, msg = labels[lab][2] }) +end + +function record (labname) + return (m.Cp() * m.Cc(labelindex(labname))) / recorderror +end + +function sync (p) + return (-p * m.P(1))^0 +end + +function defaultValue (p) + return p or m.Cc(1000) +end + +local grec = m.P { + "S", + S = m.Rec(m.V"A", m.V"ErrExpTermFirst", labelindex("ExpTermFirst")), + A = m.Rec(m.V"Sg", m.V"ErrExpTermOp", labelindex("ExpTermOp")), + Sg = m.Rec(g, m.V"ErrMisClose", labelindex("MisClose")), + ErrExpTermFirst = record("ExpTermFirst") * sync(op + ")") * defaultValue(), + ErrExpTermOp = record("ExpTermOp") * sync(op + ")") * defaultValue(), + ErrMisClose = record("MisClose") * sync(m.P")") * defaultValue(m.P""), +} + +local function eval(input) + errors = {} + io.write("Input: ", input, "\n") + subject = input + local result, label, suffix = grec:match(input) + io.write("Syntactic errors found: " .. #errors, "\n") + if #errors > 0 then + local out = {} + for i, err in ipairs(errors) do + local pos = err.col + local msg = err.msg + table.insert(out, "syntax error: " .. msg .. " (at index " .. pos .. ")") + end + print(table.concat(out, "\n")) + end + io.write("Result = ") + return result +end + +print(eval "90-70-(5)+3") +-- Syntactic errors found: 0 +-- Result = 18 + +print(eval "15+") +-- Syntactic errors found: 1 +-- syntax error: expected a term after the operator (at index 3) +-- Result = 1015 + +print(eval "-2") +-- Syntactic errors found: 1 +-- syntax error: expected an expression (at index 1) +-- Result = 998 + +print(eval "1+()+") +-- Syntactic errors found: 2 +-- syntax error: expected an expression (at index 4) +-- syntax error: expected a term after the operator (at index 5) +-- Result = 2001 + +print(eval "1+(") +-- Syntactic errors found: 2 +-- syntax error: expected an expression (at index 3) +-- syntax error: missing a closing ')' after the expression (at index 3) +-- Result = 1001 + +print(eval "3)") +-- Syntactic errors found: 0 +-- Result = 3 +``` + +#### Automatically Building the Recovery Grammar + +Below we rewrite the previous example to automatically +build the recovery grammar based on information provided +by the user for each label (error message, recovery pattern, etc). +In the example below we also throw an error when the grammar +does not match the whole subject. + +```lua +local m = require"lpeglabel" +local re = require"relabel" + +local num = m.R("09")^1 / tonumber +local op = m.S("+-") + +local labels = {} +local nlabels = 0 + +local function newError(lab, msg, psync, pcap) + nlabels = nlabels + 1 + psync = psync or m.P(-1) + pcap = pcap or m.P"" + labels[lab] = { id = nlabels, msg = msg, psync = psync, pcap = pcap } +end + +newError("ExpTermFirst", "expected an expression", op + ")", m.Cc(1000)) +newError("ExpTermOp", "expected a term after the operator", op + ")", m.Cc(1000)) +newError("MisClose", "missing a closing ')' after the expression", m.P")") +newError("Extra", "extra characters found after the expression") + +local errors, subject + +local function expect(patt, labname) + local i = labels[labname].id + return patt + m.T(i) +end + +local function compute(tokens) + local result = tokens[1] + for i = 2, #tokens, 2 do + if tokens[i] == '+' then + result = result + tokens[i+1] + elseif tokens[i] == '-' then + result = result - tokens[i+1] + else + error('unknown operation: ' .. tokens[i]) + end + end + return result +end + +local g = m.P { + "Exp", + Exp = m.Ct(m.V"OperandFirst" * (m.C(op) * m.V"Operand")^0) / compute, + OperandFirst = expect(m.V"Term", "ExpTermFirst"), + Operand = expect(m.V"Term", "ExpTermOp"), + Term = num + m.V"Group", + Group = "(" * m.V"Exp" * expect(")", "MisClose"), +} + +function recorderror(pos, lab) + local line, col = re.calcline(subject, pos) + table.insert(errors, { line = line, col = col, msg = labels[lab].msg }) +end + +function record (labname) + return (m.Cp() * m.Cc(labname)) / recorderror +end + +function sync (p) + return (-p * m.P(1))^0 +end + +function defaultValue (p) + return p or m.Cc(1000) +end + +local grec = g * expect(m.P(-1), "Extra") +for k, v in pairs(labels) do + grec = m.Rec(grec, record(k) * sync(v.psync) * v.pcap, v.id) +end + +local function eval(input) + errors = {} + io.write("Input: ", input, "\n") + subject = input + local result, label, suffix = grec:match(input) + io.write("Syntactic errors found: " .. #errors, "\n") + if #errors > 0 then + local out = {} + for i, err in ipairs(errors) do + local pos = err.col + local msg = err.msg + table.insert(out, "syntax error: " .. msg .. " (at index " .. pos .. ")") + end + print(table.concat(out, "\n")) + end + io.write("Result = ") + return result +end + +print(eval "90-70-(5)+3") +-- Syntactic errors found: 0 +-- Result = 18 + +print(eval "15+") +-- Syntactic errors found: 1 +-- syntax error: expected a term after the operator (at index 3) +-- Result = 1015 + +print(eval "-2") +-- Syntactic errors found: 1 +-- syntax error: expected an expression (at index 1) +-- Result = 998 + +print(eval "1+()+") +-- Syntactic errors found: 2 +-- syntax error: expected an expression (at index 4) +-- syntax error: expected a term after the operator (at index 5) +-- Result = 2001 + +print(eval "1+(") +-- Syntactic errors found: 2 +-- syntax error: expected an expression (at index 3) +-- syntax error: missing a closing ')' after the expression (at index 3) +-- Result = 1001 + +print(eval "3)") +-- Syntactic errors found: 1 +-- syntax error: extra characters found after the expression (at index 2) +-- Result = 3 +``` diff --git a/06/lpeglabel/examples/expRec.lua b/06/lpeglabel/examples/expRec.lua new file mode 100644 index 0000000..52bd40a --- /dev/null +++ b/06/lpeglabel/examples/expRec.lua @@ -0,0 +1,128 @@ +local m = require"lpeglabel" +local re = require"relabel" + +local labels = { + {"ExpTermFirst", "expected an expression"}, + {"ExpTermOp", "expected a term after the operator"}, + {"MisClose", "missing a closing ')' after the expression"}, +} + +local function labelindex(labname) + for i, elem in ipairs(labels) do + if elem[1] == labname then + return i + end + end + error("could not find label: " .. labname) +end + +local errors, subject + +local function expect(patt, labname) + local i = labelindex(labname) + return patt + m.T(i) +end + + +local num = m.R("09")^1 / tonumber +local op = m.S("+-") + +local function compute(tokens) + local result = tokens[1] + for i = 2, #tokens, 2 do + if tokens[i] == '+' then + result = result + tokens[i+1] + elseif tokens[i] == '-' then + result = result - tokens[i+1] + else + error('unknown operation: ' .. tokens[i]) + end + end + return result +end + +local g = m.P { + "Exp", + Exp = m.Ct(m.V"OperandFirst" * (m.C(op) * m.V"Operand")^0) / compute, + OperandFirst = expect(m.V"Term", "ExpTermFirst"), + Operand = expect(m.V"Term", "ExpTermOp"), + Term = num + m.V"Group", + Group = "(" * m.V"Exp" * expect(")", "MisClose"), +} + +function recorderror(pos, lab) + local line, col = re.calcline(subject, pos) + table.insert(errors, { line = line, col = col, msg = labels[lab][2] }) +end + +function record (labname) + return (m.Cp() * m.Cc(labelindex(labname))) / recorderror +end + +function sync (p) + return (-p * m.P(1))^0 +end + +function defaultValue (p) + return p or m.Cc(1000) +end + +local grec = m.P { + "S", + S = m.Rec(m.V"A", m.V"ErrExpTermFirst", labelindex("ExpTermFirst")), -- default value is 0 + A = m.Rec(m.V"Sg", m.V"ErrExpTermOp", labelindex("ExpTermOp")), + Sg = m.Rec(g, m.V"ErrMisClose", labelindex("MisClose")), + ErrExpTermFirst = record("ExpTermFirst") * sync(op + ")") * defaultValue(), + ErrExpTermOp = record("ExpTermOp") * sync(op + ")") * defaultValue(), + ErrMisClose = record("MisClose") * sync(m.P")") * defaultValue(m.P""), +} + +local function eval(input) + errors = {} + io.write("Input: ", input, "\n") + subject = input + local result, label, suffix = grec:match(input) + io.write("Syntactic errors found: " .. #errors, "\n") + if #errors > 0 then + local out = {} + for i, err in ipairs(errors) do + local pos = err.col + local msg = err.msg + table.insert(out, "syntax error: " .. msg .. " (at index " .. pos .. ")") + end + print(table.concat(out, "\n")) + end + io.write("Result = ") + return result +end + +print(eval "90-70-(5)+3") +--> 20 + +print(eval "15+") +--> 2 + 0 + +print(eval "-2") +--> 0 - 2 + +print(eval "1+3+-9") +--> 1 + 3 + [0] - 9 + +print(eval "1+()3+") +--> 1 + ([0]) [3 +] [0] + +print(eval "8-(2+)-5") +--> 8 - (2 + [0]) - 5 + +print(eval "()") + +print(eval "") + +print(eval "1+()+") + +print(eval "1+(") + +print(eval "3)") + +print(eval "11+())3") + diff --git a/06/lpeglabel/examples/expRecAut.lua b/06/lpeglabel/examples/expRecAut.lua new file mode 100644 index 0000000..b8280a7 --- /dev/null +++ b/06/lpeglabel/examples/expRecAut.lua @@ -0,0 +1,122 @@ +local m = require"lpeglabel" +local re = require"relabel" + +local num = m.R("09")^1 / tonumber +local op = m.S("+-") + +local labels = {} +local nlabels = 0 + +local function newError(lab, msg, psync, pcap) + nlabels = nlabels + 1 + psync = psync or m.P(-1) + pcap = pcap or m.P"" + labels[lab] = { id = nlabels, msg = msg, psync = psync, pcap = pcap } +end + +newError("ExpTermFirst", "expected an expression", op + ")", m.Cc(1000)) +newError("ExpTermOp", "expected a term after the operator", op + ")", m.Cc(1000)) +newError("MisClose", "missing a closing ')' after the expression", m.P")") +newError("Extra", "extra characters found after the expression") + +local errors, subject + +local function expect(patt, labname) + local i = labels[labname].id + return patt + m.T(i) +end + +local function compute(tokens) + local result = tokens[1] + for i = 2, #tokens, 2 do + if tokens[i] == '+' then + result = result + tokens[i+1] + elseif tokens[i] == '-' then + result = result - tokens[i+1] + else + error('unknown operation: ' .. tokens[i]) + end + end + return result +end + +local g = m.P { + "Exp", + Exp = m.Ct(m.V"OperandFirst" * (m.C(op) * m.V"Operand")^0) / compute, + OperandFirst = expect(m.V"Term", "ExpTermFirst"), + Operand = expect(m.V"Term", "ExpTermOp"), + Term = num + m.V"Group", + Group = "(" * m.V"Exp" * expect(")", "MisClose"), +} + +function recorderror(pos, lab) + local line, col = re.calcline(subject, pos) + table.insert(errors, { line = line, col = col, msg = labels[lab].msg }) +end + +function record (labname) + return (m.Cp() * m.Cc(labname)) / recorderror +end + +function sync (p) + return (-p * m.P(1))^0 +end + +function defaultValue (p) + return p or m.Cc(1000) +end + +local grec = g * expect(m.P(-1), "Extra") +for k, v in pairs(labels) do + grec = m.Rec(grec, record(k) * sync(v.psync) * v.pcap, v.id) +end + +local function eval(input) + errors = {} + io.write("Input: ", input, "\n") + subject = input + local result, label, suffix = grec:match(input) + io.write("Syntactic errors found: " .. #errors, "\n") + if #errors > 0 then + local out = {} + for i, err in ipairs(errors) do + local pos = err.col + local msg = err.msg + table.insert(out, "syntax error: " .. msg .. " (at index " .. pos .. ")") + end + print(table.concat(out, "\n")) + end + io.write("Result = ") + return result +end + +print(eval "90-70-(5)+3") +--> 18 + +print(eval "15+") +--> 2 + 0 + +print(eval "-2") +--> 0 - 2 + +print(eval "1+3+-9") +--> 1 + 3 + [0] - 9 + +print(eval "1+()3+") +--> 1 + ([0]) [+] 3 + [0] + +print(eval "8-(2+)-5") +--> 8 - (2 + [0]) - 5 + +print(eval "()") + +print(eval "") + +print(eval "1+()+") + +print(eval "1+(") + +print(eval "3)") + +print(eval "11+()3") +--> 1 + ([0]) [+] 3 + [0] diff --git a/06/lpeglabel/examples/farthest.lua b/06/lpeglabel/examples/farthest.lua new file mode 100644 index 0000000..692390f --- /dev/null +++ b/06/lpeglabel/examples/farthest.lua @@ -0,0 +1,14 @@ +local m = require'lpeglabel' + +function matchPrint(p, s) + local r, lab, sfail = p:match(s) + print("r: ", r, "lab: ", lab, "sfail: ", sfail) +end + +local p = m.P"a"^0 * m.P"b" + m.P"c" +matchPrint(p, "abc") --> r: 3 lab: nil sfail: nil +matchPrint(p, "c") --> r: 2 lab: nil sfail: nil +matchPrint(p, "aac") --> r: nil lab: 0 sfail: c +matchPrint(p, "xxc") --> r: nil lab: 0 sfail: xxc + + diff --git a/06/lpeglabel/examples/listId1.lua b/06/lpeglabel/examples/listId1.lua new file mode 100644 index 0000000..b7943c1 --- /dev/null +++ b/06/lpeglabel/examples/listId1.lua @@ -0,0 +1,33 @@ +local m = require'lpeglabel' +local re = require'relabel' + +local id = m.R'az'^1 + +local g = m.P{ + "S", + S = m.V"Id" * m.V"List", + List = -m.P(1) + m.V"Comma" * m.V"Id" * m.V"List", + Id = m.V"Sp" * id + m.T(1), + Comma = m.V"Sp" * "," + m.T(2), + Sp = m.S" \n\t"^0, +} + +function mymatch (g, s) + local r, e, sfail = g:match(s) + if not r then + local line, col = re.calcline(s, #s - #sfail) + local msg = "Error at line " .. line .. " (col " .. col .. ")" + if e == 1 then + return r, msg .. ": expecting an identifier before '" .. sfail .. "'" + elseif e == 2 then + return r, msg .. ": expecting ',' before '" .. sfail .. "'" + else + return r, msg + end + end + return r +end + +print(mymatch(g, "one,two")) +print(mymatch(g, "one two")) +print(mymatch(g, "one,\n two,\nthree,")) diff --git a/06/lpeglabel/examples/listId2.lua b/06/lpeglabel/examples/listId2.lua new file mode 100644 index 0000000..3ee89da --- /dev/null +++ b/06/lpeglabel/examples/listId2.lua @@ -0,0 +1,39 @@ +local m = require'lpeglabel' +local re = require'relabel' + +local terror = {} + +local function newError(s) + table.insert(terror, s) + return #terror +end + +local errUndef = newError("undefined") +local errId = newError("expecting an identifier") +local errComma = newError("expecting ','") + +local id = m.R'az'^1 + +local g = m.P{ + "S", + S = m.V"Id" * m.V"List", + List = -m.P(1) + m.V"Comma" * m.V"Id" * m.V"List", + Id = m.V"Sp" * id + m.T(errId), + Comma = m.V"Sp" * "," + m.T(errComma), + Sp = m.S" \n\t"^0, +} + + +function mymatch (g, s) + local r, e, sfail = g:match(s) + if not r then + local line, col = re.calcline(s, #s - #sfail) + local msg = "Error at line " .. line .. " (col " .. col .. "): " + return r, msg .. terror[e] .. " before '" .. sfail .. "'" + end + return r +end + +print(mymatch(g, "one,two")) +print(mymatch(g, "one two")) +print(mymatch(g, "one,\n two,\nthree,")) diff --git a/06/lpeglabel/examples/listId2Rec2.lua b/06/lpeglabel/examples/listId2Rec2.lua new file mode 100644 index 0000000..3506095 --- /dev/null +++ b/06/lpeglabel/examples/listId2Rec2.lua @@ -0,0 +1,67 @@ +local m = require'lpeglabel' +local re = require'relabel' + +local terror = {} + +local function newError(s) + table.insert(terror, s) + return #terror +end + +local errUndef = newError("undefined") +local errId = newError("expecting an identifier") +local errComma = newError("expecting ','") + +local id = m.R'az'^1 + +local g = m.P{ + "S", + S = m.V"Id" * m.V"List", + List = -m.P(1) + m.V"Comma" * m.V"Id" * m.V"List", + Id = m.V"Sp" * id + m.T(errId), + Comma = m.V"Sp" * "," + m.T(errComma), + Sp = m.S" \n\t"^0, +} + +local subject, errors + +function recorderror(pos, lab) + local line, col = re.calcline(subject, pos) + table.insert(errors, { line = line, col = col, msg = terror[lab] }) +end + +function record (lab) + return (m.Cp() * m.Cc(lab)) / recorderror +end + +function sync (p) + return (-p * m.P(1))^0 +end + +local grec = m.P{ + "S", + S = m.Rec(m.Rec(g, m.V"ErrComma", errComma), m.V"ErrId", errId), + ErrComma = record(errComma) * sync(id), + ErrId = record(errId) * sync(m.P",") +} + + +function mymatch (g, s) + errors = {} + subject = s + local r, e, sfail = g:match(s) + if #errors > 0 then + local out = {} + for i, err in ipairs(errors) do + local msg = "Error at line " .. err.line .. " (col " .. err.col .. "): " .. err.msg + table.insert(out, msg) + end + return nil, table.concat(out, "\n") .. "\n" + end + return r +end + +print(mymatch(grec, "one,two")) +print(mymatch(grec, "one two three")) +print(mymatch(grec, "1,\n two, \n3,")) +print(mymatch(grec, "one\n two123, \nthree,")) diff --git a/06/lpeglabel/examples/listId2Rec2Cap.lua b/06/lpeglabel/examples/listId2Rec2Cap.lua new file mode 100644 index 0000000..32a4113 --- /dev/null +++ b/06/lpeglabel/examples/listId2Rec2Cap.lua @@ -0,0 +1,79 @@ +local m = require'lpeglabel' +local re = require'relabel' + +local terror = {} + +local function newError(s) + table.insert(terror, s) + return #terror +end + +local errUndef = newError("undefined") +local errId = newError("expecting an identifier") +local errComma = newError("expecting ','") + +local id = m.R'az'^1 + +local g = m.P{ + "S", + S = m.V"Id" * m.V"List", + List = -m.P(1) + m.V"Comma" * m.V"Id" * m.V"List", + Id = m.V"Sp" * m.C(id) + m.T(errId), + Comma = m.V"Sp" * "," + m.T(errComma), + Sp = m.S" \n\t"^0, +} + +local subject, errors + +function recorderror(pos, lab) + local line, col = re.calcline(subject, pos) + table.insert(errors, { line = line, col = col, msg = terror[lab] }) +end + +function record (lab) + return (m.Cp() * m.Cc(lab)) / recorderror +end + +function sync (p) + return (-p * m.P(1))^0 +end + +function defaultValue () + return m.Cc"NONE" +end + +local grec = m.P{ + "S", + S = m.Rec(m.Rec(g, m.V"ErrComma", errComma), m.V"ErrId", errId), + ErrComma = record(errComma) * sync(id), + ErrId = record(errId) * sync(m.P",") * defaultValue(), +} + + +function mymatch (g, s) + errors = {} + subject = s + io.write("Input: ", s, "\n") + local r = { g:match(s) } + io.write("Captures (separated by ';'): ") + for k, v in pairs(r) do + io.write(v .. "; ") + end + io.write("\nSyntactic errors found: " .. #errors) + if #errors > 0 then + io.write("\n") + local out = {} + for i, err in ipairs(errors) do + local msg = "Error at line " .. err.line .. " (col " .. err.col .. "): " .. err.msg + table.insert(out, msg) + end + io.write(table.concat(out, "\n")) + end + print("\n") + return r +end + +mymatch(grec, "one,two") +mymatch(grec, "one two three") +mymatch(grec, "1,\n two, \n3,") +mymatch(grec, "one\n two123, \nthree,") diff --git a/06/lpeglabel/examples/listIdRe1.lua b/06/lpeglabel/examples/listIdRe1.lua new file mode 100644 index 0000000..3098c66 --- /dev/null +++ b/06/lpeglabel/examples/listIdRe1.lua @@ -0,0 +1,30 @@ +local re = require 'relabel' + +local g = re.compile[[ + S <- Id List + List <- !. / Comma Id List + Id <- Sp [a-z]+ / %{2} + Comma <- Sp ',' / %{3} + Sp <- %s* +]] + +function mymatch (g, s) + local r, e, sfail = g:match(s) + if not r then + local line, col = re.calcline(s, #s - #sfail) + local msg = "Error at line " .. line .. " (col " .. col .. ")" + if e == 1 then + return r, msg .. ": expecting an identifier before '" .. sfail .. "'" + elseif e == 2 then + return r, msg .. ": expecting ',' before '" .. sfail .. "'" + else + return r, msg + end + end + return r +end + +print(mymatch(g, "one,two")) +print(mymatch(g, "one two")) +print(mymatch(g, "one,\n two,\nthree,")) + diff --git a/06/lpeglabel/examples/listIdRe2.lua b/06/lpeglabel/examples/listIdRe2.lua new file mode 100644 index 0000000..58ddedd --- /dev/null +++ b/06/lpeglabel/examples/listIdRe2.lua @@ -0,0 +1,71 @@ +local re = require 'relabel' + +local errinfo = { + {"errUndef", "undefined"}, + {"errId", "expecting an identifier"}, + {"errComma", "expecting ','"}, +} + +local errmsgs = {} +local labels = {} + +for i, err in ipairs(errinfo) do + errmsgs[i] = err[2] + labels[err[1]] = i +end + +re.setlabels(labels) + +local g = re.compile[[ + S <- Id List + List <- !. / Comma Id List + Id <- Sp {[a-z]+} / %{errId} + Comma <- Sp ',' / %{errComma} + Sp <- %s* +]] + +local errors + +function recorderror (subject, pos, label) + local line, col = re.calcline(subject, pos) + table.insert(errors, { line = line, col = col, msg = errmsgs[labels[label]] }) + return true +end + +function sync (p) + return '( !(' .. p .. ') .)*' +end + +local grec = re.compile( + "S <- %g //{errComma} ErrComma //{errId} ErrId" .. "\n" .. + "ErrComma <- ('' -> 'errComma' => recorderror) " .. sync('[a-z]+') .. "\n" .. + "ErrId <- ('' -> 'errId' => recorderror) " .. sync('","') .. "-> default" + , {g = g, recorderror = recorderror, default = "NONE"}) + +function mymatch (g, s) + errors = {} + subject = s + io.write("Input: ", s, "\n") + local r = { g:match(s) } + io.write("Captures (separated by ';'): ") + for k, v in pairs(r) do + io.write(v .. "; ") + end + io.write("\nSyntactic errors found: " .. #errors) + if #errors > 0 then + io.write("\n") + local out = {} + for i, err in ipairs(errors) do + local msg = "Error at line " .. err.line .. " (col " .. err.col .. "): " .. err.msg + table.insert(out, msg) + end + io.write(table.concat(out, "\n")) + end + print("\n") + return r +end + +mymatch(grec, "one,two") +mymatch(grec, "one two three") +mymatch(grec, "1,\n two, \n3,") +mymatch(grec, "one\n two123, \nthree,") diff --git a/06/lpeglabel/examples/tiny.lua b/06/lpeglabel/examples/tiny.lua new file mode 100644 index 0000000..734536c --- /dev/null +++ b/06/lpeglabel/examples/tiny.lua @@ -0,0 +1,151 @@ +local re = require 'relabel' + +local terror = {} + +local function newError(l, msg) + table.insert(terror, { l = l, msg = msg} ) +end + +newError("errSemi", "Error: missing ';'") +newError("errExpIf", "Error: expected expression after 'if'") +newError("errThen", "Error: expected 'then' keyword") +newError("errCmdSeq1", "Error: expected at least a command after 'then'") +newError("errCmdSeq2", "Error: expected at least a command after 'else'") +newError("errEnd", "Error: expected 'end' keyword") +newError("errCmdSeqRep", "Error: expected at least a command after 'repeat'") +newError("errUntil", "Error: expected 'until' keyword") +newError("errExpRep", "Error: expected expression after 'until'") +newError("errAssignOp", "Error: expected ':=' in assigment") +newError("errExpAssign", "Error: expected expression after ':='") +newError("errReadName", "Error: expected an identifier after 'read'") +newError("errWriteExp", "Error: expected expression after 'write'") +newError("errSimpExp", "Error: expected '(', ID, or number after '<' or '='") +newError("errTerm", "Error: expected '(', ID, or number after '+' or '-'") +newError("errFactor", "Error: expected '(', ID, or number after '*' or '/'") +newError("errExpFac", "Error: expected expression after '('") +newError("errClosePar", "Error: expected ')' after expression") + + +local labelCode = {} +for k, v in ipairs(terror) do + labelCode[v.l] = k +end + +re.setlabels(labelCode) + +local g = re.compile[[ + Tiny <- CmdSeq + CmdSeq <- (Cmd (SEMICOLON / ErrSemi)) (Cmd (SEMICOLON / ErrSemi))* + Cmd <- IfCmd / RepeatCmd / ReadCmd / WriteCmd / AssignCmd + IfCmd <- IF (Exp / ErrExpIf) (THEN / ErrThen) (CmdSeq / ErrCmdSeq1) (ELSE (CmdSeq / ErrCmdSeq2) / '') (END / ErrEnd) + RepeatCmd <- REPEAT (CmdSeq / ErrCmdSeqRep) (UNTIL / ErrUntil) (Exp / ErrExpRep) + AssignCmd <- NAME (ASSIGNMENT / ErrAssignOp) (Exp / ErrExpAssign) + ReadCmd <- READ (NAME / ErrReadName) + WriteCmd <- WRITE (Exp / ErrWriteExp) + Exp <- SimpleExp ((LESS / EQUAL) (SimpleExp / ErrSimpExp) / '') + SimpleExp <- Term ((ADD / SUB) (Term / ErrTerm))* + Term <- Factor ((MUL / DIV) (Factor / ErrFactor))* + Factor <- OPENPAR (Exp / ErrExpFac) (CLOSEPAR / ErrClosePar) / NUMBER / NAME + ErrSemi <- %{errSemi} + ErrExpIf <- %{errExpIf} + ErrThen <- %{errThen} + ErrCmdSeq1 <- %{errCmdSeq1} + ErrCmdSeq2 <- %{errCmdSeq2} + ErrEnd <- %{errEnd} + ErrCmdSeqRep <- %{errCmdSeqRep} + ErrUntil <- %{errUntil} + ErrExpRep <- %{errExpRep} + ErrAssignOp <- %{errAssignOp} + ErrExpAssign <- %{errExpAssign} + ErrReadName <- %{errReadName} + ErrWriteExp <- %{errWriteExp} + ErrSimpExp <- %{errSimpExp} + ErrTerm <- %{errTerm} + ErrFactor <- %{errFactor} + ErrExpFac <- %{errExpFac} + ErrClosePar <- %{errClosePar} + ADD <- Sp '+' + ASSIGNMENT <- Sp ':=' + CLOSEPAR <- Sp ')' + DIV <- Sp '/' + IF <- Sp 'if' + ELSE <- Sp 'else' + END <- Sp 'end' + EQUAL <- Sp '=' + LESS <- Sp '<' + MUL <- Sp '*' + NAME <- Sp !RESERVED [a-z]+ + NUMBER <- Sp [0-9]+ + OPENPAR <- Sp '(' + READ <- Sp 'read' + REPEAT <- Sp 'repeat' + SEMICOLON <- Sp ';' + SUB <- Sp '-' + THEN <- Sp 'then' + UNTIL <- Sp 'until' + WRITE <- Sp 'write' + RESERVED <- (IF / ELSE / END / READ / REPEAT / THEN / UNTIL / WRITE) ![a-z]+ + Sp <- %s* +]] + + +local function mymatch(g, s) + local r, e, sfail = g:match(s) + if not r then + local line, col = re.calcline(s, #s - #sfail) + local msg = "Error at line " .. line .. " (col " .. col .. "): " + return r, msg .. terror[e].msg + end + return r +end + +local s = [[ +n := 5; +f := 1; +repeat + f := f + n; + n := n - 1 +until (n < 1); +write f;]] +print(mymatch(g, s)) + +s = [[ +n := 5; +f := 1; +repeat + f := f + n; + n := n - 1; +until (n < 1); +read ;]] +print(mymatch(g, s)) + +s = [[ +if a < 1 then + b := 2; +else + b := 3;]] +print(mymatch(g, s)) + +s = [[ +n := 5; +f := 1; +repeat + f := f + n; + n := n - 1; +untill (n < 1); +]] +print(mymatch(g, s)) + +s = [[ +n := 5; +f := 1; +repeat + f := f + n; + n := n - 1; +3 (n < 1); +]] +print(mymatch(g, s)) + +print(mymatch(g, "a : 2")) +print(mymatch(g, "a := (2")) + diff --git a/06/lpeglabel/examples/typedlua/test.lua b/06/lpeglabel/examples/typedlua/test.lua new file mode 100755 index 0000000..95474ba --- /dev/null +++ b/06/lpeglabel/examples/typedlua/test.lua @@ -0,0 +1,2572 @@ +#!/usr/bin/env lua + +local tlparser = require "tlparser" + +-- expected result, result, message, subject +local e, r, m, s + +local filename = "test.lua" + +local function parse (s) + local r, m = tlparser.parse(s,filename,false,false) + if not r then m = m .. "\n" end + return r, m +end + +print("> testing lexer...") + +-- syntax ok + +-- empty files + +s = [=[ +]=] +--[=[ +{ } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +-- testing empty file +]=] +--[=[ +{ } +]=] + +r, m = parse(s) +assert(r == true) + +-- expressions + +s = [=[ +local _nil,_false,_true,_dots = nil,false,true,... +]=] +--[=[ +{ `Local{ { `Id "_nil", `Id "_false", `Id "_true", `Id "_dots" }, { `Nil, `False, `True, `Dots } } } +]=] + +r, m = parse(s) +assert(r == true) + +-- floating points + +s = [=[ +local f1 = 1. +local f2 = 1.1 +]=] +--[=[ +{ `Local{ { `Id "f1" }, { `Number "1.0" } }, `Local{ { `Id "f2" }, { `Number "1.1" } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local f1 = 1.e-1 +local f2 = 1.e1 +]=] +--[=[ +{ `Local{ { `Id "f1" }, { `Number "0.1" } }, `Local{ { `Id "f2" }, { `Number "10.0" } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local f1 = 1.1e+1 +local f2 = 1.1e1 +]=] +--[=[ +{ `Local{ { `Id "f1" }, { `Number "11.0" } }, `Local{ { `Id "f2" }, { `Number "11.0" } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local f1 = .1 +local f2 = .1e1 +]=] +--[=[ +{ `Local{ { `Id "f1" }, { `Number "0.1" } }, `Local{ { `Id "f2" }, { `Number "1.0" } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local f1 = 1E1 +local f2 = 1e-1 +]=] +--[=[ +{ `Local{ { `Id "f1" }, { `Number "10.0" } }, `Local{ { `Id "f2" }, { `Number "0.1" } } } +]=] + +r, m = parse(s) +assert(r == true) + +-- integers + +s = [=[ +local i = 1 +local h = 0xff +]=] +--[=[ +{ `Local{ { `Id "i" }, { `Number "1" } }, `Local{ { `Id "h" }, { `Number "255" } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local h = 0x76c +local i = 4294967296 -- 2^32 +]=] +--[=[ +{ `Local{ { `Id "h" }, { `Number "1900" } }, `Local{ { `Id "i" }, { `Number "4294967296" } } } +]=] + +r, m = parse(s) +assert(r == true) + +-- long comments + +s = [=[ +--[======[ +testing +long +comment +[==[ one ]==] +[===[ more ]===] +[====[ time ]====] +bye +]======] +]=] +--[=[ +{ } +]=] + +r, m = parse(s) +assert(r == true) + +-- long strings + +s = [=[ +--[[ +testing long string1 begin +]] + +local ls1 = +[[ +testing long string +]] + +--[[ +testing long string1 end +]] +]=] +--[=[ +{ `Local{ { `Id "ls1" }, { `String "testing long string\n" } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +--[==[ +testing long string2 begin +]==] + +local ls2 = [==[ testing \n [[ long ]] \t [===[ string ]===] +\a ]==] + +--[==[ +[[ testing long string2 end ]] +]==] +]=] +--[=[ +{ `Local{ { `Id "ls2" }, { `String " testing \\n [[ long ]] \\t [===[ string ]===]\n\\a " } } } +]=] + +r, m = parse(s) +assert(r == true) + +-- short strings + +s = [=[ +-- short string test begin + +local ss1_a = "ola mundo\a" +local ss1_b = 'ola mundo\a' + +-- short string test end +]=] +--[=[ +{ `Local{ { `Id "ss1_a" }, { `String "ola mundo\a" } }, `Local{ { `Id "ss1_b" }, { `String "ola mundo\a" } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +-- short string test begin + +local ss2_a = "testando,\tteste\n1\n2\n3 --> \"tchau\"" +local ss2_b = 'testando,\tteste\n1\n2\n3 --> \'tchau\'' + +-- short string test end +]=] +--[=[ +{ `Local{ { `Id "ss2_a" }, { `String "testando,\tteste\n1\n2\n3 --> \"tchau\"" } }, `Local{ { `Id "ss2_b" }, { `String "testando,\tteste\n1\n2\n3 --> 'tchau'" } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +-- short string test begin + +local ss3_a = "ola \ +'mundo'!" + +local ss3_b = 'ola \ +"mundo"!' + +-- short string test end +]=] +--[=[ +{ `Local{ { `Id "ss3_a" }, { `String "ola \n'mundo'!" } }, `Local{ { `Id "ss3_b" }, { `String "ola \n\"mundo\"!" } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +-- short string test begin + +local ss4_a = "C:\\Temp/" + +local ss4_b = 'C:\\Temp/' + +-- short string test end +]=] +--[=[ +{ `Local{ { `Id "ss4_a" }, { `String "C:\\Temp/" } }, `Local{ { `Id "ss4_b" }, { `String "C:\\Temp/" } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +-- short string test begin + +local ss5_a = "ola \ +mundo \\ \ +cruel" + +local ss5_b = 'ola \ +mundo \\ \ +cruel' + +-- short string test end +]=] +--[=[ +{ `Local{ { `Id "ss5_a" }, { `String "ola \nmundo \\ \ncruel" } }, `Local{ { `Id "ss5_b" }, { `String "ola \nmundo \\ \ncruel" } } } +]=] + +r, m = parse(s) +assert(r == true) + +-- syntax error + +-- floating points + +s = [=[ +local f = 9e +]=] +--[=[ +test.lua:2:1: syntax error, unexpected 'EOF', expecting '=', ',', 'String', '{', '(', ':', '[', '.' +]=] +e = [=[ +test.lua:1:12: malformed +]=] + +r, m = parse(s) +assert(m == e) + +s = [=[ +local f = 5.e +]=] +--[=[ +test.lua:2:1: syntax error, unexpected 'EOF', expecting '=', ',', 'String', '{', '(', ':', '[', '.' +]=] +e = [=[ +test.lua:1:13: malformed +]=] + +r, m = parse(s) +assert(m == e) + +s = [=[ +local f = .9e- +]=] +--[=[ +test.lua:1:14: syntax error, unexpected '-', expecting '=', ',', 'String', '{', '(', ':', '[', '.' +]=] +e = [=[ +test.lua:1:14: malformed +]=] + +r, m = parse(s) +assert(m == e) + +s = [=[ +local f = 5.9e+ +]=] +--[=[ +test.lua:1:15: syntax error, unexpected '+', expecting '=', ',', 'String', '{', '(', ':', '[', '.' +]=] +e = [=[ +test.lua:1:15: malformed +]=] + +r, m = parse(s) +assert(m == e) + +-- integers + +s = [=[ +-- invalid hexadecimal number + +local hex = 0xG +]=] +--[=[ +test.lua:4:1: syntax error, unexpected 'EOF', expecting '=', ',', 'String', '{', '(', ':', '[', '.' +]=] +e = [=[ +test.lua:3:14: malformed +]=] + +r, m = parse(s) +assert(m == e) + +-- long strings + +s = [=[ +--[==[ +testing long string3 begin +]==] + +local ls3 = [===[ +testing +unfinised +long string +]==] + +--[==[ +[[ testing long string3 end ]] +]==] +]=] +--[=[ +test.lua:5:13: syntax error, unexpected '[', expecting '(', 'Name', '{', 'function', '...', 'true', 'false', 'nil', 'String', 'Number', '#', '~', '-', 'not' +]=] +e = [=[ +test.lua:14:1: unfinished long string +]=] + +r, m = parse(s) +assert(m == e) + +-- short strings + +s = [=[ +-- short string test begin + +local ss6 = "testing unfinished string + +-- short string test end +]=] +--[=[ +test.lua:3:13: syntax error, unexpected '"', expecting '(', 'Name', '{', 'function', '...', 'true', 'false', 'nil', 'String', 'Number', '#', '~', '-', 'not' +]=] +e = [=[ +test.lua:6:1: malformed +]=] + +r, m = parse(s) +assert(m == e) + +-- unfinished comments + +s = [=[ +--[[ + +testing +unfinished + +comment + ]=] +--[=[ +test.lua:3:1: syntax error, unexpected 'comment', expecting '=', ',', 'String', '{', '(', ':', '[', '.' +]=] +e = [=[ +test.lua:1:2: unfinished long comment +]=] + +r, m = parse(s) +assert(m == e) + +print("> testing parser...") + +-- syntax ok + +-- anonymous functions + +s = [=[ +local a,b,c = function () end +]=] +--[=[ +{ `Local{ { `Id "a", `Id "b", `Id "c" }, { `Function{ { }, { } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local test = function ( a , b , ... ) end +]=] +--[=[ +{ `Local{ { `Id "test" }, { `Function{ { `Id "a", `Id "b", `Dots }, { } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local test = function (...) return ...,0 end +]=] +--[=[ +{ `Local{ { `Id "test" }, { `Function{ { `Dots }, { `Return{ `Dots, `Number "0" } } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +-- arithmetic expressions + +s = [=[ +local arithmetic = 1 - 2 * 3 + 4 +]=] +--[=[ +{ `Local{ { `Id "arithmetic" }, { `Op{ "add", `Op{ "sub", `Number "1", `Op{ "mul", `Number "2", `Number "3" } }, `Number "4" } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local pow = -3^-2^2 +]=] +--[=[ +{ `Local{ { `Id "pow" }, { `Op{ "unm", `Op{ "pow", `Number "3", `Op{ "unm", `Op{ "pow", `Number "2", `Number "2" } } } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +q, r, f = 3//2, 3%2, 3/2 +]=] +--[=[ +{ `Set{ { `Index{ `Id "_ENV", `String "q" }, `Index{ `Id "_ENV", `String "r" }, `Index{ `Id "_ENV", `String "f" } }, { `Op{ "idiv", `Number "3", `Number "2" }, `Op{ "mod", `Number "3", `Number "2" }, `Op{ "div", `Number "3", `Number "2" } } } } +]=] + +r, m = parse(s) +assert(r == true) + +-- assignments + +s = [=[ +a = f()[1] +]=] +--[=[ +{ `Set{ { `Index{ `Id "_ENV", `String "a" } }, { `Index{ `Call{ `Index{ `Id "_ENV", `String "f" } }, `Number "1" } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +a()[1] = 1; +]=] +--[=[ +{ `Set{ { `Index{ `Call{ `Index{ `Id "_ENV", `String "a" } }, `Number "1" } }, { `Number "1" } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +i = a.f(1) +]=] +--[=[ +{ `Set{ { `Index{ `Id "_ENV", `String "i" } }, { `Call{ `Index{ `Index{ `Id "_ENV", `String "a" }, `String "f" }, `Number "1" } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +i = a[f(1)] +]=] +--[=[ +{ `Set{ { `Index{ `Id "_ENV", `String "i" } }, { `Index{ `Index{ `Id "_ENV", `String "a" }, `Call{ `Index{ `Id "_ENV", `String "f" }, `Number "1" } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +a[f()] = sub +i = i + 1 +]=] +--[=[ +{ `Set{ { `Index{ `Index{ `Id "_ENV", `String "a" }, `Call{ `Index{ `Id "_ENV", `String "f" } } } }, { `Index{ `Id "_ENV", `String "sub" } } }, `Set{ { `Index{ `Id "_ENV", `String "i" } }, { `Op{ "add", `Index{ `Id "_ENV", `String "i" }, `Number "1" } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +a:b(1)._ = some_value +]=] +--[=[ +{ `Set{ { `Index{ `Invoke{ `Index{ `Id "_ENV", `String "a" }, `String "b", `Number "1" }, `String "_" } }, { `Index{ `Id "_ENV", `String "some_value" } } } } +]=] + +r, m = parse(s) +assert(r == true) + +-- bitwise expressions + +s = [=[ +b = 1 & 0 | 1 ~ 1 +]=] +--[=[ +{ `Set{ { `Index{ `Id "_ENV", `String "b" } }, { `Op{ "bor", `Op{ "band", `Number "1", `Number "0" }, `Op{ "bxor", `Number "1", `Number "1" } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +b = 1 & 0 | 1 >> 1 ~ 1 +]=] +--[=[ +{ `Set{ { `Index{ `Id "_ENV", `String "b" } }, { `Op{ "bor", `Op{ "band", `Number "1", `Number "0" }, `Op{ "bxor", `Op{ "shr", `Number "1", `Number "1" }, `Number "1" } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +-- break + +s = [=[ +while 1 do + break +end +]=] +--[=[ +{ `While{ `Number "1", { `Break } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +while 1 do + while 1 do + break + end + break +end +]=] +--[=[ +{ `While{ `Number "1", { `While{ `Number "1", { `Break } }, `Break } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +repeat + if 2 > 1 then break end +until 1 +]=] +--[=[ +{ `Repeat{ { `If{ `Op{ "lt", `Number "1", `Number "2" }, { `Break } } }, `Number "1" } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +for i=1,10 do + do + break + break + return + end +end +]=] +--[=[ +{ `Fornum{ `Id "i", `Number "1", `Number "10", { `Do{ `Break, `Break, `Return } } } } +]=] + +r, m = parse(s) +assert(r == true) + +-- block statements + +s = [=[ +do + local var = 2+2; + return +end +]=] +--[=[ +{ `Do{ `Local{ { `Id "var" }, { `Op{ "add", `Number "2", `Number "2" } } }, `Return } } +]=] + +r, m = parse(s) +assert(r == true) + +-- calls + +s = [=[ +f() +t:m() +]=] +--[=[ +{ `Call{ `Index{ `Id "_ENV", `String "f" } }, `Invoke{ `Index{ `Id "_ENV", `String "t" }, `String "m" } } +]=] + +r, m = parse(s) +assert(r == true) + +-- concatenation expressions + +s = [=[ +local concat1 = 1 .. 2^3 +]=] +--[=[ +{ `Local{ { `Id "concat1" }, { `Op{ "concat", `Number "1", `Op{ "pow", `Number "2", `Number "3" } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +-- empty files + +s = [=[ +; +]=] +--[=[ +{ } +]=] + +r, m = parse(s) +assert(r == true) + +-- for generic + +s = [=[ +for k,v in pairs(t) do print (k,v) end +]=] +--[=[ +{ `Forin{ { `Id "k", `Id "v" }, { `Call{ `Index{ `Id "_ENV", `String "pairs" }, `Index{ `Id "_ENV", `String "t" } } }, { `Call{ `Index{ `Id "_ENV", `String "print" }, `Id "k", `Id "v" } } } } +]=] + +r, m = parse(s) +assert(r == true) + +-- for numeric + +s = [=[ +for i = 1 , 10 , 2 do end +]=] +--[=[ +{ `Fornum{ `Id "i", `Number "1", `Number "10", `Number "2", { } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +for i=1,10 do end +]=] +--[=[ +{ `Fornum{ `Id "i", `Number "1", `Number "10", { } } } +]=] + +r, m = parse(s) +assert(r == true) + +-- global functions + +s = [=[ +function test(a , b , ...) end +]=] +--[=[ +{ `Set{ { `Index{ `Id "_ENV", `String "test" } }, { `Function{ { `Id "a", `Id "b", `Dots }, { } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +function test (...) end +]=] +--[=[ +{ `Set{ { `Index{ `Id "_ENV", `String "test" } }, { `Function{ { `Dots }, { } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +function t.a:b() end +]=] +--[=[ +{ `Set{ { `Index{ `Index{ `Index{ `Id "_ENV", `String "t" }, `String "a" }, `String "b" } }, { `Function{ { `Id "self" }, { } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +function t.a() end +]=] +--[=[ +{ `Set{ { `Index{ `Index{ `Id "_ENV", `String "t" }, `String "a" } }, { `Function{ { }, { } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +function testando . funcao . com : espcacos ( e, com , parametros, ... ) end +]=] +--[=[ +{ `Set{ { `Index{ `Index{ `Index{ `Index{ `Id "_ENV", `String "testando" }, `String "funcao" }, `String "com" }, `String "espcacos" } }, { `Function{ { `Id "self", `Id "e", `Id "com", `Id "parametros", `Dots }, { } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +-- goto + +s = [=[ +goto label +:: label :: return +]=] +--[=[ +{ `Goto{ "label" }, `Label{ "label" }, `Return } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +::label:: +goto label +]=] +--[=[ +{ `Label{ "label" }, `Goto{ "label" } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +goto label +::label:: +]=] +--[=[ +{ `Goto{ "label" }, `Label{ "label" } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +::label:: +do ::label:: goto label end +]=] +--[=[ +{ `Label{ "label" }, `Do{ `Label{ "label" }, `Goto{ "label" } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +::label:: +do goto label ; ::label:: end +]=] +--[=[ +{ `Label{ "label" }, `Do{ `Goto{ "label" }, `Label{ "label" } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +::label:: +do goto label end +]=] +--[=[ +{ `Label{ "label" }, `Do{ `Goto{ "label" } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +do goto label end +::label:: +]=] +--[=[ +{ `Do{ `Goto{ "label" } }, `Label{ "label" } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +do do do do do goto label end end end end end +::label:: +]=] +--[=[ +{ `Do{ `Do{ `Do{ `Do{ `Do{ `Goto{ "label" } } } } } }, `Label{ "label" } } +]=] + +r, m = parse(s) +assert(r == true) + +-- if-else + +s = [=[ +if a then end +]=] +--[=[ +{ `If{ `Index{ `Id "_ENV", `String "a" }, { } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +if a then return a else return end +]=] +--[=[ +{ `If{ `Index{ `Id "_ENV", `String "a" }, { `Return{ `Index{ `Id "_ENV", `String "a" } } }, { `Return } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +if a then + return a +else + local c = d + d = d + 1 + return d +end +]=] +--[=[ +{ `If{ `Index{ `Id "_ENV", `String "a" }, { `Return{ `Index{ `Id "_ENV", `String "a" } } }, { `Local{ { `Id "c" }, { `Index{ `Id "_ENV", `String "d" } } }, `Set{ { `Index{ `Id "_ENV", `String "d" } }, { `Op{ "add", `Index{ `Id "_ENV", `String "d" }, `Number "1" } } }, `Return{ `Index{ `Id "_ENV", `String "d" } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +if a then + return a +elseif b then + return b +elseif c then + return c +end +]=] +--[=[ +{ `If{ `Index{ `Id "_ENV", `String "a" }, { `Return{ `Index{ `Id "_ENV", `String "a" } } }, `Index{ `Id "_ENV", `String "b" }, { `Return{ `Index{ `Id "_ENV", `String "b" } } }, `Index{ `Id "_ENV", `String "c" }, { `Return{ `Index{ `Id "_ENV", `String "c" } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +if a then return a +elseif b then return +else ; +end +]=] +--[=[ +{ `If{ `Index{ `Id "_ENV", `String "a" }, { `Return{ `Index{ `Id "_ENV", `String "a" } } }, `Index{ `Id "_ENV", `String "b" }, { `Return }, { } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +if a then + return +elseif c then +end +]=] +--[=[ +{ `If{ `Index{ `Id "_ENV", `String "a" }, { `Return }, `Index{ `Id "_ENV", `String "c" }, { } } } +]=] + +r, m = parse(s) +assert(r == true) + +-- interfaces + +s = [=[ +local interface Empty end +]=] +--[=[ +{ `Interface{ Empty, `TTable{ } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local interface X + x, y, z:number +end +]=] +--[=[ +{ `Interface{ X, `TTable{ `TLiteral x:`TBase number, `TLiteral y:`TBase number, `TLiteral z:`TBase number } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local interface Person + firstname:string + lastname:string +end +]=] +--[=[ +{ `Interface{ Person, `TTable{ `TLiteral firstname:`TBase string, `TLiteral lastname:`TBase string } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local interface Element + info:number + next:Element? +end +]=] +--[=[ +{ `Interface{ Element, `TRecursive{ Element, `TTable{ `TLiteral info:`TBase number, `TLiteral next:`TUnion{ `TVariable Element, `TNil } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +-- labels + +s = [=[ +::label:: +do ::label:: end +::other_label:: +]=] +--[=[ +{ `Label{ "label" }, `Do{ `Label{ "label" } }, `Label{ "other_label" } } +]=] + +r, m = parse(s) +assert(r == true) + +-- locals + +s = [=[ +local a +]=] +--[=[ +{ `Local{ { `Id "a" }, { } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local a,b,c +]=] +--[=[ +{ `Local{ { `Id "a", `Id "b", `Id "c" }, { } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local a = 1 , 1 + 2, 5.1 +]=] +--[=[ +{ `Local{ { `Id "a" }, { `Number "1", `Op{ "add", `Number "1", `Number "2" }, `Number "5.1" } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local a,b,c = 1.9 +]=] +--[=[ +{ `Local{ { `Id "a", `Id "b", `Id "c" }, { `Number "1.9" } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local function test() end +]=] +--[=[ +{ `Localrec{ { `Id "test" }, { `Function{ { }, { } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local function test ( a , b , c , ... ) end +]=] +--[=[ +{ `Localrec{ { `Id "test" }, { `Function{ { `Id "a", `Id "b", `Id "c", `Dots }, { } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local function test(...) return ... end +]=] +--[=[ +{ `Localrec{ { `Id "test" }, { `Function{ { `Dots }, { `Return{ `Dots } } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +-- relational expressions + +s = [=[ +local relational = 1 < 2 >= 3 == 4 ~= 5 < 6 <= 7 +]=] +--[=[ +{ `Local{ { `Id "relational" }, { `Op{ "le", `Op{ "lt", `Op{ "not", `Op{ "eq", `Op{ "eq", `Op{ "le", `Number "3", `Op{ "lt", `Number "1", `Number "2" } }, `Number "4" }, `Number "5" } }, `Number "6" }, `Number "7" } } } } +]=] + +r, m = parse(s) +assert(r == true) + +-- repeat + +s = [=[ +repeat + local a,b,c = 1+1,2+2,3+3 + break +until a < 1 +]=] +--[=[ +{ `Repeat{ { `Local{ { `Id "a", `Id "b", `Id "c" }, { `Op{ "add", `Number "1", `Number "1" }, `Op{ "add", `Number "2", `Number "2" }, `Op{ "add", `Number "3", `Number "3" } } }, `Break }, `Op{ "lt", `Index{ `Id "_ENV", `String "a" }, `Number "1" } } } +]=] + +r, m = parse(s) +assert(r == true) + +-- return + +s = [=[ +return +]=] +--[=[ +{ `Return } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +return 1 +]=] +--[=[ +{ `Return{ `Number "1" } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +return 1,1-2*3+4,"alo" +]=] +--[=[ +{ `Return{ `Number "1", `Op{ "add", `Op{ "sub", `Number "1", `Op{ "mul", `Number "2", `Number "3" } }, `Number "4" }, `String "alo" } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +return; +]=] +--[=[ +{ `Return } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +return 1; +]=] +--[=[ +{ `Return{ `Number "1" } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +return 1,1-2*3+4,"alo"; +]=] +--[=[ +{ `Return{ `Number "1", `Op{ "add", `Op{ "sub", `Number "1", `Op{ "mul", `Number "2", `Number "3" } }, `Number "4" }, `String "alo" } } +]=] + +r, m = parse(s) +assert(r == true) + +-- tables + +s = [=[ +local t = { [1] = "alo", alo = 1, 2; } +]=] +--[=[ +{ `Local{ { `Id "t" }, { `Table{ `Pair{ `Number "1", `String "alo" }, `Pair{ `String "alo", `Number "1" }, `Number "2" } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local t = { 1.5 } +]=] +--[=[ +{ `Local{ { `Id "t" }, { `Table{ `Number "1.5" } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local t = {1,2; +3, +4, + + + +5} +]=] +--[=[ +{ `Local{ { `Id "t" }, { `Table{ `Number "1", `Number "2", `Number "3", `Number "4", `Number "5" } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local t = {[1]=1,[2]=2; +[3]=3, +[4]=4, + + + +[5]=5} +]=] +--[=[ +{ `Local{ { `Id "t" }, { `Table{ `Pair{ `Number "1", `Number "1" }, `Pair{ `Number "2", `Number "2" }, `Pair{ `Number "3", `Number "3" }, `Pair{ `Number "4", `Number "4" }, `Pair{ `Number "5", `Number "5" } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local t = {{{}}, {"alo"}} +]=] +--[=[ +{ `Local{ { `Id "t" }, { `Table{ `Table{ `Table }, `Table{ `String "alo" } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +-- vararg + +s = [=[ +local f = function (...) + return ... +end +]=] +--[=[ +{ `Local{ { `Id "f" }, { `Function{ { `Dots }, { `Return{ `Dots } } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local f = function () + local g = function (x, y, ...) + return ...,...,... + end +end +]=] +--[=[ +{ `Local{ { `Id "f" }, { `Function{ { }, { `Local{ { `Id "g" }, { `Function{ { `Id "x", `Id "y", `Dots }, { `Return{ `Dots, `Dots, `Dots } } } } } } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local function f (x, ...) + return ... +end +]=] +--[=[ +{ `Localrec{ { `Id "f" }, { `Function{ { `Id "x", `Dots }, { `Return{ `Dots } } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local f = function (x, ...) + return ... +end +]=] +--[=[ +{ `Local{ { `Id "f" }, { `Function{ { `Id "x", `Dots }, { `Return{ `Dots } } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +-- while + +s = [=[ +local i = 0 +while (i < 10) +do + i = i + 1 +end +]=] +--[=[ +{ `Local{ { `Id "i" }, { `Number "0" } }, `While{ `Paren{ `Op{ "lt", `Id "i", `Number "10" } }, { `Set{ { `Id "i" }, { `Op{ "add", `Id "i", `Number "1" } } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +-- type annotations + +s = [=[ +local x:nil +]=] +--[=[ +{ `Local{ { `Id "x":`TNil }, { } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local x:false, y:true +]=] +--[=[ +{ `Local{ { `Id "x":`TLiteral false, `Id "y":`TLiteral true }, { } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local x:1, y:1.1 +]=] +--[=[ +{ `Local{ { `Id "x":`TLiteral 1, `Id "y":`TLiteral 1.1 }, { } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local x:"hello", y:'world' +]=] +--[=[ +{ `Local{ { `Id "x":`TLiteral hello, `Id "y":`TLiteral world }, { } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local x:boolean, y:number, z:string +]=] +--[=[ +{ `Local{ { `Id "x":`TBase boolean, `Id "y":`TBase number, `Id "z":`TBase string }, { } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local x:any +]=] +--[=[ +{ `Local{ { `Id "x":`TAny }, { } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local x:number? +]=] +--[=[ +{ `Local{ { `Id "x":`TUnion{ `TBase number, `TNil } }, { } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local x:number|nil +]=] +--[=[ +{ `Local{ { `Id "x":`TUnion{ `TBase number, `TNil } }, { } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local x:number|string|nil +]=] +--[=[ +{ `Local{ { `Id "x":`TUnion{ `TBase number, `TBase string, `TNil } }, { } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local x:number|nil|nil|nil|nil +]=] +--[=[ +{ `Local{ { `Id "x":`TUnion{ `TBase number, `TNil } }, { } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local x:number|nil|string|nil|number|boolean|string +]=] +--[=[ +{ `Local{ { `Id "x":`TUnion{ `TNil, `TBase number, `TBase boolean, `TBase string } }, { } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local x:number|string? +]=] +--[=[ +{ `Local{ { `Id "x":`TUnion{ `TBase number, `TBase string, `TNil } }, { } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local x:(number) -> (number) +]=] +--[=[ +{ `Local{ { `Id "x":`TFunction{ `TTuple{ `TBase number, `TVararg{ `TValue } }, `TTuple{ `TBase number, `TVararg{ `TNil } } } }, { } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local x:(value*) -> (nil*) +]=] +--[=[ +{ `Local{ { `Id "x":`TFunction{ `TTuple{ `TVararg{ `TValue } }, `TTuple{ `TVararg{ `TNil } } } }, { } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local x:(number,string,boolean) -> (string,number,boolean) +]=] +--[=[ +{ `Local{ { `Id "x":`TFunction{ `TTuple{ `TBase number, `TBase string, `TBase boolean, `TVararg{ `TValue } }, `TTuple{ `TBase string, `TBase number, `TBase boolean, `TVararg{ `TNil } } } }, { } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local x:(number,string,value*) -> (string,number,nil*) +]=] +--[=[ +{ `Local{ { `Id "x":`TFunction{ `TTuple{ `TBase number, `TBase string, `TVararg{ `TValue } }, `TTuple{ `TBase string, `TBase number, `TVararg{ `TNil } } } }, { } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local x:{} +]=] +--[=[ +{ `Local{ { `Id "x":`TTable{ } }, { } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local x:{{{{{}}}}} +]=] +--[=[ +{ `Local{ { `Id "x":`TTable{ `TBase number:`TUnion{ `TTable{ `TBase number:`TUnion{ `TTable{ `TBase number:`TUnion{ `TTable{ `TBase number:`TUnion{ `TTable{ }, `TNil } }, `TNil } }, `TNil } }, `TNil } } }, { } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local x:{string} +]=] +--[=[ +{ `Local{ { `Id "x":`TTable{ `TBase number:`TUnion{ `TBase string, `TNil } } }, { } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local x:{string:number} +]=] +--[=[ +{ `Local{ { `Id "x":`TTable{ `TBase string:`TUnion{ `TBase number, `TNil } } }, { } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local x:{'firstname':string, 'lastname':string} +]=] +--[=[ +{ `Local{ { `Id "x":`TTable{ `TLiteral firstname:`TBase string, `TLiteral lastname:`TBase string } }, { } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local x:{'tag':string, number:string} +]=] +--[=[ +{ `Local{ { `Id "x":`TTable{ `TLiteral tag:`TBase string, `TBase number:`TUnion{ `TBase string, `TNil } } }, { } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local x:{'f':(number) -> (number), 't':{number:number}} +]=] +--[=[ +{ `Local{ { `Id "x":`TTable{ `TLiteral f:`TFunction{ `TTuple{ `TBase number, `TVararg{ `TValue } }, `TTuple{ `TBase number, `TVararg{ `TNil } } }, `TLiteral t:`TTable{ `TBase number:`TUnion{ `TBase number, `TNil } } } }, { } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +for k:number, v:string in ipairs({"hello", "world"}) do end +]=] +--[=[ +{ `Forin{ { `Id "k":`TBase number, `Id "v":`TBase string }, { `Call{ `Index{ `Id "_ENV", `String "ipairs" }, `Table{ `String "hello", `String "world" } } }, { } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +for k:string, v in pairs({}) do end +]=] +--[=[ +{ `Forin{ { `Id "k":`TBase string, `Id "v" }, { `Call{ `Index{ `Id "_ENV", `String "pairs" }, `Table } }, { } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +for k, v:boolean in pairs({}) do end +]=] +--[=[ +{ `Forin{ { `Id "k", `Id "v":`TBase boolean }, { `Call{ `Index{ `Id "_ENV", `String "pairs" }, `Table } }, { } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local function f (x:any) end +]=] +--[=[ +{ `Localrec{ { `Id "f" }, { `Function{ { `Id "x":`TAny }, { } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local function f (x:any):(any) end +]=] +--[=[ +{ `Localrec{ { `Id "f" }, { `Function{ { `Id "x":`TAny }:`TTuple{ `TAny, `TVararg{ `TNil } }, { } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local function f (...:any) end +]=] +--[=[ +{ `Localrec{ { `Id "f" }, { `Function{ { `Dots:`TAny }, { } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local function f (x:any, ...:any) end +]=] +--[=[ +{ `Localrec{ { `Id "f" }, { `Function{ { `Id "x":`TAny, `Dots:`TAny }, { } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local function f (x, ...:any) end +]=] +--[=[ +{ `Localrec{ { `Id "f" }, { `Function{ { `Id "x", `Dots:`TAny }, { } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local function f (x:any, ...) end +]=] +--[=[ +{ `Localrec{ { `Id "f" }, { `Function{ { `Id "x":`TAny, `Dots }, { } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local function f (x:any, ...:any):(any) end +]=] +--[=[ +{ `Localrec{ { `Id "f" }, { `Function{ { `Id "x":`TAny, `Dots:`TAny }:`TTuple{ `TAny, `TVararg{ `TNil } }, { } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local function f (x:(any) -> (any)):((any) -> (any)) end +]=] +--[=[ +{ `Localrec{ { `Id "f" }, { `Function{ { `Id "x":`TFunction{ `TTuple{ `TAny, `TVararg{ `TValue } }, `TTuple{ `TAny, `TVararg{ `TNil } } } }:`TTuple{ `TFunction{ `TTuple{ `TAny, `TVararg{ `TValue } }, `TTuple{ `TAny, `TVararg{ `TNil } } }, `TVararg{ `TNil } }, { } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local function f (x:(number, number) -> (number, nil*)):(number*) end +]=] +--[=[ +{ `Localrec{ { `Id "f" }, { `Function{ { `Id "x":`TFunction{ `TTuple{ `TBase number, `TBase number, `TVararg{ `TValue } }, `TTuple{ `TBase number, `TVararg{ `TNil } } } }:`TTuple{ `TVararg{ `TBase number } }, { } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local function f ():(number, nil*) end +]=] +--[=[ +{ `Localrec{ { `Id "f" }, { `Function{ { }:`TTuple{ `TBase number, `TVararg{ `TNil } }, { } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local function f ():number end +]=] +--[=[ +{ `Localrec{ { `Id "f" }, { `Function{ { }:`TTuple{ `TBase number, `TVararg{ `TNil } }, { } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local function f ():number? end +]=] +--[=[ +{ `Localrec{ { `Id "f" }, { `Function{ { }:`TTuple{ `TUnion{ `TBase number, `TNil }, `TVararg{ `TNil } }, { } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local function f ():(number) | (nil,string) end +]=] +--[=[ +{ `Localrec{ { `Id "f" }, { `Function{ { }:`TUnionlist{ `TTuple{ `TBase number, `TVararg{ `TNil } }, `TTuple{ `TNil, `TBase string, `TVararg{ `TNil } } }, { } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local function f ():(number)? end +]=] +--[=[ +{ `Localrec{ { `Id "f" }, { `Function{ { }:`TUnionlist{ `TTuple{ `TBase number, `TVararg{ `TNil } }, `TTuple{ `TNil, `TBase string, `TVararg{ `TNil } } }, { } } } } } +]=] + +r, m = parse(s) +assert(r == true) + +-- syntax error + +-- anonymous functions + +s = [=[ +a = function (a,b,) end +]=] +--[=[ +test.lua:1:19: syntax error, unexpected ')', expecting '...', 'Name' +]=] +e = [=[ +test.lua:1:18: expecting '...' +]=] + +r, m = parse(s) +assert(m == e) + +s = [=[ +a = function (...,a) end +]=] +--[=[ +test.lua:1:18: syntax error, unexpected ',', expecting ')', ':' +]=] +e = [=[ +test.lua:1:17: missing ')' +]=] + +r, m = parse(s) +assert(m == e) + +s = [=[ +local a = function (1) end +]=] +--[=[ +test.lua:1:21: syntax error, unexpected '1', expecting ')', '...', 'Name' +]=] +e = [=[ +test.lua:1:20: missing ')' +]=] + +r, m = parse(s) +assert(m == e) + +s = [=[ +local test = function ( a , b , c , ... ) +]=] +--[=[ +test.lua:2:1: syntax error, unexpected 'EOF', expecting 'end', 'return', '(', 'Name', 'typealias', 'interface', 'goto', 'break', '::', 'local', 'function', 'const', 'repeat', 'for', 'do', 'while', 'if', ';', ':' +]=] +e = [=[ +test.lua:2:1: missing 'end' to close function declaration +]=] + +r, m = parse(s) +assert(m == e) + +-- arithmetic expressions + +s = [=[ +a = 3 / / 2 +]=] +--[=[ +test.lua:1:9: syntax error, unexpected '/', expecting '(', 'Name', '{', 'function', '...', 'true', 'false', 'nil', 'String', 'Number', '#', '~', '-', 'not' +]=] +e = [=[ +test.lua:1:8: malformed multiplication expression +]=] + +r, m = parse(s) +assert(m == e) + +-- bitwise expressions + +s = [=[ +b = 1 && 1 +]=] +--[=[ +test.lua:1:8: syntax error, unexpected '&', expecting '(', 'Name', '{', 'function', '...', 'true', 'false', 'nil', 'String', 'Number', '#', '~', '-', 'not' +]=] +e = [=[ +test.lua:1:7: malformed '&' expression +]=] + +r, m = parse(s) +assert(m == e) + +s = [=[ +b = 1 <> 0 +]=] +--[=[ +test.lua:1:8: syntax error, unexpected '>', expecting '(', 'Name', '{', 'function', '...', 'true', 'false', 'nil', 'String', 'Number', '#', '~', '-', 'not' +]=] +e = [=[ +test.lua:1:7: malformed relational expression +]=] + +r, m = parse(s) +assert(m == e) + +s = [=[ +b = 1 < < 0 +]=] +--[=[ +test.lua:1:9: syntax error, unexpected '<', expecting '(', 'Name', '{', 'function', '...', 'true', 'false', 'nil', 'String', 'Number', '#', '~', '-', 'not' +]=] +e = [=[ +test.lua:1:8: malformed relational expression +]=] + +r, m = parse(s) +assert(m == e) + +-- concatenation expressions + +s = [=[ +concat2 = 2^3..1 +]=] +--[=[ +test.lua:1:15: syntax error, unexpected '.1', expecting 'return', '(', 'Name', 'typealias', 'interface', 'goto', 'break', '::', 'local', 'function', 'const', 'repeat', 'for', 'do', 'while', 'if', ';', ',', 'or', 'and', '>', '<', '>=', '<=', '==', '~=', '|', '~', '&', '>>', '<<', '..', '-', '+', '%', '/', '//', '*', '^' +]=] +e = [=[ +test.lua:1:14: malformed +]=] + +r, m = parse(s) +assert(m == e) + +-- for generic + +s = [=[ +for k;v in pairs(t) do end +]=] +--[=[ +test.lua:1:6: syntax error, unexpected ';', expecting 'in', ',', ':', '=' +]=] +e = [=[ +test.lua:1:5: expecting 'in' +]=] + +r, m = parse(s) +assert(m == e) + +s = [=[ +for k,v in pairs(t:any) do end +]=] +--[=[ +test.lua:1:23: syntax error, unexpected ')', expecting 'String', '{', '(' +]=] +e = [=[ +test.lua:1:22: expecting '(' for method call +]=] + +r, m = parse(s) +assert(m == e) + +-- for numeric + +s = [=[ +for i=1,10, do end +]=] +--[=[ +test.lua:1:13: syntax error, unexpected 'do', expecting '(', 'Name', '{', 'function', '...', 'true', 'false', 'nil', 'String', 'Number', '#', '~', '-', 'not' +]=] +e = [=[ +test.lua:1:10: missing 'do' in for statement +]=] + +r, m = parse(s) +assert(m == e) + +s = [=[ +for i=1,n:number do end +]=] +--[=[ +test.lua:1:18: syntax error, unexpected 'do', expecting 'String', '{', '(' +]=] +e = [=[ +test.lua:1:17: expecting '(' for method call +]=] + +r, m = parse(s) +assert(m == e) + +-- global functions + +s = [=[ +function func(a,b,c,) end +]=] +--[=[ +test.lua:1:21: syntax error, unexpected ')', expecting '...', 'Name' +]=] +e = [=[ +test.lua:1:20: expecting '...' +]=] + +r, m = parse(s) +assert(m == e) + +s = [=[ +function func(...,a) end +]=] +--[=[ +test.lua:1:18: syntax error, unexpected ',', expecting ')', ':' +]=] +e = [=[ +test.lua:1:17: missing ')' +]=] + +r, m = parse(s) +assert(m == e) + +s = [=[ +function a.b:c:d () end +]=] +--[=[ +test.lua:1:15: syntax error, unexpected ':', expecting '(' +]=] +e = [=[ +test.lua:1:14: missing '(' +]=] + +r, m = parse(s) +assert(m == e) + +-- goto + +s = [=[ +:: label :: return +goto label +]=] +--[=[ +test.lua:2:1: syntax error, unexpected 'goto', expecting ';', '(', 'Name', '{', 'function', '...', 'true', 'false', 'nil', 'String', 'Number', '#', '~', '-', 'not' +]=] +e = [=[ +test.lua:2:1: invalid statement after 'return' +]=] + +r, m = parse(s) +assert(m == e) + +-- if-else + +s = [=[ +if a then +]=] +--[=[ +test.lua:2:1: syntax error, unexpected 'EOF', expecting 'end', 'else', 'elseif', 'return', '(', 'Name', 'typealias', 'interface', 'goto', 'break', '::', 'local', 'function', 'const', 'repeat', 'for', 'do', 'while', 'if', ';' +]=] +e = [=[ +test.lua:2:1: missing 'end' to close if statement +]=] + +r, m = parse(s) +assert(m == e) + +s = [=[ +if a then else +]=] +--[=[ +test.lua:2:1: syntax error, unexpected 'EOF', expecting 'end', 'return', '(', 'Name', 'typealias', 'interface', 'goto', 'break', '::', 'local', 'function', 'const', 'repeat', 'for', 'do', 'while', 'if', ';' +]=] +e = [=[ +test.lua:2:1: missing 'end' to close if statement +]=] + +r, m = parse(s) +assert(m == e) + +s = [=[ +if a then + return a +elseif b then + return b +elseif + +end +]=] +--[=[ +test.lua:7:1: syntax error, unexpected 'end', expecting '(', 'Name', '{', 'function', '...', 'true', 'false', 'nil', 'String', 'Number', '#', '~', '-', 'not' +]=] +e = [=[ +test.lua:7:1: expecting after 'elseif' +]=] + +r, m = parse(s) +assert(m == e) + +s = [=[ +if a:any then else end +]=] +--[=[ +test.lua:1:10: syntax error, unexpected 'then', expecting 'String', '{', '(' +]=] +e = [=[ +test.lua:1:9: expecting '(' for method call +]=] + +r, m = parse(s) +assert(m == e) + +-- labels + +s = [=[ +:: blah :: +:: not :: +]=] +--[=[ +test.lua:2:4: syntax error, unexpected 'not', expecting 'Name' +]=] +e = [=[ +test.lua:2:3: expecting after '::' +]=] + +r, m = parse(s) +assert(m == e) + +-- locals + +s = [=[ +local a = +]=] +--[=[ +test.lua:2:1: syntax error, unexpected 'EOF', expecting '(', 'Name', '{', 'function', '...', 'true', 'false', 'nil', 'String', 'Number', '#', '~', '-', 'not' +]=] +e = [=[ +test.lua:2:1: expecting expression list after '=' +]=] + +r, m = parse(s) +assert(m == e) + +s = [=[ +local function t.a() end +]=] +--[=[ +test.lua:1:17: syntax error, unexpected '.', expecting '(' +]=] +e = [=[ +test.lua:1:16: missing '(' +]=] + +r, m = parse(s) +assert(m == e) + +s = [=[ +local function test (a,) end +]=] +--[=[ +test.lua:1:24: syntax error, unexpected ')', expecting '...', 'Name' +]=] +e = [=[ +test.lua:1:23: expecting '...' +]=] + +r, m = parse(s) +assert(m == e) + +s = [=[ +local function test(...,a) end +]=] +--[=[ +test.lua:1:24: syntax error, unexpected ',', expecting ')', ':' +]=] +e = [=[ +test.lua:1:23: missing ')' +]=] + +r, m = parse(s) +assert(m == e) + +s = [=[ +local function (a, b, c, ...) end +]=] +--[=[ +test.lua:1:16: syntax error, unexpected '(', expecting 'Name' +]=] +e = [=[ +test.lua:1:15: expecting in local function declaration +]=] + +r, m = parse(s) +assert(m == e) + +-- repeat + +s = [=[ +repeat + a,b,c = 1+1,2+2,3+3 + break +]=] +--[=[ +test.lua:4:1: syntax error, unexpected 'EOF', expecting 'until', 'return', '(', 'Name', 'typealias', 'interface', 'goto', 'break', '::', 'local', 'function', 'const', 'repeat', 'for', 'do', 'while', 'if', ';' +]=] +e = [=[ +test.lua:4:1: missing 'until' in repeat statement +]=] + +r, m = parse(s) +assert(m == e) + +-- return + +s = [=[ +return +return 1 +return 1,1-2*3+4,"alo" +return; +return 1; +return 1,1-2*3+4,"alo"; +]=] +--[=[ +test.lua:2:1: syntax error, unexpected 'return', expecting ';', '(', 'Name', '{', 'function', '...', 'true', 'false', 'nil', 'String', 'Number', '#', '~', '-', 'not' +]=] +e = [=[ +test.lua:2:1: invalid statement +]=] + +r, m = parse(s) +assert(m == e) + +-- tables + +s = [=[ +t = { , } +]=] +--[=[ +test.lua:1:7: syntax error, unexpected ',', expecting '}', '(', '{', 'function', '...', 'true', 'false', 'nil', 'String', 'Number', '#', '~', '-', 'not', 'Name', '[', 'const' +]=] +e = [=[ +test.lua:1:6: missing '}' +]=] + +r, m = parse(s) +assert(m == e) + +-- while + +s = [=[ +i = 0 +while (i < 10) + i = i + 1 +end +]=] +--[=[ +test.lua:3:3: syntax error, unexpected 'i', expecting 'do', 'or', 'and', '>', '<', '>=', '<=', '==', '~=', '|', '~', '&', '>>', '<<', '..', '-', '+', '%', '/', '//', '*', '^', 'String', '{', '(', ':', '[', '.' +]=] +e = [=[ +test.lua:3:2: missing 'do' in while statement +]=] + +r, m = parse(s) +assert(m == e) + +-- type annotations + +s = [=[ +t[x:any] = 1 +]=] +--[=[ +test.lua:1:8: syntax error, unexpected ']', expecting 'String', '{', '(' +]=] +e = [=[ +test.lua:1:7: expecting '(' for method call +]=] + +r, m = parse(s) +assert(m == e) + +s = [=[ +x:number, y, z:boolean = 1, nil, true +]=] +--[=[ +test.lua:1:9: syntax error, unexpected ',', expecting 'String', '{', '(' +]=] +e = [=[ +test.lua:1:8: expecting '(' for method call +]=] + +r, m = parse(s) +assert(m == e) + +s = [=[ +x = x:any +]=] +--[=[ +test.lua:2:1: syntax error, unexpected 'EOF', expecting 'String', '{', '(' +]=] +e = [=[ +test.lua:2:1: expecting '(' for method call +]=] + +r, m = parse(s) +assert(m == e) + +s = [=[ +x = ...:any +]=] +--[=[ +test.lua:1:8: syntax error, unexpected ':', expecting 'return', '(', 'Name', 'typealias', 'interface', 'goto', 'break', '::', 'local', 'function', 'const', 'repeat', 'for', 'do', 'while', 'if', ';', ',', 'or', 'and', '>', '<', '>=', '<=', '==', '~=', '|', '~', '&', '>>', '<<', '..', '-', '+', '%', '/', '//', '*', '^' +]=] +e = [=[ +test.lua:1:7: invalid statement +]=] + +r, m = parse(s) +assert(m == e) + +s = [=[ +f(x:any) +]=] +--[=[ +test.lua:1:8: syntax error, unexpected ')', expecting 'String', '{', '(' +]=] +e = [=[ +test.lua:1:7: expecting '(' for method call +]=] + +r, m = parse(s) +assert(m == e) + +s = [=[ +f(...:any) +]=] +--[=[ +test.lua:1:6: syntax error, unexpected ':', expecting ')', ',', 'or', 'and', '>', '<', '>=', '<=', '==', '~=', '|', '~', '&', '>>', '<<', '..', '-', '+', '%', '/', '//', '*', '^' +]=] +e = [=[ +test.lua:1:5: missing ')' +]=] + +r, m = parse(s) +assert(m == e) + +s = [=[ +local x:number* +]=] +--[=[ +test.lua:1:15: syntax error, unexpected '*', expecting 'return', '(', 'Name', 'typealias', 'interface', 'goto', 'break', '::', 'local', 'function', 'const', 'repeat', 'for', 'do', 'while', 'if', ';', '=', ',', '?', '|' +]=] +e = [=[ +test.lua:1:6: invalid local declaration +]=] + +r, m = parse(s) +assert(m == e) + +s = [=[ +local x:number| +]=] +--[=[ +test.lua:2:1: syntax error, unexpected 'EOF', expecting '{', '(', 'Type' +]=] +e = [=[ +test.lua:2:1: expecting after '|' +]=] + +r, m = parse(s) +assert(m == e) + +s = [=[ +local x:number?|string? +]=] +--[=[ +test.lua:1:16: syntax error, unexpected '|', expecting 'return', '(', 'Name', 'typealias', 'interface', 'goto', 'break', '::', 'local', 'function', 'const', 'repeat', 'for', 'do', 'while', 'if', ';', '=', ',' +]=] +e = [=[ +test.lua:1:6: invalid local declaration +]=] + +r, m = parse(s) +assert(m == e) + +s = [=[ +local x:() -> number +]=] +--[=[ +test.lua:1:15: syntax error, unexpected 'number', expecting '(' +]=] +e = [=[ +test.lua:1:14: expecting after '->' +]=] + +r, m = parse(s) +assert(m == e) + +s = [=[ +local x:() -> (number)? | (string)? +]=] +--[=[ +test.lua:1:35: syntax error, unexpected '?', expecting '->' +]=] +e = [=[ +test.lua:1:26: expecting after '|' +]=] + +r, m = parse(s) +assert(m == e) + +s = [=[ +local x:{()->():string} +]=] +--[=[ +test.lua:1:16: syntax error, unexpected ':', expecting '}', '?', '|' +]=] +e = [=[ +test.lua:1:15: missing '}' +]=] + +r, m = parse(s) +assert(m == e) + +s = [=[ +local x:{string:t 1} +]=] +--[=[ +test.lua:1:19: syntax error, unexpected '1', expecting '}', '?', '|' +]=] +e = [=[ +test.lua:1:18: missing '}' +]=] + +r, m = parse(s) +assert(m == e) + +s = [=[ +local x:{{{{{}}}} +]=] +--[=[ +test.lua:2:1: syntax error, unexpected 'EOF', expecting '}', '?', '|' +]=] +e = [=[ +test.lua:2:1: missing '}' +]=] + +r, m = parse(s) +assert(m == e) + +-- syntax errors that depend on some semantic information + +-- break + +s = [=[ +break +]=] +--[=[ +test.lua:1:1: syntax error, not inside a loop +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +function f (x) + if 1 then break end +end +]=] +--[=[ +test.lua:2:13: syntax error, not inside a loop +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +while 1 do +end +break +]=] +--[=[ +test.lua:3:1: syntax error, not inside a loop +]=] + +r, m = parse(s) +assert(r == true) + +-- goto + +s = [=[ +goto label +]=] +--[=[ +test.lua:1:1: syntax error, no visible label 'label' for +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +goto label +::other_label:: +]=] +--[=[ +test.lua:1:1: syntax error, no visible label 'label' for +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +::other_label:: +do do do goto label end end end +]=] +--[=[ +test.lua:2:10: syntax error, no visible label 'label' for +]=] + +r, m = parse(s) +assert(r == true) + +-- interfaces + +s = [=[ +local interface X + x:number + y:number + z:number + x:number +end +]=] +--[=[ +test.lua:1:7: syntax error, attempt to redeclare field 'x' +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local interface X + x, y, z, x:number +end +]=] +--[=[ +test.lua:1:7: syntax error, attempt to redeclare field 'x' +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local interface boolean end +]=] +--[=[ +test.lua:1:7: syntax error, attempt to redeclare type 'boolean' +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local interface number end +]=] +--[=[ +test.lua:1:7: syntax error, attempt to redeclare type 'number' +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local interface string end +]=] +--[=[ +test.lua:1:7: syntax error, attempt to redeclare type 'string' +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local interface value end +]=] +--[=[ +test.lua:1:7: syntax error, attempt to redeclare type 'value' +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local interface any end +]=] +--[=[ +test.lua:1:7: syntax error, attempt to redeclare type 'any' +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local interface self end +]=] +--[=[ +test.lua:1:7: syntax error, attempt to redeclare type 'self' +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local interface const end +]=] +--[=[ +test.lua:1:7: syntax error, attempt to redeclare type 'const' +]=] + +r, m = parse(s) +assert(r == true) + +-- labels + +s = [=[ +::label:: +::other_label:: +::label:: +]=] +--[=[ +test.lua:3:1: syntax error, label 'label' already defined +]=] + +r, m = parse(s) +assert(r == true) + +-- vararg + +s = [=[ +function f () + return ... +end +]=] +--[=[ +test.lua:2:10: syntax error, cannot use '...' outside a vararg function +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +function f () + function g (x, y) + return ...,...,... + end +end +]=] +--[=[ +test.lua:3:12: syntax error, cannot use '...' outside a vararg function +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local function f (x) + return ... +end +]=] +--[=[ +test.lua:2:10: syntax error, cannot use '...' outside a vararg function +]=] + +r, m = parse(s) +assert(r == true) + +s = [=[ +local f = function (x) + return ... +end +]=] +--[=[ +test.lua:2:10: syntax error, cannot use '...' outside a vararg function +]=] + +r, m = parse(s) +assert(r == true) + +print("OK") diff --git a/06/lpeglabel/examples/typedlua/tlerror.lua b/06/lpeglabel/examples/typedlua/tlerror.lua new file mode 100644 index 0000000..94be024 --- /dev/null +++ b/06/lpeglabel/examples/typedlua/tlerror.lua @@ -0,0 +1,66 @@ + +local errors = {} +local function new_error (label, msg) + table.insert(errors, { label = label, msg = msg }) +end + +new_error("Number", "malformed ") +new_error("String", "malformed ") +new_error("LongString", "unfinished long string") +new_error("LongComment", "unfinished long comment") +new_error("MissingOP", "missing '('") +new_error("MissingCP", "missing ')'") +new_error("MissingCC", "missing '}'") +new_error("MissingCB", "missing ']'") +new_error("UnionType", "expecting after '|'") +new_error("FunctionType", "expecting after '->'") +new_error("MethodType", "expecting after '=>'") +new_error("TupleType", "expecting after ','") +new_error("Type", "expecting after ':'") +new_error("TypeDecEnd", "missing 'end' in type declaration") +new_error("TypeAliasName", "expecting after 'typealias'") +new_error("MissingEqTypeAlias", "missing '=' in 'typealias'") +new_error("DotIndex", "expecting after '.'") +new_error("MethodName", "expecting after ':'") +new_error("Then", "missing 'then'") +new_error("IfEnd", "missing 'end' to close if statement") +new_error("WhileDo", "missing 'do' in while statement") +new_error("WhileEnd", "missing 'end' to close while statement") +new_error("BlockEnd", "missing 'end' to close block") +new_error("ForDo", "missing 'do' in for statement") +new_error("ForEnd", "missing 'end' to close for statement") +new_error("Until", "missing 'until' in repeat statement") +new_error("FuncEnd", "missing 'end' to close function declaration") +new_error("ParList", "expecting '...'") +new_error("MethodCall", "expecting '(' for method call") +new_error("Label1", "expecting after '::'") +new_error("Label2", "expecting '::' to close label declaration") +new_error("LocalAssign1", "expecting expression list after '='") +new_error("LocalAssign2", "invalid local declaration") +new_error("ForGen", "expecting 'in'") +new_error("LocalFunc", "expecting in local function declaration") +new_error("RetStat", "invalid statement after 'return'") +new_error("ElseIf", "expecting after 'elseif'") +new_error("SubExpr_1", "malformed 'or' expression") +new_error("SubExpr_2", "malformed 'and' expression") +new_error("SubExpr_3", "malformed relational expression") +new_error("SubExpr_4", "malformed '|' expression") +new_error("SubExpr_5", "malformed '~' expression") +new_error("SubExpr_6", "malformed '&' expression") +new_error("SubExpr_7", "malformed shift expression") +new_error("SubExpr_8", "malformed '..' expression") +new_error("SubExpr_9", "malformed addition expression") +new_error("SubExpr_10", "malformed multiplication expression") +new_error("SubExpr_11", "malformed unary expression") +new_error("SubExpr_12", "malformed '^' expression") +new_error("Stat", "invalid statement") + +local labels = {} +for k, v in ipairs(errors) do + labels[v.label] = k +end + +return { + errors = errors, + labels = labels, +} diff --git a/06/lpeglabel/examples/typedlua/tllexer.lua b/06/lpeglabel/examples/typedlua/tllexer.lua new file mode 100644 index 0000000..96f296d --- /dev/null +++ b/06/lpeglabel/examples/typedlua/tllexer.lua @@ -0,0 +1,105 @@ +local tllexer = {} + +local lpeg = require "lpeglabel" +lpeg.locale(lpeg) + +local tlerror = require "tlerror" + +function tllexer.try (pat, label) + return pat + lpeg.T(tlerror.labels[label]) +end + +local function setffp (s, i, t, n) + if not t.ffp or i > t.ffp then + t.ffp = i + t.list = {} + t.list[n] = true + t.expected = "'" .. n .. "'" + elseif i == t.ffp then + if not t.list[n] then + t.list[n] = true + t.expected = "'" .. n .. "', " .. t.expected + end + end + return false +end + +local function updateffp (name) + return lpeg.Cmt(lpeg.Carg(1) * lpeg.Cc(name), setffp) +end + +tllexer.Shebang = lpeg.P("#") * (lpeg.P(1) - lpeg.P("\n"))^0 * lpeg.P("\n") + +local Space = lpeg.space^1 + +local Equals = lpeg.P("=")^0 +local Open = "[" * lpeg.Cg(Equals, "init") * "[" * lpeg.P("\n")^-1 +local Close = "]" * lpeg.C(Equals) * "]" +local CloseEQ = lpeg.Cmt(Close * lpeg.Cb("init"), + function (s, i, a, b) return a == b end) + +local LongString = Open * (lpeg.P(1) - CloseEQ)^0 * tllexer.try(Close, "LongString") / + function (s, o) return s end + +local LongStringCm1 = Open * (lpeg.P(1) - CloseEQ)^0 * Close / + function (s, o) return s end + +local Comment = lpeg.Rec(lpeg.P"--" * #Open * (LongStringCm1 / function() return end + lpeg.T(tlerror.labels["LongString"])), + lpeg.T(tlerror.labels["LongComment"]), tlerror.labels["LongString"]) + + lpeg.P("--") * (lpeg.P(1) - lpeg.P("\n"))^0 + +tllexer.Skip = (Space + Comment)^0 + +local idStart = lpeg.alpha + lpeg.P("_") +local idRest = lpeg.alnum + lpeg.P("_") + +local Keywords = lpeg.P("and") + "break" + "do" + "elseif" + "else" + "end" + + "false" + "for" + "function" + "goto" + "if" + "in" + + "local" + "nil" + "not" + "or" + "repeat" + "return" + + "then" + "true" + "until" + "while" + +tllexer.Reserved = Keywords * -idRest + +local Identifier = idStart * idRest^0 + +tllexer.Name = -tllexer.Reserved * Identifier * -idRest + +function tllexer.token (pat, name) + return pat * tllexer.Skip + updateffp(name) * lpeg.P(false) +end + +function tllexer.symb (str) + return tllexer.token(lpeg.P(str), str) +end + +function tllexer.kw (str) + return tllexer.token(lpeg.P(str) * -idRest, str) +end + +local Hex = (lpeg.P("0x") + lpeg.P("0X")) * tllexer.try(lpeg.xdigit^1, "Number") +local Expo = lpeg.S("eE") * lpeg.S("+-")^-1 * tllexer.try(lpeg.digit^1, "Number") +local Float = (((lpeg.digit^1 * lpeg.P(".") * lpeg.digit^0 * tllexer.try(-lpeg.P("."), "Number")) + + (lpeg.P(".") * lpeg.digit^1)) * Expo^-1) + + (lpeg.digit^1 * Expo) +local Int = lpeg.digit^1 + +tllexer.Number = Hex + Float + Int + +local ShortString = lpeg.P('"') * + ((lpeg.P('\\') * lpeg.P(1)) + (lpeg.P(1) - lpeg.P('"')))^0 * + tllexer.try(lpeg.P('"'), "String") + + lpeg.P("'") * + ((lpeg.P("\\") * lpeg.P(1)) + (lpeg.P(1) - lpeg.P("'")))^0 * + tllexer.try(lpeg.P("'"), "String") + +tllexer.String = LongString + ShortString + +-- for error reporting +tllexer.OneWord = tllexer.Name + + tllexer.Number + + tllexer.String + + tllexer.Reserved + + lpeg.P("...") + + lpeg.P(1) + +return tllexer diff --git a/06/lpeglabel/examples/typedlua/tlp.lua b/06/lpeglabel/examples/typedlua/tlp.lua new file mode 100644 index 0000000..2a4a736 --- /dev/null +++ b/06/lpeglabel/examples/typedlua/tlp.lua @@ -0,0 +1,20 @@ +local tlparser = require "tlparser" + +local function getcontents(filename) + file = assert(io.open(filename, "r")) + contents = file:read("*a") + file:close() + return contents +end + +if #arg ~= 1 then + print ("Usage: lua tlp.lua ") + os.exit(1) +end + +local filename = arg[1] +local subject = getcontents(filename) +local r, msg = tlparser.parse(subject, filename, false, true) +if not r then print(msg) end + +os.exit(0) diff --git a/06/lpeglabel/examples/typedlua/tlparser.lua b/06/lpeglabel/examples/typedlua/tlparser.lua new file mode 100644 index 0000000..a301fa6 --- /dev/null +++ b/06/lpeglabel/examples/typedlua/tlparser.lua @@ -0,0 +1,245 @@ +local tlparser = {} + +local lpeg = require "lpeglabel" +lpeg.locale(lpeg) + +local tllexer = require "tllexer" +local tlerror = require "tlerror" + +local function chainl1 (pat, sep, label) + return pat * (sep * tllexer.try(pat, label))^0 +end + +local G = lpeg.P { "TypedLua"; + TypedLua = tllexer.Shebang^-1 * tllexer.Skip * lpeg.V("Chunk") * tllexer.try(-1, "Stat"); + -- type language + Type = lpeg.V("NilableType"); + NilableType = lpeg.V("UnionType") * tllexer.symb("?")^-1; + UnionType = lpeg.V("PrimaryType") * (tllexer.symb("|") * tllexer.try(lpeg.V("PrimaryType"), "UnionType"))^0; + PrimaryType = lpeg.V("LiteralType") + + lpeg.V("BaseType") + + lpeg.V("NilType") + + lpeg.V("ValueType") + + lpeg.V("AnyType") + + lpeg.V("SelfType") + + lpeg.V("FunctionType") + + lpeg.V("TableType") + + lpeg.V("VariableType"); + LiteralType = tllexer.token("false", "false") + + tllexer.token("true", "true") + + tllexer.token(tllexer.Number, "Number") + + tllexer.token(tllexer.String, "String"); + BaseType = tllexer.token("boolean", "boolean") + + tllexer.token("number", "number") + + tllexer.token("string", "string") + + tllexer.token("integer", "integer"); + NilType = tllexer.token("nil", "nil"); + ValueType = tllexer.token("value", "value"); + AnyType = tllexer.token("any", "any"); + SelfType = tllexer.token("self", "self"); + FunctionType = lpeg.V("InputType") * tllexer.symb("->") * tllexer.try(lpeg.V("NilableTuple"), "FunctionType"); + MethodType = lpeg.V("InputType") * tllexer.symb("=>") * tllexer.try(lpeg.V("NilableTuple"), "MethodType"); + InputType = tllexer.symb("(") * lpeg.V("TupleType")^-1 * tllexer.try(tllexer.symb(")"), "MissingCP"); + NilableTuple = lpeg.V("UnionlistType") * tllexer.symb("?")^-1; + UnionlistType = lpeg.V("OutputType") * (tllexer.symb("|") * tllexer.try(lpeg.V("OutputType"), "UnionType"))^0; + OutputType = tllexer.symb("(") * lpeg.V("TupleType")^-1 * tllexer.try(tllexer.symb(")"), "MissingCP"); + TupleType = lpeg.V("Type") * (tllexer.symb(",") * tllexer.try(lpeg.V("Type"), "TupleType"))^0 * tllexer.symb("*")^-1; + TableType = tllexer.symb("{") * lpeg.V("TableTypeBody")^-1 * tllexer.try(tllexer.symb("}"), "MissingCC"); + TableTypeBody = lpeg.V("RecordType") + + lpeg.V("HashType") + + lpeg.V("ArrayType"); + RecordType = lpeg.V("RecordField") * (tllexer.symb(",") * lpeg.V("RecordField"))^0 * + (tllexer.symb(",") * (lpeg.V("HashType") + lpeg.V("ArrayType")))^-1; + RecordField = tllexer.kw("const")^-1 * + lpeg.V("LiteralType") * tllexer.symb(":") * tllexer.try(lpeg.V("Type"), "Type"); + HashType = lpeg.V("KeyType") * tllexer.symb(":") * tllexer.try(lpeg.V("FieldType"), "Type"); + ArrayType = lpeg.V("FieldType"); + KeyType = lpeg.V("BaseType") + lpeg.V("ValueType") + lpeg.V("AnyType"); + FieldType = lpeg.V("Type"); + VariableType = tllexer.token(tllexer.Name, "Name"); + RetType = lpeg.V("NilableTuple") + + lpeg.V("Type"); + Id = tllexer.token(tllexer.Name, "Name"); + TypeDecId = (tllexer.kw("const") * lpeg.V("Id")) + + lpeg.V("Id"); + IdList = lpeg.V("TypeDecId") * (tllexer.symb(",") * tllexer.try(lpeg.V("TypeDecId"), "TupleType"))^0; + IdDec = lpeg.V("IdList") * tllexer.symb(":") * tllexer.try((lpeg.V("Type") + lpeg.V("MethodType")), "Type"); + IdDecList = (lpeg.V("IdDec")^1)^-1; + TypeDec = tllexer.token(tllexer.Name, "Name") * lpeg.V("IdDecList") * tllexer.try(tllexer.kw("end"), "TypeDecEnd"); + Interface = tllexer.kw("interface") * lpeg.V("TypeDec") + + tllexer.kw("typealias") * + tllexer.try(tllexer.token(tllexer.Name, "Name"), "TypeAliasName") * + tllexer.try(tllexer.symb("="), "MissingEqTypeAlias") * lpeg.V("Type"); + -- parser + Chunk = lpeg.V("Block"); + StatList = (tllexer.symb(";") + lpeg.V("Stat"))^0; + Var = lpeg.V("Id"); + TypedId = tllexer.token(tllexer.Name, "Name") * (tllexer.symb(":") * tllexer.try(lpeg.V("Type"), "Type"))^-1; + FunctionDef = tllexer.kw("function") * lpeg.V("FuncBody"); + FieldSep = tllexer.symb(",") + tllexer.symb(";"); + Field = ((tllexer.symb("[") * lpeg.V("Expr") * tllexer.try(tllexer.symb("]"), "MissingCB")) + + (tllexer.token(tllexer.Name, "Name"))) * + tllexer.symb("=") * lpeg.V("Expr") + + lpeg.V("Expr"); + TField = (tllexer.kw("const") * lpeg.V("Field")) + + lpeg.V("Field"); + FieldList = (lpeg.V("TField") * (lpeg.V("FieldSep") * lpeg.V("TField"))^0 * + lpeg.V("FieldSep")^-1)^-1; + Constructor = tllexer.symb("{") * lpeg.V("FieldList") * tllexer.try(tllexer.symb("}"), "MissingCC"); + NameList = lpeg.V("TypedId") * (tllexer.symb(",") * lpeg.V("TypedId"))^0; + ExpList = lpeg.V("Expr") * (tllexer.symb(",") * lpeg.V("Expr"))^0; + FuncArgs = tllexer.symb("(") * + (lpeg.V("Expr") * (tllexer.symb(",") * lpeg.V("Expr"))^0)^-1 * + tllexer.try(tllexer.symb(")"), "MissingCP") + + lpeg.V("Constructor") + + tllexer.token(tllexer.String, "String"); + OrOp = tllexer.kw("or"); + AndOp = tllexer.kw("and"); + RelOp = tllexer.symb("~=") + + tllexer.symb("==") + + tllexer.symb("<=") + + tllexer.symb(">=") + + tllexer.symb("<") + + tllexer.symb(">"); + BOrOp = tllexer.symb("|"); + BXorOp = tllexer.symb("~") * -lpeg.P("="); + BAndOp = tllexer.symb("&"); + ShiftOp = tllexer.symb("<<") + + tllexer.symb(">>"); + ConOp = tllexer.symb(".."); + AddOp = tllexer.symb("+") + + tllexer.symb("-"); + MulOp = tllexer.symb("*") + + tllexer.symb("//") + + tllexer.symb("/") + + tllexer.symb("%"); + UnOp = tllexer.kw("not") + + tllexer.symb("-") + + tllexer.symb("~") + + tllexer.symb("#"); + PowOp = tllexer.symb("^"); + Expr = lpeg.V("SubExpr_1"); + SubExpr_1 = chainl1(lpeg.V("SubExpr_2"), lpeg.V("OrOp"), "SubExpr_1"); + SubExpr_2 = chainl1(lpeg.V("SubExpr_3"), lpeg.V("AndOp"), "SubExpr_2"); + SubExpr_3 = chainl1(lpeg.V("SubExpr_4"), lpeg.V("RelOp"), "SubExpr_3"); + SubExpr_4 = chainl1(lpeg.V("SubExpr_5"), lpeg.V("BOrOp"), "SubExpr_4"); + SubExpr_5 = chainl1(lpeg.V("SubExpr_6"), lpeg.V("BXorOp"), "SubExpr_5"); + SubExpr_6 = chainl1(lpeg.V("SubExpr_7"), lpeg.V("BAndOp"), "SubExpr_6"); + SubExpr_7 = chainl1(lpeg.V("SubExpr_8"), lpeg.V("ShiftOp"), "SubExpr_7"); + SubExpr_8 = lpeg.V("SubExpr_9") * lpeg.V("ConOp") * tllexer.try(lpeg.V("SubExpr_8"), "SubExpr_8") + + lpeg.V("SubExpr_9"); + SubExpr_9 = chainl1(lpeg.V("SubExpr_10"), lpeg.V("AddOp"), "SubExpr_9"); + SubExpr_10 = chainl1(lpeg.V("SubExpr_11"), lpeg.V("MulOp"), "SubExpr_10"); + SubExpr_11 = lpeg.V("UnOp") * tllexer.try(lpeg.V("SubExpr_11"), "SubExpr_11") + + lpeg.V("SubExpr_12"); + SubExpr_12 = lpeg.V("SimpleExp") * (lpeg.V("PowOp") * tllexer.try(lpeg.V("SubExpr_11"), "SubExpr_12"))^-1; + SimpleExp = tllexer.token(tllexer.Number, "Number") + + tllexer.token(tllexer.String, "String") + + tllexer.kw("nil") + + tllexer.kw("false") + + tllexer.kw("true") + + tllexer.symb("...") + + lpeg.V("FunctionDef") + + lpeg.V("Constructor") + + lpeg.V("SuffixedExp"); + SuffixedExp = lpeg.V("PrimaryExp") * ( + (tllexer.symb(".") * tllexer.try(tllexer.token(tllexer.Name, "Name"), "DotIndex")) / "index" + + (tllexer.symb("[") * lpeg.V("Expr") * tllexer.try(tllexer.symb("]"), "MissingCB")) / "index" + + (tllexer.symb(":") * tllexer.try(tllexer.token(tllexer.Name, "Name"), "MethodName") * tllexer.try(lpeg.V("FuncArgs"), "MethodCall")) / "call" + + lpeg.V("FuncArgs") / "call")^0 / function (...) local l = {...}; return l[#l] end; + PrimaryExp = lpeg.V("Var") / "var" + + tllexer.symb("(") * lpeg.V("Expr") * tllexer.try(tllexer.symb(")"), "MissingCP"); + Block = lpeg.V("StatList") * lpeg.V("RetStat")^-1; + IfStat = tllexer.kw("if") * lpeg.V("Expr") * tllexer.try(tllexer.kw("then"), "Then") * lpeg.V("Block") * + (tllexer.kw("elseif") * tllexer.try(lpeg.V("Expr"), "ElseIf") * tllexer.try(tllexer.kw("then"), "Then") * lpeg.V("Block"))^0 * + (tllexer.kw("else") * lpeg.V("Block"))^-1 * + tllexer.try(tllexer.kw("end"), "IfEnd"); + WhileStat = tllexer.kw("while") * lpeg.V("Expr") * + tllexer.try(tllexer.kw("do"), "WhileDo") * lpeg.V("Block") * tllexer.try(tllexer.kw("end"), "WhileEnd"); + DoStat = tllexer.kw("do") * lpeg.V("Block") * tllexer.try(tllexer.kw("end"), "BlockEnd"); + ForBody = tllexer.try(tllexer.kw("do"), "ForDo") * lpeg.V("Block"); + ForNum = lpeg.V("Id") * tllexer.symb("=") * lpeg.V("Expr") * tllexer.symb(",") * + lpeg.V("Expr") * (tllexer.symb(",") * lpeg.V("Expr"))^-1 * + lpeg.V("ForBody"); + ForGen = lpeg.V("NameList") * tllexer.try(tllexer.kw("in"), "ForGen") * + lpeg.V("ExpList") * lpeg.V("ForBody"); + ForStat = tllexer.kw("for") * (lpeg.V("ForNum") + lpeg.V("ForGen")) * tllexer.try(tllexer.kw("end"), "ForEnd"); + RepeatStat = tllexer.kw("repeat") * lpeg.V("Block") * + tllexer.try(tllexer.kw("until"), "Until") * lpeg.V("Expr"); + FuncName = lpeg.V("Id") * (tllexer.symb(".") * + (tllexer.token(tllexer.Name, "Name")))^0 * + (tllexer.symb(":") * (tllexer.token(tllexer.Name, "Name")))^-1; + ParList = lpeg.V("NameList") * (tllexer.symb(",") * tllexer.try(lpeg.V("TypedVarArg"), "ParList"))^-1 + + lpeg.V("TypedVarArg"); + TypedVarArg = tllexer.symb("...") * (tllexer.symb(":") * tllexer.try(lpeg.V("Type"), "Type"))^-1; + FuncBody = tllexer.try(tllexer.symb("("), "MissingOP") * lpeg.V("ParList")^-1 * tllexer.try(tllexer.symb(")"), "MissingCP") * + (tllexer.symb(":") * tllexer.try(lpeg.V("RetType"), "Type"))^-1 * + lpeg.V("Block") * tllexer.try(tllexer.kw("end"), "FuncEnd"); + FuncStat = tllexer.kw("const")^-1 * + tllexer.kw("function") * lpeg.V("FuncName") * lpeg.V("FuncBody"); + LocalFunc = tllexer.kw("function") * + tllexer.try(lpeg.V("Id"), "LocalFunc") * lpeg.V("FuncBody"); + LocalAssign = lpeg.V("NameList") * tllexer.symb("=") * tllexer.try(lpeg.V("ExpList"), "LocalAssign1") + + lpeg.V("NameList") * (#(-tllexer.symb("=") * (lpeg.V("Stat") + -1)) * lpeg.P(true)) + lpeg.T(tlerror.labels["LocalAssign2"]); + LocalStat = tllexer.kw("local") * + (lpeg.V("LocalTypeDec") + lpeg.V("LocalFunc") + lpeg.V("LocalAssign")); + LabelStat = tllexer.symb("::") * tllexer.try(tllexer.token(tllexer.Name, "Name"), "Label1") * tllexer.try(tllexer.symb("::"), "Label2"); + BreakStat = tllexer.kw("break"); + GoToStat = tllexer.kw("goto") * tllexer.token(tllexer.Name, "Name"); + RetStat = tllexer.kw("return") * tllexer.try(-lpeg.V("Stat"), "RetStat") * + (lpeg.V("Expr") * (tllexer.symb(",") * lpeg.V("Expr"))^0)^-1 * + tllexer.symb(";")^-1; + TypeDecStat = lpeg.V("Interface"); + LocalTypeDec = lpeg.V("TypeDecStat"); + LVar = (tllexer.kw("const") * lpeg.V("SuffixedExp")) + + lpeg.V("SuffixedExp"); + ExprStat = lpeg.Cmt(lpeg.V("LVar") * lpeg.V("Assignment"), + function (s, i, ...) + local l = {...} + local i = 1 + while l[i] ~= "=" do + local se = l[i] + if se ~= "var" and se ~= "index" then return false end + i = i + 1 + end + return true + end) + + lpeg.Cmt(lpeg.V("SuffixedExp"), + function (s, i, se) + if se ~= "call" then return false end + return true + end); + Assignment = ((tllexer.symb(",") * lpeg.V("LVar"))^1)^-1 * (tllexer.symb("=") / "=") * lpeg.V("ExpList"); + Stat = lpeg.V("IfStat") + lpeg.V("WhileStat") + lpeg.V("DoStat") + lpeg.V("ForStat") + + lpeg.V("RepeatStat") + lpeg.V("FuncStat") + lpeg.V("LocalStat") + + lpeg.V("LabelStat") + lpeg.V("BreakStat") + lpeg.V("GoToStat") + + lpeg.V("TypeDecStat") + lpeg.V("ExprStat"); +} + +local function lineno (s, i) + if i == 1 then return 1, 1 end + local rest, num = s:sub(1,i):gsub("[^\n]*\n", "") + local r = #rest + return 1 + num, r ~= 0 and r or 1 +end + +function tlparser.parse (subject, filename, strict, integer) + local errorinfo = {} + lpeg.setmaxstack(1000) + local ast, label, suffix = lpeg.match(G, subject, nil, errorinfo, strict, integer) + if not ast then + local line, col = lineno(subject, string.len(subject) - string.len(suffix)) + local error_msg = string.format("%s:%d:%d: ", filename, line, col) + if label ~= 0 then + error_msg = error_msg .. tlerror.errors[label].msg + else + local u = lpeg.match(lpeg.C(tllexer.OneWord) + lpeg.Cc("EOF"), subject, errorinfo.ffp) + error_msg = error_msg .. string.format("unexpected '%s', expecting %s", u, errorinfo.expected) + end + return nil, error_msg + else + return true + end +end + +return tlparser diff --git a/06/lpeglabel/lpcap.c b/06/lpeglabel/lpcap.c new file mode 100644 index 0000000..c9085de --- /dev/null +++ b/06/lpeglabel/lpcap.c @@ -0,0 +1,537 @@ +/* +** $Id: lpcap.c,v 1.6 2015/06/15 16:09:57 roberto Exp $ +** Copyright 2007, Lua.org & PUC-Rio (see 'lpeg.html' for license) +*/ + +#include "lua.h" +#include "lauxlib.h" + +#include "lpcap.h" +#include "lptypes.h" + + +#define captype(cap) ((cap)->kind) + +#define isclosecap(cap) (captype(cap) == Cclose) + +#define closeaddr(c) ((c)->s + (c)->siz - 1) + +#define isfullcap(cap) ((cap)->siz != 0) + +#define getfromktable(cs,v) lua_rawgeti((cs)->L, ktableidx((cs)->ptop), v) + +#define pushluaval(cs) getfromktable(cs, (cs)->cap->idx) + + + +/* +** Put at the cache for Lua values the value indexed by 'v' in ktable +** of the running pattern (if it is not there yet); returns its index. +*/ +static int updatecache (CapState *cs, int v) { + int idx = cs->ptop + 1; /* stack index of cache for Lua values */ + if (v != cs->valuecached) { /* not there? */ + getfromktable(cs, v); /* get value from 'ktable' */ + lua_replace(cs->L, idx); /* put it at reserved stack position */ + cs->valuecached = v; /* keep track of what is there */ + } + return idx; +} + + +static int pushcapture (CapState *cs); + + +/* +** Goes back in a list of captures looking for an open capture +** corresponding to a close +*/ +static Capture *findopen (Capture *cap) { + int n = 0; /* number of closes waiting an open */ + for (;;) { + cap--; + if (isclosecap(cap)) n++; /* one more open to skip */ + else if (!isfullcap(cap)) + if (n-- == 0) return cap; + } +} + + +/* +** Go to the next capture +*/ +static void nextcap (CapState *cs) { + Capture *cap = cs->cap; + if (!isfullcap(cap)) { /* not a single capture? */ + int n = 0; /* number of opens waiting a close */ + for (;;) { /* look for corresponding close */ + cap++; + if (isclosecap(cap)) { + if (n-- == 0) break; + } + else if (!isfullcap(cap)) n++; + } + } + cs->cap = cap + 1; /* + 1 to skip last close (or entire single capture) */ +} + + +/* +** Push on the Lua stack all values generated by nested captures inside +** the current capture. Returns number of values pushed. 'addextra' +** makes it push the entire match after all captured values. The +** entire match is pushed also if there are no other nested values, +** so the function never returns zero. +*/ +static int pushnestedvalues (CapState *cs, int addextra) { + Capture *co = cs->cap; + if (isfullcap(cs->cap++)) { /* no nested captures? */ + lua_pushlstring(cs->L, co->s, co->siz - 1); /* push whole match */ + return 1; /* that is it */ + } + else { + int n = 0; + while (!isclosecap(cs->cap)) /* repeat for all nested patterns */ + n += pushcapture(cs); + if (addextra || n == 0) { /* need extra? */ + lua_pushlstring(cs->L, co->s, cs->cap->s - co->s); /* push whole match */ + n++; + } + cs->cap++; /* skip close entry */ + return n; + } +} + + +/* +** Push only the first value generated by nested captures +*/ +static void pushonenestedvalue (CapState *cs) { + int n = pushnestedvalues(cs, 0); + if (n > 1) + lua_pop(cs->L, n - 1); /* pop extra values */ +} + + +/* +** Try to find a named group capture with the name given at the top of +** the stack; goes backward from 'cap'. +*/ +static Capture *findback (CapState *cs, Capture *cap) { + lua_State *L = cs->L; + while (cap-- > cs->ocap) { /* repeat until end of list */ + if (isclosecap(cap)) + cap = findopen(cap); /* skip nested captures */ + else if (!isfullcap(cap)) + continue; /* opening an enclosing capture: skip and get previous */ + if (captype(cap) == Cgroup) { + getfromktable(cs, cap->idx); /* get group name */ + if (lp_equal(L, -2, -1)) { /* right group? */ + lua_pop(L, 2); /* remove reference name and group name */ + return cap; + } + else lua_pop(L, 1); /* remove group name */ + } + } + luaL_error(L, "back reference '%s' not found", lua_tostring(L, -1)); + return NULL; /* to avoid warnings */ +} + + +/* +** Back-reference capture. Return number of values pushed. +*/ +static int backrefcap (CapState *cs) { + int n; + Capture *curr = cs->cap; + pushluaval(cs); /* reference name */ + cs->cap = findback(cs, curr); /* find corresponding group */ + n = pushnestedvalues(cs, 0); /* push group's values */ + cs->cap = curr + 1; + return n; +} + + +/* +** Table capture: creates a new table and populates it with nested +** captures. +*/ +static int tablecap (CapState *cs) { + lua_State *L = cs->L; + int n = 0; + lua_newtable(L); + if (isfullcap(cs->cap++)) + return 1; /* table is empty */ + while (!isclosecap(cs->cap)) { + if (captype(cs->cap) == Cgroup && cs->cap->idx != 0) { /* named group? */ + pushluaval(cs); /* push group name */ + pushonenestedvalue(cs); + lua_settable(L, -3); + } + else { /* not a named group */ + int i; + int k = pushcapture(cs); + for (i = k; i > 0; i--) /* store all values into table */ + lua_rawseti(L, -(i + 1), n + i); + n += k; + } + } + cs->cap++; /* skip close entry */ + return 1; /* number of values pushed (only the table) */ +} + + +/* +** Table-query capture +*/ +static int querycap (CapState *cs) { + int idx = cs->cap->idx; + pushonenestedvalue(cs); /* get nested capture */ + lua_gettable(cs->L, updatecache(cs, idx)); /* query cap. value at table */ + if (!lua_isnil(cs->L, -1)) + return 1; + else { /* no value */ + lua_pop(cs->L, 1); /* remove nil */ + return 0; + } +} + + +/* +** Fold capture +*/ +static int foldcap (CapState *cs) { + int n; + lua_State *L = cs->L; + int idx = cs->cap->idx; + if (isfullcap(cs->cap++) || /* no nested captures? */ + isclosecap(cs->cap) || /* no nested captures (large subject)? */ + (n = pushcapture(cs)) == 0) /* nested captures with no values? */ + return luaL_error(L, "no initial value for fold capture"); + if (n > 1) + lua_pop(L, n - 1); /* leave only one result for accumulator */ + while (!isclosecap(cs->cap)) { + lua_pushvalue(L, updatecache(cs, idx)); /* get folding function */ + lua_insert(L, -2); /* put it before accumulator */ + n = pushcapture(cs); /* get next capture's values */ + lua_call(L, n + 1, 1); /* call folding function */ + } + cs->cap++; /* skip close entry */ + return 1; /* only accumulator left on the stack */ +} + + +/* +** Function capture +*/ +static int functioncap (CapState *cs) { + int n; + int top = lua_gettop(cs->L); + pushluaval(cs); /* push function */ + n = pushnestedvalues(cs, 0); /* push nested captures */ + lua_call(cs->L, n, LUA_MULTRET); /* call function */ + return lua_gettop(cs->L) - top; /* return function's results */ +} + + +/* +** Select capture +*/ +static int numcap (CapState *cs) { + int idx = cs->cap->idx; /* value to select */ + if (idx == 0) { /* no values? */ + nextcap(cs); /* skip entire capture */ + return 0; /* no value produced */ + } + else { + int n = pushnestedvalues(cs, 0); + if (n < idx) /* invalid index? */ + return luaL_error(cs->L, "no capture '%d'", idx); + else { + lua_pushvalue(cs->L, -(n - idx + 1)); /* get selected capture */ + lua_replace(cs->L, -(n + 1)); /* put it in place of 1st capture */ + lua_pop(cs->L, n - 1); /* remove other captures */ + return 1; + } + } +} + + +/* +** Return the stack index of the first runtime capture in the given +** list of captures (or zero if no runtime captures) +*/ +int finddyncap (Capture *cap, Capture *last) { + for (; cap < last; cap++) { + if (cap->kind == Cruntime) + return cap->idx; /* stack position of first capture */ + } + return 0; /* no dynamic captures in this segment */ +} + + +/* +** Calls a runtime capture. Returns number of captures removed by +** the call, including the initial Cgroup. (Captures to be added are +** on the Lua stack.) +*/ +int runtimecap (CapState *cs, Capture *close, const char *s, int *rem) { + int n, id; + lua_State *L = cs->L; + int otop = lua_gettop(L); + Capture *open = findopen(close); + assert(captype(open) == Cgroup); + id = finddyncap(open, close); /* get first dynamic capture argument */ + close->kind = Cclose; /* closes the group */ + close->s = s; + cs->cap = open; cs->valuecached = 0; /* prepare capture state */ + luaL_checkstack(L, 4, "too many runtime captures"); + pushluaval(cs); /* push function to be called */ + lua_pushvalue(L, SUBJIDX); /* push original subject */ + lua_pushinteger(L, s - cs->s + 1); /* push current position */ + n = pushnestedvalues(cs, 0); /* push nested captures */ + lua_call(L, n + 2, LUA_MULTRET); /* call dynamic function */ + if (id > 0) { /* are there old dynamic captures to be removed? */ + int i; + for (i = id; i <= otop; i++) + lua_remove(L, id); /* remove old dynamic captures */ + *rem = otop - id + 1; /* total number of dynamic captures removed */ + } + else + *rem = 0; /* no dynamic captures removed */ + return close - open; /* number of captures of all kinds removed */ +} + + +/* +** Auxiliary structure for substitution and string captures: keep +** information about nested captures for future use, avoiding to push +** string results into Lua +*/ +typedef struct StrAux { + int isstring; /* whether capture is a string */ + union { + Capture *cp; /* if not a string, respective capture */ + struct { /* if it is a string... */ + const char *s; /* ... starts here */ + const char *e; /* ... ends here */ + } s; + } u; +} StrAux; + +#define MAXSTRCAPS 10 + +/* +** Collect values from current capture into array 'cps'. Current +** capture must be Cstring (first call) or Csimple (recursive calls). +** (In first call, fills %0 with whole match for Cstring.) +** Returns number of elements in the array that were filled. +*/ +static int getstrcaps (CapState *cs, StrAux *cps, int n) { + int k = n++; + cps[k].isstring = 1; /* get string value */ + cps[k].u.s.s = cs->cap->s; /* starts here */ + if (!isfullcap(cs->cap++)) { /* nested captures? */ + while (!isclosecap(cs->cap)) { /* traverse them */ + if (n >= MAXSTRCAPS) /* too many captures? */ + nextcap(cs); /* skip extra captures (will not need them) */ + else if (captype(cs->cap) == Csimple) /* string? */ + n = getstrcaps(cs, cps, n); /* put info. into array */ + else { + cps[n].isstring = 0; /* not a string */ + cps[n].u.cp = cs->cap; /* keep original capture */ + nextcap(cs); + n++; + } + } + cs->cap++; /* skip close */ + } + cps[k].u.s.e = closeaddr(cs->cap - 1); /* ends here */ + return n; +} + + +/* +** add next capture value (which should be a string) to buffer 'b' +*/ +static int addonestring (luaL_Buffer *b, CapState *cs, const char *what); + + +/* +** String capture: add result to buffer 'b' (instead of pushing +** it into the stack) +*/ +static void stringcap (luaL_Buffer *b, CapState *cs) { + StrAux cps[MAXSTRCAPS]; + int n; + size_t len, i; + const char *fmt; /* format string */ + fmt = lua_tolstring(cs->L, updatecache(cs, cs->cap->idx), &len); + n = getstrcaps(cs, cps, 0) - 1; /* collect nested captures */ + for (i = 0; i < len; i++) { /* traverse them */ + if (fmt[i] != '%') /* not an escape? */ + luaL_addchar(b, fmt[i]); /* add it to buffer */ + else if (fmt[++i] < '0' || fmt[i] > '9') /* not followed by a digit? */ + luaL_addchar(b, fmt[i]); /* add to buffer */ + else { + int l = fmt[i] - '0'; /* capture index */ + if (l > n) + luaL_error(cs->L, "invalid capture index (%d)", l); + else if (cps[l].isstring) + luaL_addlstring(b, cps[l].u.s.s, cps[l].u.s.e - cps[l].u.s.s); + else { + Capture *curr = cs->cap; + cs->cap = cps[l].u.cp; /* go back to evaluate that nested capture */ + if (!addonestring(b, cs, "capture")) + luaL_error(cs->L, "no values in capture index %d", l); + cs->cap = curr; /* continue from where it stopped */ + } + } + } +} + + +/* +** Substitution capture: add result to buffer 'b' +*/ +static void substcap (luaL_Buffer *b, CapState *cs) { + const char *curr = cs->cap->s; + if (isfullcap(cs->cap)) /* no nested captures? */ + luaL_addlstring(b, curr, cs->cap->siz - 1); /* keep original text */ + else { + cs->cap++; /* skip open entry */ + while (!isclosecap(cs->cap)) { /* traverse nested captures */ + const char *next = cs->cap->s; + luaL_addlstring(b, curr, next - curr); /* add text up to capture */ + if (addonestring(b, cs, "replacement")) + curr = closeaddr(cs->cap - 1); /* continue after match */ + else /* no capture value */ + curr = next; /* keep original text in final result */ + } + luaL_addlstring(b, curr, cs->cap->s - curr); /* add last piece of text */ + } + cs->cap++; /* go to next capture */ +} + + +/* +** Evaluates a capture and adds its first value to buffer 'b'; returns +** whether there was a value +*/ +static int addonestring (luaL_Buffer *b, CapState *cs, const char *what) { + switch (captype(cs->cap)) { + case Cstring: + stringcap(b, cs); /* add capture directly to buffer */ + return 1; + case Csubst: + substcap(b, cs); /* add capture directly to buffer */ + return 1; + default: { + lua_State *L = cs->L; + int n = pushcapture(cs); + if (n > 0) { + if (n > 1) lua_pop(L, n - 1); /* only one result */ + if (!lua_isstring(L, -1)) + luaL_error(L, "invalid %s value (a %s)", what, luaL_typename(L, -1)); + luaL_addvalue(b); + } + return n; + } + } +} + + +/* +** Push all values of the current capture into the stack; returns +** number of values pushed +*/ +static int pushcapture (CapState *cs) { + lua_State *L = cs->L; + luaL_checkstack(L, 4, "too many captures"); + switch (captype(cs->cap)) { + case Cposition: { + lua_pushinteger(L, cs->cap->s - cs->s + 1); + cs->cap++; + return 1; + } + case Cconst: { + pushluaval(cs); + cs->cap++; + return 1; + } + case Carg: { + int arg = (cs->cap++)->idx; + if (arg + FIXEDARGS > cs->ptop) + return luaL_error(L, "reference to absent extra argument #%d", arg); + lua_pushvalue(L, arg + FIXEDARGS); + return 1; + } + case Csimple: { + int k = pushnestedvalues(cs, 1); + lua_insert(L, -k); /* make whole match be first result */ + return k; + } + case Cruntime: { + lua_pushvalue(L, (cs->cap++)->idx); /* value is in the stack */ + return 1; + } + case Cstring: { + luaL_Buffer b; + luaL_buffinit(L, &b); + stringcap(&b, cs); + luaL_pushresult(&b); + return 1; + } + case Csubst: { + luaL_Buffer b; + luaL_buffinit(L, &b); + substcap(&b, cs); + luaL_pushresult(&b); + return 1; + } + case Cgroup: { + if (cs->cap->idx == 0) /* anonymous group? */ + return pushnestedvalues(cs, 0); /* add all nested values */ + else { /* named group: add no values */ + nextcap(cs); /* skip capture */ + return 0; + } + } + case Cbackref: return backrefcap(cs); + case Ctable: return tablecap(cs); + case Cfunction: return functioncap(cs); + case Cnum: return numcap(cs); + case Cquery: return querycap(cs); + case Cfold: return foldcap(cs); + default: assert(0); return 0; + } +} + + +/* +** Prepare a CapState structure and traverse the entire list of +** captures in the stack pushing its results. 's' is the subject +** string, 'r' is the final position of the match, and 'ptop' +** the index in the stack where some useful values were pushed. +** Returns the number of results pushed. (If the list produces no +** results, push the final position of the match.) +*/ +int getcaptures (lua_State *L, const char *s, const char *r, int ptop) { + Capture *capture = (Capture *)lua_touserdata(L, caplistidx(ptop)); + int n = 0; + if (!isclosecap(capture)) { /* is there any capture? */ + CapState cs; + cs.ocap = cs.cap = capture; cs.L = L; + cs.s = s; cs.valuecached = 0; cs.ptop = ptop; + do { /* collect their values */ + n += pushcapture(&cs); + } while (!isclosecap(cs.cap)); + } + if (n == 0) { /* no capture values? */ + lua_pushinteger(L, r - s + 1); /* return only end position */ + n = 1; + } + return n; +} + + diff --git a/06/lpeglabel/lpcap.h b/06/lpeglabel/lpcap.h new file mode 100644 index 0000000..d762fdc --- /dev/null +++ b/06/lpeglabel/lpcap.h @@ -0,0 +1,43 @@ +/* +** $Id: lpcap.h,v 1.2 2015/02/27 17:13:17 roberto Exp $ +*/ + +#if !defined(lpcap_h) +#define lpcap_h + + +#include "lptypes.h" + + +/* kinds of captures */ +typedef enum CapKind { + Cclose, Cposition, Cconst, Cbackref, Carg, Csimple, Ctable, Cfunction, + Cquery, Cstring, Cnum, Csubst, Cfold, Cruntime, Cgroup +} CapKind; + + +typedef struct Capture { + const char *s; /* subject position */ + unsigned short idx; /* extra info (group name, arg index, etc.) */ + byte kind; /* kind of capture */ + byte siz; /* size of full capture + 1 (0 = not a full capture) */ +} Capture; + + +typedef struct CapState { + Capture *cap; /* current capture */ + Capture *ocap; /* (original) capture list */ + lua_State *L; + int ptop; /* index of last argument to 'match' */ + const char *s; /* original string */ + int valuecached; /* value stored in cache slot */ +} CapState; + + +int runtimecap (CapState *cs, Capture *close, const char *s, int *rem); +int getcaptures (lua_State *L, const char *s, const char *r, int ptop); +int finddyncap (Capture *cap, Capture *last); + +#endif + + diff --git a/06/lpeglabel/lpcode.c b/06/lpeglabel/lpcode.c new file mode 100644 index 0000000..b2dbba2 --- /dev/null +++ b/06/lpeglabel/lpcode.c @@ -0,0 +1,1035 @@ +/* +** $Id: lpcode.c,v 1.23 2015/06/12 18:36:47 roberto Exp $ +** Copyright 2007, Lua.org & PUC-Rio (see 'lpeg.html' for license) +*/ + +#include + + +#include "lua.h" +#include "lauxlib.h" + +#include "lptypes.h" +#include "lpcode.h" + + +/* signals a "no-instruction */ +#define NOINST -1 + + + +static const Charset fullset_ = + {{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, + 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, + 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, + 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}}; + +static const Charset *fullset = &fullset_; + +/* +** {====================================================== +** Analysis and some optimizations +** ======================================================= +*/ + +/* +** Check whether a charset is empty (returns IFail), singleton (IChar), +** full (IAny), or none of those (ISet). When singleton, '*c' returns +** which character it is. (When generic set, the set was the input, +** so there is no need to return it.) +*/ +static Opcode charsettype (const byte *cs, int *c) { + int count = 0; /* number of characters in the set */ + int i; + int candidate = -1; /* candidate position for the singleton char */ + for (i = 0; i < CHARSETSIZE; i++) { /* for each byte */ + int b = cs[i]; + if (b == 0) { /* is byte empty? */ + if (count > 1) /* was set neither empty nor singleton? */ + return ISet; /* neither full nor empty nor singleton */ + /* else set is still empty or singleton */ + } + else if (b == 0xFF) { /* is byte full? */ + if (count < (i * BITSPERCHAR)) /* was set not full? */ + return ISet; /* neither full nor empty nor singleton */ + else count += BITSPERCHAR; /* set is still full */ + } + else if ((b & (b - 1)) == 0) { /* has byte only one bit? */ + if (count > 0) /* was set not empty? */ + return ISet; /* neither full nor empty nor singleton */ + else { /* set has only one char till now; track it */ + count++; + candidate = i; + } + } + else return ISet; /* byte is neither empty, full, nor singleton */ + } + switch (count) { + case 0: return IFail; /* empty set */ + case 1: { /* singleton; find character bit inside byte */ + int b = cs[candidate]; + *c = candidate * BITSPERCHAR; + if ((b & 0xF0) != 0) { *c += 4; b >>= 4; } + if ((b & 0x0C) != 0) { *c += 2; b >>= 2; } + if ((b & 0x02) != 0) { *c += 1; } + return IChar; + } + default: { + assert(count == CHARSETSIZE * BITSPERCHAR); /* full set */ + return IAny; + } + } +} + + +/* +** A few basic operations on Charsets +*/ +static void cs_complement (Charset *cs) { + loopset(i, cs->cs[i] = ~cs->cs[i]); +} + +static int cs_equal (const byte *cs1, const byte *cs2) { + loopset(i, if (cs1[i] != cs2[i]) return 0); + return 1; +} + +static int cs_disjoint (const Charset *cs1, const Charset *cs2) { + loopset(i, if ((cs1->cs[i] & cs2->cs[i]) != 0) return 0;) + return 1; +} + + +/* +** If 'tree' is a 'char' pattern (TSet, TChar, TAny), convert it into a +** charset and return 1; else return 0. +*/ +int tocharset (TTree *tree, Charset *cs) { + switch (tree->tag) { + case TSet: { /* copy set */ + loopset(i, cs->cs[i] = treebuffer(tree)[i]); + return 1; + } + case TChar: { /* only one char */ + assert(0 <= tree->u.n && tree->u.n <= UCHAR_MAX); + loopset(i, cs->cs[i] = 0); /* erase all chars */ + setchar(cs->cs, tree->u.n); /* add that one */ + return 1; + } + case TAny: { + loopset(i, cs->cs[i] = 0xFF); /* add all characters to the set */ + return 1; + } + default: return 0; + } +} + + +/* +** Check whether a pattern tree has captures +*/ +int hascaptures (TTree *tree) { + tailcall: + switch (tree->tag) { + case TCapture: case TRunTime: + return 1; + case TCall: + tree = sib2(tree); goto tailcall; /* return hascaptures(sib2(tree)); */ + case TOpenCall: assert(0); + default: { + switch (numsiblings[tree->tag]) { + case 1: /* return hascaptures(sib1(tree)); */ + tree = sib1(tree); goto tailcall; + case 2: + if (hascaptures(sib1(tree))) return 1; + /* else return hascaptures(sib2(tree)); */ + tree = sib2(tree); goto tailcall; + default: assert(numsiblings[tree->tag] == 0); return 0; + } + } + } +} + + +/* +** Checks how a pattern behaves regarding the empty string, +** in one of two different ways: +** A pattern is *nullable* if it can match without consuming any character; +** A pattern is *nofail* if it never fails for any string +** (including the empty string). +** The difference is only for predicates and run-time captures; +** for other patterns, the two properties are equivalent. +** (With predicates, &'a' is nullable but not nofail. Of course, +** nofail => nullable.) +** These functions are all convervative in the following way: +** p is nullable => nullable(p) +** nofail(p) => p cannot fail +** The function assumes that TOpenCall is not nullable; +** this will be checked again when the grammar is fixed. +** Run-time captures can do whatever they want, so the result +** is conservative. +*/ +int checkaux (TTree *tree, int pred) { + tailcall: + switch (tree->tag) { + case TChar: case TSet: case TAny: + case TFalse: case TOpenCall: case TThrow: /* labeled failure */ + return 0; /* not nullable */ + case TRep: case TTrue: + return 1; /* no fail */ + case TNot: case TBehind: /* can match empty, but can fail */ + if (pred == PEnofail) return 0; + else return 1; /* PEnullable */ + case TAnd: /* can match empty; fail iff body does */ + if (pred == PEnullable) return 1; + /* else return checkaux(sib1(tree), pred); */ + tree = sib1(tree); goto tailcall; + case TRunTime: /* can fail; match empty iff body does */ + if (pred == PEnofail) return 0; + /* else return checkaux(sib1(tree), pred); */ + tree = sib1(tree); goto tailcall; + case TSeq: + if (!checkaux(sib1(tree), pred)) return 0; + /* else return checkaux(sib2(tree), pred); */ + tree = sib2(tree); goto tailcall; + case TChoice: + if (checkaux(sib2(tree), pred)) return 1; + /* else return checkaux(sib1(tree), pred); */ + tree = sib1(tree); goto tailcall; + case TRecov: /* labeled failure */ + /* we do not know whether sib2 will be evaluated */ + tree = sib1(tree); goto tailcall; + case TCapture: case TGrammar: case TRule: + /* return checkaux(sib1(tree), pred); */ + tree = sib1(tree); goto tailcall; + case TCall: /* return checkaux(sib2(tree), pred); */ + tree = sib2(tree); goto tailcall; + default: assert(0); return 0; + } +} + + +/* +** number of characters to match a pattern (or -1 if variable) +** ('count' avoids infinite loops for grammars) +*/ +int fixedlenx (TTree *tree, int count, int len) { + tailcall: + switch (tree->tag) { + case TChar: case TSet: case TAny: + return len + 1; + case TFalse: case TTrue: case TNot: case TAnd: case TBehind: + return len; + case TRep: case TRunTime: case TOpenCall: + case TThrow: /* labeled failure */ + return -1; + case TCapture: case TRule: case TGrammar: + /* return fixedlenx(sib1(tree), count); */ + tree = sib1(tree); goto tailcall; + case TCall: + if (count++ >= MAXRULES) + return -1; /* may be a loop */ + /* else return fixedlenx(sib2(tree), count); */ + tree = sib2(tree); goto tailcall; + case TSeq: case TRecov: { /* labeled failure */ + len = fixedlenx(sib1(tree), count, len); + if (len < 0) return -1; + /* else return fixedlenx(sib2(tree), count, len); */ + tree = sib2(tree); goto tailcall; + } + case TChoice: { + int n1, n2; + n1 = fixedlenx(sib1(tree), count, len); + if (n1 < 0) return -1; + n2 = fixedlenx(sib2(tree), count, len); + if (n1 == n2) return n1; + else return -1; + } + default: assert(0); return 0; + }; +} + + +/* +** Computes the 'first set' of a pattern. +** The result is a conservative aproximation: +** match p ax -> x (for some x) ==> a belongs to first(p) +** or +** a not in first(p) ==> match p ax -> fail (for all x) +** +** The set 'follow' is the first set of what follows the +** pattern (full set if nothing follows it). +** +** The function returns 0 when this resulting set can be used for +** test instructions that avoid the pattern altogether. +** A non-zero return can happen for two reasons: +** 1) match p '' -> '' ==> return has bit 1 set +** (tests cannot be used because they would always fail for an empty input); +** 2) there is a match-time capture ==> return has bit 2 set +** (optimizations should not bypass match-time captures). +*/ +static int getfirst (TTree *tree, const Charset *follow, Charset *firstset) { + tailcall: + switch (tree->tag) { + case TChar: case TSet: case TAny: { + tocharset(tree, firstset); + return 0; + } + case TTrue: { + loopset(i, firstset->cs[i] = follow->cs[i]); + return 1; /* accepts the empty string */ + } + case TFalse: { + loopset(i, firstset->cs[i] = 0); + return 0; + } + case TThrow: { /* labeled failure: must always throw the label */ + loopset(i, firstset->cs[i] = follow->cs[i]); /* follow = fullset(?) */ + return 1; + } + case TChoice: { + Charset csaux; + int e1 = getfirst(sib1(tree), follow, firstset); + int e2 = getfirst(sib2(tree), follow, &csaux); + loopset(i, firstset->cs[i] |= csaux.cs[i]); + return e1 | e2; + } + case TRecov: { /* labeled failure */ + /* when p1 is not nullable, p2 has nothing to contribute; + and when p1 is nullable, then p2 will not match + return getfirst(sib1(tree), fullset, firstset); */ + tree = sib1(tree); follow = fullset; goto tailcall; + } + case TSeq: { + if (!nullable(sib1(tree))) { + /* when p1 is not nullable, p2 has nothing to contribute; + return getfirst(sib1(tree), fullset, firstset); */ + tree = sib1(tree); follow = fullset; goto tailcall; + } + else { /* FIRST(p1 p2, fl) = FIRST(p1, FIRST(p2, fl)) */ + Charset csaux; + int e2 = getfirst(sib2(tree), follow, &csaux); + int e1 = getfirst(sib1(tree), &csaux, firstset); + if (e1 == 0) return 0; /* 'e1' ensures that first can be used */ + else if ((e1 | e2) & 2) /* one of the children has a matchtime? */ + return 2; /* pattern has a matchtime capture */ + else return e2; /* else depends on 'e2' */ + } + } + case TRep: { + getfirst(sib1(tree), follow, firstset); + loopset(i, firstset->cs[i] |= follow->cs[i]); + return 1; /* accept the empty string */ + } + case TCapture: case TGrammar: case TRule: { + /* return getfirst(sib1(tree), follow, firstset); */ + tree = sib1(tree); goto tailcall; + } + case TRunTime: { /* function invalidates any follow info. */ + int e = getfirst(sib1(tree), fullset, firstset); + if (e) return 2; /* function is not "protected"? */ + else return 0; /* pattern inside capture ensures first can be used */ + } + case TCall: { + /* return getfirst(sib2(tree), follow, firstset); */ + tree = sib2(tree); goto tailcall; + } + case TAnd: { + int e = getfirst(sib1(tree), follow, firstset); + loopset(i, firstset->cs[i] &= follow->cs[i]); + return e; + } + case TNot: { + if (tocharset(sib1(tree), firstset)) { + cs_complement(firstset); + return 1; + } + /* else go through */ + } + case TBehind: { /* instruction gives no new information */ + /* call 'getfirst' only to check for math-time captures */ + int e = getfirst(sib1(tree), follow, firstset); + loopset(i, firstset->cs[i] = follow->cs[i]); /* uses follow */ + return e | 1; /* always can accept the empty string */ + } + default: assert(0); return 0; + } +} + + +/* +** If 'headfail(tree)' true, then 'tree' can fail only depending on the +** next character of the subject. +*/ +static int headfail (TTree *tree) { + tailcall: + switch (tree->tag) { + case TChar: case TSet: case TAny: case TFalse: + return 1; + case TTrue: case TRep: case TRunTime: case TNot: + case TBehind: + case TThrow: /* labeled failure: must always throw the label */ + return 0; + case TCapture: case TGrammar: case TRule: case TAnd: + tree = sib1(tree); goto tailcall; /* return headfail(sib1(tree)); */ + case TCall: + tree = sib2(tree); goto tailcall; /* return headfail(sib2(tree)); */ + case TSeq: + if (!nofail(sib2(tree))) return 0; + /* else return headfail(sib1(tree)); */ + tree = sib1(tree); goto tailcall; + case TChoice: case TRecov: /* labeled failure */ + if (!headfail(sib1(tree))) return 0; + /* else return headfail(sib2(tree)); */ + tree = sib2(tree); goto tailcall; + default: assert(0); return 0; + } +} + + +/* +** Check whether the code generation for the given tree can benefit +** from a follow set (to avoid computing the follow set when it is +** not needed) +*/ +static int needfollow (TTree *tree) { + tailcall: + switch (tree->tag) { + case TChar: case TSet: case TAny: + case TFalse: case TTrue: case TAnd: case TNot: + case TRunTime: case TGrammar: case TCall: case TBehind: + case TThrow: case TRecov: /* (?)labeled failure */ + return 0; + case TChoice: case TRep: + return 1; + case TCapture: + tree = sib1(tree); goto tailcall; + case TSeq: + tree = sib2(tree); goto tailcall; + default: assert(0); return 0; + } +} + +/* }====================================================== */ + + + +/* +** {====================================================== +** Code generation +** ======================================================= +*/ + + +/* +** size of an instruction +*/ +int sizei (const Instruction *i) { + switch((Opcode)i->i.code) { + case ISet: case ISpan: return CHARSETINSTSIZE; + case ITestSet: return CHARSETINSTSIZE + 1; + case ITestChar: case ITestAny: case IChoice: case IJmp: case ICall: + case IOpenCall: case ICommit: case IPartialCommit: case IBackCommit: + return 2; + case IThrow: /* labeled failure */ + return 1; + case IRecov: + return (CHARSETINSTSIZE - 1) + 2; /* labeled failure */ + default: return 1; + } +} + + +/* +** state for the compiler +*/ +typedef struct CompileState { + Pattern *p; /* pattern being compiled */ + int ncode; /* next position in p->code to be filled */ + lua_State *L; +} CompileState; + + +/* +** code generation is recursive; 'opt' indicates that the code is being +** generated as the last thing inside an optional pattern (so, if that +** code is optional too, it can reuse the 'IChoice' already in place for +** the outer pattern). 'tt' points to a previous test protecting this +** code (or NOINST). 'fl' is the follow set of the pattern. +*/ +static void codegen (CompileState *compst, TTree *tree, int opt, int tt, + const Charset *fl); + + +void realloccode (lua_State *L, Pattern *p, int nsize) { + void *ud; + lua_Alloc f = lua_getallocf(L, &ud); + void *newblock = f(ud, p->code, p->codesize * sizeof(Instruction), + nsize * sizeof(Instruction)); + if (newblock == NULL && nsize > 0) + luaL_error(L, "not enough memory"); + p->code = (Instruction *)newblock; + p->codesize = nsize; +} + + +static int nextinstruction (CompileState *compst) { + int size = compst->p->codesize; + if (compst->ncode >= size) + realloccode(compst->L, compst->p, size * 2); + return compst->ncode++; +} + + +#define getinstr(cs,i) ((cs)->p->code[i]) + + +static int addinstruction (CompileState *compst, Opcode op, int aux) { + int i = nextinstruction(compst); + getinstr(compst, i).i.code = op; + getinstr(compst, i).i.aux = aux; + return i; +} + + +/* +** Add an instruction followed by space for an offset (to be set later) +*/ +static int addoffsetinst (CompileState *compst, Opcode op) { + int i = addinstruction(compst, op, 0); /* instruction */ + addinstruction(compst, (Opcode)0, 0); /* open space for offset */ + assert(op == ITestSet || sizei(&getinstr(compst, i)) == 2 || + op == IRecov); /* labeled failure */ + return i; +} + + +/* +** Set the offset of an instruction +*/ +static void setoffset (CompileState *compst, int instruction, int offset) { + getinstr(compst, instruction + 1).offset = offset; +} + + +/* +** Add a capture instruction: +** 'op' is the capture instruction; 'cap' the capture kind; +** 'key' the key into ktable; 'aux' is the optional capture offset +** +*/ +static int addinstcap (CompileState *compst, Opcode op, int cap, int key, + int aux) { + int i = addinstruction(compst, op, joinkindoff(cap, aux)); + getinstr(compst, i).i.key = key; + return i; +} + + +#define gethere(compst) ((compst)->ncode) + +#define target(code,i) ((i) + code[i + 1].offset) + + +/* +** Patch 'instruction' to jump to 'target' +*/ +static void jumptothere (CompileState *compst, int instruction, int target) { + if (instruction >= 0) + setoffset(compst, instruction, target - instruction); +} + + +/* +** Patch 'instruction' to jump to current position +*/ +static void jumptohere (CompileState *compst, int instruction) { + jumptothere(compst, instruction, gethere(compst)); +} + + +/* +** Code an IChar instruction, or IAny if there is an equivalent +** test dominating it +*/ +static void codechar (CompileState *compst, int c, int tt) { + if (tt >= 0 && getinstr(compst, tt).i.code == ITestChar && + getinstr(compst, tt).i.aux == c) + addinstruction(compst, IAny, 0); + else + addinstruction(compst, IChar, c); +} + + +/* +** Add a charset posfix to an instruction +*/ +static void addcharset (CompileState *compst, const byte *cs) { + int p = gethere(compst); + int i; + for (i = 0; i < (int)CHARSETINSTSIZE - 1; i++) + nextinstruction(compst); /* space for buffer */ + /* fill buffer with charset */ + loopset(j, getinstr(compst, p).buff[j] = cs[j]); +} + + +/* +** code a char set, optimizing unit sets for IChar, "complete" +** sets for IAny, and empty sets for IFail; also use an IAny +** when instruction is dominated by an equivalent test. +*/ +static void codecharset (CompileState *compst, const byte *cs, int tt) { + int c = 0; /* (=) to avoid warnings */ + Opcode op = charsettype(cs, &c); + switch (op) { + case IChar: codechar(compst, c, tt); break; + case ISet: { /* non-trivial set? */ + if (tt >= 0 && getinstr(compst, tt).i.code == ITestSet && + cs_equal(cs, getinstr(compst, tt + 2).buff)) + addinstruction(compst, IAny, 0); + else { + addinstruction(compst, ISet, 0); + addcharset(compst, cs); + } + break; + } + default: addinstruction(compst, op, c); break; + } +} + + +/* +** code a test set, optimizing unit sets for ITestChar, "complete" +** sets for ITestAny, and empty sets for IJmp (always fails). +** 'e' is true iff test should accept the empty string. (Test +** instructions in the current VM never accept the empty string.) +*/ +static int codetestset (CompileState *compst, Charset *cs, int e) { + if (e) return NOINST; /* no test */ + else { + int c = 0; + Opcode op = charsettype(cs->cs, &c); + switch (op) { + case IFail: return addoffsetinst(compst, IJmp); /* always jump */ + case IAny: return addoffsetinst(compst, ITestAny); + case IChar: { + int i = addoffsetinst(compst, ITestChar); + getinstr(compst, i).i.aux = c; + return i; + } + case ISet: { + int i = addoffsetinst(compst, ITestSet); + addcharset(compst, cs->cs); + return i; + } + default: assert(0); return 0; + } + } +} + + +/* +** Find the final destination of a sequence of jumps +*/ +static int finaltarget (Instruction *code, int i) { + while (code[i].i.code == IJmp) + i = target(code, i); + return i; +} + + +/* +** final label (after traversing any jumps) +*/ +static int finallabel (Instruction *code, int i) { + return finaltarget(code, target(code, i)); +} + + +/* +** == behind n;

(where n = fixedlen(p)) +*/ +static void codebehind (CompileState *compst, TTree *tree) { + if (tree->u.n > 0) + addinstruction(compst, IBehind, tree->u.n); + codegen(compst, sib1(tree), 0, NOINST, fullset); +} + + +/* +** Choice; optimizations: +** - when p1 is headfail or +** when first(p1) and first(p2) are disjoint, than +** a character not in first(p1) cannot go to p1, and a character +** in first(p1) cannot go to p2 (at it is not in first(p2)). +** (The optimization is not valid if p1 accepts the empty string, +** as then there is no character at all...) +** - when p2 is empty and opt is true; a IPartialCommit can reuse +** the Choice already active in the stack. +*/ +static void codechoice (CompileState *compst, TTree *p1, TTree *p2, int opt, + const Charset *fl) { + int emptyp2 = (p2->tag == TTrue); + Charset cs1, cs2; + int e1 = getfirst(p1, fullset, &cs1); + if (headfail(p1) || + (!e1 && (getfirst(p2, fl, &cs2), cs_disjoint(&cs1, &cs2)))) { + /* == test (fail(p1)) -> L1 ; p1 ; jmp L2; L1: p2; L2: */ + int test = codetestset(compst, &cs1, 0); + int jmp = NOINST; + codegen(compst, p1, 0, test, fl); + if (!emptyp2) + jmp = addoffsetinst(compst, IJmp); + jumptohere(compst, test); + codegen(compst, p2, opt, NOINST, fl); + jumptohere(compst, jmp); + } + else if (opt && emptyp2) { + /* p1? == IPartialCommit; p1 */ + jumptohere(compst, addoffsetinst(compst, IPartialCommit)); + codegen(compst, p1, 1, NOINST, fullset); + } + else { + /* == + test(first(p1)) -> L1; choice L1; ; commit L2; L1: ; L2: */ + int pcommit; + int test = codetestset(compst, &cs1, e1); + int pchoice = addoffsetinst(compst, IChoice); + codegen(compst, p1, emptyp2, test, fullset); + pcommit = addoffsetinst(compst, ICommit); + jumptohere(compst, pchoice); + jumptohere(compst, test); + codegen(compst, p2, opt, NOINST, fl); + jumptohere(compst, pcommit); + } +} + + +/* labeled failure begin */ +static void coderecovery (CompileState *compst, TTree *p1, TTree *p2, int opt, + const Charset *fl, const byte *cs) { + int emptyp2 = (p2->tag == TTrue); + int pcommit; + int test = NOINST; + int precovery = addoffsetinst(compst, IRecov); + addcharset(compst, cs); + codegen(compst, p1, emptyp2, test, fullset); + pcommit = addoffsetinst(compst, ICommit); + jumptohere(compst, precovery); + jumptohere(compst, test); + codegen(compst, p2, opt, NOINST, fl); + addinstruction(compst, IRet, 0); + jumptohere(compst, pcommit); +} +/* labeled failure end */ + + +/* +** And predicate +** optimization: fixedlen(p) = n ==> <&p> ==

; behind n +** (valid only when 'p' has no captures) +*/ +static void codeand (CompileState *compst, TTree *tree, int tt) { + int n = fixedlen(tree); + if (n >= 0 && n <= MAXBEHIND && !hascaptures(tree)) { + codegen(compst, tree, 0, tt, fullset); + if (n > 0) + addinstruction(compst, IBehind, n); + } + else { /* default: Choice L1; p1; BackCommit L2; L1: Fail; L2: */ + int pcommit; + int pchoice = addoffsetinst(compst, IChoice); + codegen(compst, tree, 0, tt, fullset); + pcommit = addoffsetinst(compst, IBackCommit); + jumptohere(compst, pchoice); + addinstruction(compst, IFail, 0); + jumptohere(compst, pcommit); + } +} + + +/* +** Captures: if pattern has fixed (and not too big) length, use +** a single IFullCapture instruction after the match; otherwise, +** enclose the pattern with OpenCapture - CloseCapture. +*/ +static void codecapture (CompileState *compst, TTree *tree, int tt, + const Charset *fl) { + int len = fixedlen(sib1(tree)); + if (len >= 0 && len <= MAXOFF && !hascaptures(sib1(tree))) { + codegen(compst, sib1(tree), 0, tt, fl); + addinstcap(compst, IFullCapture, tree->cap, tree->key, len); + } + else { + addinstcap(compst, IOpenCapture, tree->cap, tree->key, 0); + codegen(compst, sib1(tree), 0, tt, fl); + addinstcap(compst, ICloseCapture, Cclose, 0, 0); + } +} + + +static void coderuntime (CompileState *compst, TTree *tree, int tt) { + addinstcap(compst, IOpenCapture, Cgroup, tree->key, 0); + codegen(compst, sib1(tree), 0, tt, fullset); + addinstcap(compst, ICloseRunTime, Cclose, 0, 0); +} + + +/* +** Repetion; optimizations: +** When pattern is a charset, can use special instruction ISpan. +** When pattern is head fail, or if it starts with characters that +** are disjoint from what follows the repetions, a simple test +** is enough (a fail inside the repetition would backtrack to fail +** again in the following pattern, so there is no need for a choice). +** When 'opt' is true, the repetion can reuse the Choice already +** active in the stack. +*/ +static void coderep (CompileState *compst, TTree *tree, int opt, + const Charset *fl) { + Charset st; + if (tocharset(tree, &st)) { + addinstruction(compst, ISpan, 0); + addcharset(compst, st.cs); + } + else { + int e1 = getfirst(tree, fullset, &st); + if (headfail(tree) || (!e1 && cs_disjoint(&st, fl))) { + /* L1: test (fail(p1)) -> L2;

; jmp L1; L2: */ + int jmp; + int test = codetestset(compst, &st, 0); + codegen(compst, tree, 0, test, fullset); + jmp = addoffsetinst(compst, IJmp); + jumptohere(compst, test); + jumptothere(compst, jmp, test); + } + else { + /* test(fail(p1)) -> L2; choice L2; L1:

; partialcommit L1; L2: */ + /* or (if 'opt'): partialcommit L1; L1:

; partialcommit L1; */ + int commit, l2; + int test = codetestset(compst, &st, e1); + int pchoice = NOINST; + if (opt) + jumptohere(compst, addoffsetinst(compst, IPartialCommit)); + else + pchoice = addoffsetinst(compst, IChoice); + l2 = gethere(compst); + codegen(compst, tree, 0, NOINST, fullset); + commit = addoffsetinst(compst, IPartialCommit); + jumptothere(compst, commit, l2); + jumptohere(compst, pchoice); + jumptohere(compst, test); + } + } +} + + +/* +** Not predicate; optimizations: +** In any case, if first test fails, 'not' succeeds, so it can jump to +** the end. If pattern is headfail, that is all (it cannot fail +** in other parts); this case includes 'not' of simple sets. Otherwise, +** use the default code (a choice plus a failtwice). +*/ +static void codenot (CompileState *compst, TTree *tree) { + Charset st; + int e = getfirst(tree, fullset, &st); + int test = codetestset(compst, &st, e); + if (headfail(tree)) /* test (fail(p1)) -> L1; fail; L1: */ + addinstruction(compst, IFail, 0); + else { + /* test(fail(p))-> L1; choice L1;

; failtwice; L1: */ + int pchoice = addoffsetinst(compst, IChoice); + codegen(compst, tree, 0, NOINST, fullset); + addinstruction(compst, IFailTwice, 0); + jumptohere(compst, pchoice); + } + jumptohere(compst, test); +} + + +/* +** change open calls to calls, using list 'positions' to find +** correct offsets; also optimize tail calls +*/ +static void correctcalls (CompileState *compst, int *positions, + int from, int to) { + int i; + Instruction *code = compst->p->code; + for (i = from; i < to; i += sizei(&code[i])) { + if (code[i].i.code == IOpenCall) { + int n = code[i].i.key; /* rule number */ + int rule = positions[n]; /* rule position */ + assert(rule == from || code[rule - 1].i.code == IRet); + if (code[finaltarget(code, i + 2)].i.code == IRet) /* call; ret ? */ + code[i].i.code = IJmp; /* tail call */ + else + code[i].i.code = ICall; + jumptothere(compst, i, rule); /* call jumps to respective rule */ + } + } + assert(i == to); +} + + +/* +** Code for a grammar: +** call L1; jmp L2; L1: rule 1; ret; rule 2; ret; ...; L2: +*/ +static void codegrammar (CompileState *compst, TTree *grammar) { + int positions[MAXRULES]; + int rulenumber = 0; + TTree *rule; + int firstcall = addoffsetinst(compst, ICall); /* call initial rule */ + int jumptoend = addoffsetinst(compst, IJmp); /* jump to the end */ + int start = gethere(compst); /* here starts the initial rule */ + jumptohere(compst, firstcall); + for (rule = sib1(grammar); rule->tag == TRule; rule = sib2(rule)) { + positions[rulenumber++] = gethere(compst); /* save rule position */ + codegen(compst, sib1(rule), 0, NOINST, fullset); /* code rule */ + addinstruction(compst, IRet, 0); + } + assert(rule->tag == TTrue); + jumptohere(compst, jumptoend); + correctcalls(compst, positions, start, gethere(compst)); +} + + +static void codecall (CompileState *compst, TTree *call) { + int c = addoffsetinst(compst, IOpenCall); /* to be corrected later */ + getinstr(compst, c).i.key = sib2(call)->cap; /* rule number */ + assert(sib2(call)->tag == TRule); +} + + +/* +** Code first child of a sequence +** (second child is called in-place to allow tail call) +** Return 'tt' for second child +*/ +static int codeseq1 (CompileState *compst, TTree *p1, TTree *p2, + int tt, const Charset *fl) { + if (needfollow(p1)) { + Charset fl1; + getfirst(p2, fl, &fl1); /* p1 follow is p2 first */ + codegen(compst, p1, 0, tt, &fl1); + } + else /* use 'fullset' as follow */ + codegen(compst, p1, 0, tt, fullset); + if (fixedlen(p1) != 0) /* can 'p1' consume anything? */ + return NOINST; /* invalidate test */ + else return tt; /* else 'tt' still protects sib2 */ +} + + +/* +** Main code-generation function: dispatch to auxiliar functions +** according to kind of tree. ('needfollow' should return true +** only for consructions that use 'fl'.) +*/ +static void codegen (CompileState *compst, TTree *tree, int opt, int tt, + const Charset *fl) { + tailcall: + switch (tree->tag) { + case TChar: codechar(compst, tree->u.n, tt); break; + case TAny: addinstruction(compst, IAny, 0); break; + case TSet: codecharset(compst, treebuffer(tree), tt); break; + case TTrue: break; + case TFalse: addinstruction(compst, IFail, 0); break; + case TChoice: codechoice(compst, sib1(tree), sib2(tree), opt, fl); break; + case TRep: coderep(compst, sib1(tree), opt, fl); break; + case TBehind: codebehind(compst, tree); break; + case TNot: codenot(compst, sib1(tree)); break; + case TAnd: codeand(compst, sib1(tree), tt); break; + case TCapture: codecapture(compst, tree, tt, fl); break; + case TRunTime: coderuntime(compst, tree, tt); break; + case TGrammar: codegrammar(compst, tree); break; + case TCall: codecall(compst, tree); break; + case TSeq: { + tt = codeseq1(compst, sib1(tree), sib2(tree), tt, fl); /* code 'p1' */ + /* codegen(compst, p2, opt, tt, fl); */ + tree = sib2(tree); goto tailcall; + } + case TThrow: { /* labeled failure */ + addinstruction(compst, IThrow, (byte) tree->u.label); + break; + } + case TRecov: { /* labeled failure */ + coderecovery(compst, sib1(tree), sib2(tree), opt, fl, treelabelset(tree)); + break; + } + default: assert(0); + } +} + + +/* +** Optimize jumps and other jump-like instructions. +** * Update labels of instructions with labels to their final +** destinations (e.g., choice L1; ... L1: jmp L2: becomes +** choice L2) +** * Jumps to other instructions that do jumps become those +** instructions (e.g., jump to return becomes a return; jump +** to commit becomes a commit) +*/ +static void peephole (CompileState *compst) { + Instruction *code = compst->p->code; + int i; + for (i = 0; i < compst->ncode; i += sizei(&code[i])) { + redo: + switch (code[i].i.code) { + case IChoice: case ICall: case ICommit: case IPartialCommit: + case IBackCommit: case ITestChar: case ITestSet: + case IRecov: /* labeled failure */ + case ITestAny: { /* instructions with labels */ + jumptothere(compst, i, finallabel(code, i)); /* optimize label */ + break; + } + case IJmp: { + int ft = finaltarget(code, i); + switch (code[ft].i.code) { /* jumping to what? */ + case IRet: case IFail: case IFailTwice: + case IEnd: { /* instructions with unconditional implicit jumps */ + code[i] = code[ft]; /* jump becomes that instruction */ + code[i + 1].i.code = IAny; /* 'no-op' for target position */ + break; + } + case ICommit: case IPartialCommit: + case IBackCommit: { /* inst. with unconditional explicit jumps */ + int fft = finallabel(code, ft); + code[i] = code[ft]; /* jump becomes that instruction... */ + jumptothere(compst, i, fft); /* but must correct its offset */ + goto redo; /* reoptimize its label */ + } + default: { + jumptothere(compst, i, ft); /* optimize label */ + break; + } + } + break; + } + default: break; + } + } + assert(code[i - 1].i.code == IEnd); +} + + +/* +** Compile a pattern +*/ +Instruction *compile (lua_State *L, Pattern *p) { + CompileState compst; + compst.p = p; compst.ncode = 0; compst.L = L; + realloccode(L, p, 2); /* minimum initial size */ + codegen(&compst, p->tree, 0, NOINST, fullset); + addinstruction(&compst, IEnd, 0); + realloccode(L, p, compst.ncode); /* set final size */ + peephole(&compst); + return p->code; +} + + +/* }====================================================== */ + diff --git a/06/lpeglabel/lpcode.h b/06/lpeglabel/lpcode.h new file mode 100644 index 0000000..896d3c7 --- /dev/null +++ b/06/lpeglabel/lpcode.h @@ -0,0 +1,42 @@ +/* +** $Id: lpcode.h,v 1.7 2015/06/12 18:24:45 roberto Exp $ +*/ + +#if !defined(lpcode_h) +#define lpcode_h + +#include "lua.h" + +#include "lptypes.h" +#include "lptree.h" +#include "lpvm.h" + +int tocharset (TTree *tree, Charset *cs); +int checkaux (TTree *tree, int pred); +int fixedlenx (TTree *tree, int count, int len); +int hascaptures (TTree *tree); +int lp_gc (lua_State *L); +Instruction *compile (lua_State *L, Pattern *p); +void realloccode (lua_State *L, Pattern *p, int nsize); +int sizei (const Instruction *i); + + +#define PEnullable 0 +#define PEnofail 1 + +/* +** nofail(t) implies that 't' cannot fail with any input +*/ +#define nofail(t) checkaux(t, PEnofail) + +/* +** (not nullable(t)) implies 't' cannot match without consuming +** something +*/ +#define nullable(t) checkaux(t, PEnullable) + +#define fixedlen(t) fixedlenx(t, 0, 0) + + + +#endif diff --git 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zDr;q*YY~Fr2ff3F1|0L_7qQU-tC;Eif}QCF+!`9y>)RWAj#<&Cf;5UiIT(2}BY36wo>e(FZxz>R?l6iC2>UecPurjQ4vnee5 zlQCQqr;ht+CWmYB$Vnd|-GLwU3|>K(7LT+aV+!03TVlP^eo`>BSYqMPym{$^F8Qvg zXJq$%Ulmg1vvb&igO?k^8on!n1{s5)m1n=92MjMO`X5d`hppBUY#B5?IRk=OA6A$M z_e(?inMWIk_!pQsuZZ*l=>t0IvH^nqlBl@1$8XjgEdiRXTw<7hzix~3^pT<7oTXG2 z@0&s58fu~EB#F>V$kN943;J(9yE3$g>3)1{+%DZqEMIlH3mhnq;@zq7_)wNC6;k-= z9`)MvcnRfT!?L!V9K~DIoq-M#^Q()i9MW{x6p6VZi}d}v_z1pFeSqrTfqNZSDv#*@ zF;g1WpEXnZsXu3?G=#s-tb%ymW>838}@&ZT%bZ=i_O<1ZASM8QOTw7#y^wi%uhcAWwFIbbr AH~;_u literal 0 HcmV?d00001 diff --git a/06/lpeglabel/lpprint.c b/06/lpeglabel/lpprint.c new file mode 100644 index 0000000..8c488ea --- /dev/null +++ b/06/lpeglabel/lpprint.c @@ -0,0 +1,263 @@ +/* +** $Id: lpprint.c,v 1.9 2015/06/15 16:09:57 roberto Exp $ +** Copyright 2007, Lua.org & PUC-Rio (see 'lpeg.html' for license) +*/ + +#include +#include +#include + + +#include "lptypes.h" +#include "lpprint.h" +#include "lpcode.h" + + +#if defined(LPEG_DEBUG) + +/* +** {====================================================== +** Printing patterns (for debugging) +** ======================================================= +*/ + + +void printcharset (const byte *st) { + int i; + printf("["); + for (i = 0; i <= UCHAR_MAX; i++) { + int first = i; + while (testchar(st, i) && i <= UCHAR_MAX) i++; + if (i - 1 == first) /* unary range? */ + printf("(%02x)", first); + else if (i - 1 > first) /* non-empty range? */ + printf("(%02x-%02x)", first, i - 1); + } + printf("]"); +} + + +static void printcapkind (int kind) { + const char *const modes[] = { + "close", "position", "constant", "backref", + "argument", "simple", "table", "function", + "query", "string", "num", "substitution", "fold", + "runtime", "group"}; + printf("%s", modes[kind]); +} + + +static void printjmp (const Instruction *op, const Instruction *p) { + printf("-> %d", (int)(p + (p + 1)->offset - op)); +} + + +void printinst (const Instruction *op, const Instruction *p) { + const char *const names[] = { + "any", "char", "set", + "testany", "testchar", "testset", + "span", "behind", + "ret", "end", + "choice", "jmp", "call", "open_call", + "commit", "partial_commit", "back_commit", "failtwice", "fail", "giveup", + "fullcapture", "opencapture", "closecapture", "closeruntime", + "throw", "recovery" /* labeled failure */ + }; + printf("%02ld: %s ", (long)(p - op), names[p->i.code]); + switch ((Opcode)p->i.code) { + case IChar: { + printf("'%c'", p->i.aux); + break; + } + case ITestChar: { + printf("'%c'", p->i.aux); printjmp(op, p); + break; + } + case IFullCapture: { + printcapkind(getkind(p)); + printf(" (size = %d) (idx = %d)", getoff(p), p->i.key); + break; + } + case IOpenCapture: { + printcapkind(getkind(p)); + printf(" (idx = %d)", p->i.key); + break; + } + case ISet: { + printcharset((p+1)->buff); + break; + } + case ITestSet: { + printcharset((p+2)->buff); printjmp(op, p); + break; + } + case ISpan: { + printcharset((p+1)->buff); + break; + } + case IOpenCall: { + printf("-> %d", (p + 1)->offset); + break; + } + case IBehind: { + printf("%d", p->i.aux); + break; + } + case IJmp: case ICall: case ICommit: case IChoice: + case IPartialCommit: case IBackCommit: case ITestAny: { + printjmp(op, p); + break; + } + case IThrow: { /* labeled failure */ + printf("%d", p->i.aux); + break; + } + case IRecov: { /* labeled failure */ + printjmp(op, p); + printcharset((p+2)->buff); + break; + } + default: break; + } + printf("\n"); +} + + +void printpatt (Instruction *p, int n) { + Instruction *op = p; + while (p < op + n) { + printinst(op, p); + p += sizei(p); + } +} + + +#if defined(LPEG_DEBUG) +static void printcap (Capture *cap) { + printcapkind(cap->kind); + printf(" (idx: %d - size: %d) -> %p\n", cap->idx, cap->siz, cap->s); +} + + +void printcaplist (Capture *cap, Capture *limit) { + printf(">======\n"); + for (; cap->s && (limit == NULL || cap < limit); cap++) + printcap(cap); + printf("=======\n"); +} +#endif + +/* }====================================================== */ + + +/* +** {====================================================== +** Printing trees (for debugging) +** ======================================================= +*/ + +static const char *tagnames[] = { + "char", "set", "any", + "true", "false", + "rep", + "seq", "choice", + "not", "and", + "call", "opencall", "rule", "grammar", + "behind", + "capture", "run-time", + "throw", "labeled-choice", "recov" /* labeled failure */ +}; + + +void printtree (TTree *tree, int ident) { + int i; + for (i = 0; i < ident; i++) printf(" "); + printf("%s", tagnames[tree->tag]); + switch (tree->tag) { + case TChar: { + int c = tree->u.n; + if (isprint(c)) + printf(" '%c'\n", c); + else + printf(" (%02X)\n", c); + break; + } + case TSet: { + printcharset(treebuffer(tree)); + printf("\n"); + break; + } + case TOpenCall: case TCall: { + printf(" key: %d\n", tree->key); + break; + } + case TBehind: { + printf(" %d\n", tree->u.n); + printtree(sib1(tree), ident + 2); + break; + } + case TCapture: { + printf(" cap: %d key: %d n: %d\n", tree->cap, tree->key, tree->u.n); + printtree(sib1(tree), ident + 2); + break; + } + case TRule: { + printf(" n: %d key: %d\n", tree->cap, tree->key); + printtree(sib1(tree), ident + 2); + break; /* do not print next rule as a sibling */ + } + case TGrammar: { + TTree *rule = sib1(tree); + printf(" %d\n", tree->u.n); /* number of rules */ + for (i = 0; i < tree->u.n; i++) { + printtree(rule, ident + 2); + rule = sib2(rule); + } + assert(rule->tag == TTrue); /* sentinel */ + break; + } + case TThrow: { /* labeled failure */ + printf(" labels: %d\n", tree->u.label); + break; + } + default: { + int sibs = numsiblings[tree->tag]; + printf("\n"); + if (tree->tag == TRecov) { /* labeled failure */ + printcharset(treelabelset(tree)); + printf("\n"); + } + if (sibs >= 1) { + printtree(sib1(tree), ident + 2); + if (sibs >= 2) + printtree(sib2(tree), ident + 2); + } + break; + } + } +} + + +void printktable (lua_State *L, int idx) { + int n, i; + lua_getuservalue(L, idx); + if (lua_isnil(L, -1)) /* no ktable? */ + return; + n = lua_rawlen(L, -1); + printf("["); + for (i = 1; i <= n; i++) { + printf("%d = ", i); + lua_rawgeti(L, -1, i); + if (lua_isstring(L, -1)) + printf("%s ", lua_tostring(L, -1)); + else + printf("%s ", lua_typename(L, lua_type(L, -1))); + lua_pop(L, 1); + } + printf("]\n"); + /* leave ktable at the stack */ +} + +/* }====================================================== */ + +#endif diff --git a/06/lpeglabel/lpprint.h b/06/lpeglabel/lpprint.h new file mode 100644 index 0000000..6329760 --- /dev/null +++ b/06/lpeglabel/lpprint.h @@ -0,0 +1,36 @@ +/* +** $Id: lpprint.h,v 1.2 2015/06/12 18:18:08 roberto Exp $ +*/ + + +#if !defined(lpprint_h) +#define lpprint_h + + +#include "lptree.h" +#include "lpvm.h" + + +#if defined(LPEG_DEBUG) + +void printpatt (Instruction *p, int n); +void printtree (TTree *tree, int ident); +void printktable (lua_State *L, int idx); +void printcharset (const byte *st); +void printcaplist (Capture *cap, Capture *limit); +void printinst (const Instruction *op, const Instruction *p); + +#else + +#define printktable(L,idx) \ + luaL_error(L, "function only implemented in debug mode") +#define printtree(tree,i) \ + luaL_error(L, "function only implemented in debug mode") +#define printpatt(p,n) \ + luaL_error(L, "function only implemented in debug mode") + +#endif + + +#endif + diff --git a/06/lpeglabel/lptree.c b/06/lpeglabel/lptree.c new file mode 100644 index 0000000..6633035 --- /dev/null +++ b/06/lpeglabel/lptree.c @@ -0,0 +1,1363 @@ +/* +** $Id: lptree.c,v 1.21 2015/09/28 17:01:25 roberto Exp $ +** Copyright 2013, Lua.org & PUC-Rio (see 'lpeg.html' for license) +*/ + +#include +#include +#include + + +#include "lua.h" +#include "lauxlib.h" + +#include "lptypes.h" +#include "lpcap.h" +#include "lpcode.h" +#include "lpprint.h" +#include "lptree.h" + + +/* number of siblings for each tree */ +const byte numsiblings[] = { + 0, 0, 0, /* char, set, any */ + 0, 0, /* true, false */ + 1, /* rep */ + 2, 2, /* seq, choice */ + 1, 1, /* not, and */ + 0, 0, 2, 1, /* call, opencall, rule, grammar */ + 1, /* behind */ + 1, 1, /* capture, runtime capture */ + 0, 2 /* labeled failure throw, recovery */ +}; + + +static TTree *newgrammar (lua_State *L, int arg); + + +/* +** returns a reasonable name for value at index 'idx' on the stack +*/ +static const char *val2str (lua_State *L, int idx) { + const char *k = lua_tostring(L, idx); + if (k != NULL) + return lua_pushfstring(L, "%s", k); + else + return lua_pushfstring(L, "(a %s)", luaL_typename(L, idx)); +} + + +/* +** Fix a TOpenCall into a TCall node, using table 'postable' to +** translate a key to its rule address in the tree. Raises an +** error if key does not exist. +*/ +static void fixonecall (lua_State *L, int postable, TTree *g, TTree *t) { + int n; + lua_rawgeti(L, -1, t->key); /* get rule's name */ + lua_gettable(L, postable); /* query name in position table */ + n = lua_tonumber(L, -1); /* get (absolute) position */ + lua_pop(L, 1); /* remove position */ + if (n == 0) { /* no position? */ + lua_rawgeti(L, -1, t->key); /* get rule's name again */ + luaL_error(L, "rule '%s' undefined in given grammar", val2str(L, -1)); + } + t->tag = TCall; + t->u.s.ps = n - (t - g); /* position relative to node */ + assert(sib2(t)->tag == TRule); + sib2(t)->key = t->key; +} + + +/* +** Transform left associative constructions into right +** associative ones, for sequence and choice; that is: +** (t11 + t12) + t2 => t11 + (t12 + t2) +** (t11 * t12) * t2 => t11 * (t12 * t2) +** (that is, Op (Op t11 t12) t2 => Op t11 (Op t12 t2)) +*/ +static void correctassociativity (TTree *tree) { + TTree *t1 = sib1(tree); + assert(tree->tag == TChoice || tree->tag == TSeq); + while (t1->tag == tree->tag) { + int n1size = tree->u.s.ps - 1; /* t1 == Op t11 t12 */ + int n11size = t1->u.s.ps - 1; + int n12size = n1size - n11size - 1; + memmove(sib1(tree), sib1(t1), n11size * sizeof(TTree)); /* move t11 */ + tree->u.s.ps = n11size + 1; + sib2(tree)->tag = tree->tag; + sib2(tree)->u.s.ps = n12size + 1; + } +} + + +/* +** Make final adjustments in a tree. Fix open calls in tree 't', +** making them refer to their respective rules or raising appropriate +** errors (if not inside a grammar). Correct associativity of associative +** constructions (making them right associative). Assume that tree's +** ktable is at the top of the stack (for error messages). +*/ +static void finalfix (lua_State *L, int postable, TTree *g, TTree *t) { + tailcall: + switch (t->tag) { + case TGrammar: /* subgrammars were already fixed */ + return; + case TOpenCall: { + if (g != NULL) /* inside a grammar? */ + fixonecall(L, postable, g, t); + else { /* open call outside grammar */ + lua_rawgeti(L, -1, t->key); + luaL_error(L, "rule '%s' used outside a grammar", val2str(L, -1)); + } + break; + } + case TSeq: case TChoice: + correctassociativity(t); + break; + } + switch (numsiblings[t->tag]) { + case 1: /* finalfix(L, postable, g, sib1(t)); */ + t = sib1(t); goto tailcall; + case 2: + finalfix(L, postable, g, sib1(t)); + t = sib2(t); goto tailcall; /* finalfix(L, postable, g, sib2(t)); */ + default: assert(numsiblings[t->tag] == 0); break; + } +} + + + +/* +** {=================================================================== +** KTable manipulation +** +** - The ktable of a pattern 'p' can be shared by other patterns that +** contain 'p' and no other constants. Because of this sharing, we +** should not add elements to a 'ktable' unless it was freshly created +** for the new pattern. +** +** - The maximum index in a ktable is USHRT_MAX, because trees and +** patterns use unsigned shorts to store those indices. +** ==================================================================== +*/ + +/* +** Create a new 'ktable' to the pattern at the top of the stack. +*/ +static void newktable (lua_State *L, int n) { + lua_createtable(L, n, 0); /* create a fresh table */ + lua_setuservalue(L, -2); /* set it as 'ktable' for pattern */ +} + + +/* +** Add element 'idx' to 'ktable' of pattern at the top of the stack; +** Return index of new element. +** If new element is nil, does not add it to table (as it would be +** useless) and returns 0, as ktable[0] is always nil. +*/ +static int addtoktable (lua_State *L, int idx) { + if (lua_isnil(L, idx)) /* nil value? */ + return 0; + else { + int n; + lua_getuservalue(L, -1); /* get ktable from pattern */ + n = lua_rawlen(L, -1); + if (n >= USHRT_MAX) + luaL_error(L, "too many Lua values in pattern"); + lua_pushvalue(L, idx); /* element to be added */ + lua_rawseti(L, -2, ++n); + lua_pop(L, 1); /* remove 'ktable' */ + return n; + } +} + + +/* +** Return the number of elements in the ktable at 'idx'. +** In Lua 5.2/5.3, default "environment" for patterns is nil, not +** a table. Treat it as an empty table. In Lua 5.1, assumes that +** the environment has no numeric indices (len == 0) +*/ +static int ktablelen (lua_State *L, int idx) { + if (!lua_istable(L, idx)) return 0; + else return lua_rawlen(L, idx); +} + + +/* +** Concatentate the contents of table 'idx1' into table 'idx2'. +** (Assume that both indices are negative.) +** Return the original length of table 'idx2' (or 0, if no +** element was added, as there is no need to correct any index). +*/ +static int concattable (lua_State *L, int idx1, int idx2) { + int i; + int n1 = ktablelen(L, idx1); + int n2 = ktablelen(L, idx2); + if (n1 + n2 > USHRT_MAX) + luaL_error(L, "too many Lua values in pattern"); + if (n1 == 0) return 0; /* nothing to correct */ + for (i = 1; i <= n1; i++) { + lua_rawgeti(L, idx1, i); + lua_rawseti(L, idx2 - 1, n2 + i); /* correct 'idx2' */ + } + return n2; +} + + +/* +** When joining 'ktables', constants from one of the subpatterns must +** be renumbered; 'correctkeys' corrects their indices (adding 'n' +** to each of them) +*/ +static void correctkeys (TTree *tree, int n) { + if (n == 0) return; /* no correction? */ + tailcall: + switch (tree->tag) { + case TOpenCall: case TCall: case TRunTime: case TRule: { + if (tree->key > 0) + tree->key += n; + break; + } + case TCapture: { + if (tree->key > 0 && tree->cap != Carg && tree->cap != Cnum) + tree->key += n; + break; + } + default: break; + } + switch (numsiblings[tree->tag]) { + case 1: /* correctkeys(sib1(tree), n); */ + tree = sib1(tree); goto tailcall; + case 2: + correctkeys(sib1(tree), n); + tree = sib2(tree); goto tailcall; /* correctkeys(sib2(tree), n); */ + default: assert(numsiblings[tree->tag] == 0); break; + } +} + + +/* +** Join the ktables from p1 and p2 the ktable for the new pattern at the +** top of the stack, reusing them when possible. +*/ +static void joinktables (lua_State *L, int p1, TTree *t2, int p2) { + int n1, n2; + lua_getuservalue(L, p1); /* get ktables */ + lua_getuservalue(L, p2); + n1 = ktablelen(L, -2); + n2 = ktablelen(L, -1); + if (n1 == 0 && n2 == 0) /* are both tables empty? */ + lua_pop(L, 2); /* nothing to be done; pop tables */ + else if (n2 == 0 || lp_equal(L, -2, -1)) { /* 2nd table empty or equal? */ + lua_pop(L, 1); /* pop 2nd table */ + lua_setuservalue(L, -2); /* set 1st ktable into new pattern */ + } + else if (n1 == 0) { /* first table is empty? */ + lua_setuservalue(L, -3); /* set 2nd table into new pattern */ + lua_pop(L, 1); /* pop 1st table */ + } + else { + lua_createtable(L, n1 + n2, 0); /* create ktable for new pattern */ + /* stack: new p; ktable p1; ktable p2; new ktable */ + concattable(L, -3, -1); /* from p1 into new ktable */ + concattable(L, -2, -1); /* from p2 into new ktable */ + lua_setuservalue(L, -4); /* new ktable becomes 'p' environment */ + lua_pop(L, 2); /* pop other ktables */ + correctkeys(t2, n1); /* correction for indices from p2 */ + } +} + + +/* +** copy 'ktable' of element 'idx' to new tree (on top of stack) +*/ +static void copyktable (lua_State *L, int idx) { + lua_getuservalue(L, idx); + lua_setuservalue(L, -2); +} + + +/* +** merge 'ktable' from 'stree' at stack index 'idx' into 'ktable' +** from tree at the top of the stack, and correct corresponding +** tree. +*/ +static void mergektable (lua_State *L, int idx, TTree *stree) { + int n; + lua_getuservalue(L, -1); /* get ktables */ + lua_getuservalue(L, idx); + n = concattable(L, -1, -2); + lua_pop(L, 2); /* remove both ktables */ + correctkeys(stree, n); +} + + +/* +** Create a new 'ktable' to the pattern at the top of the stack, adding +** all elements from pattern 'p' (if not 0) plus element 'idx' to it. +** Return index of new element. +*/ +static int addtonewktable (lua_State *L, int p, int idx) { + newktable(L, 1); + if (p) + mergektable(L, p, NULL); + return addtoktable(L, idx); +} + +/* }====================================================== */ + + +/* +** {====================================================== +** Tree generation +** ======================================================= +*/ + +/* +** In 5.2, could use 'luaL_testudata'... +*/ +static int testpattern (lua_State *L, int idx) { + if (lua_touserdata(L, idx)) { /* value is a userdata? */ + if (lua_getmetatable(L, idx)) { /* does it have a metatable? */ + luaL_getmetatable(L, PATTERN_T); + if (lua_rawequal(L, -1, -2)) { /* does it have the correct mt? */ + lua_pop(L, 2); /* remove both metatables */ + return 1; + } + } + } + return 0; +} + + +static Pattern *getpattern (lua_State *L, int idx) { + return (Pattern *)luaL_checkudata(L, idx, PATTERN_T); +} + + +static int getsize (lua_State *L, int idx) { + return (lua_rawlen(L, idx) - sizeof(Pattern)) / sizeof(TTree) + 1; +} + + +static TTree *gettree (lua_State *L, int idx, int *len) { + Pattern *p = getpattern(L, idx); + if (len) + *len = getsize(L, idx); + return p->tree; +} + + +/* +** create a pattern. Set its uservalue (the 'ktable') equal to its +** metatable. (It could be any empty sequence; the metatable is at +** hand here, so we use it.) +*/ +static TTree *newtree (lua_State *L, int len) { + size_t size = (len - 1) * sizeof(TTree) + sizeof(Pattern); + Pattern *p = (Pattern *)lua_newuserdata(L, size); + luaL_getmetatable(L, PATTERN_T); + lua_pushvalue(L, -1); + lua_setuservalue(L, -3); + lua_setmetatable(L, -2); + p->code = NULL; p->codesize = 0; + return p->tree; +} + + +static TTree *newleaf (lua_State *L, int tag) { + TTree *tree = newtree(L, 1); + tree->tag = tag; + return tree; +} + + +static TTree *newcharset (lua_State *L) { + TTree *tree = newtree(L, bytes2slots(CHARSETSIZE) + 1); + tree->tag = TSet; + loopset(i, treebuffer(tree)[i] = 0); + return tree; +} + + +/* +** add to tree a sequence where first sibling is 'sib' (with size +** 'sibsize'); returns position for second sibling +*/ +static TTree *seqaux (TTree *tree, TTree *sib, int sibsize) { + tree->tag = TSeq; tree->u.s.ps = sibsize + 1; + memcpy(sib1(tree), sib, sibsize * sizeof(TTree)); + return sib2(tree); +} + + +/* +** Build a sequence of 'n' nodes, each with tag 'tag' and 'u.n' got +** from the array 's' (or 0 if array is NULL). (TSeq is binary, so it +** must build a sequence of sequence of sequence...) +*/ +static void fillseq (TTree *tree, int tag, int n, const char *s) { + int i; + for (i = 0; i < n - 1; i++) { /* initial n-1 copies of Seq tag; Seq ... */ + tree->tag = TSeq; tree->u.s.ps = 2; + sib1(tree)->tag = tag; + sib1(tree)->u.n = s ? (byte)s[i] : 0; + tree = sib2(tree); + } + tree->tag = tag; /* last one does not need TSeq */ + tree->u.n = s ? (byte)s[i] : 0; +} + + +/* +** Numbers as patterns: +** 0 == true (always match); n == TAny repeated 'n' times; +** -n == not (TAny repeated 'n' times) +*/ +static TTree *numtree (lua_State *L, int n) { + if (n == 0) + return newleaf(L, TTrue); + else { + TTree *tree, *nd; + if (n > 0) + tree = nd = newtree(L, 2 * n - 1); + else { /* negative: code it as !(-n) */ + n = -n; + tree = newtree(L, 2 * n); + tree->tag = TNot; + nd = sib1(tree); + } + fillseq(nd, TAny, n, NULL); /* sequence of 'n' any's */ + return tree; + } +} + + +/* +** Convert value at index 'idx' to a pattern +*/ +static TTree *getpatt (lua_State *L, int idx, int *len) { + TTree *tree; + switch (lua_type(L, idx)) { + case LUA_TSTRING: { + size_t slen; + const char *s = lua_tolstring(L, idx, &slen); /* get string */ + if (slen == 0) /* empty? */ + tree = newleaf(L, TTrue); /* always match */ + else { + tree = newtree(L, 2 * (slen - 1) + 1); + fillseq(tree, TChar, slen, s); /* sequence of 'slen' chars */ + } + break; + } + case LUA_TNUMBER: { + int n = lua_tointeger(L, idx); + tree = numtree(L, n); + break; + } + case LUA_TBOOLEAN: { + tree = (lua_toboolean(L, idx) ? newleaf(L, TTrue) : newleaf(L, TFalse)); + break; + } + case LUA_TTABLE: { + tree = newgrammar(L, idx); + break; + } + case LUA_TFUNCTION: { + tree = newtree(L, 2); + tree->tag = TRunTime; + tree->key = addtonewktable(L, 0, idx); + sib1(tree)->tag = TTrue; + break; + } + default: { + return gettree(L, idx, len); + } + } + lua_replace(L, idx); /* put new tree into 'idx' slot */ + if (len) + *len = getsize(L, idx); + return tree; +} + + +/* +** create a new tree, whith a new root and one sibling. +** Sibling must be on the Lua stack, at index 1. +*/ +static TTree *newroot1sib (lua_State *L, int tag) { + int s1; + TTree *tree1 = getpatt(L, 1, &s1); + TTree *tree = newtree(L, 1 + s1); /* create new tree */ + tree->tag = tag; + memcpy(sib1(tree), tree1, s1 * sizeof(TTree)); + copyktable(L, 1); + return tree; +} + + +/* +** create a new tree, whith a new root and 2 siblings. +** Siblings must be on the Lua stack, first one at index 1. +*/ +static TTree *newroot2sib (lua_State *L, int tag) { + int s1, s2; + TTree *tree1 = getpatt(L, 1, &s1); + TTree *tree2 = getpatt(L, 2, &s2); + TTree *tree = newtree(L, 1 + s1 + s2); /* create new tree */ + tree->tag = tag; + tree->u.s.ps = 1 + s1; + memcpy(sib1(tree), tree1, s1 * sizeof(TTree)); + memcpy(sib2(tree), tree2, s2 * sizeof(TTree)); + joinktables(L, 1, sib2(tree), 2); + return tree; +} + + +/* labeled failure begin */ +static TTree *newthrowleaf (lua_State *L, int lab) { + TTree *tree = newtree(L, 1); + tree->tag = TThrow; + tree->u.label = lab; + return tree; +} + +static TTree *newrootlab2sib (lua_State *L, int tag) { + int s1, s2; + TTree *tree1 = getpatt(L, 1, &s1); + TTree *tree2 = getpatt(L, 2, &s2); + TTree *tree = newtree(L, bytes2slots(LABELSETSIZE) + 1 + s1 + s2); /* create new tree */ + tree->tag = tag; + tree->u.s.ps = 1 + s1; + tree->u.s.plab = 1 + s1 + s2; + memcpy(sib1(tree), tree1, s1 * sizeof(TTree)); + memcpy(sib2(tree), tree2, s2 * sizeof(TTree)); + loopset(i, treelabelset(tree)[i] = 0); + joinktables(L, 1, sib2(tree), 2); + return tree; +} +/* labeled failure end */ + + + +static int lp_P (lua_State *L) { + luaL_checkany(L, 1); + getpatt(L, 1, NULL); + lua_settop(L, 1); + return 1; +} + + +/* +** sequence operator; optimizations: +** false x => false, x true => x, true x => x +** (cannot do x . false => false because x may have runtime captures) +*/ +static int lp_seq (lua_State *L) { + TTree *tree1 = getpatt(L, 1, NULL); + TTree *tree2 = getpatt(L, 2, NULL); + if (tree1->tag == TFalse || tree2->tag == TTrue) + lua_pushvalue(L, 1); /* false . x == false, x . true = x */ + else if (tree1->tag == TTrue) + lua_pushvalue(L, 2); /* true . x = x */ + else + newroot2sib(L, TSeq); + return 1; +} + + +/* +** choice operator; optimizations: +** charset / charset => charset +** true / x => true, x / false => x, false / x => x +** (x / true is not equivalent to true) +*/ +static int lp_choice (lua_State *L) { + Charset st1, st2; + TTree *t1 = getpatt(L, 1, NULL); + TTree *t2 = getpatt(L, 2, NULL); + if (tocharset(t1, &st1) && tocharset(t2, &st2)) { + TTree *t = newcharset(L); + loopset(i, treebuffer(t)[i] = st1.cs[i] | st2.cs[i]); + } + else if (nofail(t1) || t2->tag == TFalse) + lua_pushvalue(L, 1); /* true / x => true, x / false => x */ + else if (t1->tag == TFalse) + lua_pushvalue(L, 2); /* false / x => x */ + else + newroot2sib(L, TChoice); + return 1; +} + + +/* +** p^n +*/ +static int lp_star (lua_State *L) { + int size1; + int n = (int)luaL_checkinteger(L, 2); + TTree *tree1 = getpatt(L, 1, &size1); + if (n >= 0) { /* seq tree1 (seq tree1 ... (seq tree1 (rep tree1))) */ + TTree *tree = newtree(L, (n + 1) * (size1 + 1)); + if (nullable(tree1)) + luaL_error(L, "loop body may accept empty string"); + while (n--) /* repeat 'n' times */ + tree = seqaux(tree, tree1, size1); + tree->tag = TRep; + memcpy(sib1(tree), tree1, size1 * sizeof(TTree)); + } + else { /* choice (seq tree1 ... choice tree1 true ...) true */ + TTree *tree; + n = -n; + /* size = (choice + seq + tree1 + true) * n, but the last has no seq */ + tree = newtree(L, n * (size1 + 3) - 1); + for (; n > 1; n--) { /* repeat (n - 1) times */ + tree->tag = TChoice; tree->u.s.ps = n * (size1 + 3) - 2; + sib2(tree)->tag = TTrue; + tree = sib1(tree); + tree = seqaux(tree, tree1, size1); + } + tree->tag = TChoice; tree->u.s.ps = size1 + 1; + sib2(tree)->tag = TTrue; + memcpy(sib1(tree), tree1, size1 * sizeof(TTree)); + } + copyktable(L, 1); + return 1; +} + + +/* +** #p == &p +*/ +static int lp_and (lua_State *L) { + newroot1sib(L, TAnd); + return 1; +} + + +/* +** -p == !p +*/ +static int lp_not (lua_State *L) { + newroot1sib(L, TNot); + return 1; +} + + +/* +** [t1 - t2] == Seq (Not t2) t1 +** If t1 and t2 are charsets, make their difference. +*/ +static int lp_sub (lua_State *L) { + Charset st1, st2; + int s1, s2; + TTree *t1 = getpatt(L, 1, &s1); + TTree *t2 = getpatt(L, 2, &s2); + if (tocharset(t1, &st1) && tocharset(t2, &st2)) { + TTree *t = newcharset(L); + loopset(i, treebuffer(t)[i] = st1.cs[i] & ~st2.cs[i]); + } + else { + TTree *tree = newtree(L, 2 + s1 + s2); + tree->tag = TSeq; /* sequence of... */ + tree->u.s.ps = 2 + s2; + sib1(tree)->tag = TNot; /* ...not... */ + memcpy(sib1(sib1(tree)), t2, s2 * sizeof(TTree)); /* ...t2 */ + memcpy(sib2(tree), t1, s1 * sizeof(TTree)); /* ... and t1 */ + joinktables(L, 1, sib1(tree), 2); + } + return 1; +} + + +static int lp_set (lua_State *L) { + size_t l; + const char *s = luaL_checklstring(L, 1, &l); + TTree *tree = newcharset(L); + while (l--) { + setchar(treebuffer(tree), (byte)(*s)); + s++; + } + return 1; +} + + +static int lp_range (lua_State *L) { + int arg; + int top = lua_gettop(L); + TTree *tree = newcharset(L); + for (arg = 1; arg <= top; arg++) { + int c; + size_t l; + const char *r = luaL_checklstring(L, arg, &l); + luaL_argcheck(L, l == 2, arg, "range must have two characters"); + for (c = (byte)r[0]; c <= (byte)r[1]; c++) + setchar(treebuffer(tree), c); + } + return 1; +} + + +/* +** Look-behind predicate +*/ +static int lp_behind (lua_State *L) { + TTree *tree; + TTree *tree1 = getpatt(L, 1, NULL); + int n = fixedlen(tree1); + luaL_argcheck(L, n >= 0, 1, "pattern may not have fixed length"); + luaL_argcheck(L, !hascaptures(tree1), 1, "pattern have captures"); + luaL_argcheck(L, n <= MAXBEHIND, 1, "pattern too long to look behind"); + tree = newroot1sib(L, TBehind); + tree->u.n = n; + return 1; +} + + +/* labeled failure begin */ +/* +** Throws a label +*/ +static int lp_throw (lua_State *L) { + int label = luaL_checkinteger(L, -1); + luaL_argcheck(L, label >= 1 && label < MAXLABELS, -1, "the number of a label must be between 1 and 255"); + newthrowleaf(L, label); + return 1; +} + +/* +** labeled recovery function +*/ +static int lp_recovery (lua_State *L) { + int n = lua_gettop(L); + TTree *tree = newrootlab2sib(L, TRecov); + luaL_argcheck(L, n >= 3, 3, "non-nil value expected"); + if (n == 2) { /* catches fail as default */ + /*setlabel(treelabelset(tree), LFAIL); recovery does not catch regular fail */ + } else { + int i; + for (i = 3; i <= n; i++) { + int d = luaL_checkinteger(L, i); + luaL_argcheck(L, d >= 1 && d < MAXLABELS, i, "the number of a label must be between 1 and 255"); + setlabel(treelabelset(tree), (byte)d); + } + } + return 1; +} + +/* labeled failure end */ + + +/* +** Create a non-terminal +*/ +static int lp_V (lua_State *L) { + TTree *tree = newleaf(L, TOpenCall); + luaL_argcheck(L, !lua_isnoneornil(L, 1), 1, "non-nil value expected"); + tree->key = addtonewktable(L, 0, 1); + return 1; +} + + +/* +** Create a tree for a non-empty capture, with a body and +** optionally with an associated Lua value (at index 'labelidx' in the +** stack) +*/ +static int capture_aux (lua_State *L, int cap, int labelidx) { + TTree *tree = newroot1sib(L, TCapture); + tree->cap = cap; + tree->key = (labelidx == 0) ? 0 : addtonewktable(L, 1, labelidx); + return 1; +} + + +/* +** Fill a tree with an empty capture, using an empty (TTrue) sibling. +*/ +static TTree *auxemptycap (TTree *tree, int cap) { + tree->tag = TCapture; + tree->cap = cap; + sib1(tree)->tag = TTrue; + return tree; +} + + +/* +** Create a tree for an empty capture +*/ +static TTree *newemptycap (lua_State *L, int cap) { + return auxemptycap(newtree(L, 2), cap); +} + + +/* +** Create a tree for an empty capture with an associated Lua value +*/ +static TTree *newemptycapkey (lua_State *L, int cap, int idx) { + TTree *tree = auxemptycap(newtree(L, 2), cap); + tree->key = addtonewktable(L, 0, idx); + return tree; +} + + +/* +** Captures with syntax p / v +** (function capture, query capture, string capture, or number capture) +*/ +static int lp_divcapture (lua_State *L) { + switch (lua_type(L, 2)) { + case LUA_TFUNCTION: return capture_aux(L, Cfunction, 2); + case LUA_TTABLE: return capture_aux(L, Cquery, 2); + case LUA_TSTRING: return capture_aux(L, Cstring, 2); + case LUA_TNUMBER: { + int n = lua_tointeger(L, 2); + TTree *tree = newroot1sib(L, TCapture); + luaL_argcheck(L, 0 <= n && n <= SHRT_MAX, 1, "invalid number"); + tree->cap = Cnum; + tree->key = n; + return 1; + } + default: return luaL_argerror(L, 2, "invalid replacement value"); + } +} + + +static int lp_substcapture (lua_State *L) { + return capture_aux(L, Csubst, 0); +} + + +static int lp_tablecapture (lua_State *L) { + return capture_aux(L, Ctable, 0); +} + + +static int lp_groupcapture (lua_State *L) { + if (lua_isnoneornil(L, 2)) + return capture_aux(L, Cgroup, 0); + else + return capture_aux(L, Cgroup, 2); +} + + +static int lp_foldcapture (lua_State *L) { + luaL_checktype(L, 2, LUA_TFUNCTION); + return capture_aux(L, Cfold, 2); +} + + +static int lp_simplecapture (lua_State *L) { + return capture_aux(L, Csimple, 0); +} + + +static int lp_poscapture (lua_State *L) { + newemptycap(L, Cposition); + return 1; +} + + +static int lp_argcapture (lua_State *L) { + int n = (int)luaL_checkinteger(L, 1); + TTree *tree = newemptycap(L, Carg); + tree->key = n; + luaL_argcheck(L, 0 < n && n <= SHRT_MAX, 1, "invalid argument index"); + return 1; +} + + +static int lp_backref (lua_State *L) { + luaL_checkany(L, 1); + newemptycapkey(L, Cbackref, 1); + return 1; +} + + +/* +** Constant capture +*/ +static int lp_constcapture (lua_State *L) { + int i; + int n = lua_gettop(L); /* number of values */ + if (n == 0) /* no values? */ + newleaf(L, TTrue); /* no capture */ + else if (n == 1) + newemptycapkey(L, Cconst, 1); /* single constant capture */ + else { /* create a group capture with all values */ + TTree *tree = newtree(L, 1 + 3 * (n - 1) + 2); + newktable(L, n); /* create a 'ktable' for new tree */ + tree->tag = TCapture; + tree->cap = Cgroup; + tree->key = 0; + tree = sib1(tree); + for (i = 1; i <= n - 1; i++) { + tree->tag = TSeq; + tree->u.s.ps = 3; /* skip TCapture and its sibling */ + auxemptycap(sib1(tree), Cconst); + sib1(tree)->key = addtoktable(L, i); + tree = sib2(tree); + } + auxemptycap(tree, Cconst); + tree->key = addtoktable(L, i); + } + return 1; +} + + +static int lp_matchtime (lua_State *L) { + TTree *tree; + luaL_checktype(L, 2, LUA_TFUNCTION); + tree = newroot1sib(L, TRunTime); + tree->key = addtonewktable(L, 1, 2); + return 1; +} + +/* }====================================================== */ + + +/* +** {====================================================== +** Grammar - Tree generation +** ======================================================= +*/ + +/* +** push on the stack the index and the pattern for the +** initial rule of grammar at index 'arg' in the stack; +** also add that index into position table. +*/ +static void getfirstrule (lua_State *L, int arg, int postab) { + lua_rawgeti(L, arg, 1); /* access first element */ + if (lua_isstring(L, -1)) { /* is it the name of initial rule? */ + lua_pushvalue(L, -1); /* duplicate it to use as key */ + lua_gettable(L, arg); /* get associated rule */ + } + else { + lua_pushinteger(L, 1); /* key for initial rule */ + lua_insert(L, -2); /* put it before rule */ + } + if (!testpattern(L, -1)) { /* initial rule not a pattern? */ + if (lua_isnil(L, -1)) + luaL_error(L, "grammar has no initial rule"); + else + luaL_error(L, "initial rule '%s' is not a pattern", lua_tostring(L, -2)); + } + lua_pushvalue(L, -2); /* push key */ + lua_pushinteger(L, 1); /* push rule position (after TGrammar) */ + lua_settable(L, postab); /* insert pair at position table */ +} + +/* +** traverse grammar at index 'arg', pushing all its keys and patterns +** into the stack. Create a new table (before all pairs key-pattern) to +** collect all keys and their associated positions in the final tree +** (the "position table"). +** Return the number of rules and (in 'totalsize') the total size +** for the new tree. +*/ +static int collectrules (lua_State *L, int arg, int *totalsize) { + int n = 1; /* to count number of rules */ + int postab = lua_gettop(L) + 1; /* index of position table */ + int size; /* accumulator for total size */ + lua_newtable(L); /* create position table */ + getfirstrule(L, arg, postab); + size = 2 + getsize(L, postab + 2); /* TGrammar + TRule + rule */ + lua_pushnil(L); /* prepare to traverse grammar table */ + while (lua_next(L, arg) != 0) { + if (lua_tonumber(L, -2) == 1 || + lp_equal(L, -2, postab + 1)) { /* initial rule? */ + lua_pop(L, 1); /* remove value (keep key for lua_next) */ + continue; + } + if (!testpattern(L, -1)) /* value is not a pattern? */ + luaL_error(L, "rule '%s' is not a pattern", val2str(L, -2)); + luaL_checkstack(L, LUA_MINSTACK, "grammar has too many rules"); + lua_pushvalue(L, -2); /* push key (to insert into position table) */ + lua_pushinteger(L, size); + lua_settable(L, postab); + size += 1 + getsize(L, -1); /* update size */ + lua_pushvalue(L, -2); /* push key (for next lua_next) */ + n++; + } + *totalsize = size + 1; /* TTrue to finish list of rules */ + return n; +} + + +static void buildgrammar (lua_State *L, TTree *grammar, int frule, int n) { + int i; + TTree *nd = sib1(grammar); /* auxiliary pointer to traverse the tree */ + for (i = 0; i < n; i++) { /* add each rule into new tree */ + int ridx = frule + 2*i + 1; /* index of i-th rule */ + int rulesize; + TTree *rn = gettree(L, ridx, &rulesize); + nd->tag = TRule; + nd->key = 0; + nd->cap = i; /* rule number */ + nd->u.s.ps = rulesize + 1; /* point to next rule */ + memcpy(sib1(nd), rn, rulesize * sizeof(TTree)); /* copy rule */ + mergektable(L, ridx, sib1(nd)); /* merge its ktable into new one */ + nd = sib2(nd); /* move to next rule */ + } + nd->tag = TTrue; /* finish list of rules */ +} + + +/* +** Check whether a tree has potential infinite loops +*/ +static int checkloops (TTree *tree) { + tailcall: + if (tree->tag == TRep && nullable(sib1(tree))) + return 1; + else if (tree->tag == TGrammar) + return 0; /* sub-grammars already checked */ + else { + switch (numsiblings[tree->tag]) { + case 1: /* return checkloops(sib1(tree)); */ + tree = sib1(tree); goto tailcall; + case 2: + if (checkloops(sib1(tree))) return 1; + /* else return checkloops(sib2(tree)); */ + tree = sib2(tree); goto tailcall; + default: assert(numsiblings[tree->tag] == 0); return 0; + } + } +} + + +static int verifyerror (lua_State *L, int *passed, int npassed) { + int i, j; + for (i = npassed - 1; i >= 0; i--) { /* search for a repetition */ + for (j = i - 1; j >= 0; j--) { + if (passed[i] == passed[j]) { + lua_rawgeti(L, -1, passed[i]); /* get rule's key */ + return luaL_error(L, "rule '%s' may be left recursive", val2str(L, -1)); + } + } + } + return luaL_error(L, "too many left calls in grammar"); +} + + +/* +** Check whether a rule can be left recursive; raise an error in that +** case; otherwise return 1 iff pattern is nullable. +** The return value is used to check sequences, where the second pattern +** is only relevant if the first is nullable. +** Parameter 'nb' works as an accumulator, to allow tail calls in +** choices. ('nb' true makes function returns true.) +** Assume ktable at the top of the stack. +*/ +static int verifyrule (lua_State *L, TTree *tree, int *passed, int npassed, + int nb) { + tailcall: + switch (tree->tag) { + case TChar: case TSet: case TAny: + case TFalse: case TThrow: /* labeled failure */ + return nb; /* cannot pass from here */ + case TTrue: + case TBehind: /* look-behind cannot have calls */ + return 1; + case TNot: case TAnd: case TRep: + /* return verifyrule(L, sib1(tree), passed, npassed, 1); */ + tree = sib1(tree); nb = 1; goto tailcall; + case TCapture: case TRunTime: + /* return verifyrule(L, sib1(tree), passed, npassed, nb); */ + tree = sib1(tree); goto tailcall; + case TCall: + /* return verifyrule(L, sib2(tree), passed, npassed, nb); */ + tree = sib2(tree); goto tailcall; + case TSeq: /* only check 2nd child if first is nb */ + if (!verifyrule(L, sib1(tree), passed, npassed, 0)) + return nb; + /* else return verifyrule(L, sib2(tree), passed, npassed, nb); */ + tree = sib2(tree); goto tailcall; + case TChoice: case TRecov: /* must check both children */ /* labeled failure */ + nb = verifyrule(L, sib1(tree), passed, npassed, nb); + /* return verifyrule(L, sib2(tree), passed, npassed, nb); */ + tree = sib2(tree); goto tailcall; + case TRule: + if (npassed >= MAXRULES) + return verifyerror(L, passed, npassed); + else { + passed[npassed++] = tree->key; + /* return verifyrule(L, sib1(tree), passed, npassed); */ + tree = sib1(tree); goto tailcall; + } + case TGrammar: + return nullable(tree); /* sub-grammar cannot be left recursive */ + default: assert(0); return 0; + } +} + + +static void verifygrammar (lua_State *L, TTree *grammar) { + int passed[MAXRULES]; + TTree *rule; + /* check left-recursive rules */ + for (rule = sib1(grammar); rule->tag == TRule; rule = sib2(rule)) { + if (rule->key == 0) continue; /* unused rule */ + verifyrule(L, sib1(rule), passed, 0, 0); + } + assert(rule->tag == TTrue); + /* check infinite loops inside rules */ + for (rule = sib1(grammar); rule->tag == TRule; rule = sib2(rule)) { + if (rule->key == 0) continue; /* unused rule */ + if (checkloops(sib1(rule))) { + lua_rawgeti(L, -1, rule->key); /* get rule's key */ + luaL_error(L, "empty loop in rule '%s'", val2str(L, -1)); + } + } + assert(rule->tag == TTrue); +} + + +/* +** Give a name for the initial rule if it is not referenced +*/ +static void initialrulename (lua_State *L, TTree *grammar, int frule) { + if (sib1(grammar)->key == 0) { /* initial rule is not referenced? */ + int n = lua_rawlen(L, -1) + 1; /* index for name */ + lua_pushvalue(L, frule); /* rule's name */ + lua_rawseti(L, -2, n); /* ktable was on the top of the stack */ + sib1(grammar)->key = n; + } +} + + +static TTree *newgrammar (lua_State *L, int arg) { + int treesize; + int frule = lua_gettop(L) + 2; /* position of first rule's key */ + int n = collectrules(L, arg, &treesize); + TTree *g = newtree(L, treesize); + luaL_argcheck(L, n <= MAXRULES, arg, "grammar has too many rules"); + g->tag = TGrammar; g->u.n = n; + lua_newtable(L); /* create 'ktable' */ + lua_setuservalue(L, -2); + buildgrammar(L, g, frule, n); + lua_getuservalue(L, -1); /* get 'ktable' for new tree */ + finalfix(L, frule - 1, g, sib1(g)); + initialrulename(L, g, frule); + verifygrammar(L, g); + lua_pop(L, 1); /* remove 'ktable' */ + lua_insert(L, -(n * 2 + 2)); /* move new table to proper position */ + lua_pop(L, n * 2 + 1); /* remove position table + rule pairs */ + return g; /* new table at the top of the stack */ +} + +/* }====================================================== */ + + +static Instruction *prepcompile (lua_State *L, Pattern *p, int idx) { + lua_getuservalue(L, idx); /* push 'ktable' (may be used by 'finalfix') */ + finalfix(L, 0, NULL, p->tree); + lua_pop(L, 1); /* remove 'ktable' */ + return compile(L, p); +} + + +static int lp_printtree (lua_State *L) { + TTree *tree = getpatt(L, 1, NULL); + int c = lua_toboolean(L, 2); + if (c) { + lua_getuservalue(L, 1); /* push 'ktable' (may be used by 'finalfix') */ + finalfix(L, 0, NULL, tree); + lua_pop(L, 1); /* remove 'ktable' */ + } + printktable(L, 1); + printtree(tree, 0); + return 0; +} + + +static int lp_printcode (lua_State *L) { + Pattern *p = getpattern(L, 1); + printktable(L, 1); + if (p->code == NULL) /* not compiled yet? */ + prepcompile(L, p, 1); + printpatt(p->code, p->codesize); + return 0; +} + + +/* +** Get the initial position for the match, interpreting negative +** values from the end of the subject +*/ +static size_t initposition (lua_State *L, size_t len) { + lua_Integer ii = luaL_optinteger(L, 3, 1); + if (ii > 0) { /* positive index? */ + if ((size_t)ii <= len) /* inside the string? */ + return (size_t)ii - 1; /* return it (corrected to 0-base) */ + else return len; /* crop at the end */ + } + else { /* negative index */ + if ((size_t)(-ii) <= len) /* inside the string? */ + return len - ((size_t)(-ii)); /* return position from the end */ + else return 0; /* crop at the beginning */ + } +} + + +/* +** Main match function +*/ +static int lp_match (lua_State *L) { + Capture capture[INITCAPSIZE]; + const char *r; + size_t l; + Pattern *p = (getpatt(L, 1, NULL), getpattern(L, 1)); + Instruction *code = (p->code != NULL) ? p->code : prepcompile(L, p, 1); + const char *s = luaL_checklstring(L, SUBJIDX, &l); + size_t i = initposition(L, l); + int ptop = lua_gettop(L); + byte labelf; /* labeled failure */ + const char *sfail = NULL; /* labeled failure */ + lua_pushnil(L); /* initialize subscache */ + lua_pushlightuserdata(L, capture); /* initialize caplistidx */ + lua_getuservalue(L, 1); /* initialize penvidx */ + r = match(L, s, s + i, s + l, code, capture, ptop, &labelf, &sfail); /* labeled failure */ + if (r == NULL) { /* labeled failure begin */ + lua_pushnil(L); + lua_pushinteger(L, labelf); + lua_pushstring(L, sfail); /* Pushing the subject where the failure occurred */ + return 3; + } /* labeled failure end */ + return getcaptures(L, s, r, ptop); +} + + + +/* +** {====================================================== +** Library creation and functions not related to matching +** ======================================================= +*/ + +/* maximum limit for stack size */ +#define MAXLIM (INT_MAX / 100) + +static int lp_setmax (lua_State *L) { + lua_Integer lim = luaL_checkinteger(L, 1); + luaL_argcheck(L, 0 < lim && lim <= MAXLIM, 1, "out of range"); + lua_settop(L, 1); + lua_setfield(L, LUA_REGISTRYINDEX, MAXSTACKIDX); + return 0; +} + + +static int lp_version (lua_State *L) { + lua_pushstring(L, VERSION); + return 1; +} + + +static int lp_type (lua_State *L) { + if (testpattern(L, 1)) + lua_pushliteral(L, "pattern"); + else + lua_pushnil(L); + return 1; +} + + +int lp_gc (lua_State *L) { + Pattern *p = getpattern(L, 1); + realloccode(L, p, 0); /* delete code block */ + return 0; +} + + +static void createcat (lua_State *L, const char *catname, int (catf) (int)) { + TTree *t = newcharset(L); + int i; + for (i = 0; i <= UCHAR_MAX; i++) + if (catf(i)) setchar(treebuffer(t), i); + lua_setfield(L, -2, catname); +} + + +static int lp_locale (lua_State *L) { + if (lua_isnoneornil(L, 1)) { + lua_settop(L, 0); + lua_createtable(L, 0, 12); + } + else { + luaL_checktype(L, 1, LUA_TTABLE); + lua_settop(L, 1); + } + createcat(L, "alnum", isalnum); + createcat(L, "alpha", isalpha); + createcat(L, "cntrl", iscntrl); + createcat(L, "digit", isdigit); + createcat(L, "graph", isgraph); + createcat(L, "lower", islower); + createcat(L, "print", isprint); + createcat(L, "punct", ispunct); + createcat(L, "space", isspace); + createcat(L, "upper", isupper); + createcat(L, "xdigit", isxdigit); + return 1; +} + + +static struct luaL_Reg pattreg[] = { + {"ptree", lp_printtree}, + {"pcode", lp_printcode}, + {"match", lp_match}, + {"B", lp_behind}, + {"V", lp_V}, + {"C", lp_simplecapture}, + {"Cc", lp_constcapture}, + {"Cmt", lp_matchtime}, + {"Cb", lp_backref}, + {"Carg", lp_argcapture}, + {"Cp", lp_poscapture}, + {"Cs", lp_substcapture}, + {"Ct", lp_tablecapture}, + {"Cf", lp_foldcapture}, + {"Cg", lp_groupcapture}, + {"P", lp_P}, + {"S", lp_set}, + {"R", lp_range}, + {"locale", lp_locale}, + {"version", lp_version}, + {"setmaxstack", lp_setmax}, + {"type", lp_type}, + {"T", lp_throw}, /* labeled failure throw */ + {"Rec", lp_recovery}, /* labeled failure choice */ + {NULL, NULL} +}; + + +static struct luaL_Reg metareg[] = { + {"__mul", lp_seq}, + {"__add", lp_choice}, + {"__pow", lp_star}, + {"__gc", lp_gc}, + {"__len", lp_and}, + {"__div", lp_divcapture}, + {"__unm", lp_not}, + {"__sub", lp_sub}, + {NULL, NULL} +}; + + +int luaopen_lpeglabel (lua_State *L); /* labeled failure */ +int luaopen_lpeglabel (lua_State *L) { /* labeled failure */ + luaL_newmetatable(L, PATTERN_T); + lua_pushnumber(L, MAXBACK); /* initialize maximum backtracking */ + lua_setfield(L, LUA_REGISTRYINDEX, MAXSTACKIDX); + luaL_setfuncs(L, metareg, 0); + luaL_newlib(L, pattreg); + lua_pushvalue(L, -1); + lua_setfield(L, -3, "__index"); + return 1; +} + +/* }====================================================== */ diff --git a/06/lpeglabel/lptree.h b/06/lpeglabel/lptree.h new file mode 100644 index 0000000..b75f323 --- /dev/null +++ b/06/lpeglabel/lptree.h @@ -0,0 +1,82 @@ +/* +** $Id: lptree.h,v 1.2 2013/03/24 13:51:12 roberto Exp $ +*/ + +#if !defined(lptree_h) +#define lptree_h + + +#include "lptypes.h" + + +/* +** types of trees +*/ +typedef enum TTag { + TChar = 0, TSet, TAny, /* standard PEG elements */ + TTrue, TFalse, + TRep, + TSeq, TChoice, + TNot, TAnd, + TCall, + TOpenCall, + TRule, /* sib1 is rule's pattern, sib2 is 'next' rule */ + TGrammar, /* sib1 is initial (and first) rule */ + TBehind, /* match behind */ + TCapture, /* regular capture */ + TRunTime, /* run-time capture */ + TThrow, TRecov /* labeled failure */ +} TTag; + +/* number of siblings for each tree */ +extern const byte numsiblings[]; + + +/* +** Tree trees +** The first sibling of a tree (if there is one) is immediately after +** the tree. A reference to a second sibling (ps) is its position +** relative to the position of the tree itself. A key in ktable +** uses the (unique) address of the original tree that created that +** entry. NULL means no data. +*/ +typedef struct TTree { + byte tag; + byte cap; /* kind of capture (if it is a capture) */ + unsigned short key; /* key in ktable for Lua data (0 if no key) */ + union { + int n; /* occasional counter */ + int label; /* labeled failure */ + struct { /* labeled failure */ + int ps; /* occasional second sibling */ + int plab; /* occasional label set */ + } s; /* labeled failure */ + } u; +} TTree; + + +/* +** A complete pattern has its tree plus, if already compiled, +** its corresponding code +*/ +typedef struct Pattern { + union Instruction *code; + int codesize; + TTree tree[1]; +} Pattern; + + +/* number of siblings for each tree */ +extern const byte numsiblings[]; + +/* access to siblings */ +#define sib1(t) ((t) + 1) +#define sib2(t) ((t) + (t)->u.s.ps) + + + + + + +#endif + diff --git a/06/lpeglabel/lptypes.h b/06/lpeglabel/lptypes.h new file mode 100644 index 0000000..81f0fdc --- /dev/null +++ b/06/lpeglabel/lptypes.h @@ -0,0 +1,171 @@ +/* +** $Id: lptypes.h,v 1.14 2015/09/28 17:17:41 roberto Exp $ +** LPeg - PEG pattern matching for Lua +** Copyright 2007-2015, Lua.org & PUC-Rio (see 'lpeg.html' for license) +** written by Roberto Ierusalimschy +*/ + +#if !defined(lptypes_h) +#define lptypes_h + + +#if !defined(LPEG_DEBUG) +#define NDEBUG +#endif + +#include +#include + +#include "lua.h" + + +#define VERSION "1.0.0" + + +#define PATTERN_T "lpeg-pattern" +#define MAXSTACKIDX "lpeg-maxstack" + + +/* +** compatibility with Lua 5.1 +*/ +#if (LUA_VERSION_NUM == 501) + +#define lp_equal lua_equal + +#define lua_getuservalue lua_getfenv +#define lua_setuservalue lua_setfenv + +#define lua_rawlen lua_objlen + +#define luaL_setfuncs(L,f,n) luaL_register(L,NULL,f) +#define luaL_newlib(L,f) luaL_register(L,"lpeg",f) + +#endif + + +#if !defined(lp_equal) +#define lp_equal(L,idx1,idx2) lua_compare(L,(idx1),(idx2),LUA_OPEQ) +#endif + + +/* default maximum size for call/backtrack stack */ +#if !defined(MAXBACK) +#define MAXBACK 400 +#endif + + +/* maximum number of rules in a grammar */ +#if !defined(MAXRULES) +#define MAXRULES 1000 +#endif + + + +/* initial size for capture's list */ +#define INITCAPSIZE 32 + + +/* index, on Lua stack, for subject */ +#define SUBJIDX 2 + +/* number of fixed arguments to 'match' (before capture arguments) */ +#define FIXEDARGS 3 + +/* index, on Lua stack, for capture list */ +#define caplistidx(ptop) ((ptop) + 2) + +/* index, on Lua stack, for pattern's ktable */ +#define ktableidx(ptop) ((ptop) + 3) + +/* index, on Lua stack, for backtracking stack */ +#define stackidx(ptop) ((ptop) + 4) + + + +typedef unsigned char byte; + + +#define BITSPERCHAR 8 + +#define CHARSETSIZE ((UCHAR_MAX/BITSPERCHAR) + 1) + + + +typedef struct Charset { + byte cs[CHARSETSIZE]; +} Charset; + + + +#define loopset(v,b) { int v; for (v = 0; v < CHARSETSIZE; v++) {b;} } + +/* access to charset */ +#define treebuffer(t) ((byte *)((t) + 1)) + +/* number of slots needed for 'n' bytes */ +#define bytes2slots(n) (((n) - 1) / sizeof(TTree) + 1) + +/* set 'b' bit in charset 'cs' */ +#define setchar(cs,b) ((cs)[(b) >> 3] |= (1 << ((b) & 7))) + + +/* +** in capture instructions, 'kind' of capture and its offset are +** packed in field 'aux', 4 bits for each +*/ +#define getkind(op) ((op)->i.aux & 0xF) +#define getoff(op) (((op)->i.aux >> 4) & 0xF) +#define joinkindoff(k,o) ((k) | ((o) << 4)) + +#define MAXOFF 0xF +#define MAXAUX 0xFF + + +/* maximum number of bytes to look behind */ +#define MAXBEHIND MAXAUX + + +/* maximum size (in elements) for a pattern */ +#define MAXPATTSIZE (SHRT_MAX - 10) + + +/* size (in elements) for an instruction plus extra l bytes */ +#define instsize(l) (((l) + sizeof(Instruction) - 1)/sizeof(Instruction) + 1) + + +/* size (in elements) for a ISet instruction */ +#define CHARSETINSTSIZE instsize(CHARSETSIZE) + +/* size (in elements) for a IFunc instruction */ +#define funcinstsize(p) ((p)->i.aux + 2) + + + +#define testchar(st,c) (((int)(st)[((c) >> 3)] & (1 << ((c) & 7)))) + +/* labeled failure begin */ +#define MAXLABELS (UCHAR_MAX + 1) + +#define LABELSETSIZE CHARSETSIZE + +typedef Charset Labelset; + +#define setlabel setchar + +#define testlabel testchar + +/* access to labelset */ +#define treelabelset(t) ((byte *)((t) + (t)->u.s.plab)) + +#define IDXLFAIL 0 + +#define LFAIL 0 + +/* update the farthest failure */ +#define updatefarthest(s1,s2) { if ((s2) > (s1)) s1 = s2; } + +/* labeled failure end */ + +#endif + diff --git a/06/lpeglabel/lpvm.c b/06/lpeglabel/lpvm.c new file mode 100644 index 0000000..c256083 --- /dev/null +++ b/06/lpeglabel/lpvm.c @@ -0,0 +1,429 @@ +/* +** $Id: lpvm.c,v 1.6 2015/09/28 17:01:25 roberto Exp $ +** Copyright 2007, Lua.org & PUC-Rio (see 'lpeg.html' for license) +*/ + +#include +#include + + +#include "lua.h" +#include "lauxlib.h" + +#include "lpcap.h" +#include "lptypes.h" +#include "lpvm.h" +#include "lpprint.h" + + +/* initial size for call/backtrack stack */ +#if !defined(INITBACK) +#define INITBACK MAXBACK +#endif + + +#define getoffset(p) (((p) + 1)->offset) + +static const Instruction giveup = {{IGiveup, 0, 0}}; + +/* labeled failure */ +static void setlabelfail(Labelset *ls) { + loopset(i, ls->cs[i] = 0); + ls->cs[IDXLFAIL] = 1; +} +/* labeled failure end */ + +/* +** {====================================================== +** Virtual Machine +** ======================================================= +*/ + + +typedef struct Stack { + const char *s; /* saved position (or NULL for calls) */ + const Instruction *p; /* next instruction */ + const Labelset *ls; /* labeled failure */ + int caplevel; +} Stack; + + +#define getstackbase(L, ptop) ((Stack *)lua_touserdata(L, stackidx(ptop))) + + +/* +** Double the size of the array of captures +*/ +static Capture *doublecap (lua_State *L, Capture *cap, int captop, int ptop) { + Capture *newc; + if (captop >= INT_MAX/((int)sizeof(Capture) * 2)) + luaL_error(L, "too many captures"); + newc = (Capture *)lua_newuserdata(L, captop * 2 * sizeof(Capture)); + memcpy(newc, cap, captop * sizeof(Capture)); + lua_replace(L, caplistidx(ptop)); + return newc; +} + + +/* +** Double the size of the stack +*/ +static Stack *doublestack (lua_State *L, Stack **stacklimit, int ptop) { + Stack *stack = getstackbase(L, ptop); + Stack *newstack; + int n = *stacklimit - stack; /* current stack size */ + int max, newn; + lua_getfield(L, LUA_REGISTRYINDEX, MAXSTACKIDX); + max = lua_tointeger(L, -1); /* maximum allowed size */ + lua_pop(L, 1); + if (n >= max) /* already at maximum size? */ + luaL_error(L, "backtrack stack overflow (current limit is %d)", max); + newn = 2 * n; /* new size */ + if (newn > max) newn = max; + newstack = (Stack *)lua_newuserdata(L, newn * sizeof(Stack)); + memcpy(newstack, stack, n * sizeof(Stack)); + lua_replace(L, stackidx(ptop)); + *stacklimit = newstack + newn; + return newstack + n; /* return next position */ +} + + +/* +** Interpret the result of a dynamic capture: false -> fail; +** true -> keep current position; number -> next position. +** Return new subject position. 'fr' is stack index where +** is the result; 'curr' is current subject position; 'limit' +** is subject's size. +*/ +static int resdyncaptures (lua_State *L, int fr, int curr, int limit) { + lua_Integer res; + if (!lua_toboolean(L, fr)) { /* false value? */ + lua_settop(L, fr - 1); /* remove results */ + return -1; /* and fail */ + } + else if (lua_isboolean(L, fr)) /* true? */ + res = curr; /* keep current position */ + else { + res = lua_tointeger(L, fr) - 1; /* new position */ + if (res < curr || res > limit) + luaL_error(L, "invalid position returned by match-time capture"); + } + lua_remove(L, fr); /* remove first result (offset) */ + return res; +} + + +/* +** Add capture values returned by a dynamic capture to the capture list +** 'base', nested inside a group capture. 'fd' indexes the first capture +** value, 'n' is the number of values (at least 1). +*/ +static void adddyncaptures (const char *s, Capture *base, int n, int fd) { + int i; + /* Cgroup capture is already there */ + assert(base[0].kind == Cgroup && base[0].siz == 0); + base[0].idx = 0; /* make it an anonymous group */ + for (i = 1; i <= n; i++) { /* add runtime captures */ + base[i].kind = Cruntime; + base[i].siz = 1; /* mark it as closed */ + base[i].idx = fd + i - 1; /* stack index of capture value */ + base[i].s = s; + } + base[i].kind = Cclose; /* close group */ + base[i].siz = 1; + base[i].s = s; +} + + +/* +** Remove dynamic captures from the Lua stack (called in case of failure) +*/ +static int removedyncap (lua_State *L, Capture *capture, + int level, int last) { + int id = finddyncap(capture + level, capture + last); /* index of 1st cap. */ + int top = lua_gettop(L); + if (id == 0) return 0; /* no dynamic captures? */ + lua_settop(L, id - 1); /* remove captures */ + return top - id + 1; /* number of values removed */ +} + + + + +/* +** Opcode interpreter +*/ +const char *match (lua_State *L, const char *o, const char *s, const char *e, + Instruction *op, Capture *capture, int ptop, byte *labelf, const char **sfail) { /* labeled failure */ + Stack stackbase[INITBACK]; + Stack *stacklimit = stackbase + INITBACK; + Stack *stack = stackbase; /* point to first empty slot in stack */ + int capsize = INITCAPSIZE; + int captop = 0; /* point to first empty slot in captures */ + int ndyncap = 0; /* number of dynamic captures (in Lua stack) */ + const Instruction *p = op; /* current instruction */ + const Instruction *pk = NULL; /* resume instruction */ + Labelset lsfail; + setlabelfail(&lsfail); + stack->p = &giveup; stack->s = s; stack->ls = &lsfail; stack->caplevel = 0; stack++; /* labeled failure */ + *sfail = s; /* labeled failure */ + lua_pushlightuserdata(L, stackbase); + for (;;) { +#if defined(DEBUG) + printinst(op, p); + printf("s: |%s| stck:%d, dyncaps:%d, caps:%d ", + s, stack - getstackbase(L, ptop), ndyncap, captop); + printcaplist(capture, capture + captop); +#endif + assert(stackidx(ptop) + ndyncap == lua_gettop(L) && ndyncap <= captop); + switch ((Opcode)p->i.code) { + case IEnd: { + assert(stack == getstackbase(L, ptop) + 1); + capture[captop].kind = Cclose; + capture[captop].s = NULL; + return s; + } + case IGiveup: { + assert(stack == getstackbase(L, ptop)); + return NULL; + } + case IRet: { + assert(stack > getstackbase(L, ptop) && (stack - 1)->s == NULL); + p = (--stack)->p; + continue; + } + case IAny: { + if (s < e) { p++; s++; } + else { + *labelf = LFAIL; /* labeled failure */ + pk = p + 1; + updatefarthest(*sfail, s); /*labeled failure */ + goto fail; + } + continue; + } + case ITestAny: { + if (s < e) p += 2; + else p += getoffset(p); + continue; + } + case IChar: { + if ((byte)*s == p->i.aux && s < e) { p++; s++; } + else { + *labelf = LFAIL; /* labeled failure */ + pk = p + 1; + updatefarthest(*sfail, s); /*labeled failure */ + goto fail; + } + continue; + } + case ITestChar: { + if ((byte)*s == p->i.aux && s < e) p += 2; + else p += getoffset(p); + continue; + } + case ISet: { + int c = (byte)*s; + if (testchar((p+1)->buff, c) && s < e) + { p += CHARSETINSTSIZE; s++; } + else { + *labelf = LFAIL; /* labeled failure */ + pk = p + CHARSETINSTSIZE; + updatefarthest(*sfail, s); /*labeled failure */ + goto fail; + } + continue; + } + case ITestSet: { + int c = (byte)*s; + if (testchar((p + 2)->buff, c) && s < e) + p += 1 + CHARSETINSTSIZE; + else p += getoffset(p); + continue; + } + case IBehind: { + int n = p->i.aux; + if (n > s - o) { + *labelf = LFAIL; /* labeled failure */ + pk = p + 1; + updatefarthest(*sfail, s); /*labeled failure */ + goto fail; + } + s -= n; p++; + continue; + } + case ISpan: { + for (; s < e; s++) { + int c = (byte)*s; + if (!testchar((p+1)->buff, c)) break; + } + p += CHARSETINSTSIZE; + continue; + } + case IJmp: { + p += getoffset(p); + continue; + } + case IChoice: { + if (stack == stacklimit) + stack = doublestack(L, &stacklimit, ptop); + stack->p = p + getoffset(p); + stack->s = s; + stack->ls = &lsfail; /* labeled failure */ + stack->caplevel = captop; + stack++; + p += 2; + continue; + } + case IRecov: { /* labeled failure */ + if (stack == stacklimit) + stack = doublestack(L, &stacklimit, ptop); + stack->p = p + getoffset(p); + stack->s = NULL; + stack->ls = (const Labelset *) ((p + 2)->buff); + stack->caplevel = captop; + stack++; + p += (CHARSETINSTSIZE - 1) + 2; + continue; + } + case ICall: { + if (stack == stacklimit) + stack = doublestack(L, &stacklimit, ptop); + stack->s = NULL; + stack->p = p + 2; /* save return address */ + stack->ls = NULL; + stack++; + p += getoffset(p); + continue; + } + case ICommit: { + assert(stack > getstackbase(L, ptop) && (stack - 1)->ls != NULL); /* labeled failure */ + /*assert((stack - 1)->s != NULL); labeled failure: IRecov does not push s onto the stack */ + stack--; + p += getoffset(p); + continue; + } + case IPartialCommit: { + assert(stack > getstackbase(L, ptop) && (stack - 1)->s != NULL); + (stack - 1)->s = s; + (stack - 1)->caplevel = captop; + p += getoffset(p); + continue; + } + case IBackCommit: { + assert(stack > getstackbase(L, ptop) && (stack - 1)->s != NULL); + s = (--stack)->s; + captop = stack->caplevel; + p += getoffset(p); + continue; + } + case IThrow: { /* labeled failure */ + *labelf = p->i.aux; + pk = p + 1; + *sfail = s; + goto fail; + } + case IFailTwice: + assert(stack > getstackbase(L, ptop)); + stack--; + /* go through */ + case IFail: + *labelf = LFAIL; /* labeled failure */ + pk = NULL; + updatefarthest(*sfail, s); /*labeled failure */ + fail: { /* pattern failed: try to backtrack */ + const Labelset *auxlab = NULL; + Stack *pstack = stack; + do { /* remove pending calls */ + assert(pstack > getstackbase(L, ptop)); + auxlab = (--pstack)->ls; + } while (auxlab == NULL || !(pstack->p == &giveup || testlabel(pstack->ls->cs, *labelf))); + if (pstack->s != NULL) { /* labeled failure: giveup or backtrack frame */ + stack = pstack; + s = stack->s; + if (ndyncap > 0) /* is there matchtime captures? */ + ndyncap -= removedyncap(L, capture, stack->caplevel, captop); + captop = stack->caplevel; + } else { /* labeled failure: recovery frame */ + if (stack == stacklimit) + stack = doublestack(L, &stacklimit, ptop); + stack->s = NULL; + stack->p = pk; /* save return address */ + stack->ls = NULL; + stack->caplevel = captop; /* TODO: really necessary?? */ + stack++; + } + p = pstack->p; + continue; + } + case ICloseRunTime: { + CapState cs; + int rem, res, n; + int fr = lua_gettop(L) + 1; /* stack index of first result */ + cs.s = o; cs.L = L; cs.ocap = capture; cs.ptop = ptop; + n = runtimecap(&cs, capture + captop, s, &rem); /* call function */ + captop -= n; /* remove nested captures */ + fr -= rem; /* 'rem' items were popped from Lua stack */ + res = resdyncaptures(L, fr, s - o, e - o); /* get result */ + if (res == -1) { /* fail? */ + *labelf = LFAIL; /* labeled failure */ + pk = NULL; + updatefarthest(*sfail, s); /*labeled failure */ + goto fail; + } + s = o + res; /* else update current position */ + n = lua_gettop(L) - fr + 1; /* number of new captures */ + ndyncap += n - rem; /* update number of dynamic captures */ + if (n > 0) { /* any new capture? */ + if ((captop += n + 2) >= capsize) { + capture = doublecap(L, capture, captop, ptop); + capsize = 2 * captop; + } + /* add new captures to 'capture' list */ + adddyncaptures(s, capture + captop - n - 2, n, fr); + } + p++; + continue; + } + case ICloseCapture: { + const char *s1 = s; + assert(captop > 0); + /* if possible, turn capture into a full capture */ + if (capture[captop - 1].siz == 0 && + s1 - capture[captop - 1].s < UCHAR_MAX) { + capture[captop - 1].siz = s1 - capture[captop - 1].s + 1; + p++; + continue; + } + else { + capture[captop].siz = 1; /* mark entry as closed */ + capture[captop].s = s; + goto pushcapture; + } + } + case IOpenCapture: + capture[captop].siz = 0; /* mark entry as open */ + capture[captop].s = s; + goto pushcapture; + case IFullCapture: + capture[captop].siz = getoff(p) + 1; /* save capture size */ + capture[captop].s = s - getoff(p); + /* goto pushcapture; */ + pushcapture: { + capture[captop].idx = p->i.key; + capture[captop].kind = getkind(p); + if (++captop >= capsize) { + capture = doublecap(L, capture, captop, ptop); + capsize = 2 * captop; + } + p++; + continue; + } + default: assert(0); return NULL; + } + } +} + +/* }====================================================== */ + + diff --git a/06/lpeglabel/lpvm.h b/06/lpeglabel/lpvm.h new file mode 100644 index 0000000..bcfc22f --- /dev/null +++ b/06/lpeglabel/lpvm.h @@ -0,0 +1,60 @@ +/* +** $Id: lpvm.h,v 1.3 2014/02/21 13:06:41 roberto Exp $ +*/ + +#if !defined(lpvm_h) +#define lpvm_h + +#include "lpcap.h" + + +/* Virtual Machine's instructions */ +typedef enum Opcode { + IAny, /* if no char, fail */ + IChar, /* if char != aux, fail */ + ISet, /* if char not in buff, fail */ + ITestAny, /* in no char, jump to 'offset' */ + ITestChar, /* if char != aux, jump to 'offset' */ + ITestSet, /* if char not in buff, jump to 'offset' */ + ISpan, /* read a span of chars in buff */ + IBehind, /* walk back 'aux' characters (fail if not possible) */ + IRet, /* return from a rule */ + IEnd, /* end of pattern */ + IChoice, /* stack a choice; next fail will jump to 'offset' */ + IJmp, /* jump to 'offset' */ + ICall, /* call rule at 'offset' */ + IOpenCall, /* call rule number 'key' (must be closed to a ICall) */ + ICommit, /* pop choice and jump to 'offset' */ + IPartialCommit, /* update top choice to current position and jump */ + IBackCommit, /* "fails" but jump to its own 'offset' */ + IFailTwice, /* pop one choice and then fail */ + IFail, /* go back to saved state on choice and jump to saved offset */ + IGiveup, /* internal use */ + IFullCapture, /* complete capture of last 'off' chars */ + IOpenCapture, /* start a capture */ + ICloseCapture, + ICloseRunTime, + IThrow, /* "fails" with a specific label labeled failure */ + IRecov /* stack a recovery; next fail with label 'f' will jump to 'offset' */ +} Opcode; + + + +typedef union Instruction { + struct Inst { + byte code; + byte aux; + short key; + } i; + int offset; + byte buff[1]; +} Instruction; + + +void printpatt (Instruction *p, int n); +const char *match (lua_State *L, const char *o, const char *s, const char *e, + Instruction *op, Capture *capture, int ptop, byte *labelf, const char **sfail); /* labeled failure */ + + +#endif + diff --git a/06/lpeglabel/makefile b/06/lpeglabel/makefile new file mode 100644 index 0000000..31b3e14 --- /dev/null +++ b/06/lpeglabel/makefile @@ -0,0 +1,57 @@ +LIBNAME = lpeglabel +LUADIR = ../lua-bootstrap/include/ + +COPT = -O2 +# COPT = -DLPEG_DEBUG -g + +CWARNS = -Wall -Wextra -pedantic \ + -Waggregate-return \ + -Wcast-align \ + -Wcast-qual \ + -Wdisabled-optimization \ + -Wpointer-arith \ + -Wshadow \ + -Wsign-compare \ + -Wundef \ + -Wwrite-strings \ + -Wbad-function-cast \ + -Wdeclaration-after-statement \ + -Wmissing-prototypes \ + -Wnested-externs \ + -Wstrict-prototypes \ +# -Wunreachable-code \ + + +CFLAGS = $(CWARNS) -nostdinc -B ../../05/tcc-bootstrap -I ../../05/musl-bootstrap/include -I$(LUADIR) +CC = ../../05/tcc-0.9.27/tcc + +FILES = lpvm.o lpcap.o lptree.o lpcode.o lpprint.o + +# For Linux +linux: + make lpeglabel.so "DLLFLAGS = -shared -nostdlib -B ../../05/tcc-bootstrap " + +# # For Mac OS +# macosx: +# make lpeglabel.so "DLLFLAGS = -bundle -undefined dynamic_lookup" + +lpeglabel.so: $(FILES) + $(CC) $(DLLFLAGS) $(FILES) -o lpeglabel.so ../lua-bootstrap/lib/liblua.a ../../05/musl-bootstrap/lib/libc.a + +$(FILES): makefile + +test: test.lua testlabel.lua testerrors.lua relabel.lua lpeglabel.so + lua test.lua + lua testlabel.lua + lua testerrors.lua + +clean: + rm -f $(FILES) lpeglabel.so + + +lpcap.o: lpcap.c lpcap.h lptypes.h +lpcode.o: lpcode.c lptypes.h lpcode.h lptree.h lpvm.h lpcap.h +lpprint.o: lpprint.c lptypes.h lpprint.h lptree.h lpvm.h lpcap.h +lptree.o: lptree.c lptypes.h lpcap.h lpcode.h lptree.h lpvm.h lpprint.h +lpvm.o: lpvm.c lpcap.h lptypes.h lpvm.h lpprint.h lptree.h + diff --git a/06/lpeglabel/old_makefile b/06/lpeglabel/old_makefile new file mode 100644 index 0000000..6936888 --- /dev/null +++ b/06/lpeglabel/old_makefile @@ -0,0 +1,60 @@ + +COPT = -O2 +# COPT = -DLPEG_DEBUG -g + +CWARNS = -Wall -Wextra -pedantic \ + -Waggregate-return \ + -Wcast-align \ + -Wcast-qual \ + -Wdisabled-optimization \ + -Wpointer-arith \ + -Wshadow \ + -Wsign-compare \ + -Wundef \ + -Wwrite-strings \ + -Wbad-function-cast \ + -Wdeclaration-after-statement \ + -Wmissing-prototypes \ + -Wnested-externs \ + -Wstrict-prototypes \ +# -Wunreachable-code \ + + +CFLAGS = $(CWARNS) -nostdinc -B ../../05/tcc-bootstrap -I ../../05/musl-bootstrap/include -I$(LUADIR) +CC = ../../05/tcc-0.9.27/tcc + +FILES = lplvm.o lplcap.o lpltree.o lplcode.o lplprint.o +# For Linux +linux: + make lpeglabel.so "DLLFLAGS = -shared -nostdlib -B ../../05/tcc-bootstrap " + +# For Mac OS +# macosx: +# make lpeglabel.so "DLLFLAGS = -bundle -undefined dynamic_lookup" + +# For Windows +# windows: +# make lpeglabel.dll "DLLFLAGS = -shared -fPIC" + +lpeglabel.so: $(FILES) + $(CC) $(DLLFLAGS) $(FILES) -o lpeglabel.so ../lua-bootstrap/lib/liblua.a ../../05/musl-bootstrap/lib/libc.a +lpeglabel.dll: $(FILES) + $(CC) $(DLLFLAGS) $(FILES) -o lpeglabel.dll $(LUADIR)/bin/lua53.dll + +$(FILES): makefile + +test: test.lua testlabel.lua testrelabelparser.lua relabel.lua lpeglabel.so + lua test.lua + lua testlabel.lua + lua testrelabelparser.lua + +clean: + rm -f $(FILES) lpeglabel.so + + +lplcap.o: lplcap.c lplcap.h lpltypes.h +lplcode.o: lplcode.c lpltypes.h lplcode.h lpltree.h lplvm.h lplcap.h +lplprint.o: lplprint.c lpltypes.h lplprint.h lpltree.h lplvm.h lplcap.h +lpltree.o: lpltree.c lpltypes.h lplcap.h lplcode.h lpltree.h lplvm.h lplprint.h +lplvm.o: lplvm.c lplcap.h lpltypes.h lplvm.h lplprint.h lpltree.h + diff --git a/06/lpeglabel/relabel.lua b/06/lpeglabel/relabel.lua new file mode 100644 index 0000000..1089d34 --- /dev/null +++ b/06/lpeglabel/relabel.lua @@ -0,0 +1,398 @@ +-- $Id: re.lua,v 1.44 2013/03/26 20:11:40 roberto Exp $ + +-- imported functions and modules +local tonumber, type, print, error, ipairs = tonumber, type, print, error, ipairs +local pcall = pcall +local setmetatable = setmetatable +local unpack, tinsert, concat = table.unpack or unpack, table.insert, table.concat +local rep = string.rep +local m = m + +-- 'm' will be used to parse expressions, and 'mm' will be used to +-- create expressions; that is, 're' runs on 'm', creating patterns +-- on 'mm' +local mm = m + +-- pattern's metatable +local mt = getmetatable(mm.P(0)) + + + +-- No more global accesses after this point +local version = _VERSION +if version == "Lua 5.2" then _ENV = nil end + + +local any = m.P(1) +local dummy = mm.P(false) + + +local errinfo = { + {"NoPatt", "no pattern found"}, + {"ExtraChars", "unexpected characters after the pattern"}, + + {"ExpPatt1", "expected a pattern after '/' or '//{...}'"}, + + {"ExpPatt2", "expected a pattern after '&'"}, + {"ExpPatt3", "expected a pattern after '!'"}, + + {"ExpPatt4", "expected a pattern after '('"}, + {"ExpPatt5", "expected a pattern after ':'"}, + {"ExpPatt6", "expected a pattern after '{~'"}, + {"ExpPatt7", "expected a pattern after '{|'"}, + + {"ExpPatt8", "expected a pattern after '<-'"}, + + {"ExpPattOrClose", "expected a pattern or closing '}' after '{'"}, + + {"ExpNum", "expected a number after '^', '+' or '-' (no space)"}, + {"ExpCap", "expected a string, number, '{}' or name after '->'"}, + + {"ExpName1", "expected the name of a rule after '=>'"}, + {"ExpName2", "expected the name of a rule after '=' (no space)"}, + {"ExpName3", "expected the name of a rule after '<' (no space)"}, + + {"ExpLab1", "expected at least one label after '{'"}, + {"ExpLab2", "expected a label after the comma"}, + + {"ExpNameOrLab", "expected a name or label after '%' (no space)"}, + + {"ExpItem", "expected at least one item after '[' or '^'"}, + + {"MisClose1", "missing closing ')'"}, + {"MisClose2", "missing closing ':}'"}, + {"MisClose3", "missing closing '~}'"}, + {"MisClose4", "missing closing '|}'"}, + {"MisClose5", "missing closing '}'"}, -- for the captures + + {"MisClose6", "missing closing '>'"}, + {"MisClose7", "missing closing '}'"}, -- for the labels + + {"MisClose8", "missing closing ']'"}, + + {"MisTerm1", "missing terminating single quote"}, + {"MisTerm2", "missing terminating double quote"}, +} + +local errmsgs = {} +local labels = {} + +for i, err in ipairs(errinfo) do + errmsgs[i] = err[2] + labels[err[1]] = i +end + +local function expect (pattern, labelname) + local label = labels[labelname] + return pattern + m.T(label) +end + + +-- Pre-defined names +local Predef = { nl = m.P"\n" } +local tlabels = {} + + +local mem +local fmem +local gmem + + +local function updatelocale () + mm.locale(Predef) + Predef.a = Predef.alpha + Predef.c = Predef.cntrl + Predef.d = Predef.digit + Predef.g = Predef.graph + Predef.l = Predef.lower + Predef.p = Predef.punct + Predef.s = Predef.space + Predef.u = Predef.upper + Predef.w = Predef.alnum + Predef.x = Predef.xdigit + Predef.A = any - Predef.a + Predef.C = any - Predef.c + Predef.D = any - Predef.d + Predef.G = any - Predef.g + Predef.L = any - Predef.l + Predef.P = any - Predef.p + Predef.S = any - Predef.s + Predef.U = any - Predef.u + Predef.W = any - Predef.w + Predef.X = any - Predef.x + mem = {} -- restart memoization + fmem = {} + gmem = {} + local mt = {__mode = "v"} + setmetatable(mem, mt) + setmetatable(fmem, mt) + setmetatable(gmem, mt) +end + + +updatelocale() + + + +local I = m.P(function (s,i) print(i, s:sub(1, i-1)); return i end) + + +local function getdef (id, defs) + local c = defs and defs[id] + if not c then + error("undefined name: " .. id) + end + return c +end + + +local function mult (p, n) + local np = mm.P(true) + while n >= 1 do + if n%2 >= 1 then np = np * p end + p = p * p + n = n/2 + end + return np +end + +local function equalcap (s, i, c) + if type(c) ~= "string" then return nil end + local e = #c + i + if s:sub(i, e - 1) == c then return e else return nil end +end + + +local S = (Predef.space + "--" * (any - Predef.nl)^0)^0 + +local name = m.C(m.R("AZ", "az", "__") * m.R("AZ", "az", "__", "09")^0) + +local arrow = S * "<-" + +-- a defined name only have meaning in a given environment +local Def = name * m.Carg(1) + +local num = m.C(m.R"09"^1) * S / tonumber + +local String = "'" * m.C((any - "'" - m.P"\n")^0) * expect("'", "MisTerm1") + + '"' * m.C((any - '"' - m.P"\n")^0) * expect('"', "MisTerm2") + + +local defined = "%" * Def / function (c,Defs) + local cat = Defs and Defs[c] or Predef[c] + if not cat then + error("name '" .. c .. "' undefined") + end + return cat +end + +local Range = m.Cs(any * (m.P"-"/"") * (any - "]")) / mm.R + +local item = defined + Range + m.C(any - m.P"\n") + +local Class = + "[" + * (m.C(m.P"^"^-1)) -- optional complement symbol + * m.Cf(expect(item, "ExpItem") * (item - "]")^0, mt.__add) + / function (c, p) return c == "^" and any - p or p end + * expect("]", "MisClose8") + +local function adddef (t, k, exp) + if t[k] then + error("'"..k.."' already defined as a rule") + else + t[k] = exp + end + return t +end + +local function firstdef (n, r) return adddef({n}, n, r) end + + +local function NT (n, b) + if not b then + error("rule '"..n.."' used outside a grammar") + else return mm.V(n) + end +end + +local function choicerec (...) + local t = { ... } + local n = #t + local p = t[1] + local i = 2 + while i + 1 <= n do + -- t[i] == nil when there are no labels + p = t[i] and mm.Rec(p, t[i+1], unpack(t[i])) or mt.__add(p, t[i+1]) + i = i + 2 + end + + return p +end + +local exp = m.P{ "Exp", + Exp = S * ( m.V"Grammar" + + (m.V"Seq" * (S * (("//" * m.Ct(m.V"Labels")) + ("/" * m.Cc(nil))) + * expect(S * m.V"Seq", "ExpPatt1") + )^0 + ) / choicerec); + Labels = m.P"{" * expect(S * m.V"Label", "ExpLab1") + * (S * "," * expect(S * m.V"Label", "ExpLab2"))^0 + * expect(S * "}", "MisClose7"); + Seq = m.Cf(m.Cc(m.P"") * m.V"Prefix" * (S * m.V"Prefix")^0, mt.__mul); + Prefix = "&" * expect(S * m.V"Prefix", "ExpPatt2") / mt.__len + + "!" * expect(S * m.V"Prefix", "ExpPatt3") / mt.__unm + + m.V"Suffix"; + Suffix = m.Cf(m.V"Primary" * + ( S * ( m.P"+" * m.Cc(1, mt.__pow) + + m.P"*" * m.Cc(0, mt.__pow) + + m.P"?" * m.Cc(-1, mt.__pow) + + "^" * expect( m.Cg(num * m.Cc(mult)) + + m.Cg(m.C(m.S"+-" * m.R"09"^1) * m.Cc(mt.__pow) + ), + "ExpNum") + + "->" * expect(S * ( m.Cg((String + num) * m.Cc(mt.__div)) + + m.P"{}" * m.Cc(nil, m.Ct) + + m.Cg(Def / getdef * m.Cc(mt.__div)) + ), + "ExpCap") + + "=>" * expect(S * m.Cg(Def / getdef * m.Cc(m.Cmt)), + "ExpName1") + ) + )^0, function (a,b,f) return f(a,b) end ); + Primary = "(" * expect(m.V"Exp", "ExpPatt4") * expect(S * ")", "MisClose1") + + String / mm.P + + Class + + defined + + "%" * expect(m.P"{", "ExpNameOrLab") + * expect(S * m.V"Label", "ExpLab1") + * expect(S * "}", "MisClose7") / mm.T + + "{:" * (name * ":" + m.Cc(nil)) * expect(m.V"Exp", "ExpPatt5") + * expect(S * ":}", "MisClose2") + / function (n, p) return mm.Cg(p, n) end + + "=" * expect(name, "ExpName2") + / function (n) return mm.Cmt(mm.Cb(n), equalcap) end + + m.P"{}" / mm.Cp + + "{~" * expect(m.V"Exp", "ExpPatt6") + * expect(S * "~}", "MisClose3") / mm.Cs + + "{|" * expect(m.V"Exp", "ExpPatt7") + * expect(S * "|}", "MisClose4") / mm.Ct + + "{" * expect(m.V"Exp", "ExpPattOrClose") + * expect(S * "}", "MisClose5") / mm.C + + m.P"." * m.Cc(any) + + (name * -arrow + "<" * expect(name, "ExpName3") + * expect(">", "MisClose6")) * m.Cb("G") / NT; + Label = num + name / function (f) return tlabels[f] end; + Definition = name * arrow * expect(m.V"Exp", "ExpPatt8"); + Grammar = m.Cg(m.Cc(true), "G") + * m.Cf(m.V"Definition" / firstdef * (S * m.Cg(m.V"Definition"))^0, + adddef) / mm.P; +} + +local pattern = S * m.Cg(m.Cc(false), "G") * expect(exp, "NoPatt") / mm.P + * S * expect(-any, "ExtraChars") + +local function lineno (s, i) + if i == 1 then return 1, 1 end + local adjustment = 0 + -- report the current line if at end of line, not the next + if s:sub(i,i) == '\n' then + i = i-1 + adjustment = 1 + end + local rest, num = s:sub(1,i):gsub("[^\n]*\n", "") + local r = #rest + return 1 + num, (r ~= 0 and r or 1) + adjustment +end + +local function calcline (s, i) + if i == 1 then return 1, 1 end + local rest, line = s:sub(1,i):gsub("[^\n]*\n", "") + local col = #rest + return 1 + line, col ~= 0 and col or 1 +end + + +local function splitlines(str) + local t = {} + local function helper(line) tinsert(t, line) return "" end + helper((str:gsub("(.-)\r?\n", helper))) + return t +end + +local function compile (p, defs) + if mm.type(p) == "pattern" then return p end -- already compiled + p = p .. " " -- for better reporting of column numbers in errors when at EOF + local ok, cp, label, suffix = pcall(function() return pattern:match(p, 1, defs) end) + if not ok and cp then + if type(cp) == "string" then + cp = cp:gsub("^[^:]+:[^:]+: ", "") + end + error(cp, 3) + end + if not cp then + local lines = splitlines(p) + local line, col = lineno(p, #p - #suffix + 1) + --local line, col = calcline(p, #p - #suffix + 1) + local err = {} + tinsert(err, "L" .. line .. ":C" .. col .. ": " .. errmsgs[label]) + tinsert(err, lines[line]) + tinsert(err, rep(" ", col-1) .. "^") + error("syntax error(s) in pattern\n" .. concat(err, "\n"), 3) + end + return cp +end + +local function match (s, p, i) + local cp = mem[p] + if not cp then + cp = compile(p) + mem[p] = cp + end + return cp:match(s, i or 1) +end + +local function find (s, p, i) + local cp = fmem[p] + if not cp then + cp = compile(p) / 0 + cp = mm.P{ mm.Cp() * cp * mm.Cp() + 1 * mm.V(1) } + fmem[p] = cp + end + local i, e = cp:match(s, i or 1) + if i then return i, e - 1 + else return i + end +end + +local function gsub (s, p, rep) + local g = gmem[p] or {} -- ensure gmem[p] is not collected while here + gmem[p] = g + local cp = g[rep] + if not cp then + cp = compile(p) + cp = mm.Cs((cp / rep + 1)^0) + g[rep] = cp + end + return cp:match(s) +end + +local function setlabels (t) + tlabels = t +end + + +-- exported names +local re = { + compile = compile, + match = match, + find = find, + gsub = gsub, + updatelocale = updatelocale, + setlabels = setlabels, + calcline = calcline +} + +if version == "Lua 5.1" then _G.re = re end + +return re diff --git a/06/lpeglabel/rockspecs/lpeglabel-0.12.2-1.rockspec b/06/lpeglabel/rockspecs/lpeglabel-0.12.2-1.rockspec new file mode 100644 index 0000000..63500ff --- /dev/null +++ b/06/lpeglabel/rockspecs/lpeglabel-0.12.2-1.rockspec @@ -0,0 +1,32 @@ +package = "LPegLabel" +version = "0.12.2-1" +source = { + url = "https://github.com/sqmedeiros/lpeglabel/archive/v0.12.2.tar.gz", + tag = "v0.12.2", + dir = "lpeglabel-0.12.2", +} +description = { + summary = "Parsing Expression Grammars For Lua with Labeled Failures", + detailed = [[ + LPegLabel is a conservative extension of the LPeg library that provides + an implementation of Parsing Expression Grammars (PEGs) with labeled failures. + Labels can be used to signal different kinds of erros and to specify which + alternative in a labeled ordered choice should handle a given label. + Labels can also be combined with the standard patterns of LPeg. + ]], + homepage = "https://github.com/sqmedeiros/lpeglabel/", + maintainer = "Sergio Medeiros ", + license = "MIT/X11" +} +dependencies = { + "lua >= 5.2", +} +build = { + type = "builtin", + modules = { + lpeglabel = { + "lpcap.c", "lpcode.c", "lpprint.c", "lptree.c", "lpvm.c" + }, + relabel = "relabel.lua" + } +} diff --git a/06/lpeglabel/rockspecs/lpeglabel-0.12.2-2.rockspec b/06/lpeglabel/rockspecs/lpeglabel-0.12.2-2.rockspec new file mode 100644 index 0000000..e370f7d --- /dev/null +++ b/06/lpeglabel/rockspecs/lpeglabel-0.12.2-2.rockspec @@ -0,0 +1,32 @@ +package = "LPegLabel" +version = "0.12.2-2" +source = { + url = "https://github.com/sqmedeiros/lpeglabel/archive/v0.12.2-2.tar.gz", + tag = "v0.12.2-2", + dir = "lpeglabel-0.12.2-2", +} +description = { + summary = "Parsing Expression Grammars For Lua with Labeled Failures", + detailed = [[ + LPegLabel is a conservative extension of the LPeg library that provides + an implementation of Parsing Expression Grammars (PEGs) with labeled failures. + Labels can be used to signal different kinds of erros and to specify which + alternative in a labeled ordered choice should handle a given label. + Labels can also be combined with the standard patterns of LPeg. + ]], + homepage = "https://github.com/sqmedeiros/lpeglabel/", + maintainer = "Sergio Medeiros ", + license = "MIT/X11" +} +dependencies = { + "lua >= 5.1", +} +build = { + type = "builtin", + modules = { + lpeglabel = { + "lpcap.c", "lpcode.c", "lpprint.c", "lptree.c", "lpvm.c" + }, + relabel = "relabel.lua" + } +} diff --git a/06/lpeglabel/rockspecs/lpeglabel-1.0.0-1.rockspec b/06/lpeglabel/rockspecs/lpeglabel-1.0.0-1.rockspec new file mode 100644 index 0000000..d19b833 --- /dev/null +++ b/06/lpeglabel/rockspecs/lpeglabel-1.0.0-1.rockspec @@ -0,0 +1,32 @@ +package = "LPegLabel" +version = "1.0.0-1" +source = { + url = "https://github.com/sqmedeiros/lpeglabel/archive/v1.0.0-1.tar.gz", + tag = "v1.0.0-1", + dir = "lpeglabel-1.0.0-1", +} +description = { + summary = "Parsing Expression Grammars For Lua with Labeled Failures", + detailed = [[ + LPegLabel is a conservative extension of the LPeg library that provides + an implementation of Parsing Expression Grammars (PEGs) with labeled failures. + Labels can be used to signal different kinds of erros and to specify which + alternative in a labeled ordered choice should handle a given label. + Labels can also be combined with the standard patterns of LPeg. + ]], + homepage = "https://github.com/sqmedeiros/lpeglabel/", + maintainer = "Sergio Medeiros ", + license = "MIT/X11" +} +dependencies = { + "lua >= 5.1", +} +build = { + type = "builtin", + modules = { + lpeglabel = { + "lpcap.c", "lpcode.c", "lpprint.c", "lptree.c", "lpvm.c" + }, + relabel = "relabel.lua" + } +} diff --git a/06/lpeglabel/rockspecs/lpeglabel-1.1.0-1.rockspec b/06/lpeglabel/rockspecs/lpeglabel-1.1.0-1.rockspec new file mode 100644 index 0000000..d7bbc95 --- /dev/null +++ b/06/lpeglabel/rockspecs/lpeglabel-1.1.0-1.rockspec @@ -0,0 +1,32 @@ +package = "LPegLabel" +version = "1.1.0-1" +source = { + url = "https://github.com/sqmedeiros/lpeglabel/archive/v1.1.0-1.tar.gz", + tag = "v1.1.0-1", + dir = "lpeglabel-1.1.0-1", +} +description = { + summary = "Parsing Expression Grammars For Lua with Labeled Failures", + detailed = [[ + LPegLabel is a conservative extension of the LPeg library that provides + an implementation of Parsing Expression Grammars (PEGs) with labeled failures. + Labels can be used to signal different kinds of erros and to specify which + which recovery pattern should handle a given label. + Labels can also be combined with the standard patterns of LPeg. + ]], + homepage = "https://github.com/sqmedeiros/lpeglabel/", + maintainer = "Sergio Medeiros ", + license = "MIT/X11" +} +dependencies = { + "lua >= 5.1", +} +build = { + type = "builtin", + modules = { + lpeglabel = { + "lpcap.c", "lpcode.c", "lpprint.c", "lptree.c", "lpvm.c" + }, + relabel = "relabel.lua" + } +} diff --git a/06/lpeglabel/rockspecs/lpeglabel-1.2.0-1.rockspec b/06/lpeglabel/rockspecs/lpeglabel-1.2.0-1.rockspec new file mode 100644 index 0000000..2fd17b9 --- /dev/null +++ b/06/lpeglabel/rockspecs/lpeglabel-1.2.0-1.rockspec @@ -0,0 +1,32 @@ +package = "LPegLabel" +version = "1.2.0-1" +source = { + url = "https://github.com/sqmedeiros/lpeglabel/archive/v1.2.0-1.tar.gz", + tag = "v1.2.0-1", + dir = "lpeglabel-1.2.0-1", +} +description = { + summary = "Parsing Expression Grammars For Lua with Labeled Failures", + detailed = [[ + LPegLabel is a conservative extension of the LPeg library that provides + an implementation of Parsing Expression Grammars (PEGs) with labeled failures. + Labels can be used to signal different kinds of erros and to specify which recovery + pattern should handle a given label. + LPegLabel also reports the farthest failure position in case of an ordinary failure. + ]], + homepage = "https://github.com/sqmedeiros/lpeglabel/", + maintainer = "Sergio Medeiros ", + license = "MIT/X11" +} +dependencies = { + "lua >= 5.1", +} +build = { + type = "builtin", + modules = { + lpeglabel = { + "lpcap.c", "lpcode.c", "lpprint.c", "lptree.c", "lpvm.c" + }, + relabel = "relabel.lua" + } +} diff --git a/06/lpeglabel/test.lua b/06/lpeglabel/test.lua new file mode 100755 index 0000000..d5922ac --- /dev/null +++ b/06/lpeglabel/test.lua @@ -0,0 +1,1449 @@ +#!/usr/bin/env lua + +-- $Id: test.lua,v 1.109 2015/09/28 17:01:25 roberto Exp $ + +-- require"strict" -- just to be pedantic + +local m = require"lpeglabel" + + +-- for general use +local a, b, c, d, e, f, g, p, t + + +-- compatibility with Lua 5.2 +local unpack = rawget(table, "unpack") or unpack +local loadstring = rawget(_G, "loadstring") or load + + +local any = m.P(1) +local space = m.S" \t\n"^0 + +local function checkeq (x, y, p) +if p then print(x,y) end + if type(x) ~= "table" then assert(x == y) + else + for k,v in pairs(x) do checkeq(v, y[k], p) end + for k,v in pairs(y) do checkeq(v, x[k], p) end + end +end + + +local mt = getmetatable(m.P(1)) + + +local allchar = {} +for i=0,255 do allchar[i + 1] = i end +allchar = string.char(unpack(allchar)) +assert(#allchar == 256) + +local function cs2str (c) + return m.match(m.Cs((c + m.P(1)/"")^0), allchar) +end + +local function eqcharset (c1, c2) + assert(cs2str(c1) == cs2str(c2)) +end + + +print"General tests for LPeg library" + +assert(type(m.version()) == "string") +print("version " .. m.version()) +assert(m.type("alo") ~= "pattern") +assert(m.type(io.input) ~= "pattern") +assert(m.type(m.P"alo") == "pattern") + +-- tests for some basic optimizations +assert(m.match(m.P(false) + "a", "a") == 2) +assert(m.match(m.P(true) + "a", "a") == 1) +assert(m.match("a" + m.P(false), "b") == nil) +assert(m.match("a" + m.P(true), "b") == 1) + +assert(m.match(m.P(false) * "a", "a") == nil) +assert(m.match(m.P(true) * "a", "a") == 2) +assert(m.match("a" * m.P(false), "a") == nil) +assert(m.match("a" * m.P(true), "a") == 2) + +assert(m.match(#m.P(false) * "a", "a") == nil) +assert(m.match(#m.P(true) * "a", "a") == 2) +assert(m.match("a" * #m.P(false), "a") == nil) +assert(m.match("a" * #m.P(true), "a") == 2) + + +-- tests for locale +do + assert(m.locale(m) == m) + local t = {} + assert(m.locale(t, m) == t) + local x = m.locale() + for n,v in pairs(x) do + assert(type(n) == "string") + eqcharset(v, m[n]) + end +end + + +assert(m.match(3, "aaaa")) +assert(m.match(4, "aaaa")) +assert(not m.match(5, "aaaa")) +assert(m.match(-3, "aa")) +assert(not m.match(-3, "aaa")) +assert(not m.match(-3, "aaaa")) +assert(not m.match(-4, "aaaa")) +assert(m.P(-5):match"aaaa") + +assert(m.match("a", "alo") == 2) +assert(m.match("al", "alo") == 3) +assert(not m.match("alu", "alo")) +assert(m.match(true, "") == 1) + +local digit = m.S"0123456789" +local upper = m.S"ABCDEFGHIJKLMNOPQRSTUVWXYZ" +local lower = m.S"abcdefghijklmnopqrstuvwxyz" +local letter = m.S"" + upper + lower +local alpha = letter + digit + m.R() + +eqcharset(m.S"", m.P(false)) +eqcharset(upper, m.R("AZ")) +eqcharset(lower, m.R("az")) +eqcharset(upper + lower, m.R("AZ", "az")) +eqcharset(upper + lower, m.R("AZ", "cz", "aa", "bb", "90")) +eqcharset(digit, m.S"01234567" + "8" + "9") +eqcharset(upper, letter - lower) +eqcharset(m.S(""), m.R()) +assert(cs2str(m.S("")) == "") + +eqcharset(m.S"\0", "\0") +eqcharset(m.S"\1\0\2", m.R"\0\2") +eqcharset(m.S"\1\0\2", m.R"\1\2" + "\0") +eqcharset(m.S"\1\0\2" - "\0", m.R"\1\2") + +local word = alpha^1 * (1 - alpha)^0 + +assert((word^0 * -1):match"alo alo") +assert(m.match(word^1 * -1, "alo alo")) +assert(m.match(word^2 * -1, "alo alo")) +assert(not m.match(word^3 * -1, "alo alo")) + +assert(not m.match(word^-1 * -1, "alo alo")) +assert(m.match(word^-2 * -1, "alo alo")) +assert(m.match(word^-3 * -1, "alo alo")) + +local eos = m.P(-1) + +assert(m.match(digit^0 * letter * digit * eos, "1298a1")) +assert(not m.match(digit^0 * letter * eos, "1257a1")) + +b = { + [1] = "(" * (((1 - m.S"()") + #m.P"(" * m.V(1))^0) * ")" +} + +assert(m.match(b, "(al())()")) +assert(not m.match(b * eos, "(al())()")) +assert(m.match(b * eos, "((al())()(é))")) +assert(not m.match(b, "(al()()")) + +assert(not m.match(letter^1 - "for", "foreach")) +assert(m.match(letter^1 - ("for" * eos), "foreach")) +assert(not m.match(letter^1 - ("for" * eos), "for")) + +function basiclookfor (p) + return m.P { + [1] = p + (1 * m.V(1)) + } +end + +function caplookfor (p) + return basiclookfor(p:C()) +end + +assert(m.match(caplookfor(letter^1), " 4achou123...") == "achou") +a = {m.match(caplookfor(letter^1)^0, " two words, one more ")} +checkeq(a, {"two", "words", "one", "more"}) + +assert(m.match( basiclookfor((#m.P(b) * 1) * m.Cp()), " ( (a)") == 7) + +a = {m.match(m.C(digit^1 * m.Cc"d") + m.C(letter^1 * m.Cc"l"), "123")} +checkeq(a, {"123", "d"}) + +-- bug in LPeg 0.12 (nil value does not create a 'ktable') +assert(m.match(m.Cc(nil), "") == nil) + +a = {m.match(m.C(digit^1 * m.Cc"d") + m.C(letter^1 * m.Cc"l"), "abcd")} +checkeq(a, {"abcd", "l"}) + +a = {m.match(m.Cc(10,20,30) * 'a' * m.Cp(), 'aaa')} +checkeq(a, {10,20,30,2}) +a = {m.match(m.Cp() * m.Cc(10,20,30) * 'a' * m.Cp(), 'aaa')} +checkeq(a, {1,10,20,30,2}) +a = m.match(m.Ct(m.Cp() * m.Cc(10,20,30) * 'a' * m.Cp()), 'aaa') +checkeq(a, {1,10,20,30,2}) +a = m.match(m.Ct(m.Cp() * m.Cc(7,8) * m.Cc(10,20,30) * 'a' * m.Cp()), 'aaa') +checkeq(a, {1,7,8,10,20,30,2}) +a = {m.match(m.Cc() * m.Cc() * m.Cc(1) * m.Cc(2,3,4) * m.Cc() * 'a', 'aaa')} +checkeq(a, {1,2,3,4}) + +a = {m.match(m.Cp() * letter^1 * m.Cp(), "abcd")} +checkeq(a, {1, 5}) + + +t = {m.match({[1] = m.C(m.C(1) * m.V(1) + -1)}, "abc")} +checkeq(t, {"abc", "a", "bc", "b", "c", "c", ""}) + +-- bug in 0.12 ('hascapture' did not check for captures inside a rule) +do + local pat = m.P{ + 'S'; + S1 = m.C('abc') + 3, + S = #m.V('S1') -- rule has capture, but '#' must ignore it + } + assert(pat:match'abc' == 1) +end + + +-- test for small capture boundary +for i = 250,260 do + assert(#m.match(m.C(i), string.rep('a', i)) == i) + assert(#m.match(m.C(m.C(i)), string.rep('a', i)) == i) +end + +-- tests for any*n and any*-n +for n = 1, 550, 13 do + local x_1 = string.rep('x', n - 1) + local x = x_1 .. 'a' + assert(not m.P(n):match(x_1)) + assert(m.P(n):match(x) == n + 1) + assert(n < 4 or m.match(m.P(n) + "xxx", x_1) == 4) + assert(m.C(n):match(x) == x) + assert(m.C(m.C(n)):match(x) == x) + assert(m.P(-n):match(x_1) == 1) + assert(not m.P(-n):match(x)) + assert(n < 13 or m.match(m.Cc(20) * ((n - 13) * m.P(10)) * 3, x) == 20) + local n3 = math.floor(n/3) + assert(m.match(n3 * m.Cp() * n3 * n3, x) == n3 + 1) +end + +-- true values +assert(m.P(0):match("x") == 1) +assert(m.P(0):match("") == 1) +assert(m.C(0):match("x") == "") + +assert(m.match(m.Cc(0) * m.P(10) + m.Cc(1) * "xuxu", "xuxu") == 1) +assert(m.match(m.Cc(0) * m.P(10) + m.Cc(1) * "xuxu", "xuxuxuxuxu") == 0) +assert(m.match(m.C(m.P(2)^1), "abcde") == "abcd") +p = m.Cc(0) * 1 + m.Cc(1) * 2 + m.Cc(2) * 3 + m.Cc(3) * 4 + + +-- test for alternation optimization +assert(m.match(m.P"a"^1 + "ab" + m.P"x"^0, "ab") == 2) +assert(m.match((m.P"a"^1 + "ab" + m.P"x"^0 * 1)^0, "ab") == 3) +assert(m.match(m.P"ab" + "cd" + "" + "cy" + "ak", "98") == 1) +assert(m.match(m.P"ab" + "cd" + "ax" + "cy", "ax") == 3) +assert(m.match("a" * m.P"b"^0 * "c" + "cd" + "ax" + "cy", "ax") == 3) +assert(m.match((m.P"ab" + "cd" + "ax" + "cy")^0, "ax") == 3) +assert(m.match(m.P(1) * "x" + m.S"" * "xu" + "ay", "ay") == 3) +assert(m.match(m.P"abc" + "cde" + "aka", "aka") == 4) +assert(m.match(m.S"abc" * "x" + "cde" + "aka", "ax") == 3) +assert(m.match(m.S"abc" * "x" + "cde" + "aka", "aka") == 4) +assert(m.match(m.S"abc" * "x" + "cde" + "aka", "cde") == 4) +assert(m.match(m.S"abc" * "x" + "ide" + m.S"ab" * "ka", "aka") == 4) +assert(m.match("ab" + m.S"abc" * m.P"y"^0 * "x" + "cde" + "aka", "ax") == 3) +assert(m.match("ab" + m.S"abc" * m.P"y"^0 * "x" + "cde" + "aka", "aka") == 4) +assert(m.match("ab" + m.S"abc" * m.P"y"^0 * "x" + "cde" + "aka", "cde") == 4) +assert(m.match("ab" + m.S"abc" * m.P"y"^0 * "x" + "ide" + m.S"ab" * "ka", "aka") == 4) +assert(m.match("ab" + m.S"abc" * m.P"y"^0 * "x" + "ide" + m.S"ab" * "ka", "ax") == 3) +assert(m.match(m.P(1) * "x" + "cde" + m.S"ab" * "ka", "aka") == 4) +assert(m.match(m.P(1) * "x" + "cde" + m.P(1) * "ka", "aka") == 4) +assert(m.match(m.P(1) * "x" + "cde" + m.P(1) * "ka", "cde") == 4) +assert(m.match(m.P"eb" + "cd" + m.P"e"^0 + "x", "ee") == 3) +assert(m.match(m.P"ab" + "cd" + m.P"e"^0 + "x", "abcd") == 3) +assert(m.match(m.P"ab" + "cd" + m.P"e"^0 + "x", "eeex") == 4) +assert(m.match(m.P"ab" + "cd" + m.P"e"^0 + "x", "cd") == 3) +assert(m.match(m.P"ab" + "cd" + m.P"e"^0 + "x", "x") == 1) +assert(m.match(m.P"ab" + "cd" + m.P"e"^0 + "x" + "", "zee") == 1) +assert(m.match(m.P"ab" + "cd" + m.P"e"^1 + "x", "abcd") == 3) +assert(m.match(m.P"ab" + "cd" + m.P"e"^1 + "x", "eeex") == 4) +assert(m.match(m.P"ab" + "cd" + m.P"e"^1 + "x", "cd") == 3) +assert(m.match(m.P"ab" + "cd" + m.P"e"^1 + "x", "x") == 2) +assert(m.match(m.P"ab" + "cd" + m.P"e"^1 + "x" + "", "zee") == 1) +assert(not m.match(("aa" * m.P"bc"^-1 + "aab") * "e", "aabe")) + +assert(m.match("alo" * (m.P"\n" + -1), "alo") == 4) + + +-- bug in 0.12 (rc1) +assert(m.match((m.P"\128\187\191" + m.S"abc")^0, "\128\187\191") == 4) + +assert(m.match(m.S"\0\128\255\127"^0, string.rep("\0\128\255\127", 10)) == + 4*10 + 1) + +-- optimizations with optional parts +assert(m.match(("ab" * -m.P"c")^-1, "abc") == 1) +assert(m.match(("ab" * #m.P"c")^-1, "abd") == 1) +assert(m.match(("ab" * m.B"c")^-1, "ab") == 1) +assert(m.match(("ab" * m.P"cd"^0)^-1, "abcdcdc") == 7) + +assert(m.match(m.P"ab"^-1 - "c", "abcd") == 3) + +p = ('Aa' * ('Bb' * ('Cc' * m.P'Dd'^0)^0)^0)^-1 +assert(p:match("AaBbCcDdBbCcDdDdDdBb") == 21) + + +-- bug in 0.12.2 +-- p = { ('ab' ('c' 'ef'?)*)? } +p = m.C(('ab' * ('c' * m.P'ef'^-1)^0)^-1) +s = "abcefccefc" +assert(s == p:match(s)) + + +pi = "3.14159 26535 89793 23846 26433 83279 50288 41971 69399 37510" +assert(m.match(m.Cs((m.P"1" / "a" + m.P"5" / "b" + m.P"9" / "c" + 1)^0), pi) == + m.match(m.Cs((m.P(1) / {["1"] = "a", ["5"] = "b", ["9"] = "c"})^0), pi)) +print"+" + + +-- tests for capture optimizations +assert(m.match((m.P(3) + 4 * m.Cp()) * "a", "abca") == 5) +t = {m.match(((m.P"a" + m.Cp()) * m.P"x")^0, "axxaxx")} +checkeq(t, {3, 6}) + + +-- tests for numbered captures +p = m.C(1) +assert(m.match(m.C(m.C(p * m.C(2)) * m.C(3)) / 3, "abcdefgh") == "a") +assert(m.match(m.C(m.C(p * m.C(2)) * m.C(3)) / 1, "abcdefgh") == "abcdef") +assert(m.match(m.C(m.C(p * m.C(2)) * m.C(3)) / 4, "abcdefgh") == "bc") +assert(m.match(m.C(m.C(p * m.C(2)) * m.C(3)) / 0, "abcdefgh") == 7) + +a, b, c = m.match(p * (m.C(p * m.C(2)) * m.C(3) / 4) * p, "abcdefgh") +assert(a == "a" and b == "efg" and c == "h") + +-- test for table captures +t = m.match(m.Ct(letter^1), "alo") +checkeq(t, {}) + +t, n = m.match(m.Ct(m.C(letter)^1) * m.Cc"t", "alo") +assert(n == "t" and table.concat(t) == "alo") + +t = m.match(m.Ct(m.C(m.C(letter)^1)), "alo") +assert(table.concat(t, ";") == "alo;a;l;o") + +t = m.match(m.Ct(m.C(m.C(letter)^1)), "alo") +assert(table.concat(t, ";") == "alo;a;l;o") + +t = m.match(m.Ct(m.Ct((m.Cp() * letter * m.Cp())^1)), "alo") +assert(table.concat(t[1], ";") == "1;2;2;3;3;4") + +t = m.match(m.Ct(m.C(m.C(1) * 1 * m.C(1))), "alo") +checkeq(t, {"alo", "a", "o"}) + + +-- tests for groups +p = m.Cg(1) -- no capture +assert(p:match('x') == 'x') +p = m.Cg(m.P(true)/function () end * 1) -- no value +assert(p:match('x') == 'x') +p = m.Cg(m.Cg(m.Cg(m.C(1)))) +assert(p:match('x') == 'x') +p = m.Cg(m.Cg(m.Cg(m.C(1))^0) * m.Cg(m.Cc(1) * m.Cc(2))) +t = {p:match'abc'} +checkeq(t, {'a', 'b', 'c', 1, 2}) + +p = m.Ct(m.Cg(m.Cc(10), "hi") * m.C(1)^0 * m.Cg(m.Cc(20), "ho")) +t = p:match'' +checkeq(t, {hi = 10, ho = 20}) +t = p:match'abc' +checkeq(t, {hi = 10, ho = 20, 'a', 'b', 'c'}) + +-- non-string group names +p = m.Ct(m.Cg(1, print) * m.Cg(1, 23.5) * m.Cg(1, io)) +t = p:match('abcdefghij') +assert(t[print] == 'a' and t[23.5] == 'b' and t[io] == 'c') + + +-- test for error messages +local function checkerr (msg, f, ...) + local st, err = pcall(f, ...) + assert(not st and m.match({ m.P(msg) + 1 * m.V(1) }, err)) +end + +checkerr("rule '1' may be left recursive", m.match, { m.V(1) * 'a' }, "a") +checkerr("rule '1' used outside a grammar", m.match, m.V(1), "") +checkerr("rule 'hiii' used outside a grammar", m.match, m.V('hiii'), "") +checkerr("rule 'hiii' undefined in given grammar", m.match, { m.V('hiii') }, "") +checkerr("undefined in given grammar", m.match, { m.V{} }, "") + +checkerr("rule 'A' is not a pattern", m.P, { m.P(1), A = {} }) +checkerr("grammar has no initial rule", m.P, { [print] = {} }) + +-- grammar with a long call chain before left recursion +p = {'a', + a = m.V'b' * m.V'c' * m.V'd' * m.V'a', + b = m.V'c', + c = m.V'd', + d = m.V'e', + e = m.V'f', + f = m.V'g', + g = m.P'' +} +checkerr("rule 'a' may be left recursive", m.match, p, "a") + +-- Bug in peephole optimization of LPeg 0.12 (IJmp -> ICommit) +-- the next grammar has an original sequence IJmp -> ICommit -> IJmp L1 +-- that is optimized to ICommit L1 + +p = m.P { (m.P {m.P'abc'} + 'ayz') * m.V'y'; y = m.P'x' } +assert(p:match('abcx') == 5 and p:match('ayzx') == 5 and not p:match'abc') + + +do + -- large dynamic Cc + local lim = 2^16 - 1 + local c = 0 + local function seq (n) + if n == 1 then c = c + 1; return m.Cc(c) + else + local m = math.floor(n / 2) + return seq(m) * seq(n - m) + end + end + p = m.Ct(seq(lim)) + t = p:match('') + assert(t[lim] == lim) + checkerr("too many", function () p = p / print end) + checkerr("too many", seq, lim + 1) +end + + +-- tests for non-pattern as arguments to pattern functions + +p = { ('a' * m.V(1))^-1 } * m.P'b' * { 'a' * m.V(2); m.V(1)^-1 } +assert(m.match(p, "aaabaac") == 7) + +p = m.P'abc' * 2 * -5 * true * 'de' -- mix of numbers and strings and booleans + +assert(p:match("abc01de") == 8) +assert(p:match("abc01de3456") == nil) + +p = 'abc' * (2 * (-5 * (true * m.P'de'))) + +assert(p:match("abc01de") == 8) +assert(p:match("abc01de3456") == nil) + +p = { m.V(2), m.P"abc" } * + (m.P{ "xx", xx = m.P"xx" } + { "x", x = m.P"a" * m.V"x" + "" }) +assert(p:match("abcaaaxx") == 7) +assert(p:match("abcxx") == 6) + + +-- a large table capture +t = m.match(m.Ct(m.C('a')^0), string.rep("a", 10000)) +assert(#t == 10000 and t[1] == 'a' and t[#t] == 'a') + +print('+') + + +-- bug in 0.10 (rechecking a grammar, after tail-call optimization) +m.P{ m.P { (m.P(3) + "xuxu")^0 * m.V"xuxu", xuxu = m.P(1) } } + +local V = m.V + +local Space = m.S(" \n\t")^0 +local Number = m.C(m.R("09")^1) * Space +local FactorOp = m.C(m.S("+-")) * Space +local TermOp = m.C(m.S("*/")) * Space +local Open = "(" * Space +local Close = ")" * Space + + +local function f_factor (v1, op, v2, d) + assert(d == nil) + if op == "+" then return v1 + v2 + else return v1 - v2 + end +end + + +local function f_term (v1, op, v2, d) + assert(d == nil) + if op == "*" then return v1 * v2 + else return v1 / v2 + end +end + +G = m.P{ "Exp", + Exp = m.Cf(V"Factor" * m.Cg(FactorOp * V"Factor")^0, f_factor); + Factor = m.Cf(V"Term" * m.Cg(TermOp * V"Term")^0, f_term); + Term = Number / tonumber + Open * V"Exp" * Close; +} + +G = Space * G * -1 + +for _, s in ipairs{" 3 + 5*9 / (1+1) ", "3+4/2", "3+3-3- 9*2+3*9/1- 8"} do + assert(m.match(G, s) == loadstring("return "..s)()) +end + + +-- test for grammars (errors deep in calling non-terminals) +g = m.P{ + [1] = m.V(2) + "a", + [2] = "a" * m.V(3) * "x", + [3] = "b" * m.V(3) + "c" +} + +assert(m.match(g, "abbbcx") == 7) +assert(m.match(g, "abbbbx") == 2) + + +-- tests for \0 +assert(m.match(m.R("\0\1")^1, "\0\1\0") == 4) +assert(m.match(m.S("\0\1ab")^1, "\0\1\0a") == 5) +assert(m.match(m.P(1)^3, "\0\1\0a") == 5) +assert(not m.match(-4, "\0\1\0a")) +assert(m.match("\0\1\0a", "\0\1\0a") == 5) +assert(m.match("\0\0\0", "\0\0\0") == 4) +assert(not m.match("\0\0\0", "\0\0")) + + +-- tests for predicates +assert(not m.match(-m.P("a") * 2, "alo")) +assert(m.match(- -m.P("a") * 2, "alo") == 3) +assert(m.match(#m.P("a") * 2, "alo") == 3) +assert(m.match(##m.P("a") * 2, "alo") == 3) +assert(not m.match(##m.P("c") * 2, "alo")) +assert(m.match(m.Cs((##m.P("a") * 1 + m.P(1)/".")^0), "aloal") == "a..a.") +assert(m.match(m.Cs((#((#m.P"a")/"") * 1 + m.P(1)/".")^0), "aloal") == "a..a.") +assert(m.match(m.Cs((- -m.P("a") * 1 + m.P(1)/".")^0), "aloal") == "a..a.") +assert(m.match(m.Cs((-((-m.P"a")/"") * 1 + m.P(1)/".")^0), "aloal") == "a..a.") + +p = -m.P'a' * m.Cc(1) + -m.P'b' * m.Cc(2) + -m.P'c' * m.Cc(3) +assert(p:match('a') == 2 and p:match('') == 1 and p:match('b') == 1) + +p = -m.P'a' * m.Cc(10) + #m.P'a' * m.Cc(20) +assert(p:match('a') == 20 and p:match('') == 10 and p:match('b') == 10) + + + +-- look-behind predicate +assert(not m.match(m.B'a', 'a')) +assert(m.match(1 * m.B'a', 'a') == 2) +assert(not m.match(m.B(1), 'a')) +assert(m.match(1 * m.B(1), 'a') == 2) +assert(m.match(-m.B(1), 'a') == 1) +assert(m.match(m.B(250), string.rep('a', 250)) == nil) +assert(m.match(250 * m.B(250), string.rep('a', 250)) == 251) + +-- look-behind with an open call +checkerr("pattern may not have fixed length", m.B, m.V'S1') +checkerr("too long to look behind", m.B, 260) + +B = #letter * -m.B(letter) + -letter * m.B(letter) +x = m.Ct({ (B * m.Cp())^-1 * (1 * m.V(1) + m.P(true)) }) +checkeq(m.match(x, 'ar cal c'), {1,3,4,7,9,10}) +checkeq(m.match(x, ' ar cal '), {2,4,5,8}) +checkeq(m.match(x, ' '), {}) +checkeq(m.match(x, 'aloalo'), {1,7}) + +assert(m.match(B, "a") == 1) +assert(m.match(1 * B, "a") == 2) +assert(not m.B(1 - letter):match("")) +assert((-m.B(letter)):match("") == 1) + +assert((4 * m.B(letter, 4)):match("aaaaaaaa") == 5) +assert(not (4 * m.B(#letter * 5)):match("aaaaaaaa")) +assert((4 * -m.B(#letter * 5)):match("aaaaaaaa") == 5) + +-- look-behind with grammars +assert(m.match('a' * m.B{'x', x = m.P(3)}, 'aaa') == nil) +assert(m.match('aa' * m.B{'x', x = m.P('aaa')}, 'aaaa') == nil) +assert(m.match('aaa' * m.B{'x', x = m.P('aaa')}, 'aaaaa') == 4) + + + +-- bug in 0.9 +assert(m.match(('a' * #m.P'b'), "ab") == 2) +assert(not m.match(('a' * #m.P'b'), "a")) + +assert(not m.match(#m.S'567', "")) +assert(m.match(#m.S'567' * 1, "6") == 2) + + +-- tests for Tail Calls + +p = m.P{ 'a' * m.V(1) + '' } +assert(p:match(string.rep('a', 1000)) == 1001) + +-- create a grammar for a simple DFA for even number of 0s and 1s +-- +-- ->1 <---0---> 2 +-- ^ ^ +-- | | +-- 1 1 +-- | | +-- V V +-- 3 <---0---> 4 +-- +-- this grammar should keep no backtracking information + +p = m.P{ + [1] = '0' * m.V(2) + '1' * m.V(3) + -1, + [2] = '0' * m.V(1) + '1' * m.V(4), + [3] = '0' * m.V(4) + '1' * m.V(1), + [4] = '0' * m.V(3) + '1' * m.V(2), +} + +assert(p:match(string.rep("00", 10000))) +assert(p:match(string.rep("01", 10000))) +assert(p:match(string.rep("011", 10000))) +assert(not p:match(string.rep("011", 10000) .. "1")) +assert(not p:match(string.rep("011", 10001))) + + +-- this grammar does need backtracking info. +local lim = 10000 +p = m.P{ '0' * m.V(1) + '0' } +checkerr("stack overflow", m.match, p, string.rep("0", lim)) +m.setmaxstack(2*lim) +checkerr("stack overflow", m.match, p, string.rep("0", lim)) +m.setmaxstack(2*lim + 4) +assert(m.match(p, string.rep("0", lim)) == lim + 1) + +-- this repetition should not need stack space (only the call does) +p = m.P{ ('a' * m.V(1))^0 * 'b' + 'c' } +m.setmaxstack(200) +assert(p:match(string.rep('a', 180) .. 'c' .. string.rep('b', 180)) == 362) + +m.setmaxstack(100) -- restore low limit + +-- tests for optional start position +assert(m.match("a", "abc", 1)) +assert(m.match("b", "abc", 2)) +assert(m.match("c", "abc", 3)) +assert(not m.match(1, "abc", 4)) +assert(m.match("a", "abc", -3)) +assert(m.match("b", "abc", -2)) +assert(m.match("c", "abc", -1)) +assert(m.match("abc", "abc", -4)) -- truncate to position 1 + +assert(m.match("", "abc", 10)) -- empty string is everywhere! +assert(m.match("", "", 10)) +assert(not m.match(1, "", 1)) +assert(not m.match(1, "", -1)) +assert(not m.match(1, "", 0)) + +print("+") + + +-- tests for argument captures +checkerr("invalid argument", m.Carg, 0) +checkerr("invalid argument", m.Carg, -1) +checkerr("invalid argument", m.Carg, 2^18) +checkerr("absent extra argument #1", m.match, m.Carg(1), 'a', 1) +assert(m.match(m.Carg(1), 'a', 1, print) == print) +x = {m.match(m.Carg(1) * m.Carg(2), '', 1, 10, 20)} +checkeq(x, {10, 20}) + +assert(m.match(m.Cmt(m.Cg(m.Carg(3), "a") * + m.Cmt(m.Cb("a"), function (s,i,x) + assert(s == "a" and i == 1); + return i, x+1 + end) * + m.Carg(2), function (s,i,a,b,c) + assert(s == "a" and i == 1 and c == nil); + return i, 2*a + 3*b + end) * "a", + "a", 1, false, 100, 1000) == 2*1001 + 3*100) + + +-- tests for Lua functions + +t = {} +s = "" +p = m.P(function (s1, i) assert(s == s1); t[#t + 1] = i; return nil end) * false +s = "hi, this is a test" +assert(m.match(((p - m.P(-1)) + 2)^0, s) == string.len(s) + 1) +assert(#t == string.len(s)/2 and t[1] == 1 and t[2] == 3) + +assert(not m.match(p, s)) + +p = mt.__add(function (s, i) return i end, function (s, i) return nil end) +assert(m.match(p, "alo")) + +p = mt.__mul(function (s, i) return i end, function (s, i) return nil end) +assert(not m.match(p, "alo")) + + +t = {} +p = function (s1, i) assert(s == s1); t[#t + 1] = i; return i end +s = "hi, this is a test" +assert(m.match((m.P(1) * p)^0, s) == string.len(s) + 1) +assert(#t == string.len(s) and t[1] == 2 and t[2] == 3) + +t = {} +p = m.P(function (s1, i) assert(s == s1); t[#t + 1] = i; + return i <= s1:len() and i end) * 1 +s = "hi, this is a test" +assert(m.match(p^0, s) == string.len(s) + 1) +assert(#t == string.len(s) + 1 and t[1] == 1 and t[2] == 2) + +p = function (s1, i) return m.match(m.P"a"^1, s1, i) end +assert(m.match(p, "aaaa") == 5) +assert(m.match(p, "abaa") == 2) +assert(not m.match(p, "baaa")) + +checkerr("invalid position", m.match, function () return 2^20 end, s) +checkerr("invalid position", m.match, function () return 0 end, s) +checkerr("invalid position", m.match, function (s, i) return i - 1 end, s) +checkerr("invalid position", m.match, + m.P(1)^0 * function (_, i) return i - 1 end, s) +assert(m.match(m.P(1)^0 * function (_, i) return i end * -1, s)) +checkerr("invalid position", m.match, + m.P(1)^0 * function (_, i) return i + 1 end, s) +assert(m.match(m.P(function (s, i) return s:len() + 1 end) * -1, s)) +checkerr("invalid position", m.match, m.P(function (s, i) return s:len() + 2 end) * -1, s) +assert(not m.match(m.P(function (s, i) return s:len() end) * -1, s)) +assert(m.match(m.P(1)^0 * function (_, i) return true end, s) == + string.len(s) + 1) +for i = 1, string.len(s) + 1 do + assert(m.match(function (_, _) return i end, s) == i) +end + +p = (m.P(function (s, i) return i%2 == 0 and i end) * 1 + + m.P(function (s, i) return i%2 ~= 0 and i + 2 <= s:len() and i end) * 3)^0 + * -1 +assert(p:match(string.rep('a', 14000))) + +-- tests for Function Replacements +f = function (a, ...) if a ~= "x" then return {a, ...} end end + +t = m.match(m.C(1)^0/f, "abc") +checkeq(t, {"a", "b", "c"}) + +t = m.match(m.C(1)^0/f/f, "abc") +checkeq(t, {{"a", "b", "c"}}) + +t = m.match(m.P(1)^0/f/f, "abc") -- no capture +checkeq(t, {{"abc"}}) + +t = m.match((m.P(1)^0/f * m.Cp())/f, "abc") +checkeq(t, {{"abc"}, 4}) + +t = m.match((m.C(1)^0/f * m.Cp())/f, "abc") +checkeq(t, {{"a", "b", "c"}, 4}) + +t = m.match((m.C(1)^0/f * m.Cp())/f, "xbc") +checkeq(t, {4}) + +t = m.match(m.C(m.C(1)^0)/f, "abc") +checkeq(t, {"abc", "a", "b", "c"}) + +g = function (...) return 1, ... end +t = {m.match(m.C(1)^0/g/g, "abc")} +checkeq(t, {1, 1, "a", "b", "c"}) + +t = {m.match(m.Cc(nil,nil,4) * m.Cc(nil,3) * m.Cc(nil, nil) / g / g, "")} +t1 = {1,1,nil,nil,4,nil,3,nil,nil} +for i=1,10 do assert(t[i] == t1[i]) end + +-- bug in 0.12.2: ktable with only nil could be eliminated when joining +-- with a pattern without ktable +assert((m.P"aaa" * m.Cc(nil)):match"aaa" == nil) + +t = {m.match((m.C(1) / function (x) return x, x.."x" end)^0, "abc")} +checkeq(t, {"a", "ax", "b", "bx", "c", "cx"}) + +t = m.match(m.Ct((m.C(1) / function (x,y) return y, x end * m.Cc(1))^0), "abc") +checkeq(t, {nil, "a", 1, nil, "b", 1, nil, "c", 1}) + +-- tests for Query Replacements + +assert(m.match(m.C(m.C(1)^0)/{abc = 10}, "abc") == 10) +assert(m.match(m.C(1)^0/{a = 10}, "abc") == 10) +assert(m.match(m.S("ba")^0/{ab = 40}, "abc") == 40) +t = m.match(m.Ct((m.S("ba")/{a = 40})^0), "abc") +checkeq(t, {40}) + +assert(m.match(m.Cs((m.C(1)/{a=".", d=".."})^0), "abcdde") == ".bc....e") +assert(m.match(m.Cs((m.C(1)/{f="."})^0), "abcdde") == "abcdde") +assert(m.match(m.Cs((m.C(1)/{d="."})^0), "abcdde") == "abc..e") +assert(m.match(m.Cs((m.C(1)/{e="."})^0), "abcdde") == "abcdd.") +assert(m.match(m.Cs((m.C(1)/{e=".", f="+"})^0), "eefef") == "..+.+") +assert(m.match(m.Cs((m.C(1))^0), "abcdde") == "abcdde") +assert(m.match(m.Cs(m.C(m.C(1)^0)), "abcdde") == "abcdde") +assert(m.match(1 * m.Cs(m.P(1)^0), "abcdde") == "bcdde") +assert(m.match(m.Cs((m.C('0')/'x' + 1)^0), "abcdde") == "abcdde") +assert(m.match(m.Cs((m.C('0')/'x' + 1)^0), "0ab0b0") == "xabxbx") +assert(m.match(m.Cs((m.C('0')/'x' + m.P(1)/{b=3})^0), "b0a0b") == "3xax3") +assert(m.match(m.P(1)/'%0%0'/{aa = -3} * 'x', 'ax') == -3) +assert(m.match(m.C(1)/'%0%1'/{aa = 'z'}/{z = -3} * 'x', 'ax') == -3) + +assert(m.match(m.Cs(m.Cc(0) * (m.P(1)/"")), "4321") == "0") + +assert(m.match(m.Cs((m.P(1) / "%0")^0), "abcd") == "abcd") +assert(m.match(m.Cs((m.P(1) / "%0.%0")^0), "abcd") == "a.ab.bc.cd.d") +assert(m.match(m.Cs((m.P("a") / "%0.%0" + 1)^0), "abcad") == "a.abca.ad") +assert(m.match(m.C("a") / "%1%%%0", "a") == "a%a") +assert(m.match(m.Cs((m.P(1) / ".xx")^0), "abcd") == ".xx.xx.xx.xx") +assert(m.match(m.Cp() * m.P(3) * m.Cp()/"%2%1%1 - %0 ", "abcde") == + "411 - abc ") + +assert(m.match(m.P(1)/"%0", "abc") == "a") +checkerr("invalid capture index", m.match, m.P(1)/"%1", "abc") +checkerr("invalid capture index", m.match, m.P(1)/"%9", "abc") + +p = m.C(1) +p = p * p; p = p * p; p = p * p * m.C(1) / "%9 - %1" +assert(p:match("1234567890") == "9 - 1") + +assert(m.match(m.Cc(print), "") == print) + +-- too many captures (just ignore extra ones) +p = m.C(1)^0 / "%2-%9-%0-%9" +assert(p:match"01234567890123456789" == "1-8-01234567890123456789-8") +s = string.rep("12345678901234567890", 20) +assert(m.match(m.C(1)^0 / "%9-%1-%0-%3", s) == "9-1-" .. s .. "-3") + +-- string captures with non-string subcaptures +p = m.Cc('alo') * m.C(1) / "%1 - %2 - %1" +assert(p:match'x' == 'alo - x - alo') + +checkerr("invalid capture value (a boolean)", m.match, m.Cc(true) / "%1", "a") + +-- long strings for string capture +l = 10000 +s = string.rep('a', l) .. string.rep('b', l) .. string.rep('c', l) + +p = (m.C(m.P'a'^1) * m.C(m.P'b'^1) * m.C(m.P'c'^1)) / '%3%2%1' + +assert(p:match(s) == string.rep('c', l) .. + string.rep('b', l) .. + string.rep('a', l)) + +print"+" + +-- accumulator capture +function f (x) return x + 1 end +assert(m.match(m.Cf(m.Cc(0) * m.C(1)^0, f), "alo alo") == 7) + +t = {m.match(m.Cf(m.Cc(1,2,3), error), "")} +checkeq(t, {1}) +p = m.Cf(m.Ct(true) * m.Cg(m.C(m.R"az"^1) * "=" * m.C(m.R"az"^1) * ";")^0, + rawset) +t = p:match("a=b;c=du;xux=yuy;") +checkeq(t, {a="b", c="du", xux="yuy"}) + + +-- errors in accumulator capture + +-- no initial capture +checkerr("no initial value", m.match, m.Cf(m.P(5), print), 'aaaaaa') +-- no initial capture (very long match forces fold to be a pair open-close) +checkerr("no initial value", m.match, m.Cf(m.P(500), print), + string.rep('a', 600)) + +-- nested capture produces no initial value +checkerr("no initial value", m.match, m.Cf(m.P(1) / {}, print), "alo") + + +-- tests for loop checker + +local function isnullable (p) + checkerr("may accept empty string", function (p) return p^0 end, m.P(p)) +end + +isnullable(m.P("x")^-4) +assert(m.match(((m.P(0) + 1) * m.S"al")^0, "alo") == 3) +assert(m.match((("x" + #m.P(1))^-4 * m.S"al")^0, "alo") == 3) +isnullable("") +isnullable(m.P("x")^0) +isnullable(m.P("x")^-1) +isnullable(m.P("x") + 1 + 2 + m.P("a")^-1) +isnullable(-m.P("ab")) +isnullable(- -m.P("ab")) +isnullable(# #(m.P("ab") + "xy")) +isnullable(- #m.P("ab")^0) +isnullable(# -m.P("ab")^1) +isnullable(#m.V(3)) +isnullable(m.V(3) + m.V(1) + m.P('a')^-1) +isnullable({[1] = m.V(2) * m.V(3), [2] = m.V(3), [3] = m.P(0)}) +assert(m.match(m.P{[1] = m.V(2) * m.V(3), [2] = m.V(3), [3] = m.P(1)}^0, "abc") + == 3) +assert(m.match(m.P""^-3, "a") == 1) + +local function find (p, s) + return m.match(basiclookfor(p), s) +end + + +local function badgrammar (g, expected) + local stat, msg = pcall(m.P, g) + assert(not stat) + if expected then assert(find(expected, msg)) end +end + +badgrammar({[1] = m.V(1)}, "rule '1'") +badgrammar({[1] = m.V(2)}, "rule '2'") -- invalid non-terminal +badgrammar({[1] = m.V"x"}, "rule 'x'") -- invalid non-terminal +badgrammar({[1] = m.V{}}, "rule '(a table)'") -- invalid non-terminal +badgrammar({[1] = #m.P("a") * m.V(1)}, "rule '1'") -- left-recursive +badgrammar({[1] = -m.P("a") * m.V(1)}, "rule '1'") -- left-recursive +badgrammar({[1] = -1 * m.V(1)}, "rule '1'") -- left-recursive +badgrammar({[1] = -1 + m.V(1)}, "rule '1'") -- left-recursive +badgrammar({[1] = 1 * m.V(2), [2] = m.V(2)}, "rule '2'") -- left-recursive +badgrammar({[1] = 1 * m.V(2)^0, [2] = m.P(0)}, "rule '1'") -- inf. loop +badgrammar({ m.V(2), m.V(3)^0, m.P"" }, "rule '2'") -- inf. loop +badgrammar({ m.V(2) * m.V(3)^0, m.V(3)^0, m.P"" }, "rule '1'") -- inf. loop +badgrammar({"x", x = #(m.V(1) * 'a') }, "rule '1'") -- inf. loop +badgrammar({ -(m.V(1) * 'a') }, "rule '1'") -- inf. loop +badgrammar({"x", x = m.P'a'^-1 * m.V"x"}, "rule 'x'") -- left recursive +badgrammar({"x", x = m.P'a' * m.V"y"^1, y = #m.P(1)}, "rule 'x'") + +assert(m.match({'a' * -m.V(1)}, "aaa") == 2) +assert(m.match({'a' * -m.V(1)}, "aaaa") == nil) + + +-- good x bad grammars +m.P{ ('a' * m.V(1))^-1 } +m.P{ -('a' * m.V(1)) } +m.P{ ('abc' * m.V(1))^-1 } +m.P{ -('abc' * m.V(1)) } +badgrammar{ #m.P('abc') * m.V(1) } +badgrammar{ -('a' + m.V(1)) } +m.P{ #('a' * m.V(1)) } +badgrammar{ #('a' + m.V(1)) } +m.P{ m.B{ m.P'abc' } * 'a' * m.V(1) } +badgrammar{ m.B{ m.P'abc' } * m.V(1) } +badgrammar{ ('a' + m.P'bcd')^-1 * m.V(1) } + + +-- simple tests for maximum sizes: +local p = m.P"a" +for i=1,14 do p = p * p end + +p = {} +for i=1,100 do p[i] = m.P"a" end +p = m.P(p) + + +-- strange values for rule labels + +p = m.P{ "print", + print = m.V(print), + [print] = m.V(_G), + [_G] = m.P"a", + } + +assert(p:match("a")) + +-- initial rule +g = {} +for i = 1, 10 do g["i"..i] = "a" * m.V("i"..i+1) end +g.i11 = m.P"" +for i = 1, 10 do + g[1] = "i"..i + local p = m.P(g) + assert(p:match("aaaaaaaaaaa") == 11 - i + 1) +end + +print"+" + + +-- tests for back references +checkerr("back reference 'x' not found", m.match, m.Cb('x'), '') +checkerr("back reference 'b' not found", m.match, m.Cg(1, 'a') * m.Cb('b'), 'a') + +p = m.Cg(m.C(1) * m.C(1), "k") * m.Ct(m.Cb("k")) +t = p:match("ab") +checkeq(t, {"a", "b"}) + +p = m.P(true) +for i = 1, 10 do p = p * m.Cg(1, i) end +for i = 1, 10 do + local p = p * m.Cb(i) + assert(p:match('abcdefghij') == string.sub('abcdefghij', i, i)) +end + + +t = {} +function foo (p) t[#t + 1] = p; return p .. "x" end + +p = m.Cg(m.C(2) / foo, "x") * m.Cb"x" * + m.Cg(m.Cb('x') / foo, "x") * m.Cb"x" * + m.Cg(m.Cb('x') / foo, "x") * m.Cb"x" * + m.Cg(m.Cb('x') / foo, "x") * m.Cb"x" +x = {p:match'ab'} +checkeq(x, {'abx', 'abxx', 'abxxx', 'abxxxx'}) +checkeq(t, {'ab', + 'ab', 'abx', + 'ab', 'abx', 'abxx', + 'ab', 'abx', 'abxx', 'abxxx'}) + + + +-- tests for match-time captures + +p = m.P'a' * (function (s, i) return (s:sub(i, i) == 'b') and i + 1 end) + + 'acd' + +assert(p:match('abc') == 3) +assert(p:match('acd') == 4) + +local function id (s, i, ...) + return true, ... +end + +assert(m.Cmt(m.Cs((m.Cmt(m.S'abc' / { a = 'x', c = 'y' }, id) + + m.R'09'^1 / string.char + + m.P(1))^0), id):match"acb98+68c" == "xyb\98+\68y") + +p = m.P{'S', + S = m.V'atom' * space + + m.Cmt(m.Ct("(" * space * (m.Cmt(m.V'S'^1, id) + m.P(true)) * ")" * space), id), + atom = m.Cmt(m.C(m.R("AZ", "az", "09")^1), id) +} +x = p:match"(a g () ((b) c) (d (e)))" +checkeq(x, {'a', 'g', {}, {{'b'}, 'c'}, {'d', {'e'}}}); + +x = {(m.Cmt(1, id)^0):match(string.rep('a', 500))} +assert(#x == 500) + +local function id(s, i, x) + if x == 'a' then return i, 1, 3, 7 + else return nil, 2, 4, 6, 8 + end +end + +p = ((m.P(id) * 1 + m.Cmt(2, id) * 1 + m.Cmt(1, id) * 1))^0 +assert(table.concat{p:match('abababab')} == string.rep('137', 4)) + +local function ref (s, i, x) + return m.match(x, s, i - x:len()) +end + +assert(m.Cmt(m.P(1)^0, ref):match('alo') == 4) +assert((m.P(1) * m.Cmt(m.P(1)^0, ref)):match('alo') == 4) +assert(not (m.P(1) * m.Cmt(m.C(1)^0, ref)):match('alo')) + +ref = function (s,i,x) return i == tonumber(x) and i, 'xuxu' end + +assert(m.Cmt(1, ref):match'2') +assert(not m.Cmt(1, ref):match'1') +assert(m.Cmt(m.P(1)^0, ref):match'03') + +function ref (s, i, a, b) + if a == b then return i, a:upper() end +end + +p = m.Cmt(m.C(m.R"az"^1) * "-" * m.C(m.R"az"^1), ref) +p = (any - p)^0 * p * any^0 * -1 + +assert(p:match'abbbc-bc ddaa' == 'BC') + +do -- match-time captures cannot be optimized away + local touch = 0 + f = m.P(function () touch = touch + 1; return true end) + + local function check(n) n = n or 1; assert(touch == n); touch = 0 end + + assert(m.match(f * false + 'b', 'a') == nil); check() + assert(m.match(f * false + 'b', '') == nil); check() + assert(m.match( (f * 'a')^0 * 'b', 'b') == 2); check() + assert(m.match( (f * 'a')^0 * 'b', '') == nil); check() + assert(m.match( (f * 'a')^-1 * 'b', 'b') == 2); check() + assert(m.match( (f * 'a')^-1 * 'b', '') == nil); check() + assert(m.match( ('b' + f * 'a')^-1 * 'b', '') == nil); check() + assert(m.match( (m.P'b'^-1 * f * 'a')^-1 * 'b', '') == nil); check() + assert(m.match( (-m.P(1) * m.P'b'^-1 * f * 'a')^-1 * 'b', '') == nil); + check() + assert(m.match( (f * 'a' + 'b')^-1 * 'b', '') == nil); check() + assert(m.match(f * 'a' + f * 'b', 'b') == 2); check(2) + assert(m.match(f * 'a' + f * 'b', 'a') == 2); check(1) + assert(m.match(-f * 'a' + 'b', 'b') == 2); check(1) + assert(m.match(-f * 'a' + 'b', '') == nil); check(1) +end + +c = '[' * m.Cg(m.P'='^0, "init") * '[' * + { m.Cmt(']' * m.C(m.P'='^0) * ']' * m.Cb("init"), function (_, _, s1, s2) + return s1 == s2 end) + + 1 * m.V(1) } / 0 + +assert(c:match'[==[]]====]]]]==]===[]' == 18) +assert(c:match'[[]=]====]=]]]==]===[]' == 14) +assert(not c:match'[[]=]====]=]=]==]===[]') + + +-- old bug: optimization of concat with fail removed match-time capture +p = m.Cmt(0, function (s) p = s end) * m.P(false) +assert(not p:match('alo')) +assert(p == 'alo') + + +-- ensure that failed match-time captures are not kept on Lua stack +do + local t = {__mode = "kv"}; setmetatable(t,t) + local c = 0 + + local function foo (s,i) + collectgarbage(); + assert(next(t) == "__mode" and next(t, "__mode") == nil) + local x = {} + t[x] = true + c = c + 1 + return i, x + end + + local p = m.P{ m.Cmt(0, foo) * m.P(false) + m.P(1) * m.V(1) + m.P"" } + p:match(string.rep('1', 10)) + assert(c == 11) +end + +p = (m.P(function () return true, "a" end) * 'a' + + m.P(function (s, i) return i, "aa", 20 end) * 'b' + + m.P(function (s,i) if i <= #s then return i, "aaa" end end) * 1)^0 + +t = {p:match('abacc')} +checkeq(t, {'a', 'aa', 20, 'a', 'aaa', 'aaa'}) + + +------------------------------------------------------------------- +-- Tests for 're' module +------------------------------------------------------------------- + +local re = require "relabel" + +local match, compile = re.match, re.compile + + + +assert(match("a", ".") == 2) +assert(match("a", "''") == 1) +assert(match("", " ! . ") == 1) +assert(not match("a", " ! . ")) +assert(match("abcde", " ( . . ) * ") == 5) +assert(match("abbcde", " [a-c] +") == 5) +assert(match("0abbc1de", "'0' [a-c]+ '1'") == 7) +assert(match("0zz1dda", "'0' [^a-c]+ 'a'") == 8) +assert(match("abbc--", " [a-c] + +") == 5) +assert(match("abbc--", " [ac-] +") == 2) +assert(match("abbc--", " [-acb] + ") == 7) +assert(not match("abbcde", " [b-z] + ")) +assert(match("abb\"de", '"abb"["]"de"') == 7) +assert(match("abceeef", "'ac' ? 'ab' * 'c' { 'e' * } / 'abceeef' ") == "eee") +assert(match("abceeef", "'ac'? 'ab'* 'c' { 'f'+ } / 'abceeef' ") == 8) +local t = {match("abceefe", "( ( & 'e' {} ) ? . ) * ")} +checkeq(t, {4, 5, 7}) +local t = {match("abceefe", "((&&'e' {})? .)*")} +checkeq(t, {4, 5, 7}) +local t = {match("abceefe", "( ( ! ! 'e' {} ) ? . ) *")} +checkeq(t, {4, 5, 7}) +local t = {match("abceefe", "(( & ! & ! 'e' {})? .)*")} +checkeq(t, {4, 5, 7}) + +assert(match("cccx" , "'ab'? ('ccc' / ('cde' / 'cd'*)? / 'ccc') 'x'+") == 5) +assert(match("cdx" , "'ab'? ('ccc' / ('cde' / 'cd'*)? / 'ccc') 'x'+") == 4) +assert(match("abcdcdx" , "'ab'? ('ccc' / ('cde' / 'cd'*)? / 'ccc') 'x'+") == 8) + +assert(match("abc", "a <- (. a)?") == 4) +b = "balanced <- '(' ([^()] / balanced)* ')'" +assert(match("(abc)", b)) +assert(match("(a(b)((c) (d)))", b)) +assert(not match("(a(b ((c) (d)))", b)) + +b = compile[[ balanced <- "(" ([^()] / balanced)* ")" ]] +assert(b == m.P(b)) +assert(b:match"((((a))(b)))") + +local g = [[ + S <- "0" B / "1" A / "" -- balanced strings + A <- "0" S / "1" A A -- one more 0 + B <- "1" S / "0" B B -- one more 1 +]] +assert(match("00011011", g) == 9) + +local g = [[ + S <- ("0" B / "1" A)* + A <- "0" / "1" A A + B <- "1" / "0" B B +]] +assert(match("00011011", g) == 9) +assert(match("000110110", g) == 9) +assert(match("011110110", g) == 3) +assert(match("000110010", g) == 1) + +s = "aaaaaaaaaaaaaaaaaaaaaaaa" +assert(match(s, "'a'^3") == 4) +assert(match(s, "'a'^0") == 1) +assert(match(s, "'a'^+3") == s:len() + 1) +assert(not match(s, "'a'^+30")) +assert(match(s, "'a'^-30") == s:len() + 1) +assert(match(s, "'a'^-5") == 6) +for i = 1, s:len() do + assert(match(s, string.format("'a'^+%d", i)) >= i + 1) + assert(match(s, string.format("'a'^-%d", i)) <= i + 1) + assert(match(s, string.format("'a'^%d", i)) == i + 1) +end +assert(match("01234567890123456789", "[0-9]^3+") == 19) + + +assert(match("01234567890123456789", "({....}{...}) -> '%2%1'") == "4560123") +t = match("0123456789", "{| {.}* |}") +checkeq(t, {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9"}) +assert(match("012345", "{| (..) -> '%0%0' |}")[1] == "0101") + +assert(match("abcdef", "( {.} {.} {.} {.} {.} ) -> 3") == "c") +assert(match("abcdef", "( {:x: . :} {.} {.} {.} {.} ) -> 3") == "d") +assert(match("abcdef", "( {:x: . :} {.} {.} {.} {.} ) -> 0") == 6) + +assert(not match("abcdef", "{:x: ({.} {.} {.}) -> 2 :} =x")) +assert(match("abcbef", "{:x: ({.} {.} {.}) -> 2 :} =x")) + +eqcharset(compile"[]]", "]") +eqcharset(compile"[][]", m.S"[]") +eqcharset(compile"[]-]", m.S"-]") +eqcharset(compile"[-]", m.S"-") +eqcharset(compile"[az-]", m.S"a-z") +eqcharset(compile"[-az]", m.S"a-z") +eqcharset(compile"[a-z]", m.R"az") +eqcharset(compile"[]['\"]", m.S[[]['"]]) + +eqcharset(compile"[^]]", any - "]") +eqcharset(compile"[^][]", any - m.S"[]") +eqcharset(compile"[^]-]", any - m.S"-]") +eqcharset(compile"[^]-]", any - m.S"-]") +eqcharset(compile"[^-]", any - m.S"-") +eqcharset(compile"[^az-]", any - m.S"a-z") +eqcharset(compile"[^-az]", any - m.S"a-z") +eqcharset(compile"[^a-z]", any - m.R"az") +eqcharset(compile"[^]['\"]", any - m.S[[]['"]]) + +-- tests for comments in 're' +e = compile[[ +A <- _B -- \t \n %nl .<> <- -> -- +_B <- 'x' --]] +assert(e:match'xy' == 2) + +-- tests for 're' with pre-definitions +defs = {digits = m.R"09", letters = m.R"az", _=m.P"__"} +e = compile("%letters (%letters / %digits)*", defs) +assert(e:match"x123" == 5) +e = compile("%_", defs) +assert(e:match"__" == 3) + +e = compile([[ + S <- A+ + A <- %letters+ B + B <- %digits+ +]], defs) + +e = compile("{[0-9]+'.'?[0-9]*} -> sin", math) +assert(e:match("2.34") == math.sin(2.34)) + + +function eq (_, _, a, b) return a == b end + +c = re.compile([[ + longstring <- '[' {:init: '='* :} '[' close + close <- ']' =init ']' / . close +]]) + +assert(c:match'[==[]]===]]]]==]===[]' == 17) +assert(c:match'[[]=]====]=]]]==]===[]' == 14) +assert(not c:match'[[]=]====]=]=]==]===[]') + +c = re.compile" '[' {:init: '='* :} '[' (!(']' =init ']') .)* ']' =init ']' !. " + +assert(c:match'[==[]]===]]]]==]') +assert(c:match'[[]=]====]=][]==]===[]]') +assert(not c:match'[[]=]====]=]=]==]===[]') + +assert(re.find("hi alalo", "{:x:..:} =x") == 4) +assert(re.find("hi alalo", "{:x:..:} =x", 4) == 4) +assert(not re.find("hi alalo", "{:x:..:} =x", 5)) +assert(re.find("hi alalo", "{'al'}", 5) == 6) +assert(re.find("hi aloalolo", "{:x:..:} =x") == 8) +assert(re.find("alo alohi x x", "{:word:%w+:}%W*(=word)!%w") == 11) + +-- re.find discards any captures +local a,b,c = re.find("alo", "{.}{'o'}") +assert(a == 2 and b == 3 and c == nil) + +local function match (s,p) + local i,e = re.find(s,p) + if i then return s:sub(i, e) end +end +assert(match("alo alo", '[a-z]+') == "alo") +assert(match("alo alo", '{:x: [a-z]+ :} =x') == nil) +assert(match("alo alo", "{:x: [a-z]+ :} ' ' =x") == "alo alo") + +assert(re.gsub("alo alo", "[abc]", "x") == "xlo xlo") +assert(re.gsub("alo alo", "%w+", ".") == ". .") +assert(re.gsub("hi, how are you", "[aeiou]", string.upper) == + "hI, hOw ArE yOU") + +s = 'hi [[a comment[=]=] ending here]] and [=[another]]=]]' +c = re.compile" '[' {:i: '='* :} '[' (!(']' =i ']') .)* ']' { =i } ']' " +assert(re.gsub(s, c, "%2") == 'hi and =]') +assert(re.gsub(s, c, "%0") == s) +assert(re.gsub('[=[hi]=]', c, "%2") == '=') + +assert(re.find("", "!.") == 1) +assert(re.find("alo", "!.") == 4) + +function addtag (s, i, t, tag) t.tag = tag; return i, t end + +c = re.compile([[ + doc <- block !. + block <- (start {| (block / { [^<]+ })* |} end?) => addtag + start <- '<' {:tag: [a-z]+ :} '>' + end <- '' +]], {addtag = addtag}) + +x = c:match[[ +hihellobuttotheend]] +checkeq(x, {tag='x', 'hi', {tag = 'b', 'hello'}, 'but', + {'totheend'}}) + + +-- tests for look-ahead captures +x = {re.match("alo", "&(&{.}) !{'b'} {&(...)} &{..} {...} {!.}")} +checkeq(x, {"", "alo", ""}) + +assert(re.match("aloalo", + "{~ (((&'al' {.}) -> 'A%1' / (&%l {.}) -> '%1%1') / .)* ~}") + == "AallooAalloo") + +-- bug in 0.9 (and older versions), due to captures in look-aheads +x = re.compile[[ {~ (&(. ([a-z]* -> '*')) ([a-z]+ -> '+') ' '*)* ~} ]] +assert(x:match"alo alo" == "+ +") + +-- valid capture in look-ahead (used inside the look-ahead itself) +x = re.compile[[ + S <- &({:two: .. :} . =two) {[a-z]+} / . S +]] +assert(x:match("hello aloaLo aloalo xuxu") == "aloalo") + + +p = re.compile[[ + block <- {| {:ident:space*:} line + ((=ident !space line) / &(=ident space) block)* |} + line <- {[^%nl]*} %nl + space <- '_' -- should be ' ', but '_' is simpler for editors +]] + +t= p:match[[ +1 +__1.1 +__1.2 +____1.2.1 +____ +2 +__2.1 +]] +checkeq(t, {"1", {"1.1", "1.2", {"1.2.1", "", ident = "____"}, ident = "__"}, + "2", {"2.1", ident = "__"}, ident = ""}) + + +-- nested grammars +p = re.compile[[ + s <- a b !. + b <- ( x <- ('b' x)? ) + a <- ( x <- 'a' x? ) +]] + +assert(p:match'aaabbb') +assert(p:match'aaa') +assert(not p:match'bbb') +assert(not p:match'aaabbba') + +-- testing groups +t = {re.match("abc", "{:S <- {:.:} {S} / '':}")} +checkeq(t, {"a", "bc", "b", "c", "c", ""}) + +t = re.match("1234", "{| {:a:.:} {:b:.:} {:c:.{.}:} |}") +checkeq(t, {a="1", b="2", c="4"}) +t = re.match("1234", "{|{:a:.:} {:b:{.}{.}:} {:c:{.}:}|}") +checkeq(t, {a="1", b="2", c="4"}) +t = re.match("12345", "{| {:.:} {:b:{.}{.}:} {:{.}{.}:} |}") +checkeq(t, {"1", b="2", "4", "5"}) +t = re.match("12345", "{| {:.:} {:{:b:{.}{.}:}:} {:{.}{.}:} |}") +checkeq(t, {"1", "23", "4", "5"}) +t = re.match("12345", "{| {:.:} {{:b:{.}{.}:}} {:{.}{.}:} |}") +checkeq(t, {"1", "23", "4", "5"}) + + +-- testing pre-defined names +assert(os.setlocale("C") == "C") + +function eqlpeggsub (p1, p2) + local s1 = cs2str(re.compile(p1)) + local s2 = string.gsub(allchar, "[^" .. p2 .. "]", "") + -- if s1 ~= s2 then print(#s1,#s2) end + assert(s1 == s2) +end + + +eqlpeggsub("%w", "%w") +eqlpeggsub("%a", "%a") +eqlpeggsub("%l", "%l") +eqlpeggsub("%u", "%u") +eqlpeggsub("%p", "%p") +eqlpeggsub("%d", "%d") +eqlpeggsub("%x", "%x") +eqlpeggsub("%s", "%s") +eqlpeggsub("%c", "%c") + +eqlpeggsub("%W", "%W") +eqlpeggsub("%A", "%A") +eqlpeggsub("%L", "%L") +eqlpeggsub("%U", "%U") +eqlpeggsub("%P", "%P") +eqlpeggsub("%D", "%D") +eqlpeggsub("%X", "%X") +eqlpeggsub("%S", "%S") +eqlpeggsub("%C", "%C") + +eqlpeggsub("[%w]", "%w") +eqlpeggsub("[_%w]", "_%w") +eqlpeggsub("[^%w]", "%W") +eqlpeggsub("[%W%S]", "%W%S") + +re.updatelocale() + + +-- testing nested substitutions x string captures + +p = re.compile[[ + text <- {~ item* ~} + item <- macro / [^()] / '(' item* ')' + arg <- ' '* {~ (!',' item)* ~} + args <- '(' arg (',' arg)* ')' + macro <- ('apply' args) -> '%1(%2)' + / ('add' args) -> '%1 + %2' + / ('mul' args) -> '%1 * %2' +]] + +assert(p:match"add(mul(a,b), apply(f,x))" == "a * b + f(x)") + +rev = re.compile[[ R <- (!.) -> '' / ({.} R) -> '%2%1']] + +assert(rev:match"0123456789" == "9876543210") + + +-- testing error messages in re + +local function errmsg (p, err) + checkerr(err, re.compile, p) +end + +errmsg('aaaa', "rule 'aaaa'") +errmsg('a', 'outside') +errmsg('b <- a', 'undefined') +errmsg("x <- 'a' x <- 'b'", 'already defined') +-- error message is different because Matthew rewrote 're.lua' +--errmsg("'a' -", "near '-'") + + +print"OK" + + diff --git a/06/lpeglabel/testlabel.lua b/06/lpeglabel/testlabel.lua new file mode 100644 index 0000000..e2833ea --- /dev/null +++ b/06/lpeglabel/testlabel.lua @@ -0,0 +1,1054 @@ +local m = require 'lpeglabel' + +local p, r, l, s, serror + +local function checklabeq (x, ...) + y = { ... } + assert(type(x) == "table") + assert(#x == #y) + for i = 1, 3 do + assert(x[i] == y[i]) + end +end + +local function checkeq (x, y, p) + if p then print(x,y) end + if type(x) ~= "table" then assert(x == y) + else + for k,v in pairs(x) do checkeq(v, y[k], p) end + for k,v in pairs(y) do checkeq(v, x[k], p) end + end +end + + +-- tests related to reporting the farthest failure position +-- when a label is not thrown + +p = m.P"a"^0 * m.P"b" + m.P"c" +checklabeq({4, nil, nil}, p:match("aabk")) +checklabeq({2, nil, nil}, p:match("ck")) +checklabeq({nil, 0, "dk"}, p:match("dk")) +checklabeq({nil, 0, "k"}, p:match("aak")) + +p = (m.P"a" + m.P"c")^0 * m.P"b" + m.P"c" +checklabeq({4, nil, nil}, p:match("aabk")) +checklabeq({2, nil, nil}, p:match("ck")) +checklabeq({nil, 0, "dk"}, p:match("dk")) +checklabeq({nil, 0, "k"}, p:match("aak")) + +p = m.P"a"^0 * m.P"b" + m.P(1)^0 * m.P(1) +checklabeq({4, nil, nil}, p:match("aabk")) +checklabeq({nil, 0, ""}, p:match("ck")) +checklabeq({nil, 0, ""}, p:match("aak")) + +p = m.P(1) * m.P"a" + m.P"c" +checklabeq({3, nil, nil}, p:match("bac")) +checklabeq({2, nil, nil}, p:match("c")) +checklabeq({nil, 0, ""}, p:match("x")) +checklabeq({nil, 0, "x"}, p:match("kx")) + +p = m.P"a"^0 * m.P(1) * m.P(1) + m.P"a"^0 * m.P"c" +checklabeq({5, nil, nil}, p:match("aabc")) +checklabeq({4, nil, nil}, p:match("aac")) +checklabeq({nil, 0, ""}, p:match("aak")) +checklabeq({nil, 0, ""}, p:match("x")) + +p = m.P"a"^0 * m.P(1) * m.P(1) + m.P"a"^0 * m.P"c" +checklabeq({5, nil, nil}, p:match("aabc")) +checklabeq({4, nil, nil}, p:match("aac")) +checklabeq({nil, 0, ""}, p:match("aak")) +checklabeq({nil, 0, ""}, p:match("x")) + +p = m.Cmt(m.P"a"^0, function() return nil end) + m.P"x" +checklabeq({2, nil, nil}, p:match("xabc")) +checklabeq({nil, 0, "c"}, p:match("aac")) +checklabeq({nil, 0, "kx"}, p:match("kx")) + +p = m.P"b" * -m.P"a" + m.P"c" +checklabeq({nil, 0, "a"}, p:match("ba")) +checklabeq({nil, 0, "kx"}, p:match("kx")) + +p = (m.P"c" + m.P"a") * m.P("b" + m.P"d") + m.P"xxx" +checklabeq({nil, 0, "kk"}, p:match("kk")) +checklabeq({nil, 0, "k"}, p:match("ak")) +checklabeq({nil, 0, "y"}, p:match("xxy")) +checklabeq({nil, 0, "yz"}, p:match("xyz")) + +print"+" + + +-- throws a label +p = m.T(1) +s = "abc" +r, l, serror = p:match(s) +assert(r == nil and l == 1 and serror == "abc") + +-- throws a label, choice does not catch labels +p = m.T(1) + m.P"a" +r, l, serror = p:match(s) +assert(r == nil and l == 1 and serror == "abc") + +-- again throws a label that is not caught by choice +local g = m.P{ + "S", + S = m.V"A" + m.V"B", + A = m.T(1), + B = m.P"a" +} +r, l, serror = g:match(s) +assert(r == nil and l == 1 and serror == "abc") + +-- throws a label in a position that is not the farthest one +-- but it is the position that should be reported +p = m.P(1) * m.P"a" + m.T(11) +checklabeq({3, nil, nil}, p:match("bac")) +checklabeq({nil, 11, "c"}, p:match("c")) +checklabeq({nil, 11, "x"}, p:match("x")) +checklabeq({nil, 11, "kx"}, p:match("kx")) + + +-- throws a label that is not caught by the recovery operator +p = m.Rec(m.T(2), m.P"a", 1, 3) +r, l, serror = p:match(s) +assert(r == nil and l == 2 and serror == "abc") + +-- wraps the previous pattern with a recovery that catches label "2" +p = m.Rec(p, m.P"a", 2) +assert(p:match(s) == 2) + +-- throws a label that is caught by recovery +p = m.Rec(m.T(25), m.P"a", 25) +assert(p:match(s) == 2) + +-- "fail" is label "0" +-- throws the "fail" label after the recovery +s = "bola" +r, l, serror = p:match("bola") +assert(r == nil and l == 0 and serror == "bola") + +-- Recovery does not catch "fail" by default +p = m.Rec(m.P"b", m.P"a", 1) + +r, l, serror = p:match("abc") +assert(r == nil and l == 0 and serror == "abc") + +assert(p:match("bola") == 2) + + +-- recovery operator catches "1" or "3" +p = m.Rec((m.P"a" + m.T(1)) * m.T(3), (m.P"a" + m.P"b"), 1, 3) +assert(p:match("aac") == 3) +assert(p:match("abc") == 3) +r, l, serror = p:match("acc") +assert(r == nil and l == 0 and serror == "cc") + +--throws 1, recovery pattern matches 'b', throw 3, and rec pat mathces 'a' +assert(p:match("bac") == 3) + +r, l, serror = p:match("cab") +assert(r == nil and l == 0 and serror == "cab") + + +-- associativity +-- (p1 / %1) //{1} (p2 / %2) //{2} p3 +-- left-associativity +-- ("a" //{1} "b") //{2} "c" +p = m.Rec(m.Rec(m.P"a" + m.T(1), m.P"b" + m.T(2), 1), m.P"c", 2) +assert(p:match("abc") == 2) +assert(p:match("bac") == 2) +assert(p:match("cab") == 2) +r, l, serror = p:match("dab") +assert(r == nil and l == 0 and serror == "dab") + + +-- righ-associativity +-- "a" //{1} ("b" //{2} "c") +p = m.Rec(m.P"a" + m.T(1), m.Rec(m.P"b" + m.T(2), m.P"c", 2), 1) +assert(p:match("abc") == 2) +assert(p:match("bac") == 2) +assert(p:match("cab") == 2) +r, l, serror = p:match("dab") +assert(r == nil and l == 0 and serror == "dab") + + +-- associativity -> in this case the error thrown by p1 is only +-- recovered when we have a left-associative operator +-- (p1 / %2) //{1} (p2 / %2) //{2} p3 +-- left-associativity +-- ("a" //{1} "b") //{2} "c" +p = m.Rec(m.Rec(m.P"a" + m.T(2), m.P"b" + m.T(2), 1), m.P"c", 2) +assert(p:match("abc") == 2) +r, l, serror = p:match("bac") +assert(r == nil and l == 0 and serror == "bac") +assert(p:match("cab") == 2) +r, l, serror = p:match("dab") +assert(r == nil and l == 0 and serror == "dab") + + +-- righ-associativity +-- "a" //{1} ("b" //{2} "c") +p = m.Rec(m.P"a" + m.T(2), m.Rec(m.P"b" + m.T(2), m.P"c", 2), 1) +assert(p:match("abc") == 2) +r, l, serror = p:match("bac") +assert(r == nil and l == 2 and serror == "bac") +r, l, serror = p:match("cab") +assert(r == nil and l == 2 and serror == "cab") +r, l, serror = p:match("dab") +assert(r == nil and l == 2 and serror == "dab") + + + +-- tests related to predicates +p = #m.T(1) + m.P"a" +r, l, serror = p:match("abc") +assert(r == nil and l == 1 and serror == "abc") + +p = ##m.T(1) + m.P"a" +r, l, serror = p:match("abc") +assert(r == nil and l == 1 and serror == "abc") + +p = -m.T(1) * m.P"a" +r, l, serror = p:match("abc") +assert(r == nil and l == 1 and serror == "abc") + +p = -m.T(1) * m.P"a" +r, l, serror = p:match("bbc") +assert(r == nil and l == 1 and serror == "bbc") + +p = -(-m.T(1)) * m.P"a" +r, l, serror = p:match("abc") +assert(r == nil and l == 1 and serror == "abc") + +p = m.Rec(-m.T(22), m.P"a", 22) +r, l, serror = p:match("abc") +assert(r == nil and l == 0 and serror == "bc") + +assert(p:match("bbc") == 1) + +p = m.Rec(#m.T(22), m.P"a", 22) +assert(p:match("abc") == 1) + +p = #m.Rec(m.T(22), m.P"a", 22) +assert(p:match("abc") == 1) + +p = m.Rec(m.T(22), #m.P"a", 22) +assert(p:match("abc") == 1) + +p = m.Rec(#m.T(22), m.P"a", 22) +r, l, serror = p:match("bbc") +assert(r == nil and l == 0 and serror == "bbc") + +p = m.Rec(#m.P("a") * m.T(22), m.T(15), 22) +r, l, serror = p:match("abc") +assert(r == nil and l == 15 and serror == "abc") + +p = m.Rec(#(m.P("a") * m.T(22)), m.T(15), 22) +r, l, serror = p:match("abc") +assert(r == nil and l == 15 and serror == "bc") + + + +-- tests related to repetition +p = m.T(1)^0 +r, l, serror = p:match("ab") +assert(r == nil and l == 1 and serror == "ab") + +p = (m.P"a" + m.T(1))^0 +r, l, serror = p:match("aa") +assert(r == nil and l == 1 and serror == "") + + +-- Bug reported by Matthew Allen +-- some optmizations performed by LPeg should not be +-- applied in case of labeled choices +p = m.Rec(m.P"A", m.P(true), 1) + m.P("B") +assert(p:match("B") == 2) + +p = m.Rec(m.P"A", m.P(false), 1) + m.P("B") +assert(p:match("B") == 2) + + +--[[ +S -> A //{1} 'a' +A -> B +B -> %1 +]] +g = m.P{ + "S", + S = m.Rec(m.V"A", m.P"a", 1), + A = m.V"B", + B = m.T(1), +} +assert(g:match("ab") == 2) +r, l, serror = g:match("bc") +assert(r == nil and l == 0 and serror == "bc") + + +--[[ +S -> A +A -> (B (';' / %{1}))* +B -> 'a' +]] +g = m.P{ + "S", + S = m.V"A", + A = m.P(m.V"B" * (";" + m.T(1)))^0, + B = m.P'a', +} +assert(g:match("a;a;") == 5) + +r, l, serror = g:match("a;a") +assert(r == nil and l == 1 and serror == "") + + +-- %1 //{1,3} %2 //{2} 'a' +p = m.Rec(m.Rec(m.T(1), m.T(2), 1, 3), m.P"a", 2) +assert(p:match("abc") == 2) + +r, l, serror = p:match("") +assert(r == nil and l == 0 and serror == "") + +p = m.Rec(m.T(1), m.Rec(m.T(2), m.P"a", 2), 1, 3) +assert(p:match("abc") == 2) + +r, l, serror = p:match("") +assert(r == nil and l == 0 and serror == "") + + +-- Infinte Loop TODO: check the semantics +-- %1 //{1} %1 +p = m.Rec(m.T(1), m.T(1), 1) +--r, l, serror = p:match("ab") +--assert(r == nil and l == 1 and serror == "ab") + +-- %1 //{1} 'a' (!. / %1) +p = m.Rec(m.T(1), m.P"a" * (-m.P(1) + m.T(1)), 1) +r, l, serror = p:match("ab") +assert(r == nil and l == 0 and serror == "b") + +r, l, serror = p:match("cd") +assert(r == nil and l == 0 and serror == "cd") + +-- %1 //{1} . (!. / %1) +p = m.Rec(m.T(1), m.P(1) * (-m.P(1) + m.T(1)), 1) +assert(p:match("abc") == 4) + + +-- testing the limit of labels +-- can only throw labels between 1 and 255 +local r = pcall(m.Rec, m.P"b", m.P"a", 0) +assert(r == false) + +local r = pcall(m.Rec, m.P"b", m.P"a", 256) +assert(r == false) + +local r = pcall(m.Rec, m.P"b", m.P"a", -1) +assert(r == false) + +local r = pcall(m.T, 0) +assert(r == false) + +local r = pcall(m.T, 256) +assert(r == false) + +local r = pcall(m.T, -1) +assert(r == false) + + +local r = m.Rec(m.P"b", m.P"a", 255) +assert(p:match("a") == 2) + +p = m.T(255) +s = "abc" +r, l, serror = p:match(s) +assert(r == nil and l == 255 and serror == "abc") + + + +print("+") + +--[[ grammar based on Figure 8 of paper submitted to SCP +S -> S0 //{1} ID //{2} ID '=' Exp //{3} 'unsigned'* 'int' ID //{4} 'unsigned'* ID ID / %error +S0 -> S1 / S2 / &'int' %3 +S1 -> &(ID '=') %2 / &(ID !.) %1 / &ID %4 +S2 -> &('unsigned'+ ID) %4 / & ('unsigned'+ 'int') %3 +]] +local sp = m.S" \t\n"^0 +local eq = sp * m.P"=" + +g = m.P{ + "S", + S = m.Rec( + m.Rec( + m.Rec( + m.Rec(m.V"S0", m.V"ID", 1), + m.V"ID" * eq * m.V"Exp", 2 + ), + m.V"U"^0 * m.V"I" * m.V"ID", 3 + ), + m.V"U"^0 * m.V"ID" * m.V"ID", 4) + + m.T(5), -- error + S0 = m.V"S1" + m.V"S2" + #m.V"I" * m.T(3), + S1 = #(m.V"ID" * eq) * m.T(2) + sp * #(m.V"ID" * -m.P(1)) * m.T(1) + #m.V"ID" * m.T(4), + S2 = #(m.V"U"^1 * m.V"ID") * m.T(4) + #(m.V"U"^1 * m.V"I") * m.T(3), + ID = sp * m.P"a", + U = sp * m.P"unsigned", + I = sp * m.P"int", + Exp = sp * m.P"E", +} + +local s = "a" +assert(g:match(s) == #s + 1) --1 +s = "a = E" +assert(g:match(s) == #s + 1) --2 +s = "int a" +assert(g:match(s) == #s + 1) --3 +s = "unsigned int a" +assert(g:match(s) == #s + 1) --3 +s = "unsigned a a" +assert(g:match(s) == #s + 1) --4 + +s = "b" +r, l, serror = g:match(s) +assert(r == nil and l == 5 and serror == "b") + +s = "unsigned" +r, l, serror = g:match(s) +assert(r == nil and l == 5 and serror == s) + +s = "unsigned a" +r, l, serror = g:match(s) +assert(r == nil and l == 5 and serror == s) + +s = "unsigned int" +r, l, serror = g:match(s) +assert(r == nil and l == 5 and serror == s) + + +print("+") + + +local re = require 'relabel' + +g = re.compile[['a' //{4,9} [a-z] +]] +assert(g:match("a") == 2) +r, l, serror = g:match("b") +assert(r == nil and l == 0 and serror == "b") + +g = re.compile[['a' //{4,9} [a-f] //{5, 7} [a-z] +]] +assert(g:match("a") == 2) +r, l, serror = g:match("b") +assert(r == nil and l == 0 and serror == "b") + +g = re.compile[[%{1} //{4,9} [a-z] +]] +r, l, serror = g:match("a") +assert(r == nil and l == 1 and serror == "a") + + +g = re.compile[[%{1} //{4,1} [a-f] +]] +assert(g:match("a") == 2) +r, l, serror = g:match("h") +assert(r == nil and l == 0 and serror == "h") + +g = re.compile[[[a-f]%{9} //{4,9} [a-c]%{7} //{5, 7} [a-z] ]] +r, l, serror = g:match("a") +assert(r == nil and l == 0 and serror == "") +r, l, serror = g:match("aa") +assert(r == nil and l == 0 and serror == "") +assert(g:match("aaa") == 4) + +r, l, serror = g:match("ad") +assert(r == nil and l == 0 and serror == "d") + +r, l, serror = g:match("g") +assert(r == nil and l == 0 and serror == "g") + + +--[[ grammar based on Figure 8 of paper submitted to SCP +S -> S0 //{1} ID //{2} ID '=' Exp //{3} 'unsigned'* 'int' ID //{4} 'unsigned'* ID ID / %error +S0 -> S1 / S2 / &'int' %3 +S1 -> &(ID '=') %2 / &(ID !.) %1 / &ID %4 +S2 -> &('unsigned'+ ID) %4 / & ('unsigned'+ 'int') %3 +]] + +g = re.compile([[ + S <- S0 //{1} ID //{2} ID %s* '=' Exp //{3} U* Int ID //{4} U ID ID / %{5} + S0 <- S1 / S2 / &Int %{3} + S1 <- &(ID %s* '=') %{2} / &(ID !.) %{1} / &ID %{4} + S2 <- &(U+ ID) %{4} / &(U+ Int) %{3} + ID <- %s* 'a' + U <- %s* 'unsigned' + Int <- %s* 'int' + Exp <- %s* 'E' +]]) + +local s = "a" +assert(g:match(s) == #s + 1) --1 +s = "a = E" +assert(g:match(s) == #s + 1) --2 +s = "int a" +assert(g:match(s) == #s + 1) --3 +s = "unsigned int a" +assert(g:match(s) == #s + 1) --3 +s = "unsigned a a" +assert(g:match(s) == #s + 1) --4 +s = "b" +r, l, serror = g:match(s) +assert(r == nil and l == 5 and serror == s) +s = "unsigned" +r, l, serror = g:match(s) +assert(r == nil and l == 5 and serror == s) +s = "unsigned a" +r, l, serror = g:match(s) +assert(r == nil and l == 5 and serror == s) +s = "unsigned int" +r, l, serror = g:match(s) +assert(r == nil and l == 5 and serror == s) + + + +local terror = { ['cmdSeq'] = "Missing ';' in CmdSeq", + ['ifExp'] = "Error in expresion of 'if'", + ['ifThen'] = "Error matching 'then' keyword", + ['ifThenCmdSeq'] = "Error matching CmdSeq of 'then' branch", + ['ifElseCmdSeq'] = "Error matching CmdSeq of 'else' branch", + ['ifEnd'] = "Error matching 'end' keyword of 'if'", + ['repeatCmdSeq'] = "Error matching CmdSeq of 'repeat'", + ['repeatUntil'] = "Error matching 'until' keyword", + ['repeatExp'] = "Error matching expression of 'until'", + ['assignOp'] = "Error matching ':='", + ['assignExp'] = "Error matching expression of assignment", + ['readName'] = "Error matching 'NAME' after 'read'", + ['writeExp'] = "Error matching expression after 'write'", + ['simpleExp'] = "Error matching 'SimpleExp'", + ['term'] = "Error matching 'Term'", + ['factor'] = "Error matching 'Factor'", + ['openParExp'] = "Error matching expression after '('", + ['closePar'] = "Error matching ')'", + ['undefined'] = "Undefined Error"} + +g = re.compile([[ + Tiny <- CmdSeq //{1} '' -> cmdSeq //{2} '' -> ifExp //{3} '' -> ifThen //{4} '' -> ifThenCmdSeq + //{5} '' -> ifElseCmdSeq //{6} '' -> ifEnd //{7} '' -> repeatCmdSeq + //{8} '' -> repeatUntil //{9} '' -> repeatExp //{10} '' -> assignOp + //{11} '' -> assignExp //{12} '' -> readName //{13} '' -> writeExp + //{14} '' -> simpleExp //{15} '' -> term //{16} '' -> factor + //{17} '' -> openParExp //{18} '' -> closePar / '' -> undefined + CmdSeq <- (Cmd (SEMICOLON / %{1})) (Cmd (SEMICOLON / %{1}))* + Cmd <- IfCmd / RepeatCmd / ReadCmd / WriteCmd / AssignCmd + IfCmd <- IF (Exp / %{2}) (THEN / %{3}) (CmdSeq / %{4}) (ELSE (CmdSeq / %{5}) / '') (END / %{6}) + RepeatCmd <- REPEAT (CmdSeq / %{7}) (UNTIL / %{8}) (Exp / %{9}) + AssignCmd <- NAME (ASSIGNMENT / %{10}) (Exp / %{11}) + ReadCmd <- READ (NAME / %{12}) + WriteCmd <- WRITE (Exp / %{13}) + Exp <- SimpleExp ((LESS / EQUAL) (SimpleExp / %{14}) / '') + SimpleExp <- Term ((ADD / SUB) (Term / %{15}))* + Term <- Factor ((MUL / DIV) (Factor / %{16}))* + Factor <- OPENPAR (Exp / %{17}) (CLOSEPAR / %{18}) / NUMBER / NAME + ADD <- Sp '+' + ASSIGNMENT <- Sp ':=' + CLOSEPAR <- Sp ')' + DIV <- Sp '/' + IF <- Sp 'if' + ELSE <- Sp 'else' + END <- Sp 'end' + EQUAL <- Sp '=' + LESS <- Sp '<' + MUL <- Sp '*' + NAME <- !RESERVED Sp [a-z]+ + NUMBER <- Sp [0-9]+ + OPENPAR <- Sp '(' + READ <- Sp 'read' + REPEAT <- Sp 'repeat' + SEMICOLON <- Sp ';' + SUB <- Sp '-' + THEN <- Sp 'then' + UNTIL <- Sp 'until' + WRITE <- Sp 'write' + RESERVED <- (IF / ELSE / END / READ / REPEAT / THEN / UNTIL / WRITE) ![a-z]+ + Sp <- (%s / %nl)* +]], terror) + +s = [[ +n := 5;]] +assert(g:match(s) == #s + 1) + +s = [[ +n := 5; +f := 1; +repeat + f := f * n; + n := n - 1; +until (n < 1); +write f;]] +assert(g:match(s) == #s + 1) + +-- a ';' is missing in 'read a' +s = [[ +read a]] +assert(g:match(s) == terror['cmdSeq']) + + +-- a ';' is missing in 'n := n - 1' +s = [[ +n := 5; +f := 1; +repeat + f := f * n; + n := n - 1 +until (n < 1); +write f;]] +assert(g:match(s) == terror['cmdSeq']) + + +-- IF expression +s = [[ +if a then a := a + 1; end;]] +assert(g:match(s) == #s + 1) + +-- IF expression +s = [[ +if a then a := a + 1; else write 2; end;]] +assert(g:match(s) == #s + 1) + +-- Error in expression of 'if'. 'A' is not a valida name +s = [[ +if A then a := a + 1; else write 2; end;]] +assert(g:match(s) == terror['ifExp']) + +-- Error matching the 'then' keyword +s = [[ +if a a := a + 1; else write 2; end;]] +assert(g:match(s) == terror['ifThen']) + +-- Error matching the CmdSeq inside of 'then' branch +s = [[ +if a then 3 := 2; else write 2; end;]] +assert(g:match(s) == terror['ifThenCmdSeq']) + +-- Error matching the CmdSeq inside of 'else' branch +s = [[ +if a then b := 2; else A := 2; end;]] +assert(g:match(s) == terror['ifElseCmdSeq']) + +-- Error matching 'end' of 'if' +s = [[ +if a then b := 2; else a := 2; 77;]] +assert(g:match(s) == terror['ifEnd']) + +-- Error matching the CmdSeq of 'repeat' +s = [[repeat + F := f * n; + n := n - 1; +until (n < 1);]] +assert(g:match(s) == terror['repeatCmdSeq']) + +-- Error matching 'until' +s = [[repeat + f := f * n; + n := n - 1; +88 (n < 1);]] +assert(g:match(s) == terror['repeatUntil']) + +-- Error matching expression of 'until' +s = [[repeat + f := f * n; + n := n - 1; +until ; (n < 1);]] +assert(g:match(s) == terror['repeatExp']) + +-- Error matching ':=' +s = [[ +f = f * n;]] +assert(g:match(s) == terror['assignOp']) + +-- Error matching expression of assignment +s = [[ +f := A * n;]] +assert(g:match(s) == terror['assignExp']) + +-- Error matching 'name' +s = [[ +read 2;]] +assert(g:match(s) == terror['readName']) + +-- Error matching expression after 'write' +s = [[ +write [a] := 2;]] +assert(g:match(s) == terror['writeExp']) + +-- Error matching 'SimpleExp' +s = [[ +a := a < A;]] +assert(g:match(s) == terror['simpleExp']) + +-- Error matching 'Term' +s = [[ +a := a + A;]] +assert(g:match(s) == terror['term']) + +-- Error matching 'Factor' +s = [[ +a := a * A;]] +assert(g:match(s) == terror['factor']) + +-- Error matching expression after '(' +s = [[ +a := (A);]] +assert(g:match(s) == terror['openParExp']) + +-- Error matching ')' +s = [[ +a := (a];]] +assert(g:match(s) == terror['closePar']) + +-- Error undefined +s = [[ +A := a;]] +assert(g:match(s) == terror['undefined']) + + +print("+") + + +p = m.Rec("a", "b", 3) +assert(p:match("a") == 2) +checklabeq({nil, 0, "b"}, p:match("b")) +checklabeq({nil, 0, "c"}, p:match("c")) + +p = m.Rec(m.T(3), "b", 1) +checklabeq({nil, 3, "a"}, p:match("a")) +checklabeq({nil, 3, "b"}, p:match("b")) + +p = m.Rec(m.T(3), "b", 3) +checklabeq({nil, 0, "a"}, p:match("a")) +assert(p:match("b") == 2) + +--[[ +S -> (A //{128} (!c .)*) C +A -> a*b / %128 +C -> c+ +]] +g = m.P{ + "S", + S = m.Rec(m.V"A", (-m.P"c" * m.P(1))^0, 128) * m.V"C", + A = m.P"a"^0 * "b" + m.T(128), + C = m.P"c"^1, +} + +assert(g:match("abc") == 4) +assert(g:match("aabc") == 5) +assert(g:match("aadc") == 5) +assert(g:match("dc") == 3) +checklabeq({nil, 0, "bc"}, g:match("bbc")) +assert(g:match("xxc") == 4) +assert(g:match("c") == 2) +checklabeq({nil, 0, ""}, g:match("fail")) +checklabeq({nil, 0, ""}, g:match("aaxx")) + + +--[[ +S -> (A //{99} (!c .)*) C +A -> a+ (b / ^99) +C -> c+ +]] +g = m.P{ + "S", + S = m.Rec(m.V"A", (-m.P"c" * m.P(1))^0, 99) * m.V"C", + A = m.P"a"^1 * ("b" + m.T(99)), + C = m.P"c"^1, +} + +assert(g:match("abc") == 4) +assert(g:match("aabc") == 5) +assert(g:match("aadc") == 5) +checklabeq({nil, 0, "bc"}, g:match("bc")) +checklabeq({nil, 0, "bbc"}, g:match("bbc")) +checklabeq({nil, 0, "b"}, g:match("abb")) +checklabeq({nil, 0, ""}, g:match("axx")) +assert(g:match("accc") == 5) +assert(g:match("axxc") == 5) +checklabeq({nil, 0, "c"}, g:match("c")) +checklabeq({nil, 0, "fail"}, g:match("fail")) + + + +-- Matthew's recovery example +lpeg = m + +local R, S, P, V = lpeg.R, lpeg.S, lpeg.P, lpeg.V +local C, Cc, Ct, Cmt = lpeg.C, lpeg.Cc, lpeg.Ct, lpeg.Cmt +local T, Lc = lpeg.T, lpeg.Lc + +local labels = { + {"NoExp", "no expression found"}, + {"Extra", "extra characters found after the expression"}, + {"ExpTerm", "expected a term after the operator"}, + {"ExpExp", "expected an expression after the parenthesis"}, + {"MisClose", "missing a closing ')' after the expression"}, +} + +local function labelindex(labname) + for i, elem in ipairs(labels) do + if elem[1] == labname then + return i + end + end + error("could not find label: " .. labname) +end + +local errors = {} + +local function expect(patt, labname) + local i = labelindex(labname) + function recorderror(input, pos) + table.insert(errors, {i, pos}) + return true + end + return patt + Cmt("", recorderror) * T(i) +end + +local num = R("09")^1 / tonumber +local op = S("+-*/") + +local function compute(tokens) + local result = tokens[1] + for i = 2, #tokens, 2 do + if tokens[i] == '+' then + result = result + tokens[i+1] + elseif tokens[i] == '-' then + result = result - tokens[i+1] + elseif tokens[i] == '*' then + result = result * tokens[i+1] + elseif tokens[i] == '/' then + result = result / tokens[i+1] + else + error('unknown operation: ' .. tokens[i]) + end + end + return result +end + +local g = P { + "Exp", + Exp = Ct(V"Term" * (C(op) * V"OpRecov")^0) / compute; + OpRecov = m.Rec(V"Operand", Cc(0), labelindex("ExpTerm")); + Operand = expect(V"Term", "ExpTerm"); + Term = num + V"Group"; + Group = "(" * V"InnerExp" * m.Rec(expect(")", "MisClose"), P"", labelindex("MisClose")); + InnerExp = m.Rec(expect(V"Exp", "ExpExp"), (P(1) - ")")^0 * Cc(0), labelindex("ExpExp")); +} + +g = expect(g, "NoExp") * expect(-P(1), "Extra") + +local function eval(input) + local result, label, suffix = g:match(input) + if #errors == 0 then + return result + else + local out = {} + for i, err in ipairs(errors) do + local pos = err[2] + local msg = labels[err[1]][2] + table.insert(out, "syntax error: " .. msg .. " (at index " .. pos .. ")") + end + errors = {} + return nil, table.concat(out, "\n") + end +end + +print(eval "98-76*(54/32)") +--> 37.125 + +print(eval "(1+1-1*2/2") +--> syntax error: missing a closing ')' after the expression (at index 11) + +print(eval "(1+)-1*(2/2)") +--> syntax error: expected a term after the operator (at index 4) + +print(eval "(1+1)-1*(/2)") +--> syntax error: expected an expression after the parenthesis (at index 10) + +print(eval "1+(1-(1*2))/2x") +--> syntax error: extra chracters found after the expression (at index 14) + +print(eval "-1+(1-(1*2))/2") +--> syntax error: no expression found (at index 1) + +print(eval "(1+1-1*(2/2+)-():") +--> syntax error: expected a term after the operator (at index 13) +--> syntax error: expected an expression after the parenthesis (at index 16) +--> syntax error: missing a closing ')' after the expression (at index 17) +--> syntax error: extra characters found after the expression (at index + + +print("+") + +local g = m.P{ + "S", + S = V"End" + V'A' * V'S', + A = P'a' + T(1), + End = P"." * (-P(1) + T(2)), +} + +assert(g:match("a.") == 3) +assert(g:match("aa.") == 4) +assert(g:match(".") == 2) +checklabeq({nil, 1, "ba."}, g:match("ba.")) +checklabeq({nil, 1, "ba."}, g:match("aba.")) +checklabeq({nil, 1, "cba."}, g:match("cba.")) +checklabeq({nil, 2, "a"}, g:match("a.a")) + + +local g2 = m.P{ + "S", + S = m.Rec(g, V"B", 1), + B = P'b'^1 + T(3) +} + +assert(g2:match("a.") == 3) +assert(g2:match("aa.") == 4) +assert(g2:match(".") == 2) +assert(g2:match("ba.") == 4) +assert(g2:match("aba.") == 5) +checklabeq({nil, 3, "cba."}, g2:match("cba.")) +checklabeq({nil, 2, "a"}, g2:match("a.a")) + +local g3 = m.P{ + "S", + S = m.Rec(g2, V"C", 2, 3), + C = P'c'^1 + T(4) +} + +assert(g3:match("a.") == 3) +assert(g3:match("aa.") == 4) +assert(g3:match(".") == 2) +assert(g3:match("ba.") == 4) +assert(g3:match("aba.") == 5) +assert(g3:match("cba.") == 5) +checklabeq({nil, 4, "a"}, g3:match("a.a")) +checklabeq({nil, 4, "dc"}, g3:match("dc")) +checklabeq({nil, 4, "d"}, g3:match(".d")) + + +-- testing more captures +local g = re.compile[[ + S <- ( %s* &. {A} )* + A <- [0-9]+ / %{5} +]] + +checkeq({"523", "624", "346", "888"} , {g:match("523 624 346\n888")}) +checkeq({nil, 5, "a 123"}, {g:match("44 a 123")}) + +local g2 = m.Rec(g, ((-m.R("09") * m.P(1))^0) / "58", 5) + +checkeq({"523", "624", "346", "888"} , {g2:match("523 624 346\n888")}) +checkeq({"44", "a ", "58", "123"}, {g2:match("44 a 123")}) + + +local g = re.compile[[ + S <- ( %s* &. A )* + A <- {[0-9]+} / %{5} +]] + +checkeq({"523", "624", "346", "888"} , {g:match("523 624 346\n888")}) +checkeq({nil, 5, "a 123"}, {g:match("44 a 123")}) + +local g2 = m.Rec(g, ((-m.R("09") * m.P(1))^0) / "58", 5) + +checkeq({"523", "624", "346", "888"} , {g2:match("523 624 346\n888")}) +checkeq({"44", "58", "123"}, {g2:match("44 a 123")}) + + +local R, S, P, V = lpeg.R, lpeg.S, lpeg.P, lpeg.V +local C, Cc, Ct, Cmt = lpeg.C, lpeg.Cc, lpeg.Ct, lpeg.Cmt +local T, Lc, Rec = lpeg.T, lpeg.Lc, lpeg.Rec + +local labels = { + {"NoExp", "no expression found"}, + {"Extra", "extra characters found after the expression"}, + {"ExpTerm", "expected a term after the operator"}, + {"ExpExp", "expected an expression after the parenthesis"}, + {"MisClose", "missing a closing ')' after the expression"}, +} + +local function labelindex(labname) + for i, elem in ipairs(labels) do + if elem[1] == labname then + return i + end + end + error("could not find label: " .. labname) +end + +local errors = {} + +local function expect(patt, labname, recpatt) + local i = labelindex(labname) + function recorderror(input, pos) + table.insert(errors, {i, pos}) + return true + end + if not recpatt then recpatt = P"" end + --return Rec(patt, Cmt("", recorderror) * recpatt) + return patt + T(i) +end + +local num = R("09")^1 / tonumber +local op = S("+-*/") + +local function compute(tokens) + local result = tokens[1] + for i = 2, #tokens, 2 do + if tokens[i] == '+' then + result = result + tokens[i+1] + elseif tokens[i] == '-' then + result = result - tokens[i+1] + elseif tokens[i] == '*' then + result = result * tokens[i+1] + elseif tokens[i] == '/' then + result = result / tokens[i+1] + else + error('unknown operation: ' .. tokens[i]) + end + end + return result +end + + +local g = P { +"Exp", +Exp = Ct(V"Term" * (C(op) * V"Operand")^0) / compute, +Operand = expect(V"Term", "ExpTerm"), +Term = num, +} +local rg = Rec(g, Cc(3), labelindex("ExpTerm")) + +local function eval(input) + local result, label, suffix = rg:match(input) + if #errors == 0 then + return result + else + local out = {} + for i, err in ipairs(errors) do + local pos = err[2] + local msg = labels[err[1]][2] + table.insert(out, "syntax error: " .. msg .. " (at index " .. pos .. ")") + end + errors = {} + return nil, table.concat(out, "\n") + end +end + +assert(eval("98-76*54/32") == 37.125) +--> 37.125 + +assert(eval("1+") == 4) +--> syntax error: expected a term after the operator (at index 3) + + +print("OK") diff --git a/06/lpeglabel/testrelabelparser.lua b/06/lpeglabel/testrelabelparser.lua new file mode 100644 index 0000000..5a43621 --- /dev/null +++ b/06/lpeglabel/testrelabelparser.lua @@ -0,0 +1,549 @@ +local re = require 'relabel' + +function testerror(repatt, msg) + msg = msg:match("^%s*(.-)%s*$") -- trim + local ok, err = pcall(function () re.compile(repatt) end) + assert(not ok) + if msg:match("^[^\n]*\n(.-)$") then + -- expecting a syntax error + err = err:match("^[^\n]*\n(.-)$") -- remove first line (filename) + err = err:gsub("[ \t]*\n", "\n") -- remove trailing spaces + -- if err ~= msg then + -- print(#err, #msg) + -- print('--') + -- print(err) + -- print('--') + -- print(msg) + -- print('--') + -- end + assert(err == msg) + else + -- expecting a non-syntax error + assert(err:match(msg)) + end +end + +-- testing NoPatt + +testerror([[~]], [[ +L1:C1: no pattern found +~ +^ +]]) + +testerror([[???]], [[ +L1:C1: no pattern found +??? +^ +]]) + +-- testing ExtraChars + +testerror([['p'~]], [[ +L1:C4: unexpected characters after the pattern +'p'~ + ^ +]]) + +testerror([['p'?$?]], [[ +L1:C5: unexpected characters after the pattern +'p'?$? + ^ +]]) + +-- testing ExpPatt1 + +testerror([['p' //{1}]], [[ +L1:C10: expected a pattern after '/' or '//{...}' +'p' //{1} + ^ +]]) + +testerror([['p' //{1} //{2} 'q']], [[ +L1:C10: expected a pattern after '/' or '//{...}' +'p' //{1} //{2} 'q' + ^ +]]) + +testerror([['p' /]], [[ +L1:C6: expected a pattern after '/' or '//{...}' +'p' / + ^ +]]) + +testerror([['p' / / 'q']], [[ +L1:C6: expected a pattern after '/' or '//{...}' +'p' / / 'q' + ^ +]]) + +-- testing ExpPatt2 + +testerror([[&]], [[ +L1:C2: expected a pattern after '&' +& + ^ +]]) + +testerror([[& / 'p']], [[ +L1:C2: expected a pattern after '&' +& / 'p' + ^ +]]) + +testerror([['p' &]], [[ +L1:C6: expected a pattern after '&' +'p' & + ^ +]]) + +testerror([['p' / & / 'q']], [[ +L1:C8: expected a pattern after '&' +'p' / & / 'q' + ^ +]]) + +testerror([[&&]], [[ +L1:C3: expected a pattern after '&' +&& + ^ +]]) + +testerror([[!&]], [[ +L1:C3: expected a pattern after '&' +!& + ^ +]]) + +-- testing ExpPatt3 + +testerror([[!]], [[ +L1:C2: expected a pattern after '!' +! + ^ +]]) + +testerror([[! / 'p']], [[ +L1:C2: expected a pattern after '!' +! / 'p' + ^ +]]) + +testerror([['p' !]], [[ +L1:C6: expected a pattern after '!' +'p' ! + ^ +]]) + +testerror([['p' / ! / 'q']], [[ +L1:C8: expected a pattern after '!' +'p' / ! / 'q' + ^ +]]) + +testerror([[!!]], [[ +L1:C3: expected a pattern after '!' +!! + ^ +]]) + +testerror([[&!]], [[ +L1:C3: expected a pattern after '!' +&! + ^ +]]) + +-- testing ExpPatt4 + +testerror([[()]], [[ +L1:C2: expected a pattern after '(' +() + ^ +]]) + +testerror([[($$$)]], [[ +L1:C2: expected a pattern after '(' +($$$) + ^ +]]) + +-- testing ExpPatt5 + +testerror([[{: *** :}]], [[ +L1:C3: expected a pattern after ':' +{: *** :} + ^ +]]) + +testerror([[{:group: *** :}]], [[ +L1:C9: expected a pattern after ':' +{:group: *** :} + ^ +]]) + +testerror([[x <- {:x:}]], [[ +L1:C10: expected a pattern after ':' +x <- {:x:} + ^ +]]) + +-- testing ExpPatt6 + +testerror([[{~~}]], [[ +L1:C3: expected a pattern after '{~' +{~~} + ^ +]]) + +testerror([[{ {~ } ~}]], [[ +L1:C5: expected a pattern after '{~' +{ {~ } ~} + ^ +]]) + +testerror([[{~ ^_^ ~}]], [[ +L1:C3: expected a pattern after '{~' +{~ ^_^ ~} + ^ +]]) + +-- testing ExpPatt7 + +testerror([[{||}]], [[ +L1:C3: expected a pattern after '{|' +{||} + ^ +]]) + +testerror([[{|@|}]], [[ +L1:C3: expected a pattern after '{|' +{|@|} + ^ +]]) + +-- testing ExpPatt8 + +testerror([[S <-]], [[ +L1:C5: expected a pattern after '<-' +S <- + ^ +]]) + +testerror([[S <- 'p' T <-]], [[ +L1:C14: expected a pattern after '<-' +S <- 'p' T <- + ^ +]]) + +-- testing ExpPattOrClose + +testerror([[{0}]], [[ +L1:C2: expected a pattern or closing '}' after '{' +{0} + ^ +]]) + +testerror([[{ :'p': }]], [[ +L1:C2: expected a pattern or closing '}' after '{' +{ :'p': } + ^ +]]) + +-- testing ExpNum + +testerror([['p' ^ n]], [[ +L1:C6: expected a number after '^', '+' or '-' (no space) +'p' ^ n + ^ +]]) + +testerror([['p'^+(+1)]], [[ +L1:C5: expected a number after '^', '+' or '-' (no space) +'p'^+(+1) + ^ +]]) + +testerror([['p'^-/'q']], [[ +L1:C5: expected a number after '^', '+' or '-' (no space) +'p'^-/'q' + ^ +]]) + +-- testing ExpCap + +testerror([['p' -> {]], [[ +L1:C7: expected a string, number, '{}' or name after '->' +'p' -> { + ^ +]]) + +testerror([['p' -> {'q'}]], [[ +L1:C7: expected a string, number, '{}' or name after '->' +'p' -> {'q'} + ^ +]]) + +testerror([['p' -> / 'q']], [[ +L1:C7: expected a string, number, '{}' or name after '->' +'p' -> / 'q' + ^ +]]) + +testerror([['p' -> [0-9] ]], [[ +L1:C7: expected a string, number, '{}' or name after '->' +'p' -> [0-9] + ^ +]]) + +-- testing ExpName1 + +testerror([['p' =>]], [[ +L1:C7: expected the name of a rule after '=>' +'p' => + ^ +]]) + +testerror([['p' => 'q']], [[ +L1:C7: expected the name of a rule after '=>' +'p' => 'q' + ^ +]]) + +-- testing ExpName2 + +testerror([['<' {:tag: [a-z]+ :} '>' '<' = '>']], [[ +L1:C31: expected the name of a rule after '=' (no space) +'<' {:tag: [a-z]+ :} '>' '<' = '>' + ^ +]]) + +testerror([['<' {:tag: [a-z]+ :} '>' '<' = tag '>']], [[ +L1:C31: expected the name of a rule after '=' (no space) +'<' {:tag: [a-z]+ :} '>' '<' = tag '>' + ^ +]]) + +-- testing ExpName3 + +testerror([[<>]], [[ +L1:C2: expected the name of a rule after '<' (no space) +<> + ^ +]]) + +testerror([[<123>]], [[ +L1:C2: expected the name of a rule after '<' (no space) +<123> + ^ +]]) + +testerror([[< hello >]], [[ +L1:C2: expected the name of a rule after '<' (no space) +< hello > + ^ +]]) + +testerror([[<>]], [[ +L1:C2: expected the name of a rule after '<' (no space) +<> + ^ +]]) + +-- testing ExpLab1 + +testerror([['p' //{} 'q']], [[ +L1:C8: expected at least one label after '{' +'p' //{} 'q' + ^ +]]) + +testerror([[%{ 'label' }]], [[ +L1:C3: expected at least one label after '{' +%{ 'label' } + ^ +]]) + +-- testing ExpLab2 + +testerror([['p' //{1,2,3,} 'q']], [[ +L1:C14: expected a label after the comma +'p' //{1,2,3,} 'q' + ^ +]]) + +-- testing ExpNameOrLab + +testerror([[% s]], [[ +L1:C2: expected a name or label after '%' (no space) +% s + ^ +]]) + +testerror([[% {1}]], [[ +L1:C2: expected a name or label after '%' (no space) +% {1} + ^ +]]) + +-- testing ExpItem + +testerror([[ +"p" [ +abc +] "q" +]], [[ +L1:C6: expected at least one item after '[' or '^' +"p" [ + ^ +]]) + +-- testing MisClose1 + +testerror([[('p' ('q' / 'r')]], [[ +L1:C17: missing closing ')' +('p' ('q' / 'r') + ^ +]]) + +-- testing MisClose2 + +-- two errors are reported due to the ignore strategy +testerror([[{: group: 'p' :}]], [[ +L1:C9: missing closing ':}' +{: group: 'p' :} + ^ +]]) + +testerror([[S <- {: 'p' T <- 'q']], [[ +L1:C12: missing closing ':}' +S <- {: 'p' T <- 'q' + ^ +]]) + +-- testing MisClose3 + +testerror([['p' {~ ('q' 'r') / 's']], [[ +L1:C23: missing closing '~}' +'p' {~ ('q' 'r') / 's' + ^ +]]) + +-- testing MisClose4 + +-- two errors are reported due to the ignore strategy +testerror([['p' {| 'q' / 'r' }]], [[ +L1:C17: missing closing '|}' +'p' {| 'q' / 'r' } + ^ +]]) + +-- testing MisClose5 + +testerror([[{ 'p' ]], [[ +L1:C6: missing closing '}' +{ 'p' + ^ +]]) + +-- testing MisClose6 + +testerror([[' +]], [[ +L1:C8: missing closing '>' + + ^ +]]) + +-- testing MisClose7 + +testerror([['{' %{ a, b '}']], [[ +L1:C9: missing closing '}' +'{' %{ a, b '}' + ^ +]]) + +-- testing MisClose8 + +testerror([[[]], [[ +L1:C2: missing closing ']' +[ + ^ +]]) + +testerror([[[^]], [[ +L1:C3: missing closing ']' +[^ + ^ +]]) + +testerror([[[] ]], [[ +L1:C4: missing closing ']' +[] + ^ +]]) + +testerror([[[^] ]], [[ +L1:C6: missing closing ']' +[^] + ^ +]]) + +testerror([[[_-___-_|]], [[ +L1:C10: missing closing ']' +[_-___-_| + ^ +]]) + +-- testing MisTerm1 + +testerror([['That is the question...]], [[ +L1:C25: missing terminating single quote +'That is the question... + ^ +]]) + +-- testing MisTerm2 + +testerror([[Q <- "To be or not to be...]], [[ +L1:C28: missing terminating double quote +Q <- "To be or not to be... + ^ +]]) + +-- testing non-syntax errors + +testerror([[ + A <- %nosuch %def + A <- 'A again' + A <- 'and again' +]], [[ +name 'nosuch' undefined +]]) + +testerror([[names not in grammar]], [[ +rule 'names' used outside a grammar +]]) + +testerror([[ + A <- %nosuch %def + A <- 'A again' + A <- 'and again' +]], [[ +name 'nosuch' undefined +]]) + +-- the non-syntax error should not be reported +-- since there is a syntax error +testerror([[ A <- %nosuch ('error' ]], [[ +L1:C23: missing closing ')' + A <- %nosuch ('error' + ^ +]]) + + +print 'OK' diff --git a/06/lua-5.4.6/.gitignore b/06/lua-5.4.6/.gitignore new file mode 100644 index 0000000..d27f61e --- /dev/null +++ b/06/lua-5.4.6/.gitignore @@ -0,0 +1,5 @@ +**/*.o +**/*.d +src/liblua.a +src/lua +src/luac \ No newline at end of file diff --git a/06/lua-5.4.6/Makefile b/06/lua-5.4.6/Makefile new file mode 100644 index 0000000..03cca3b --- /dev/null +++ b/06/lua-5.4.6/Makefile @@ -0,0 +1,106 @@ +# Makefile for installing Lua +# See doc/readme.html for installation and customization instructions. + +# == CHANGE THE SETTINGS BELOW TO SUIT YOUR ENVIRONMENT ======================= + +# Your platform. See PLATS for possible values. +PLAT= generic + +# Where to install. The installation starts in the src and doc directories, +# so take care if INSTALL_TOP is not an absolute path. See the local target. +# You may want to make INSTALL_LMOD and INSTALL_CMOD consistent with +# LUA_ROOT, LUA_LDIR, and LUA_CDIR in luaconf.h. +INSTALL_TOP= ../../lua-bootstrap +INSTALL_BIN= $(INSTALL_TOP)/bin +INSTALL_INC= $(INSTALL_TOP)/include +INSTALL_LIB= $(INSTALL_TOP)/lib +INSTALL_MAN= $(INSTALL_TOP)/man/man1 +INSTALL_LMOD= $(INSTALL_TOP)/share/lua/$V +INSTALL_CMOD= $(INSTALL_TOP)/lib/lua/$V + +# How to install. If your install program does not support "-p", then +# you may have to run ranlib on the installed liblua.a. +INSTALL= install -p +INSTALL_EXEC= $(INSTALL) -m 0755 +INSTALL_DATA= $(INSTALL) -m 0644 +# +# If you don't have "install" you can use "cp" instead. +# INSTALL= cp -p +# INSTALL_EXEC= $(INSTALL) +# INSTALL_DATA= $(INSTALL) + +# Other utilities. +MKDIR= mkdir -p +RM= rm -f + +# == END OF USER SETTINGS -- NO NEED TO CHANGE ANYTHING BELOW THIS LINE ======= + +# Convenience platforms targets. +PLATS= guess aix bsd c89 freebsd generic ios linux linux-readline macosx mingw posix solaris + +# What to install. +TO_BIN= lua luac +TO_INC= lua.h luaconf.h lualib.h lauxlib.h lua.hpp +TO_LIB= liblua.a +TO_MAN= lua.1 luac.1 + +# Lua version and release. +V= 5.4 +R= $V.6 + +# Targets start here. +all: $(PLAT) + +$(PLATS) help test clean: + @cd src && $(MAKE) $@ + +install: dummy + cd src && $(MKDIR) $(INSTALL_BIN) $(INSTALL_INC) $(INSTALL_LIB) $(INSTALL_MAN) $(INSTALL_LMOD) $(INSTALL_CMOD) + cd src && $(INSTALL_EXEC) $(TO_BIN) $(INSTALL_BIN) + cd src && $(INSTALL_DATA) $(TO_INC) $(INSTALL_INC) + cd src && $(INSTALL_DATA) $(TO_LIB) $(INSTALL_LIB) + cd doc && $(INSTALL_DATA) $(TO_MAN) $(INSTALL_MAN) + +uninstall: + cd src && cd $(INSTALL_BIN) && $(RM) $(TO_BIN) + cd src && cd $(INSTALL_INC) && $(RM) $(TO_INC) + cd src && cd $(INSTALL_LIB) && $(RM) $(TO_LIB) + cd doc && cd $(INSTALL_MAN) && $(RM) $(TO_MAN) + +local: + $(MAKE) install INSTALL_TOP=../install + +# make may get confused with install/ if it does not support .PHONY. +dummy: + +# Echo config parameters. +echo: + @cd src && $(MAKE) -s echo + @echo "PLAT= $(PLAT)" + @echo "V= $V" + @echo "R= $R" + @echo "TO_BIN= $(TO_BIN)" + @echo "TO_INC= $(TO_INC)" + @echo "TO_LIB= $(TO_LIB)" + @echo "TO_MAN= $(TO_MAN)" + @echo "INSTALL_TOP= $(INSTALL_TOP)" + @echo "INSTALL_BIN= $(INSTALL_BIN)" + @echo "INSTALL_INC= $(INSTALL_INC)" + @echo "INSTALL_LIB= $(INSTALL_LIB)" + @echo "INSTALL_MAN= $(INSTALL_MAN)" + @echo "INSTALL_LMOD= $(INSTALL_LMOD)" + @echo "INSTALL_CMOD= $(INSTALL_CMOD)" + @echo "INSTALL_EXEC= $(INSTALL_EXEC)" + @echo "INSTALL_DATA= $(INSTALL_DATA)" + +# Echo pkg-config data. +pc: + @echo "version=$R" + @echo "prefix=$(INSTALL_TOP)" + @echo "libdir=$(INSTALL_LIB)" + @echo "includedir=$(INSTALL_INC)" + +# Targets that do not create files (not all makes understand .PHONY). +.PHONY: all $(PLATS) help test clean install uninstall local dummy echo pc + +# (end of Makefile) diff --git a/06/lua-5.4.6/README b/06/lua-5.4.6/README new file mode 100644 index 0000000..1ae9716 --- /dev/null +++ b/06/lua-5.4.6/README @@ -0,0 +1,6 @@ + +This is Lua 5.4.6, released on 02 May 2023. + +For installation instructions, license details, and +further information about Lua, see doc/readme.html. + diff --git a/06/lua-5.4.6/doc/contents.html b/06/lua-5.4.6/doc/contents.html new file mode 100644 index 0000000..1231e6d --- /dev/null +++ b/06/lua-5.4.6/doc/contents.html @@ -0,0 +1,678 @@ + + + +Lua 5.4 Reference Manual - contents + + + + + + + +

+Lua +Lua 5.4 Reference Manual +

+ +

+The reference manual is the official definition of the Lua language. +
+For a complete introduction to Lua programming, see the book +Programming in Lua. + +

+start +· +contents +· +index +· +other versions +
+ +

+ +Copyright © 2020–2023 Lua.org, PUC-Rio. +Freely available under the terms of the +Lua license. + + +

Contents

+ + +

Index

+ + + + + + + +
+

Lua functions

+

+basic
+_G
+_VERSION
+assert
+collectgarbage
+dofile
+error
+getmetatable
+ipairs
+load
+loadfile
+next
+pairs
+pcall
+print
+rawequal
+rawget
+rawlen
+rawset
+require
+select
+setmetatable
+tonumber
+tostring
+type
+warn
+xpcall
+ +

+coroutine
+coroutine.close
+coroutine.create
+coroutine.isyieldable
+coroutine.resume
+coroutine.running
+coroutine.status
+coroutine.wrap
+coroutine.yield
+ +

+debug
+debug.debug
+debug.gethook
+debug.getinfo
+debug.getlocal
+debug.getmetatable
+debug.getregistry
+debug.getupvalue
+debug.getuservalue
+debug.sethook
+debug.setlocal
+debug.setmetatable
+debug.setupvalue
+debug.setuservalue
+debug.traceback
+debug.upvalueid
+debug.upvaluejoin
+ +

+io
+io.close
+io.flush
+io.input
+io.lines
+io.open
+io.output
+io.popen
+io.read
+io.stderr
+io.stdin
+io.stdout
+io.tmpfile
+io.type
+io.write
+ +file:close
+file:flush
+file:lines
+file:read
+file:seek
+file:setvbuf
+file:write
+ +

 +

 

+

+math
+math.abs
+math.acos
+math.asin
+math.atan
+math.ceil
+math.cos
+math.deg
+math.exp
+math.floor
+math.fmod
+math.huge
+math.log
+math.max
+math.maxinteger
+math.min
+math.mininteger
+math.modf
+math.pi
+math.rad
+math.random
+math.randomseed
+math.sin
+math.sqrt
+math.tan
+math.tointeger
+math.type
+math.ult
+ +

+os
+os.clock
+os.date
+os.difftime
+os.execute
+os.exit
+os.getenv
+os.remove
+os.rename
+os.setlocale
+os.time
+os.tmpname
+ +

+package
+package.config
+package.cpath
+package.loaded
+package.loadlib
+package.path
+package.preload
+package.searchers
+package.searchpath
+ +

+string
+string.byte
+string.char
+string.dump
+string.find
+string.format
+string.gmatch
+string.gsub
+string.len
+string.lower
+string.match
+string.pack
+string.packsize
+string.rep
+string.reverse
+string.sub
+string.unpack
+string.upper
+ +

+table
+table.concat
+table.insert
+table.move
+table.pack
+table.remove
+table.sort
+table.unpack
+ +

+utf8
+utf8.char
+utf8.charpattern
+utf8.codepoint
+utf8.codes
+utf8.len
+utf8.offset
+ +

metamethods

+

+__add
+__band
+__bnot
+__bor
+__bxor
+__call
+__close
+__concat
+__div
+__eq
+__gc
+__idiv
+__index
+__le
+__len
+__lt
+__metatable
+__mod
+__mode
+__mul
+__name
+__newindex
+__pairs
+__pow
+__shl
+__shr
+__sub
+__tostring
+__unm
+ +

environment
variables

+

+LUA_CPATH
+LUA_CPATH_5_4
+LUA_INIT
+LUA_INIT_5_4
+LUA_PATH
+LUA_PATH_5_4
+ +

 +

C API

+

+lua_Alloc
+lua_CFunction
+lua_Debug
+lua_Hook
+lua_Integer
+lua_KContext
+lua_KFunction
+lua_Number
+lua_Reader
+lua_State
+lua_Unsigned
+lua_WarnFunction
+lua_Writer
+ +

+lua_absindex
+lua_arith
+lua_atpanic
+lua_call
+lua_callk
+lua_checkstack
+lua_close
+lua_closeslot
+lua_compare
+lua_concat
+lua_copy
+lua_createtable
+lua_dump
+lua_error
+lua_gc
+lua_getallocf
+lua_getextraspace
+lua_getfield
+lua_getglobal
+lua_gethook
+lua_gethookcount
+lua_gethookmask
+lua_geti
+lua_getinfo
+lua_getiuservalue
+lua_getlocal
+lua_getmetatable
+lua_getstack
+lua_gettable
+lua_gettop
+lua_getupvalue
+lua_insert
+lua_isboolean
+lua_iscfunction
+lua_isfunction
+lua_isinteger
+lua_islightuserdata
+lua_isnil
+lua_isnone
+lua_isnoneornil
+lua_isnumber
+lua_isstring
+lua_istable
+lua_isthread
+lua_isuserdata
+lua_isyieldable
+lua_len
+lua_load
+lua_newstate
+lua_newtable
+lua_newthread
+lua_newuserdatauv
+lua_next
+lua_numbertointeger
+lua_pcall
+lua_pcallk
+lua_pop
+lua_pushboolean
+lua_pushcclosure
+lua_pushcfunction
+lua_pushfstring
+lua_pushglobaltable
+lua_pushinteger
+lua_pushlightuserdata
+lua_pushliteral
+lua_pushlstring
+lua_pushnil
+lua_pushnumber
+lua_pushstring
+lua_pushthread
+lua_pushvalue
+lua_pushvfstring
+lua_rawequal
+lua_rawget
+lua_rawgeti
+lua_rawgetp
+lua_rawlen
+lua_rawset
+lua_rawseti
+lua_rawsetp
+lua_register
+lua_remove
+lua_replace
+lua_resetthread
+lua_resume
+lua_rotate
+lua_setallocf
+lua_setfield
+lua_setglobal
+lua_sethook
+lua_seti
+lua_setiuservalue
+lua_setlocal
+lua_setmetatable
+lua_settable
+lua_settop
+lua_setupvalue
+lua_setwarnf
+lua_status
+lua_stringtonumber
+lua_toboolean
+lua_tocfunction
+lua_toclose
+lua_tointeger
+lua_tointegerx
+lua_tolstring
+lua_tonumber
+lua_tonumberx
+lua_topointer
+lua_tostring
+lua_tothread
+lua_touserdata
+lua_type
+lua_typename
+lua_upvalueid
+lua_upvalueindex
+lua_upvaluejoin
+lua_version
+lua_warning
+lua_xmove
+lua_yield
+lua_yieldk
+ +

 +

auxiliary library

+

+luaL_Buffer
+luaL_Reg
+luaL_Stream
+ +

+luaL_addchar
+luaL_addgsub
+luaL_addlstring
+luaL_addsize
+luaL_addstring
+luaL_addvalue
+luaL_argcheck
+luaL_argerror
+luaL_argexpected
+luaL_buffaddr
+luaL_buffinit
+luaL_buffinitsize
+luaL_bufflen
+luaL_buffsub
+luaL_callmeta
+luaL_checkany
+luaL_checkinteger
+luaL_checklstring
+luaL_checknumber
+luaL_checkoption
+luaL_checkstack
+luaL_checkstring
+luaL_checktype
+luaL_checkudata
+luaL_checkversion
+luaL_dofile
+luaL_dostring
+luaL_error
+luaL_execresult
+luaL_fileresult
+luaL_getmetafield
+luaL_getmetatable
+luaL_getsubtable
+luaL_gsub
+luaL_len
+luaL_loadbuffer
+luaL_loadbufferx
+luaL_loadfile
+luaL_loadfilex
+luaL_loadstring
+luaL_newlib
+luaL_newlibtable
+luaL_newmetatable
+luaL_newstate
+luaL_openlibs
+luaL_opt
+luaL_optinteger
+luaL_optlstring
+luaL_optnumber
+luaL_optstring
+luaL_prepbuffer
+luaL_prepbuffsize
+luaL_pushfail
+luaL_pushresult
+luaL_pushresultsize
+luaL_ref
+luaL_requiref
+luaL_setfuncs
+luaL_setmetatable
+luaL_testudata
+luaL_tolstring
+luaL_traceback
+luaL_typeerror
+luaL_typename
+luaL_unref
+luaL_where
+ +

standard library

+

+luaopen_base
+luaopen_coroutine
+luaopen_debug
+luaopen_io
+luaopen_math
+luaopen_os
+luaopen_package
+luaopen_string
+luaopen_table
+luaopen_utf8
+ +

constants

+

+LUA_ERRERR
+LUA_ERRFILE
+LUA_ERRMEM
+LUA_ERRRUN
+LUA_ERRSYNTAX
+LUA_HOOKCALL
+LUA_HOOKCOUNT
+LUA_HOOKLINE
+LUA_HOOKRET
+LUA_HOOKTAILCALL
+LUA_LOADED_TABLE
+LUA_MASKCALL
+LUA_MASKCOUNT
+LUA_MASKLINE
+LUA_MASKRET
+LUA_MAXINTEGER
+LUA_MININTEGER
+LUA_MINSTACK
+LUA_MULTRET
+LUA_NOREF
+LUA_OK
+LUA_OPADD
+LUA_OPBAND
+LUA_OPBNOT
+LUA_OPBOR
+LUA_OPBXOR
+LUA_OPDIV
+LUA_OPEQ
+LUA_OPIDIV
+LUA_OPLE
+LUA_OPLT
+LUA_OPMOD
+LUA_OPMUL
+LUA_OPPOW
+LUA_OPSHL
+LUA_OPSHR
+LUA_OPSUB
+LUA_OPUNM
+LUA_PRELOAD_TABLE
+LUA_REFNIL
+LUA_REGISTRYINDEX
+LUA_RIDX_GLOBALS
+LUA_RIDX_MAINTHREAD
+LUA_TBOOLEAN
+LUA_TFUNCTION
+LUA_TLIGHTUSERDATA
+LUA_TNIL
+LUA_TNONE
+LUA_TNUMBER
+LUA_TSTRING
+LUA_TTABLE
+LUA_TTHREAD
+LUA_TUSERDATA
+LUA_USE_APICHECK
+LUA_YIELD
+LUAL_BUFFERSIZE
+ +

+ +

+Last update: +Sat Apr 1 17:57:05 UTC 2023 +

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+.SH DESCRIPTION +.B lua +is the standalone Lua interpreter. +It loads and executes Lua programs, +either in textual source form or +in precompiled binary form. +(Precompiled binaries are output by +.BR luac , +the Lua compiler.) +.B lua +can be used as a batch interpreter and also interactively. +.LP +After handling the +.IR options , +the Lua program in file +.I script +is loaded and executed. +The +.I args +are available to +.I script +as strings in a global table named +.B arg +and also as arguments to its main function. +When called without arguments, +.B lua +behaves as +.B "lua \-v \-i" +if the standard input is a terminal, +and as +.B "lua \-" +otherwise. +.LP +In interactive mode, +.B lua +prompts the user, +reads lines from the standard input, +and executes them as they are read. +If the line contains an expression, +then the line is evaluated and the result is printed. +If a line does not contain a complete statement, +then a secondary prompt is displayed and +lines are read until a complete statement is formed or +a syntax error is found. +.LP +Before handling command line options and scripts, +.B lua +checks the contents of the environment variables +.B LUA_INIT_5_4 +and +.BR LUA_INIT , +in that order. +If the contents are of the form +.RI '@ filename ', +then +.I filename +is executed. +Otherwise, the contents are assumed to be a Lua statement and is executed. +When +.B LUA_INIT_5_4 +is defined, +.B LUA_INIT +is ignored. +.SH OPTIONS +.TP +.BI \-e " stat" +execute statement +.IR stat . +.TP +.B \-i +enter interactive mode after executing +.IR script . +.TP +.BI \-l " mod" +require library +.I mod +into global +.IR mod . +.TP +.BI \-l " g=mod" +require library +.I mod +into global +.IR g . +.TP +.B \-v +show version information. +.TP +.B \-E +ignore environment variables. +.TP +.B \-W +turn warnings on. +.TP +.B \-\- +stop handling options. +.TP +.B \- +stop handling options and execute the standard input as a file. +.SH ENVIRONMENT VARIABLES +The following environment variables affect the execution of +.BR lua . +When defined, +the version-specific variants take priority +and the version-neutral variants are ignored. +.TP +.B LUA_INIT, LUA_INIT_5_4 +Code to be executed before command line options and scripts. +.TP +.B LUA_PATH, LUA_PATH_5_4 +Initial value of package.cpath, +the path used by require to search for Lua loaders. +.TP +.B LUA_CPATH, LUA_CPATH_5_4 +Initial value of package.cpath, +the path used by require to search for C loaders. +.SH EXIT STATUS +If a script calls os.exit, +then +.B lua +exits with the given exit status. +Otherwise, +.B lua +exits +with EXIT_SUCCESS (0 on POSIX systems) if there were no errors +and +with EXIT_FAILURE (1 on POSIX systems) if there were errors. +Errors raised in interactive mode do not cause exits. +.SH DIAGNOSTICS +Error messages should be self explanatory. +.SH "SEE ALSO" +.BR luac (1) +.br +The documentation at lua.org, +especially section 7 of the reference manual. +.SH AUTHORS +R. Ierusalimschy, +L. H. de Figueiredo, +W. Celes +.\" EOF diff --git a/06/lua-5.4.6/doc/lua.css b/06/lua-5.4.6/doc/lua.css new file mode 100644 index 0000000..cbd0799 --- /dev/null +++ b/06/lua-5.4.6/doc/lua.css @@ -0,0 +1,161 @@ +html { + background-color: #F8F8F8 ; +} + +body { + background-color: #FFFFFF ; + color: #000000 ; + font-family: Helvetica, Arial, sans-serif ; + text-align: justify ; + line-height: 1.25 ; + margin: 16px auto ; + padding: 32px ; + border: solid #ccc 1px ; + border-radius: 20px ; + max-width: 70em ; + width: 90% ; +} + +h1, h2, h3, h4 { + color: #000080 ; + font-family: Verdana, Geneva, sans-serif ; + font-weight: normal ; + font-style: normal ; + text-align: left ; +} + +h1 { + font-size: 28pt ; +} + +h1 img { + vertical-align: text-bottom ; +} + +h2:before { + content: "\2756" ; + padding-right: 0.5em ; +} + +a { + text-decoration: none ; +} + +a:link { + color: #000080 ; +} + +a:link:hover, a:visited:hover { + background-color: #D0D0FF ; + color: #000080 ; + border-radius: 4px ; +} + +a:link:active, a:visited:active { + color: #FF0000 ; +} + +div.menubar { + padding-bottom: 0.5em ; +} + +p.menubar { + margin-left: 2.5em ; +} + +.menubar a:hover { + margin: -3px -3px -3px -3px ; + padding: 3px 3px 3px 3px ; + border-radius: 4px ; +} + +:target { + background-color: #F0F0F0 ; + margin: -8px ; + padding: 8px ; + border-radius: 8px ; + outline: none ; +} + +hr { + display: none ; +} + +table hr { + background-color: #a0a0a0 ; + color: #a0a0a0 ; + border: 0 ; + height: 1px ; + display: block ; +} + +.footer { + color: gray ; + font-size: x-small ; + text-transform: lowercase ; +} + +input[type=text] { + border: solid #a0a0a0 2px ; + border-radius: 2em ; + background-image: url('images/search.png') ; + background-repeat: no-repeat ; + background-position: 4px center ; + padding-left: 20px ; + height: 2em ; +} + +pre.session { + background-color: #F8F8F8 ; + padding: 1em ; + border-radius: 8px ; +} + +table { + border: none ; + border-spacing: 0 ; + border-collapse: collapse ; +} + +td { + padding: 0 ; + margin: 0 ; +} + +td.gutter { + width: 4% ; +} + +table.columns td { + vertical-align: top ; + padding-bottom: 1em ; + text-align: justify ; + line-height: 1.25 ; +} + +table.book td { + vertical-align: top ; +} + +table.book td.cover { + padding-right: 1em ; +} + +table.book img { + border: solid #000080 1px ; +} + +table.book span { + font-size: small ; + text-align: left ; + display: block ; + margin-top: 0.25em ; +} + +p.logos a:link:hover, p.logos a:visited:hover { + background-color: inherit ; +} + +img { + background-color: white ; +} diff --git a/06/lua-5.4.6/doc/luac.1 b/06/lua-5.4.6/doc/luac.1 new file mode 100644 index 0000000..33a4ed0 --- /dev/null +++ b/06/lua-5.4.6/doc/luac.1 @@ -0,0 +1,118 @@ +.\" $Id: luac.man,v 1.29 2011/11/16 13:53:40 lhf Exp $ +.TH LUAC 1 "$Date: 2011/11/16 13:53:40 $" +.SH NAME +luac \- Lua compiler +.SH SYNOPSIS +.B luac +[ +.I options +] [ +.I filenames +] +.SH DESCRIPTION +.B luac +is the Lua compiler. +It translates programs written in the Lua programming language +into binary files containing precompiled chunks +that can be later loaded and executed. +.LP +The main advantages of precompiling chunks are: +faster loading, +protecting source code from accidental user changes, +and +off-line syntax checking. +Precompiling does not imply faster execution +because in Lua chunks are always compiled into bytecodes before being executed. +.B luac +simply allows those bytecodes to be saved in a file for later execution. +Precompiled chunks are not necessarily smaller than the corresponding source. +The main goal in precompiling is faster loading. +.LP +In the command line, +you can mix +text files containing Lua source and +binary files containing precompiled chunks. +.B luac +produces a single output file containing the combined bytecodes +for all files given. +Executing the combined file is equivalent to executing the given files. +By default, +the output file is named +.BR luac.out , +but you can change this with the +.B \-o +option. +.LP +Precompiled chunks are +.I not +portable across different architectures. +Moreover, +the internal format of precompiled chunks +is likely to change when a new version of Lua is released. +Make sure you save the source files of all Lua programs that you precompile. +.LP +.SH OPTIONS +.TP +.B \-l +produce a listing of the compiled bytecode for Lua's virtual machine. +Listing bytecodes is useful to learn about Lua's virtual machine. +If no files are given, then +.B luac +loads +.B luac.out +and lists its contents. +Use +.B \-l \-l +for a full listing. +.TP +.BI \-o " file" +output to +.IR file , +instead of the default +.BR luac.out . +(You can use +.B "'\-'" +for standard output, +but not on platforms that open standard output in text mode.) +The output file may be one of the given files because +all files are loaded before the output file is written. +Be careful not to overwrite precious files. +.TP +.B \-p +load files but do not generate any output file. +Used mainly for syntax checking and for testing precompiled chunks: +corrupted files will probably generate errors when loaded. +If no files are given, then +.B luac +loads +.B luac.out +and tests its contents. +No messages are displayed if the file loads without errors. +.TP +.B \-s +strip debug information before writing the output file. +This saves some space in very large chunks, +but if errors occur when running a stripped chunk, +then the error messages may not contain the full information they usually do. +In particular, +line numbers and names of local variables are lost. +.TP +.B \-v +show version information. +.TP +.B \-\- +stop handling options. +.TP +.B \- +stop handling options and process standard input. +.SH "SEE ALSO" +.BR lua (1) +.br +The documentation at lua.org. +.SH DIAGNOSTICS +Error messages should be self explanatory. +.SH AUTHORS +R. Ierusalimschy, +L. H. de Figueiredo, +W. Celes +.\" EOF diff --git a/06/lua-5.4.6/doc/manual.css b/06/lua-5.4.6/doc/manual.css new file mode 100644 index 0000000..aa0e677 --- /dev/null +++ b/06/lua-5.4.6/doc/manual.css @@ -0,0 +1,21 @@ +h3 code { + font-family: inherit ; + font-size: inherit ; +} + +pre, code { + font-size: 12pt ; +} + +span.apii { + color: gray ; + float: right ; + font-family: inherit ; + font-style: normal ; + font-size: small ; +} + +h2:before { + content: "" ; + padding-right: 0em ; +} diff --git a/06/lua-5.4.6/doc/manual.html b/06/lua-5.4.6/doc/manual.html new file mode 100644 index 0000000..0af688b --- /dev/null +++ b/06/lua-5.4.6/doc/manual.html @@ -0,0 +1,12046 @@ + + + +Lua 5.4 Reference Manual + + + + + + + +

+Lua +Lua 5.4 Reference Manual +

+ +

+by Roberto Ierusalimschy, Luiz Henrique de Figueiredo, Waldemar Celes + +

+ +Copyright © 2020–2023 Lua.org, PUC-Rio. +Freely available under the terms of the +Lua license. + + +

+contents +· +index +· +other versions +
+ + +

+ + + + + + +

1 – Introduction

+ +

+Lua is a powerful, efficient, lightweight, embeddable scripting language. +It supports procedural programming, +object-oriented programming, functional programming, +data-driven programming, and data description. + + +

+Lua combines simple procedural syntax with powerful data description +constructs based on associative arrays and extensible semantics. +Lua is dynamically typed, +runs by interpreting bytecode with a register-based +virtual machine, +and has automatic memory management with +a generational garbage collection, +making it ideal for configuration, scripting, +and rapid prototyping. + + +

+Lua is implemented as a library, written in clean C, +the common subset of standard C and C++. +The Lua distribution includes a host program called lua, +which uses the Lua library to offer a complete, +standalone Lua interpreter, +for interactive or batch use. +Lua is intended to be used both as a powerful, lightweight, +embeddable scripting language for any program that needs one, +and as a powerful but lightweight and efficient stand-alone language. + + +

+As an extension language, Lua has no notion of a "main" program: +it works embedded in a host client, +called the embedding program or simply the host. +(Frequently, this host is the stand-alone lua program.) +The host program can invoke functions to execute a piece of Lua code, +can write and read Lua variables, +and can register C functions to be called by Lua code. +Through the use of C functions, Lua can be augmented to cope with +a wide range of different domains, +thus creating customized programming languages sharing a syntactical framework. + + +

+Lua is free software, +and is provided as usual with no guarantees, +as stated in its license. +The implementation described in this manual is available +at Lua's official web site, www.lua.org. + + +

+Like any other reference manual, +this document is dry in places. +For a discussion of the decisions behind the design of Lua, +see the technical papers available at Lua's web site. +For a detailed introduction to programming in Lua, +see Roberto's book, Programming in Lua. + + + +

2 – Basic Concepts

+ + + +

+This section describes the basic concepts of the language. + + + + + +

2.1 – Values and Types

+ +

+Lua is a dynamically typed language. +This means that +variables do not have types; only values do. +There are no type definitions in the language. +All values carry their own type. + + +

+All values in Lua are first-class values. +This means that all values can be stored in variables, +passed as arguments to other functions, and returned as results. + + +

+There are eight basic types in Lua: +nil, boolean, number, +string, function, userdata, +thread, and table. +The type nil has one single value, nil, +whose main property is to be different from any other value; +it often represents the absence of a useful value. +The type boolean has two values, false and true. +Both nil and false make a condition false; +they are collectively called false values. +Any other value makes a condition true. +Despite its name, +false is frequently used as an alternative to nil, +with the key difference that false behaves +like a regular value in a table, +while a nil in a table represents an absent key. + + +

+The type number represents both +integer numbers and real (floating-point) numbers, +using two subtypes: integer and float. +Standard Lua uses 64-bit integers and double-precision (64-bit) floats, +but you can also compile Lua so that it +uses 32-bit integers and/or single-precision (32-bit) floats. +The option with 32 bits for both integers and floats +is particularly attractive +for small machines and embedded systems. +(See macro LUA_32BITS in file luaconf.h.) + + +

+Unless stated otherwise, +any overflow when manipulating integer values wrap around, +according to the usual rules of two-complement arithmetic. +(In other words, +the actual result is the unique representable integer +that is equal modulo 2n to the mathematical result, +where n is the number of bits of the integer type.) + + +

+Lua has explicit rules about when each subtype is used, +but it also converts between them automatically as needed (see §3.4.3). +Therefore, +the programmer may choose to mostly ignore the difference +between integers and floats +or to assume complete control over the representation of each number. + + +

+The type string represents immutable sequences of bytes. + +Lua is 8-bit clean: +strings can contain any 8-bit value, +including embedded zeros ('\0'). +Lua is also encoding-agnostic; +it makes no assumptions about the contents of a string. +The length of any string in Lua must fit in a Lua integer. + + +

+Lua can call (and manipulate) functions written in Lua and +functions written in C (see §3.4.10). +Both are represented by the type function. + + +

+The type userdata is provided to allow arbitrary C data to +be stored in Lua variables. +A userdata value represents a block of raw memory. +There are two kinds of userdata: +full userdata, +which is an object with a block of memory managed by Lua, +and light userdata, +which is simply a C pointer value. +Userdata has no predefined operations in Lua, +except assignment and identity test. +By using metatables, +the programmer can define operations for full userdata values +(see §2.4). +Userdata values cannot be created or modified in Lua, +only through the C API. +This guarantees the integrity of data owned by +the host program and C libraries. + + +

+The type thread represents independent threads of execution +and it is used to implement coroutines (see §2.6). +Lua threads are not related to operating-system threads. +Lua supports coroutines on all systems, +even those that do not support threads natively. + + +

+The type table implements associative arrays, +that is, arrays that can have as indices not only numbers, +but any Lua value except nil and NaN. +(Not a Number is a special floating-point value +used by the IEEE 754 standard to represent +undefined numerical results, such as 0/0.) +Tables can be heterogeneous; +that is, they can contain values of all types (except nil). +Any key associated to the value nil is not considered part of the table. +Conversely, any key that is not part of a table has +an associated value nil. + + +

+Tables are the sole data-structuring mechanism in Lua; +they can be used to represent ordinary arrays, lists, +symbol tables, sets, records, graphs, trees, etc. +To represent records, Lua uses the field name as an index. +The language supports this representation by +providing a.name as syntactic sugar for a["name"]. +There are several convenient ways to create tables in Lua +(see §3.4.9). + + +

+Like indices, +the values of table fields can be of any type. +In particular, +because functions are first-class values, +table fields can contain functions. +Thus tables can also carry methods (see §3.4.11). + + +

+The indexing of tables follows +the definition of raw equality in the language. +The expressions a[i] and a[j] +denote the same table element +if and only if i and j are raw equal +(that is, equal without metamethods). +In particular, floats with integral values +are equal to their respective integers +(e.g., 1.0 == 1). +To avoid ambiguities, +any float used as a key that is equal to an integer +is converted to that integer. +For instance, if you write a[2.0] = true, +the actual key inserted into the table will be the integer 2. + + +

+Tables, functions, threads, and (full) userdata values are objects: +variables do not actually contain these values, +only references to them. +Assignment, parameter passing, and function returns +always manipulate references to such values; +these operations do not imply any kind of copy. + + +

+The library function type returns a string describing the type +of a given value (see type). + + + + + +

2.2 – Environments and the Global Environment

+ +

+As we will discuss further in §3.2 and §3.3.3, +any reference to a free name +(that is, a name not bound to any declaration) var +is syntactically translated to _ENV.var. +Moreover, every chunk is compiled in the scope of +an external local variable named _ENV (see §3.3.2), +so _ENV itself is never a free name in a chunk. + + +

+Despite the existence of this external _ENV variable and +the translation of free names, +_ENV is a completely regular name. +In particular, +you can define new variables and parameters with that name. +Each reference to a free name uses the _ENV that is +visible at that point in the program, +following the usual visibility rules of Lua (see §3.5). + + +

+Any table used as the value of _ENV is called an environment. + + +

+Lua keeps a distinguished environment called the global environment. +This value is kept at a special index in the C registry (see §4.3). +In Lua, the global variable _G is initialized with this same value. +(_G is never used internally, +so changing its value will affect only your own code.) + + +

+When Lua loads a chunk, +the default value for its _ENV variable +is the global environment (see load). +Therefore, by default, +free names in Lua code refer to entries in the global environment +and, therefore, they are also called global variables. +Moreover, all standard libraries are loaded in the global environment +and some functions there operate on that environment. +You can use load (or loadfile) +to load a chunk with a different environment. +(In C, you have to load the chunk and then change the value +of its first upvalue; see lua_setupvalue.) + + + + + +

2.3 – Error Handling

+ +

+Several operations in Lua can raise an error. +An error interrupts the normal flow of the program, +which can continue by catching the error. + + +

+Lua code can explicitly raise an error by calling the +error function. +(This function never returns.) + + +

+To catch errors in Lua, +you can do a protected call, +using pcall (or xpcall). +The function pcall calls a given function in protected mode. +Any error while running the function stops its execution, +and control returns immediately to pcall, +which returns a status code. + + +

+Because Lua is an embedded extension language, +Lua code starts running by a call +from C code in the host program. +(When you use Lua standalone, +the lua application is the host program.) +Usually, this call is protected; +so, when an otherwise unprotected error occurs during +the compilation or execution of a Lua chunk, +control returns to the host, +which can take appropriate measures, +such as printing an error message. + + +

+Whenever there is an error, +an error object +is propagated with information about the error. +Lua itself only generates errors whose error object is a string, +but programs may generate errors with +any value as the error object. +It is up to the Lua program or its host to handle such error objects. +For historical reasons, +an error object is often called an error message, +even though it does not have to be a string. + + +

+When you use xpcall (or lua_pcall, in C) +you may give a message handler +to be called in case of errors. +This function is called with the original error object +and returns a new error object. +It is called before the error unwinds the stack, +so that it can gather more information about the error, +for instance by inspecting the stack and creating a stack traceback. +This message handler is still protected by the protected call; +so, an error inside the message handler +will call the message handler again. +If this loop goes on for too long, +Lua breaks it and returns an appropriate message. +The message handler is called only for regular runtime errors. +It is not called for memory-allocation errors +nor for errors while running finalizers or other message handlers. + + +

+Lua also offers a system of warnings (see warn). +Unlike errors, warnings do not interfere +in any way with program execution. +They typically only generate a message to the user, +although this behavior can be adapted from C (see lua_setwarnf). + + + + + +

2.4 – Metatables and Metamethods

+ +

+Every value in Lua can have a metatable. +This metatable is an ordinary Lua table +that defines the behavior of the original value +under certain events. +You can change several aspects of the behavior +of a value by setting specific fields in its metatable. +For instance, when a non-numeric value is the operand of an addition, +Lua checks for a function in the field __add of the value's metatable. +If it finds one, +Lua calls this function to perform the addition. + + +

+The key for each event in a metatable is a string +with the event name prefixed by two underscores; +the corresponding value is called a metavalue. +For most events, the metavalue must be a function, +which is then called a metamethod. +In the previous example, the key is the string "__add" +and the metamethod is the function that performs the addition. +Unless stated otherwise, +a metamethod may in fact be any callable value, +which is either a function or a value with a __call metamethod. + + +

+You can query the metatable of any value +using the getmetatable function. +Lua queries metamethods in metatables using a raw access (see rawget). + + +

+You can replace the metatable of tables +using the setmetatable function. +You cannot change the metatable of other types from Lua code, +except by using the debug library (§6.10). + + +

+Tables and full userdata have individual metatables, +although multiple tables and userdata can share their metatables. +Values of all other types share one single metatable per type; +that is, there is one single metatable for all numbers, +one for all strings, etc. +By default, a value has no metatable, +but the string library sets a metatable for the string type (see §6.4). + + +

+A detailed list of operations controlled by metatables is given next. +Each event is identified by its corresponding key. +By convention, all metatable keys used by Lua are composed by +two underscores followed by lowercase Latin letters. + + + +

    + +
  • __add: +the addition (+) operation. +If any operand for an addition is not a number, +Lua will try to call a metamethod. +It starts by checking the first operand (even if it is a number); +if that operand does not define a metamethod for __add, +then Lua will check the second operand. +If Lua can find a metamethod, +it calls the metamethod with the two operands as arguments, +and the result of the call +(adjusted to one value) +is the result of the operation. +Otherwise, if no metamethod is found, +Lua raises an error. +
    • + +
  • __sub: +the subtraction (-) operation. +Behavior similar to the addition operation. +
    • + +
  • __mul: +the multiplication (*) operation. +Behavior similar to the addition operation. +
    • + +
  • __div: +the division (/) operation. +Behavior similar to the addition operation. +
    • + +
  • __mod: +the modulo (%) operation. +Behavior similar to the addition operation. +
    • + +
  • __pow: +the exponentiation (^) operation. +Behavior similar to the addition operation. +
    • + +
  • __unm: +the negation (unary -) operation. +Behavior similar to the addition operation. +
    • + +
  • __idiv: +the floor division (//) operation. +Behavior similar to the addition operation. +
    • + +
  • __band: +the bitwise AND (&) operation. +Behavior similar to the addition operation, +except that Lua will try a metamethod +if any operand is neither an integer +nor a float coercible to an integer (see §3.4.3). +
    • + +
  • __bor: +the bitwise OR (|) operation. +Behavior similar to the bitwise AND operation. +
    • + +
  • __bxor: +the bitwise exclusive OR (binary ~) operation. +Behavior similar to the bitwise AND operation. +
    • + +
  • __bnot: +the bitwise NOT (unary ~) operation. +Behavior similar to the bitwise AND operation. +
    • + +
  • __shl: +the bitwise left shift (<<) operation. +Behavior similar to the bitwise AND operation. +
    • + +
  • __shr: +the bitwise right shift (>>) operation. +Behavior similar to the bitwise AND operation. +
    • + +
  • __concat: +the concatenation (..) operation. +Behavior similar to the addition operation, +except that Lua will try a metamethod +if any operand is neither a string nor a number +(which is always coercible to a string). +
    • + +
  • __len: +the length (#) operation. +If the object is not a string, +Lua will try its metamethod. +If there is a metamethod, +Lua calls it with the object as argument, +and the result of the call +(always adjusted to one value) +is the result of the operation. +If there is no metamethod but the object is a table, +then Lua uses the table length operation (see §3.4.7). +Otherwise, Lua raises an error. +
    • + +
  • __eq: +the equal (==) operation. +Behavior similar to the addition operation, +except that Lua will try a metamethod only when the values +being compared are either both tables or both full userdata +and they are not primitively equal. +The result of the call is always converted to a boolean. +
    • + +
  • __lt: +the less than (<) operation. +Behavior similar to the addition operation, +except that Lua will try a metamethod only when the values +being compared are neither both numbers nor both strings. +Moreover, the result of the call is always converted to a boolean. +
    • + +
  • __le: +the less equal (<=) operation. +Behavior similar to the less than operation. +
    • + +
  • __index: +The indexing access operation table[key]. +This event happens when table is not a table or +when key is not present in table. +The metavalue is looked up in the metatable of table. + + +

    +The metavalue for this event can be either a function, a table, +or any value with an __index metavalue. +If it is a function, +it is called with table and key as arguments, +and the result of the call +(adjusted to one value) +is the result of the operation. +Otherwise, +the final result is the result of indexing this metavalue with key. +This indexing is regular, not raw, +and therefore can trigger another __index metavalue. +

    • + +
  • __newindex: +The indexing assignment table[key] = value. +Like the index event, +this event happens when table is not a table or +when key is not present in table. +The metavalue is looked up in the metatable of table. + + +

    +Like with indexing, +the metavalue for this event can be either a function, a table, +or any value with an __newindex metavalue. +If it is a function, +it is called with table, key, and value as arguments. +Otherwise, +Lua repeats the indexing assignment over this metavalue +with the same key and value. +This assignment is regular, not raw, +and therefore can trigger another __newindex metavalue. + + +

    +Whenever a __newindex metavalue is invoked, +Lua does not perform the primitive assignment. +If needed, +the metamethod itself can call rawset +to do the assignment. +

    • + +
  • __call: +The call operation func(args). +This event happens when Lua tries to call a non-function value +(that is, func is not a function). +The metamethod is looked up in func. +If present, +the metamethod is called with func as its first argument, +followed by the arguments of the original call (args). +All results of the call +are the results of the operation. +This is the only metamethod that allows multiple results. +
    • + +
+ +

+In addition to the previous list, +the interpreter also respects the following keys in metatables: +__gc (see §2.5.3), +__close (see §3.3.8), +__mode (see §2.5.4), +and __name. +(The entry __name, +when it contains a string, +may be used by tostring and in error messages.) + + +

+For the unary operators (negation, length, and bitwise NOT), +the metamethod is computed and called with a dummy second operand, +equal to the first one. +This extra operand is only to simplify Lua's internals +(by making these operators behave like a binary operation) +and may be removed in future versions. +For most uses this extra operand is irrelevant. + + +

+Because metatables are regular tables, +they can contain arbitrary fields, +not only the event names defined above. +Some functions in the standard library +(e.g., tostring) +use other fields in metatables for their own purposes. + + +

+It is a good practice to add all needed metamethods to a table +before setting it as a metatable of some object. +In particular, the __gc metamethod works only when this order +is followed (see §2.5.3). +It is also a good practice to set the metatable of an object +right after its creation. + + + + + +

2.5 – Garbage Collection

+ + + +

+Lua performs automatic memory management. +This means that +you do not have to worry about allocating memory for new objects +or freeing it when the objects are no longer needed. +Lua manages memory automatically by running +a garbage collector to collect all dead objects. +All memory used by Lua is subject to automatic management: +strings, tables, userdata, functions, threads, internal structures, etc. + + +

+An object is considered dead +as soon as the collector can be sure the object +will not be accessed again in the normal execution of the program. +("Normal execution" here excludes finalizers, +which can resurrect dead objects (see §2.5.3), +and excludes also operations using the debug library.) +Note that the time when the collector can be sure that an object +is dead may not coincide with the programmer's expectations. +The only guarantees are that Lua will not collect an object +that may still be accessed in the normal execution of the program, +and it will eventually collect an object +that is inaccessible from Lua. +(Here, +inaccessible from Lua means that neither a variable nor +another live object refer to the object.) +Because Lua has no knowledge about C code, +it never collects objects accessible through the registry (see §4.3), +which includes the global environment (see §2.2). + + +

+The garbage collector (GC) in Lua can work in two modes: +incremental and generational. + + +

+The default GC mode with the default parameters +are adequate for most uses. +However, programs that waste a large proportion of their time +allocating and freeing memory can benefit from other settings. +Keep in mind that the GC behavior is non-portable +both across platforms and across different Lua releases; +therefore, optimal settings are also non-portable. + + +

+You can change the GC mode and parameters by calling +lua_gc in C +or collectgarbage in Lua. +You can also use these functions to control +the collector directly (e.g., to stop and restart it). + + + + + +

2.5.1 – Incremental Garbage Collection

+ +

+In incremental mode, +each GC cycle performs a mark-and-sweep collection in small steps +interleaved with the program's execution. +In this mode, +the collector uses three numbers to control its garbage-collection cycles: +the garbage-collector pause, +the garbage-collector step multiplier, +and the garbage-collector step size. + + +

+The garbage-collector pause +controls how long the collector waits before starting a new cycle. +The collector starts a new cycle when the use of memory +hits n% of the use after the previous collection. +Larger values make the collector less aggressive. +Values equal to or less than 100 mean the collector will not wait to +start a new cycle. +A value of 200 means that the collector waits for the total memory in use +to double before starting a new cycle. +The default value is 200; the maximum value is 1000. + + +

+The garbage-collector step multiplier +controls the speed of the collector relative to +memory allocation, +that is, +how many elements it marks or sweeps for each +kilobyte of memory allocated. +Larger values make the collector more aggressive but also increase +the size of each incremental step. +You should not use values less than 100, +because they make the collector too slow and +can result in the collector never finishing a cycle. +The default value is 100; the maximum value is 1000. + + +

+The garbage-collector step size controls the +size of each incremental step, +specifically how many bytes the interpreter allocates +before performing a step. +This parameter is logarithmic: +A value of n means the interpreter will allocate 2n +bytes between steps and perform equivalent work during the step. +A large value (e.g., 60) makes the collector a stop-the-world +(non-incremental) collector. +The default value is 13, +which means steps of approximately 8 Kbytes. + + + + + +

2.5.2 – Generational Garbage Collection

+ +

+In generational mode, +the collector does frequent minor collections, +which traverses only objects recently created. +If after a minor collection the use of memory is still above a limit, +the collector does a stop-the-world major collection, +which traverses all objects. +The generational mode uses two parameters: +the minor multiplier and the the major multiplier. + + +

+The minor multiplier controls the frequency of minor collections. +For a minor multiplier x, +a new minor collection will be done when memory +grows x% larger than the memory in use after the previous major +collection. +For instance, for a multiplier of 20, +the collector will do a minor collection when the use of memory +gets 20% larger than the use after the previous major collection. +The default value is 20; the maximum value is 200. + + +

+The major multiplier controls the frequency of major collections. +For a major multiplier x, +a new major collection will be done when memory +grows x% larger than the memory in use after the previous major +collection. +For instance, for a multiplier of 100, +the collector will do a major collection when the use of memory +gets larger than twice the use after the previous collection. +The default value is 100; the maximum value is 1000. + + + + + +

2.5.3 – Garbage-Collection Metamethods

+ +

+You can set garbage-collector metamethods for tables +and, using the C API, +for full userdata (see §2.4). +These metamethods, called finalizers, +are called when the garbage collector detects that the +corresponding table or userdata is dead. +Finalizers allow you to coordinate Lua's garbage collection +with external resource management such as closing files, +network or database connections, +or freeing your own memory. + + +

+For an object (table or userdata) to be finalized when collected, +you must mark it for finalization. + +You mark an object for finalization when you set its metatable +and the metatable has a __gc metamethod. +Note that if you set a metatable without a __gc field +and later create that field in the metatable, +the object will not be marked for finalization. + + +

+When a marked object becomes dead, +it is not collected immediately by the garbage collector. +Instead, Lua puts it in a list. +After the collection, +Lua goes through that list. +For each object in the list, +it checks the object's __gc metamethod: +If it is present, +Lua calls it with the object as its single argument. + + +

+At the end of each garbage-collection cycle, +the finalizers are called in +the reverse order that the objects were marked for finalization, +among those collected in that cycle; +that is, the first finalizer to be called is the one associated +with the object marked last in the program. +The execution of each finalizer may occur at any point during +the execution of the regular code. + + +

+Because the object being collected must still be used by the finalizer, +that object (and other objects accessible only through it) +must be resurrected by Lua. +Usually, this resurrection is transient, +and the object memory is freed in the next garbage-collection cycle. +However, if the finalizer stores the object in some global place +(e.g., a global variable), +then the resurrection is permanent. +Moreover, if the finalizer marks a finalizing object for finalization again, +its finalizer will be called again in the next cycle where the +object is dead. +In any case, +the object memory is freed only in a GC cycle where +the object is dead and not marked for finalization. + + +

+When you close a state (see lua_close), +Lua calls the finalizers of all objects marked for finalization, +following the reverse order that they were marked. +If any finalizer marks objects for collection during that phase, +these marks have no effect. + + +

+Finalizers cannot yield nor run the garbage collector. +Because they can run in unpredictable times, +it is good practice to restrict each finalizer +to the minimum necessary to properly release +its associated resource. + + +

+Any error while running a finalizer generates a warning; +the error is not propagated. + + + + + +

2.5.4 – Weak Tables

+ +

+A weak table is a table whose elements are +weak references. +A weak reference is ignored by the garbage collector. +In other words, +if the only references to an object are weak references, +then the garbage collector will collect that object. + + +

+A weak table can have weak keys, weak values, or both. +A table with weak values allows the collection of its values, +but prevents the collection of its keys. +A table with both weak keys and weak values allows the collection of +both keys and values. +In any case, if either the key or the value is collected, +the whole pair is removed from the table. +The weakness of a table is controlled by the +__mode field of its metatable. +This metavalue, if present, must be one of the following strings: +"k", for a table with weak keys; +"v", for a table with weak values; +or "kv", for a table with both weak keys and values. + + +

+A table with weak keys and strong values +is also called an ephemeron table. +In an ephemeron table, +a value is considered reachable only if its key is reachable. +In particular, +if the only reference to a key comes through its value, +the pair is removed. + + +

+Any change in the weakness of a table may take effect only +at the next collect cycle. +In particular, if you change the weakness to a stronger mode, +Lua may still collect some items from that table +before the change takes effect. + + +

+Only objects that have an explicit construction +are removed from weak tables. +Values, such as numbers and light C functions, +are not subject to garbage collection, +and therefore are not removed from weak tables +(unless their associated values are collected). +Although strings are subject to garbage collection, +they do not have an explicit construction and +their equality is by value; +they behave more like values than like objects. +Therefore, they are not removed from weak tables. + + +

+Resurrected objects +(that is, objects being finalized +and objects accessible only through objects being finalized) +have a special behavior in weak tables. +They are removed from weak values before running their finalizers, +but are removed from weak keys only in the next collection +after running their finalizers, when such objects are actually freed. +This behavior allows the finalizer to access properties +associated with the object through weak tables. + + +

+If a weak table is among the resurrected objects in a collection cycle, +it may not be properly cleared until the next cycle. + + + + + + + +

2.6 – Coroutines

+ +

+Lua supports coroutines, +also called collaborative multithreading. +A coroutine in Lua represents an independent thread of execution. +Unlike threads in multithread systems, however, +a coroutine only suspends its execution by explicitly calling +a yield function. + + +

+You create a coroutine by calling coroutine.create. +Its sole argument is a function +that is the main function of the coroutine. +The create function only creates a new coroutine and +returns a handle to it (an object of type thread); +it does not start the coroutine. + + +

+You execute a coroutine by calling coroutine.resume. +When you first call coroutine.resume, +passing as its first argument +a thread returned by coroutine.create, +the coroutine starts its execution by +calling its main function. +Extra arguments passed to coroutine.resume are passed +as arguments to that function. +After the coroutine starts running, +it runs until it terminates or yields. + + +

+A coroutine can terminate its execution in two ways: +normally, when its main function returns +(explicitly or implicitly, after the last instruction); +and abnormally, if there is an unprotected error. +In case of normal termination, +coroutine.resume returns true, +plus any values returned by the coroutine main function. +In case of errors, coroutine.resume returns false +plus the error object. +In this case, the coroutine does not unwind its stack, +so that it is possible to inspect it after the error +with the debug API. + + +

+A coroutine yields by calling coroutine.yield. +When a coroutine yields, +the corresponding coroutine.resume returns immediately, +even if the yield happens inside nested function calls +(that is, not in the main function, +but in a function directly or indirectly called by the main function). +In the case of a yield, coroutine.resume also returns true, +plus any values passed to coroutine.yield. +The next time you resume the same coroutine, +it continues its execution from the point where it yielded, +with the call to coroutine.yield returning any extra +arguments passed to coroutine.resume. + + +

+Like coroutine.create, +the coroutine.wrap function also creates a coroutine, +but instead of returning the coroutine itself, +it returns a function that, when called, resumes the coroutine. +Any arguments passed to this function +go as extra arguments to coroutine.resume. +coroutine.wrap returns all the values returned by coroutine.resume, +except the first one (the boolean error code). +Unlike coroutine.resume, +the function created by coroutine.wrap +propagates any error to the caller. +In this case, +the function also closes the coroutine (see coroutine.close). + + +

+As an example of how coroutines work, +consider the following code: + +

+     function foo (a)
+       print("foo", a)
+       return coroutine.yield(2*a)
+     end
+     
+     co = coroutine.create(function (a,b)
+           print("co-body", a, b)
+           local r = foo(a+1)
+           print("co-body", r)
+           local r, s = coroutine.yield(a+b, a-b)
+           print("co-body", r, s)
+           return b, "end"
+     end)
+     
+     print("main", coroutine.resume(co, 1, 10))
+     print("main", coroutine.resume(co, "r"))
+     print("main", coroutine.resume(co, "x", "y"))
+     print("main", coroutine.resume(co, "x", "y"))
+

+When you run it, it produces the following output: + +

+     co-body 1       10
+     foo     2
+     main    true    4
+     co-body r
+     main    true    11      -9
+     co-body x       y
+     main    true    10      end
+     main    false   cannot resume dead coroutine
+
+ +

+You can also create and manipulate coroutines through the C API: +see functions lua_newthread, lua_resume, +and lua_yield. + + + + + +

3 – The Language

+ + + +

+This section describes the lexis, the syntax, and the semantics of Lua. +In other words, +this section describes +which tokens are valid, +how they can be combined, +and what their combinations mean. + + +

+Language constructs will be explained using the usual extended BNF notation, +in which +{a} means 0 or more a's, and +[a] means an optional a. +Non-terminals are shown like non-terminal, +keywords are shown like kword, +and other terminal symbols are shown like ‘=’. +The complete syntax of Lua can be found in §9 +at the end of this manual. + + + + + +

3.1 – Lexical Conventions

+ +

+Lua is a free-form language. +It ignores spaces and comments between lexical elements (tokens), +except as delimiters between two tokens. +In source code, +Lua recognizes as spaces the standard ASCII whitespace +characters space, form feed, newline, +carriage return, horizontal tab, and vertical tab. + + +

+Names +(also called identifiers) +in Lua can be any string of Latin letters, +Arabic-Indic digits, and underscores, +not beginning with a digit and +not being a reserved word. +Identifiers are used to name variables, table fields, and labels. + + +

+The following keywords are reserved +and cannot be used as names: + + +

+     and       break     do        else      elseif    end
+     false     for       function  goto      if        in
+     local     nil       not       or        repeat    return
+     then      true      until     while
+
+ +

+Lua is a case-sensitive language: +and is a reserved word, but And and AND +are two different, valid names. +As a convention, +programs should avoid creating +names that start with an underscore followed by +one or more uppercase letters (such as _VERSION). + + +

+The following strings denote other tokens: + +

+     +     -     *     /     %     ^     #
+     &     ~     |     <<    >>    //
+     ==    ~=    <=    >=    <     >     =
+     (     )     {     }     [     ]     ::
+     ;     :     ,     .     ..    ...
+
+ +

+A short literal string +can be delimited by matching single or double quotes, +and can contain the following C-like escape sequences: +'\a' (bell), +'\b' (backspace), +'\f' (form feed), +'\n' (newline), +'\r' (carriage return), +'\t' (horizontal tab), +'\v' (vertical tab), +'\\' (backslash), +'\"' (quotation mark [double quote]), +and '\'' (apostrophe [single quote]). +A backslash followed by a line break +results in a newline in the string. +The escape sequence '\z' skips the following span +of whitespace characters, +including line breaks; +it is particularly useful to break and indent a long literal string +into multiple lines without adding the newlines and spaces +into the string contents. +A short literal string cannot contain unescaped line breaks +nor escapes not forming a valid escape sequence. + + +

+We can specify any byte in a short literal string, +including embedded zeros, +by its numeric value. +This can be done +with the escape sequence \xXX, +where XX is a sequence of exactly two hexadecimal digits, +or with the escape sequence \ddd, +where ddd is a sequence of up to three decimal digits. +(Note that if a decimal escape sequence is to be followed by a digit, +it must be expressed using exactly three digits.) + + +

+The UTF-8 encoding of a Unicode character +can be inserted in a literal string with +the escape sequence \u{XXX} +(with mandatory enclosing braces), +where XXX is a sequence of one or more hexadecimal digits +representing the character code point. +This code point can be any value less than 231. +(Lua uses the original UTF-8 specification here, +which is not restricted to valid Unicode code points.) + + +

+Literal strings can also be defined using a long format +enclosed by long brackets. +We define an opening long bracket of level n as an opening +square bracket followed by n equal signs followed by another +opening square bracket. +So, an opening long bracket of level 0 is written as [[, +an opening long bracket of level 1 is written as [=[, +and so on. +A closing long bracket is defined similarly; +for instance, +a closing long bracket of level 4 is written as ]====]. +A long literal starts with an opening long bracket of any level and +ends at the first closing long bracket of the same level. +It can contain any text except a closing bracket of the same level. +Literals in this bracketed form can run for several lines, +do not interpret any escape sequences, +and ignore long brackets of any other level. +Any kind of end-of-line sequence +(carriage return, newline, carriage return followed by newline, +or newline followed by carriage return) +is converted to a simple newline. +When the opening long bracket is immediately followed by a newline, +the newline is not included in the string. + + +

+As an example, in a system using ASCII +(in which 'a' is coded as 97, +newline is coded as 10, and '1' is coded as 49), +the five literal strings below denote the same string: + +

+     a = 'alo\n123"'
+     a = "alo\n123\""
+     a = '\97lo\10\04923"'
+     a = [[alo
+     123"]]
+     a = [==[
+     alo
+     123"]==]
+
+ +

+Any byte in a literal string not +explicitly affected by the previous rules represents itself. +However, Lua opens files for parsing in text mode, +and the system's file functions may have problems with +some control characters. +So, it is safer to represent +binary data as a quoted literal with +explicit escape sequences for the non-text characters. + + +

+A numeric constant (or numeral) +can be written with an optional fractional part +and an optional decimal exponent, +marked by a letter 'e' or 'E'. +Lua also accepts hexadecimal constants, +which start with 0x or 0X. +Hexadecimal constants also accept an optional fractional part +plus an optional binary exponent, +marked by a letter 'p' or 'P' and written in decimal. +(For instance, 0x1.fp10 denotes 1984, +which is 0x1f / 16 multiplied by 210.) + + +

+A numeric constant with a radix point or an exponent +denotes a float; +otherwise, +if its value fits in an integer or it is a hexadecimal constant, +it denotes an integer; +otherwise (that is, a decimal integer numeral that overflows), +it denotes a float. +Hexadecimal numerals with neither a radix point nor an exponent +always denote an integer value; +if the value overflows, it wraps around +to fit into a valid integer. + + +

+Examples of valid integer constants are + +

+     3   345   0xff   0xBEBADA
+

+Examples of valid float constants are + +

+     3.0     3.1416     314.16e-2     0.31416E1     34e1
+     0x0.1E  0xA23p-4   0X1.921FB54442D18P+1
+
+ +

+A comment starts with a double hyphen (--) +anywhere outside a string. +If the text immediately after -- is not an opening long bracket, +the comment is a short comment, +which runs until the end of the line. +Otherwise, it is a long comment, +which runs until the corresponding closing long bracket. + + + + + +

3.2 – Variables

+ +

+Variables are places that store values. +There are three kinds of variables in Lua: +global variables, local variables, and table fields. + + +

+A single name can denote a global variable or a local variable +(or a function's formal parameter, +which is a particular kind of local variable): + +

+	var ::= Name
+

+Name denotes identifiers (see §3.1). + + +

+Any variable name is assumed to be global unless explicitly declared +as a local (see §3.3.7). +Local variables are lexically scoped: +local variables can be freely accessed by functions +defined inside their scope (see §3.5). + + +

+Before the first assignment to a variable, its value is nil. + + +

+Square brackets are used to index a table: + +

+	var ::= prefixexp ‘[’ exp ‘]’
+

+The meaning of accesses to table fields can be changed via metatables +(see §2.4). + + +

+The syntax var.Name is just syntactic sugar for +var["Name"]: + +

+	var ::= prefixexp ‘.’ Name
+
+ +

+An access to a global variable x +is equivalent to _ENV.x. +Due to the way that chunks are compiled, +the variable _ENV itself is never global (see §2.2). + + + + + +

3.3 – Statements

+ + + +

+Lua supports an almost conventional set of statements, +similar to those in other conventional languages. +This set includes +blocks, assignments, control structures, function calls, +and variable declarations. + + + + + +

3.3.1 – Blocks

+ +

+A block is a list of statements, +which are executed sequentially: + +

+	block ::= {stat}
+

+Lua has empty statements +that allow you to separate statements with semicolons, +start a block with a semicolon +or write two semicolons in sequence: + +

+	stat ::= ‘;’
+
+ +

+Both function calls and assignments +can start with an open parenthesis. +This possibility leads to an ambiguity in Lua's grammar. +Consider the following fragment: + +

+     a = b + c
+     (print or io.write)('done')
+

+The grammar could see this fragment in two ways: + +

+     a = b + c(print or io.write)('done')
+     
+     a = b + c; (print or io.write)('done')
+

+The current parser always sees such constructions +in the first way, +interpreting the open parenthesis +as the start of the arguments to a call. +To avoid this ambiguity, +it is a good practice to always precede with a semicolon +statements that start with a parenthesis: + +

+     ;(print or io.write)('done')
+
+ +

+A block can be explicitly delimited to produce a single statement: + +

+	stat ::= do block end
+

+Explicit blocks are useful +to control the scope of variable declarations. +Explicit blocks are also sometimes used to +add a return statement in the middle +of another block (see §3.3.4). + + + + + +

3.3.2 – Chunks

+ +

+The unit of compilation of Lua is called a chunk. +Syntactically, +a chunk is simply a block: + +

+	chunk ::= block
+
+ +

+Lua handles a chunk as the body of an anonymous function +with a variable number of arguments +(see §3.4.11). +As such, chunks can define local variables, +receive arguments, and return values. +Moreover, such anonymous function is compiled as in the +scope of an external local variable called _ENV (see §2.2). +The resulting function always has _ENV as its only external variable, +even if it does not use that variable. + + +

+A chunk can be stored in a file or in a string inside the host program. +To execute a chunk, +Lua first loads it, +precompiling the chunk's code into instructions for a virtual machine, +and then Lua executes the compiled code +with an interpreter for the virtual machine. + + +

+Chunks can also be precompiled into binary form; +see the program luac and the function string.dump for details. +Programs in source and compiled forms are interchangeable; +Lua automatically detects the file type and acts accordingly (see load). + + + + + +

3.3.3 – Assignment

+ +

+Lua allows multiple assignments. +Therefore, the syntax for assignment +defines a list of variables on the left side +and a list of expressions on the right side. +The elements in both lists are separated by commas: + +

+	stat ::= varlist ‘=’ explist
+	varlist ::= var {‘,’ var}
+	explist ::= exp {‘,’ exp}
+

+Expressions are discussed in §3.4. + + +

+Before the assignment, +the list of values is adjusted to the length of +the list of variables (see §3.4.12). + + +

+If a variable is both assigned and read +inside a multiple assignment, +Lua ensures that all reads get the value of the variable +before the assignment. +Thus the code + +

+     i = 3
+     i, a[i] = i+1, 20
+

+sets a[3] to 20, without affecting a[4] +because the i in a[i] is evaluated (to 3) +before it is assigned 4. +Similarly, the line + +

+     x, y = y, x
+

+exchanges the values of x and y, +and + +

+     x, y, z = y, z, x
+

+cyclically permutes the values of x, y, and z. + + +

+Note that this guarantee covers only accesses +syntactically inside the assignment statement. +If a function or a metamethod called during the assignment +changes the value of a variable, +Lua gives no guarantees about the order of that access. + + +

+An assignment to a global name x = val +is equivalent to the assignment +_ENV.x = val (see §2.2). + + +

+The meaning of assignments to table fields and +global variables (which are actually table fields, too) +can be changed via metatables (see §2.4). + + + + + +

3.3.4 – Control Structures

+The control structures +if, while, and repeat have the usual meaning and +familiar syntax: + + + + +

+	stat ::= while exp do block end
+	stat ::= repeat block until exp
+	stat ::= if exp then block {elseif exp then block} [else block] end
+

+Lua also has a for statement, in two flavors (see §3.3.5). + + +

+The condition expression of a +control structure can return any value. +Both false and nil test false. +All values different from nil and false test true. +In particular, the number 0 and the empty string also test true. + + +

+In the repeat–until loop, +the inner block does not end at the until keyword, +but only after the condition. +So, the condition can refer to local variables +declared inside the loop block. + + +

+The goto statement transfers the program control to a label. +For syntactical reasons, +labels in Lua are considered statements too: + + + +

+	stat ::= goto Name
+	stat ::= label
+	label ::= ‘::’ Name ‘::’
+
+ +

+A label is visible in the entire block where it is defined, +except inside nested functions. +A goto may jump to any visible label as long as it does not +enter into the scope of a local variable. +A label should not be declared +where a label with the same name is visible, +even if this other label has been declared in an enclosing block. + + +

+The break statement terminates the execution of a +while, repeat, or for loop, +skipping to the next statement after the loop: + + +

+	stat ::= break
+

+A break ends the innermost enclosing loop. + + +

+The return statement is used to return values +from a function or a chunk +(which is handled as an anonymous function). + +Functions can return more than one value, +so the syntax for the return statement is + +

+	stat ::= return [explist] [‘;’]
+
+ +

+The return statement can only be written +as the last statement of a block. +If it is necessary to return in the middle of a block, +then an explicit inner block can be used, +as in the idiom do return end, +because now return is the last statement in its (inner) block. + + + + + +

3.3.5 – For Statement

+ +

+ +The for statement has two forms: +one numerical and one generic. + + + +

The numerical for loop

+ +

+The numerical for loop repeats a block of code while a +control variable goes through an arithmetic progression. +It has the following syntax: + +

+	stat ::= for Name ‘=’ exp ‘,’ exp [‘,’ exp] do block end
+

+The given identifier (Name) defines the control variable, +which is a new variable local to the loop body (block). + + +

+The loop starts by evaluating once the three control expressions. +Their values are called respectively +the initial value, the limit, and the step. +If the step is absent, it defaults to 1. + + +

+If both the initial value and the step are integers, +the loop is done with integers; +note that the limit may not be an integer. +Otherwise, the three values are converted to +floats and the loop is done with floats. +Beware of floating-point accuracy in this case. + + +

+After that initialization, +the loop body is repeated with the value of the control variable +going through an arithmetic progression, +starting at the initial value, +with a common difference given by the step. +A negative step makes a decreasing sequence; +a step equal to zero raises an error. +The loop continues while the value is less than +or equal to the limit +(greater than or equal to for a negative step). +If the initial value is already greater than the limit +(or less than, if the step is negative), +the body is not executed. + + +

+For integer loops, +the control variable never wraps around; +instead, the loop ends in case of an overflow. + + +

+You should not change the value of the control variable +during the loop. +If you need its value after the loop, +assign it to another variable before exiting the loop. + + + + + +

The generic for loop

+ +

+The generic for statement works over functions, +called iterators. +On each iteration, the iterator function is called to produce a new value, +stopping when this new value is nil. +The generic for loop has the following syntax: + +

+	stat ::= for namelist in explist do block end
+	namelist ::= Name {‘,’ Name}
+

+A for statement like + +

+     for var_1, ···, var_n in explist do body end
+

+works as follows. + + +

+The names var_i declare loop variables local to the loop body. +The first of these variables is the control variable. + + +

+The loop starts by evaluating explist +to produce four values: +an iterator function, +a state, +an initial value for the control variable, +and a closing value. + + +

+Then, at each iteration, +Lua calls the iterator function with two arguments: +the state and the control variable. +The results from this call are then assigned to the loop variables, +following the rules of multiple assignments (see §3.3.3). +If the control variable becomes nil, +the loop terminates. +Otherwise, the body is executed and the loop goes +to the next iteration. + + +

+The closing value behaves like a +to-be-closed variable (see §3.3.8), +which can be used to release resources when the loop ends. +Otherwise, it does not interfere with the loop. + + +

+You should not change the value of the control variable +during the loop. + + + + + + + +

3.3.6 – Function Calls as Statements

+To allow possible side-effects, +function calls can be executed as statements: + +

+	stat ::= functioncall
+

+In this case, all returned values are thrown away. +Function calls are explained in §3.4.10. + + + + + +

3.3.7 – Local Declarations

+Local variables can be declared anywhere inside a block. +The declaration can include an initialization: + +

+	stat ::= local attnamelist [‘=’ explist]
+	attnamelist ::=  Name attrib {‘,’ Name attrib}
+

+If present, an initial assignment has the same semantics +of a multiple assignment (see §3.3.3). +Otherwise, all variables are initialized with nil. + + +

+Each variable name may be postfixed by an attribute +(a name between angle brackets): + +

+	attrib ::= [‘<’ Name ‘>’]
+

+There are two possible attributes: +const, which declares a constant variable, +that is, a variable that cannot be assigned to +after its initialization; +and close, which declares a to-be-closed variable (see §3.3.8). +A list of variables can contain at most one to-be-closed variable. + + +

+A chunk is also a block (see §3.3.2), +and so local variables can be declared in a chunk outside any explicit block. + + +

+The visibility rules for local variables are explained in §3.5. + + + + + +

3.3.8 – To-be-closed Variables

+ +

+A to-be-closed variable behaves like a constant local variable, +except that its value is closed whenever the variable +goes out of scope, including normal block termination, +exiting its block by break/goto/return, +or exiting by an error. + + +

+Here, to close a value means +to call its __close metamethod. +When calling the metamethod, +the value itself is passed as the first argument +and the error object that caused the exit (if any) +is passed as a second argument; +if there was no error, the second argument is nil. + + +

+The value assigned to a to-be-closed variable +must have a __close metamethod +or be a false value. +(nil and false are ignored as to-be-closed values.) + + +

+If several to-be-closed variables go out of scope at the same event, +they are closed in the reverse order that they were declared. + + +

+If there is any error while running a closing method, +that error is handled like an error in the regular code +where the variable was defined. +After an error, +the other pending closing methods will still be called. + + +

+If a coroutine yields and is never resumed again, +some variables may never go out of scope, +and therefore they will never be closed. +(These variables are the ones created inside the coroutine +and in scope at the point where the coroutine yielded.) +Similarly, if a coroutine ends with an error, +it does not unwind its stack, +so it does not close any variable. +In both cases, +you can either use finalizers +or call coroutine.close to close the variables. +However, if the coroutine was created +through coroutine.wrap, +then its corresponding function will close the coroutine +in case of errors. + + + + + + + +

3.4 – Expressions

+ + + +

+The basic expressions in Lua are the following: + +

+	exp ::= prefixexp
+	exp ::= nil | false | true
+	exp ::= Numeral
+	exp ::= LiteralString
+	exp ::= functiondef
+	exp ::= tableconstructor
+	exp ::= ‘...’
+	exp ::= exp binop exp
+	exp ::= unop exp
+	prefixexp ::= var | functioncall | ‘(’ exp ‘)’
+
+ +

+Numerals and literal strings are explained in §3.1; +variables are explained in §3.2; +function definitions are explained in §3.4.11; +function calls are explained in §3.4.10; +table constructors are explained in §3.4.9. +Vararg expressions, +denoted by three dots ('...'), can only be used when +directly inside a variadic function; +they are explained in §3.4.11. + + +

+Binary operators comprise arithmetic operators (see §3.4.1), +bitwise operators (see §3.4.2), +relational operators (see §3.4.4), logical operators (see §3.4.5), +and the concatenation operator (see §3.4.6). +Unary operators comprise the unary minus (see §3.4.1), +the unary bitwise NOT (see §3.4.2), +the unary logical not (see §3.4.5), +and the unary length operator (see §3.4.7). + + + + + +

3.4.1 – Arithmetic Operators

+Lua supports the following arithmetic operators: + +

    +
  • +: addition
    • +
  • -: subtraction
    • +
  • *: multiplication
    • +
  • /: float division
    • +
  • //: floor division
    • +
  • %: modulo
    • +
  • ^: exponentiation
    • +
  • -: unary minus
    • +
+ +

+With the exception of exponentiation and float division, +the arithmetic operators work as follows: +If both operands are integers, +the operation is performed over integers and the result is an integer. +Otherwise, if both operands are numbers, +then they are converted to floats, +the operation is performed following the machine's rules +for floating-point arithmetic +(usually the IEEE 754 standard), +and the result is a float. +(The string library coerces strings to numbers in +arithmetic operations; see §3.4.3 for details.) + + +

+Exponentiation and float division (/) +always convert their operands to floats +and the result is always a float. +Exponentiation uses the ISO C function pow, +so that it works for non-integer exponents too. + + +

+Floor division (//) is a division +that rounds the quotient towards minus infinity, +resulting in the floor of the division of its operands. + + +

+Modulo is defined as the remainder of a division +that rounds the quotient towards minus infinity (floor division). + + +

+In case of overflows in integer arithmetic, +all operations wrap around. + + + +

3.4.2 – Bitwise Operators

+Lua supports the following bitwise operators: + +

    +
  • &: bitwise AND
    • +
  • |: bitwise OR
    • +
  • ~: bitwise exclusive OR
    • +
  • >>: right shift
    • +
  • <<: left shift
    • +
  • ~: unary bitwise NOT
    • +
+ +

+All bitwise operations convert its operands to integers +(see §3.4.3), +operate on all bits of those integers, +and result in an integer. + + +

+Both right and left shifts fill the vacant bits with zeros. +Negative displacements shift to the other direction; +displacements with absolute values equal to or higher than +the number of bits in an integer +result in zero (as all bits are shifted out). + + + + + +

3.4.3 – Coercions and Conversions

+Lua provides some automatic conversions between some +types and representations at run time. +Bitwise operators always convert float operands to integers. +Exponentiation and float division +always convert integer operands to floats. +All other arithmetic operations applied to mixed numbers +(integers and floats) convert the integer operand to a float. +The C API also converts both integers to floats and +floats to integers, as needed. +Moreover, string concatenation accepts numbers as arguments, +besides strings. + + +

+In a conversion from integer to float, +if the integer value has an exact representation as a float, +that is the result. +Otherwise, +the conversion gets the nearest higher or +the nearest lower representable value. +This kind of conversion never fails. + + +

+The conversion from float to integer +checks whether the float has an exact representation as an integer +(that is, the float has an integral value and +it is in the range of integer representation). +If it does, that representation is the result. +Otherwise, the conversion fails. + + +

+Several places in Lua coerce strings to numbers when necessary. +In particular, +the string library sets metamethods that try to coerce +strings to numbers in all arithmetic operations. +If the conversion fails, +the library calls the metamethod of the other operand +(if present) or it raises an error. +Note that bitwise operators do not do this coercion. + + +

+It is always a good practice not to rely on the +implicit coercions from strings to numbers, +as they are not always applied; +in particular, "1"==1 is false and "1"<1 raises an error +(see §3.4.4). +These coercions exist mainly for compatibility and may be removed +in future versions of the language. + + +

+A string is converted to an integer or a float +following its syntax and the rules of the Lua lexer. +The string may have also leading and trailing whitespaces and a sign. +All conversions from strings to numbers +accept both a dot and the current locale mark +as the radix character. +(The Lua lexer, however, accepts only a dot.) +If the string is not a valid numeral, +the conversion fails. +If necessary, the result of this first step is then converted +to a specific number subtype following the previous rules +for conversions between floats and integers. + + +

+The conversion from numbers to strings uses a +non-specified human-readable format. +To convert numbers to strings in any specific way, +use the function string.format. + + + + + +

3.4.4 – Relational Operators

+Lua supports the following relational operators: + +

    +
  • ==: equality
    • +
  • ~=: inequality
    • +
  • <: less than
    • +
  • >: greater than
    • +
  • <=: less or equal
    • +
  • >=: greater or equal
    • +

+These operators always result in false or true. + + +

+Equality (==) first compares the type of its operands. +If the types are different, then the result is false. +Otherwise, the values of the operands are compared. +Strings are equal if they have the same byte content. +Numbers are equal if they denote the same mathematical value. + + +

+Tables, userdata, and threads +are compared by reference: +two objects are considered equal only if they are the same object. +Every time you create a new object +(a table, a userdata, or a thread), +this new object is different from any previously existing object. +A function is always equal to itself. +Functions with any detectable difference +(different behavior, different definition) are always different. +Functions created at different times but with no detectable differences +may be classified as equal or not +(depending on internal caching details). + + +

+You can change the way that Lua compares tables and userdata +by using the __eq metamethod (see §2.4). + + +

+Equality comparisons do not convert strings to numbers +or vice versa. +Thus, "0"==0 evaluates to false, +and t[0] and t["0"] denote different +entries in a table. + + +

+The operator ~= is exactly the negation of equality (==). + + +

+The order operators work as follows. +If both arguments are numbers, +then they are compared according to their mathematical values, +regardless of their subtypes. +Otherwise, if both arguments are strings, +then their values are compared according to the current locale. +Otherwise, Lua tries to call the __lt or the __le +metamethod (see §2.4). +A comparison a > b is translated to b < a +and a >= b is translated to b <= a. + + +

+Following the IEEE 754 standard, +the special value NaN is considered neither less than, +nor equal to, nor greater than any value, including itself. + + + + + +

3.4.5 – Logical Operators

+The logical operators in Lua are +and, or, and not. +Like the control structures (see §3.3.4), +all logical operators consider both false and nil as false +and anything else as true. + + +

+The negation operator not always returns false or true. +The conjunction operator and returns its first argument +if this value is false or nil; +otherwise, and returns its second argument. +The disjunction operator or returns its first argument +if this value is different from nil and false; +otherwise, or returns its second argument. +Both and and or use short-circuit evaluation; +that is, +the second operand is evaluated only if necessary. +Here are some examples: + +

+     10 or 20            --> 10
+     10 or error()       --> 10
+     nil or "a"          --> "a"
+     nil and 10          --> nil
+     false and error()   --> false
+     false and nil       --> false
+     false or nil        --> nil
+     10 and 20           --> 20
+
+ + + + +

3.4.6 – Concatenation

+The string concatenation operator in Lua is +denoted by two dots ('..'). +If both operands are strings or numbers, +then the numbers are converted to strings +in a non-specified format (see §3.4.3). +Otherwise, the __concat metamethod is called (see §2.4). + + + + + +

3.4.7 – The Length Operator

+ +

+The length operator is denoted by the unary prefix operator #. + + +

+The length of a string is its number of bytes. +(That is the usual meaning of string length when each +character is one byte.) + + +

+The length operator applied on a table +returns a border in that table. +A border in a table t is any non-negative integer +that satisfies the following condition: + +

+     (border == 0 or t[border] ~= nil) and
+     (t[border + 1] == nil or border == math.maxinteger)
+

+In words, +a border is any positive integer index present in the table +that is followed by an absent index, +plus two limit cases: +zero, when index 1 is absent; +and the maximum value for an integer, when that index is present. +Note that keys that are not positive integers +do not interfere with borders. + + +

+A table with exactly one border is called a sequence. +For instance, the table {10, 20, 30, 40, 50} is a sequence, +as it has only one border (5). +The table {10, 20, 30, nil, 50} has two borders (3 and 5), +and therefore it is not a sequence. +(The nil at index 4 is called a hole.) +The table {nil, 20, 30, nil, nil, 60, nil} +has three borders (0, 3, and 6), +so it is not a sequence, too. +The table {} is a sequence with border 0. + + +

+When t is a sequence, +#t returns its only border, +which corresponds to the intuitive notion of the length of the sequence. +When t is not a sequence, +#t can return any of its borders. +(The exact one depends on details of +the internal representation of the table, +which in turn can depend on how the table was populated and +the memory addresses of its non-numeric keys.) + + +

+The computation of the length of a table +has a guaranteed worst time of O(log n), +where n is the largest integer key in the table. + + +

+A program can modify the behavior of the length operator for +any value but strings through the __len metamethod (see §2.4). + + + + + +

3.4.8 – Precedence

+Operator precedence in Lua follows the table below, +from lower to higher priority: + +

+     or
+     and
+     <     >     <=    >=    ~=    ==
+     |
+     ~
+     &
+     <<    >>
+     ..
+     +     -
+     *     /     //    %
+     unary operators (not   #     -     ~)
+     ^
+

+As usual, +you can use parentheses to change the precedences of an expression. +The concatenation ('..') and exponentiation ('^') +operators are right associative. +All other binary operators are left associative. + + + + + +

3.4.9 – Table Constructors

+Table constructors are expressions that create tables. +Every time a constructor is evaluated, a new table is created. +A constructor can be used to create an empty table +or to create a table and initialize some of its fields. +The general syntax for constructors is + +

+	tableconstructor ::= ‘{’ [fieldlist] ‘}’
+	fieldlist ::= field {fieldsep field} [fieldsep]
+	field ::= ‘[’ exp ‘]’ ‘=’ exp | Name ‘=’ exp | exp
+	fieldsep ::= ‘,’ | ‘;’
+
+ +

+Each field of the form [exp1] = exp2 adds to the new table an entry +with key exp1 and value exp2. +A field of the form name = exp is equivalent to +["name"] = exp. +Fields of the form exp are equivalent to +[i] = exp, where i are consecutive integers +starting with 1; +fields in the other formats do not affect this counting. +For example, + +

+     a = { [f(1)] = g; "x", "y"; x = 1, f(x), [30] = 23; 45 }
+

+is equivalent to + +

+     do
+       local t = {}
+       t[f(1)] = g
+       t[1] = "x"         -- 1st exp
+       t[2] = "y"         -- 2nd exp
+       t.x = 1            -- t["x"] = 1
+       t[3] = f(x)        -- 3rd exp
+       t[30] = 23
+       t[4] = 45          -- 4th exp
+       a = t
+     end
+
+ +

+The order of the assignments in a constructor is undefined. +(This order would be relevant only when there are repeated keys.) + + +

+If the last field in the list has the form exp +and the expression is a multires expression, +then all values returned by this expression enter the list consecutively +(see §3.4.12). + + +

+The field list can have an optional trailing separator, +as a convenience for machine-generated code. + + + + + +

3.4.10 – Function Calls

+A function call in Lua has the following syntax: + +

+	functioncall ::= prefixexp args
+

+In a function call, +first prefixexp and args are evaluated. +If the value of prefixexp has type function, +then this function is called +with the given arguments. +Otherwise, if present, +the prefixexp __call metamethod is called: +its first argument is the value of prefixexp, +followed by the original call arguments +(see §2.4). + + +

+The form + +

+	functioncall ::= prefixexp ‘:’ Name args
+

+can be used to emulate methods. +A call v:name(args) +is syntactic sugar for v.name(v,args), +except that v is evaluated only once. + + +

+Arguments have the following syntax: + +

+	args ::= ‘(’ [explist] ‘)’
+	args ::= tableconstructor
+	args ::= LiteralString
+

+All argument expressions are evaluated before the call. +A call of the form f{fields} is +syntactic sugar for f({fields}); +that is, the argument list is a single new table. +A call of the form f'string' +(or f"string" or f[[string]]) +is syntactic sugar for f('string'); +that is, the argument list is a single literal string. + + +

+A call of the form return functioncall not in the +scope of a to-be-closed variable is called a tail call. +Lua implements proper tail calls +(or proper tail recursion): +In a tail call, +the called function reuses the stack entry of the calling function. +Therefore, there is no limit on the number of nested tail calls that +a program can execute. +However, a tail call erases any debug information about the +calling function. +Note that a tail call only happens with a particular syntax, +where the return has one single function call as argument, +and it is outside the scope of any to-be-closed variable. +This syntax makes the calling function return exactly +the returns of the called function, +without any intervening action. +So, none of the following examples are tail calls: + +

+     return (f(x))        -- results adjusted to 1
+     return 2 * f(x)      -- result multiplied by 2
+     return x, f(x)       -- additional results
+     f(x); return         -- results discarded
+     return x or f(x)     -- results adjusted to 1
+
+ + + + +

3.4.11 – Function Definitions

+ +

+The syntax for function definition is + +

+	functiondef ::= function funcbody
+	funcbody ::= ‘(’ [parlist] ‘)’ block end
+
+ +

+The following syntactic sugar simplifies function definitions: + +

+	stat ::= function funcname funcbody
+	stat ::= local function Name funcbody
+	funcname ::= Name {‘.’ Name} [‘:’ Name]
+

+The statement + +

+     function f () body end
+

+translates to + +

+     f = function () body end
+

+The statement + +

+     function t.a.b.c.f () body end
+

+translates to + +

+     t.a.b.c.f = function () body end
+

+The statement + +

+     local function f () body end
+

+translates to + +

+     local f; f = function () body end
+

+not to + +

+     local f = function () body end
+

+(This only makes a difference when the body of the function +contains references to f.) + + +

+A function definition is an executable expression, +whose value has type function. +When Lua precompiles a chunk, +all its function bodies are precompiled too, +but they are not created yet. +Then, whenever Lua executes the function definition, +the function is instantiated (or closed). +This function instance, or closure, +is the final value of the expression. + + +

+Parameters act as local variables that are +initialized with the argument values: + +

+	parlist ::= namelist [‘,’ ‘...’] | ‘...’
+

+When a Lua function is called, +it adjusts its list of arguments to +the length of its list of parameters (see §3.4.12), +unless the function is a variadic function, +which is indicated by three dots ('...') +at the end of its parameter list. +A variadic function does not adjust its argument list; +instead, it collects all extra arguments and supplies them +to the function through a vararg expression, +which is also written as three dots. +The value of this expression is a list of all actual extra arguments, +similar to a function with multiple results (see §3.4.12). + + +

+As an example, consider the following definitions: + +

+     function f(a, b) end
+     function g(a, b, ...) end
+     function r() return 1,2,3 end
+

+Then, we have the following mapping from arguments to parameters and +to the vararg expression: + +

+     CALL             PARAMETERS
+     
+     f(3)             a=3, b=nil
+     f(3, 4)          a=3, b=4
+     f(3, 4, 5)       a=3, b=4
+     f(r(), 10)       a=1, b=10
+     f(r())           a=1, b=2
+     
+     g(3)             a=3, b=nil, ... -->  (nothing)
+     g(3, 4)          a=3, b=4,   ... -->  (nothing)
+     g(3, 4, 5, 8)    a=3, b=4,   ... -->  5  8
+     g(5, r())        a=5, b=1,   ... -->  2  3
+
+ +

+Results are returned using the return statement (see §3.3.4). +If control reaches the end of a function +without encountering a return statement, +then the function returns with no results. + + +

+ +There is a system-dependent limit on the number of values +that a function may return. +This limit is guaranteed to be greater than 1000. + + +

+The colon syntax +is used to emulate methods, +adding an implicit extra parameter self to the function. +Thus, the statement + +

+     function t.a.b.c:f (params) body end
+

+is syntactic sugar for + +

+     t.a.b.c.f = function (self, params) body end
+
+ + + + +

3.4.12 – Lists of expressions, multiple results, +and adjustment

+ +

+Both function calls and vararg expressions can result in multiple values. +These expressions are called multires expressions. + + +

+When a multires expression is used as the last element +of a list of expressions, +all results from the expression are added to the +list of values produced by the list of expressions. +Note that a single expression +in a place that expects a list of expressions +is the last expression in that (singleton) list. + + +

+These are the places where Lua expects a list of expressions: + +

    + +
  • A return statement, +for instance return e1, e2, e3 (see §3.3.4).
    • + +
  • A table constructor, +for instance {e1, e2, e3} (see §3.4.9).
    • + +
  • The arguments of a function call, +for instance foo(e1, e2, e3) (see §3.4.10).
    • + +
  • A multiple assignment, +for instance a , b, c = e1, e2, e3 (see §3.3.3).
    • + +
  • A local declaration, +for instance local a , b, c = e1, e2, e3 (see §3.3.7).
    • + +
  • The initial values in a generic for loop, +for instance for k in e1, e2, e3 do ... end (see §3.3.5).
    • + +

+In the last four cases, +the list of values from the list of expressions +must be adjusted to a specific length: +the number of parameters in a call to a non-variadic function +(see §3.4.11), +the number of variables in a multiple assignment or +a local declaration, +and exactly four values for a generic for loop. +The adjustment follows these rules: +If there are more values than needed, +the extra values are thrown away; +if there are fewer values than needed, +the list is extended with nil's. +When the list of expressions ends with a multires expression, +all results from that expression enter the list of values +before the adjustment. + + +

+When a multires expression is used +in a list of expressions without being the last element, +or in a place where the syntax expects a single expression, +Lua adjusts the result list of that expression to one element. +As a particular case, +the syntax expects a single expression inside a parenthesized expression; +therefore, adding parentheses around a multires expression +forces it to produce exactly one result. + + +

+We seldom need to use a vararg expression in a place +where the syntax expects a single expression. +(Usually it is simpler to add a regular parameter before +the variadic part and use that parameter.) +When there is such a need, +we recommend assigning the vararg expression +to a single variable and using that variable +in its place. + + +

+Here are some examples of uses of mutlres expressions. +In all cases, when the construction needs +"the n-th result" and there is no such result, +it uses a nil. + +

+     print(x, f())      -- prints x and all results from f().
+     print(x, (f()))    -- prints x and the first result from f().
+     print(f(), x)      -- prints the first result from f() and x.
+     print(1 + f())     -- prints 1 added to the first result from f().
+     local x = ...      -- x gets the first vararg argument.
+     x,y = ...          -- x gets the first vararg argument,
+                        -- y gets the second vararg argument.
+     x,y,z = w, f()     -- x gets w, y gets the first result from f(),
+                        -- z gets the second result from f().
+     x,y,z = f()        -- x gets the first result from f(),
+                        -- y gets the second result from f(),
+                        -- z gets the third result from f().
+     x,y,z = f(), g()   -- x gets the first result from f(),
+                        -- y gets the first result from g(),
+                        -- z gets the second result from g().
+     x,y,z = (f())      -- x gets the first result from f(), y and z get nil.
+     return f()         -- returns all results from f().
+     return x, ...      -- returns x and all received vararg arguments.
+     return x,y,f()     -- returns x, y, and all results from f().
+     {f()}              -- creates a list with all results from f().
+     {...}              -- creates a list with all vararg arguments.
+     {f(), 5}           -- creates a list with the first result from f() and 5.
+
+ + + + + + +

3.5 – Visibility Rules

+ +

+ +Lua is a lexically scoped language. +The scope of a local variable begins at the first statement after +its declaration and lasts until the last non-void statement +of the innermost block that includes the declaration. +(Void statements are labels and empty statements.) +Consider the following example: + +

+     x = 10                -- global variable
+     do                    -- new block
+       local x = x         -- new 'x', with value 10
+       print(x)            --> 10
+       x = x+1
+       do                  -- another block
+         local x = x+1     -- another 'x'
+         print(x)          --> 12
+       end
+       print(x)            --> 11
+     end
+     print(x)              --> 10  (the global one)
+
+ +

+Notice that, in a declaration like local x = x, +the new x being declared is not in scope yet, +and so the second x refers to the outside variable. + + +

+Because of the lexical scoping rules, +local variables can be freely accessed by functions +defined inside their scope. +A local variable used by an inner function is called an upvalue +(or external local variable, or simply external variable) +inside the inner function. + + +

+Notice that each execution of a local statement +defines new local variables. +Consider the following example: + +

+     a = {}
+     local x = 20
+     for i = 1, 10 do
+       local y = 0
+       a[i] = function () y = y + 1; return x + y end
+     end
+

+The loop creates ten closures +(that is, ten instances of the anonymous function). +Each of these closures uses a different y variable, +while all of them share the same x. + + + + + +

4 – The Application Program Interface

+ + + +

+ +This section describes the C API for Lua, that is, +the set of C functions available to the host program to communicate +with Lua. +All API functions and related types and constants +are declared in the header file lua.h. + + +

+Even when we use the term "function", +any facility in the API may be provided as a macro instead. +Except where stated otherwise, +all such macros use each of their arguments exactly once +(except for the first argument, which is always a Lua state), +and so do not generate any hidden side-effects. + + +

+As in most C libraries, +the Lua API functions do not check their arguments +for validity or consistency. +However, you can change this behavior by compiling Lua +with the macro LUA_USE_APICHECK defined. + + +

+The Lua library is fully reentrant: +it has no global variables. +It keeps all information it needs in a dynamic structure, +called the Lua state. + + +

+Each Lua state has one or more threads, +which correspond to independent, cooperative lines of execution. +The type lua_State (despite its name) refers to a thread. +(Indirectly, through the thread, it also refers to the +Lua state associated to the thread.) + + +

+A pointer to a thread must be passed as the first argument to +every function in the library, except to lua_newstate, +which creates a Lua state from scratch and returns a pointer +to the main thread in the new state. + + + + + +

4.1 – The Stack

+ + + +

+Lua uses a virtual stack to pass values to and from C. +Each element in this stack represents a Lua value +(nil, number, string, etc.). +Functions in the API can access this stack through the +Lua state parameter that they receive. + + +

+Whenever Lua calls C, the called function gets a new stack, +which is independent of previous stacks and of stacks of +C functions that are still active. +This stack initially contains any arguments to the C function +and it is where the C function can store temporary +Lua values and must push its results +to be returned to the caller (see lua_CFunction). + + +

+For convenience, +most query operations in the API do not follow a strict stack discipline. +Instead, they can refer to any element in the stack +by using an index: +A positive index represents an absolute stack position, +starting at 1 as the bottom of the stack; +a negative index represents an offset relative to the top of the stack. +More specifically, if the stack has n elements, +then index 1 represents the first element +(that is, the element that was pushed onto the stack first) +and +index n represents the last element; +index -1 also represents the last element +(that is, the element at the top) +and index -n represents the first element. + + + + + +

4.1.1 – Stack Size

+ +

+When you interact with the Lua API, +you are responsible for ensuring consistency. +In particular, +you are responsible for controlling stack overflow. +When you call any API function, +you must ensure the stack has enough room to accommodate the results. + + +

+There is one exception to the above rule: +When you call a Lua function +without a fixed number of results (see lua_call), +Lua ensures that the stack has enough space for all results. +However, it does not ensure any extra space. +So, before pushing anything on the stack after such a call +you should use lua_checkstack. + + +

+Whenever Lua calls C, +it ensures that the stack has space for +at least LUA_MINSTACK extra elements; +that is, you can safely push up to LUA_MINSTACK values into it. +LUA_MINSTACK is defined as 20, +so that usually you do not have to worry about stack space +unless your code has loops pushing elements onto the stack. +Whenever necessary, +you can use the function lua_checkstack +to ensure that the stack has enough space for pushing new elements. + + + + + +

4.1.2 – Valid and Acceptable Indices

+ +

+Any function in the API that receives stack indices +works only with valid indices or acceptable indices. + + +

+A valid index is an index that refers to a +position that stores a modifiable Lua value. +It comprises stack indices between 1 and the stack top +(1 ≤ abs(index) ≤ top) + +plus pseudo-indices, +which represent some positions that are accessible to C code +but that are not in the stack. +Pseudo-indices are used to access the registry (see §4.3) +and the upvalues of a C function (see §4.2). + + +

+Functions that do not need a specific mutable position, +but only a value (e.g., query functions), +can be called with acceptable indices. +An acceptable index can be any valid index, +but it also can be any positive index after the stack top +within the space allocated for the stack, +that is, indices up to the stack size. +(Note that 0 is never an acceptable index.) +Indices to upvalues (see §4.2) greater than the real number +of upvalues in the current C function are also acceptable (but invalid). +Except when noted otherwise, +functions in the API work with acceptable indices. + + +

+Acceptable indices serve to avoid extra tests +against the stack top when querying the stack. +For instance, a C function can query its third argument +without the need to check whether there is a third argument, +that is, without the need to check whether 3 is a valid index. + + +

+For functions that can be called with acceptable indices, +any non-valid index is treated as if it +contains a value of a virtual type LUA_TNONE, +which behaves like a nil value. + + + + + +

4.1.3 – Pointers to strings

+ +

+Several functions in the API return pointers (const char*) +to Lua strings in the stack. +(See lua_pushfstring, lua_pushlstring, +lua_pushstring, and lua_tolstring. +See also luaL_checklstring, luaL_checkstring, +and luaL_tolstring in the auxiliary library.) + + +

+In general, +Lua's garbage collection can free or move internal memory +and then invalidate pointers to internal strings. +To allow a safe use of these pointers, +the API guarantees that any pointer to a string in a stack index +is valid while the string value at that index is not removed from the stack. +(It can be moved to another index, though.) +When the index is a pseudo-index (referring to an upvalue), +the pointer is valid while the corresponding call is active and +the corresponding upvalue is not modified. + + +

+Some functions in the debug interface +also return pointers to strings, +namely lua_getlocal, lua_getupvalue, +lua_setlocal, and lua_setupvalue. +For these functions, the pointer is guaranteed to +be valid while the caller function is active and +the given closure (if one was given) is in the stack. + + +

+Except for these guarantees, +the garbage collector is free to invalidate +any pointer to internal strings. + + + + + + + +

4.2 – C Closures

+ +

+When a C function is created, +it is possible to associate some values with it, +thus creating a C closure +(see lua_pushcclosure); +these values are called upvalues and are +accessible to the function whenever it is called. + + +

+Whenever a C function is called, +its upvalues are located at specific pseudo-indices. +These pseudo-indices are produced by the macro +lua_upvalueindex. +The first upvalue associated with a function is at index +lua_upvalueindex(1), and so on. +Any access to lua_upvalueindex(n), +where n is greater than the number of upvalues of the +current function +(but not greater than 256, +which is one plus the maximum number of upvalues in a closure), +produces an acceptable but invalid index. + + +

+A C closure can also change the values +of its corresponding upvalues. + + + + + +

4.3 – Registry

+ +

+Lua provides a registry, +a predefined table that can be used by any C code to +store whatever Lua values it needs to store. +The registry table is always accessible at pseudo-index +LUA_REGISTRYINDEX. +Any C library can store data into this table, +but it must take care to choose keys +that are different from those used +by other libraries, to avoid collisions. +Typically, you should use as key a string containing your library name, +or a light userdata with the address of a C object in your code, +or any Lua object created by your code. +As with variable names, +string keys starting with an underscore followed by +uppercase letters are reserved for Lua. + + +

+The integer keys in the registry are used +by the reference mechanism (see luaL_ref) +and by some predefined values. +Therefore, integer keys in the registry +must not be used for other purposes. + + +

+When you create a new Lua state, +its registry comes with some predefined values. +These predefined values are indexed with integer keys +defined as constants in lua.h. +The following constants are defined: + +

    +
  • LUA_RIDX_MAINTHREAD: At this index the registry has +the main thread of the state. +(The main thread is the one created together with the state.) +
    • + +
  • LUA_RIDX_GLOBALS: At this index the registry has +the global environment. +
    • +
+ + + + +

4.4 – Error Handling in C

+ + + +

+Internally, Lua uses the C longjmp facility to handle errors. +(Lua will use exceptions if you compile it as C++; +search for LUAI_THROW in the source code for details.) +When Lua faces any error, +such as a memory allocation error or a type error, +it raises an error; +that is, it does a long jump. +A protected environment uses setjmp +to set a recovery point; +any error jumps to the most recent active recovery point. + + +

+Inside a C function you can raise an error explicitly +by calling lua_error. + + +

+Most functions in the API can raise an error, +for instance due to a memory allocation error. +The documentation for each function indicates whether +it can raise errors. + + +

+If an error happens outside any protected environment, +Lua calls a panic function (see lua_atpanic) +and then calls abort, +thus exiting the host application. +Your panic function can avoid this exit by +never returning +(e.g., doing a long jump to your own recovery point outside Lua). + + +

+The panic function, +as its name implies, +is a mechanism of last resort. +Programs should avoid it. +As a general rule, +when a C function is called by Lua with a Lua state, +it can do whatever it wants on that Lua state, +as it should be already protected. +However, +when C code operates on other Lua states +(e.g., a Lua-state argument to the function, +a Lua state stored in the registry, or +the result of lua_newthread), +it should use them only in API calls that cannot raise errors. + + +

+The panic function runs as if it were a message handler (see §2.3); +in particular, the error object is on the top of the stack. +However, there is no guarantee about stack space. +To push anything on the stack, +the panic function must first check the available space (see §4.1.1). + + + + + +

4.4.1 – Status Codes

+ +

+Several functions that report errors in the API use the following +status codes to indicate different kinds of errors or other conditions: + +

    + +
  • LUA_OK (0): no errors.
    • + +
  • LUA_ERRRUN: a runtime error.
    • + +
  • LUA_ERRMEM: +memory allocation error. +For such errors, Lua does not call the message handler. +
    • + +
  • LUA_ERRERR: error while running the message handler.
    • + +
  • LUA_ERRSYNTAX: syntax error during precompilation.
    • + +
  • LUA_YIELD: the thread (coroutine) yields.
    • + +
  • LUA_ERRFILE: a file-related error; +e.g., it cannot open or read the file.
    • + +

+These constants are defined in the header file lua.h. + + + + + + + +

4.5 – Handling Yields in C

+ +

+Internally, Lua uses the C longjmp facility to yield a coroutine. +Therefore, if a C function foo calls an API function +and this API function yields +(directly or indirectly by calling another function that yields), +Lua cannot return to foo any more, +because the longjmp removes its frame from the C stack. + + +

+To avoid this kind of problem, +Lua raises an error whenever it tries to yield across an API call, +except for three functions: +lua_yieldk, lua_callk, and lua_pcallk. +All those functions receive a continuation function +(as a parameter named k) to continue execution after a yield. + + +

+We need to set some terminology to explain continuations. +We have a C function called from Lua which we will call +the original function. +This original function then calls one of those three functions in the C API, +which we will call the callee function, +that then yields the current thread. +This can happen when the callee function is lua_yieldk, +or when the callee function is either lua_callk or lua_pcallk +and the function called by them yields. + + +

+Suppose the running thread yields while executing the callee function. +After the thread resumes, +it eventually will finish running the callee function. +However, +the callee function cannot return to the original function, +because its frame in the C stack was destroyed by the yield. +Instead, Lua calls a continuation function, +which was given as an argument to the callee function. +As the name implies, +the continuation function should continue the task +of the original function. + + +

+As an illustration, consider the following function: + +

+     int original_function (lua_State *L) {
+       ...     /* code 1 */
+       status = lua_pcall(L, n, m, h);  /* calls Lua */
+       ...     /* code 2 */
+     }
+

+Now we want to allow +the Lua code being run by lua_pcall to yield. +First, we can rewrite our function like here: + +

+     int k (lua_State *L, int status, lua_KContext ctx) {
+       ...  /* code 2 */
+     }
+     
+     int original_function (lua_State *L) {
+       ...     /* code 1 */
+       return k(L, lua_pcall(L, n, m, h), ctx);
+     }
+

+In the above code, +the new function k is a +continuation function (with type lua_KFunction), +which should do all the work that the original function +was doing after calling lua_pcall. +Now, we must inform Lua that it must call k if the Lua code +being executed by lua_pcall gets interrupted in some way +(errors or yielding), +so we rewrite the code as here, +replacing lua_pcall by lua_pcallk: + +

+     int original_function (lua_State *L) {
+       ...     /* code 1 */
+       return k(L, lua_pcallk(L, n, m, h, ctx2, k), ctx1);
+     }
+

+Note the external, explicit call to the continuation: +Lua will call the continuation only if needed, that is, +in case of errors or resuming after a yield. +If the called function returns normally without ever yielding, +lua_pcallk (and lua_callk) will also return normally. +(Of course, instead of calling the continuation in that case, +you can do the equivalent work directly inside the original function.) + + +

+Besides the Lua state, +the continuation function has two other parameters: +the final status of the call and the context value (ctx) that +was passed originally to lua_pcallk. +Lua does not use this context value; +it only passes this value from the original function to the +continuation function. +For lua_pcallk, +the status is the same value that would be returned by lua_pcallk, +except that it is LUA_YIELD when being executed after a yield +(instead of LUA_OK). +For lua_yieldk and lua_callk, +the status is always LUA_YIELD when Lua calls the continuation. +(For these two functions, +Lua will not call the continuation in case of errors, +because they do not handle errors.) +Similarly, when using lua_callk, +you should call the continuation function +with LUA_OK as the status. +(For lua_yieldk, there is not much point in calling +directly the continuation function, +because lua_yieldk usually does not return.) + + +

+Lua treats the continuation function as if it were the original function. +The continuation function receives the same Lua stack +from the original function, +in the same state it would be if the callee function had returned. +(For instance, +after a lua_callk the function and its arguments are +removed from the stack and replaced by the results from the call.) +It also has the same upvalues. +Whatever it returns is handled by Lua as if it were the return +of the original function. + + + + + +

4.6 – Functions and Types

+ +

+Here we list all functions and types from the C API in +alphabetical order. +Each function has an indicator like this: +[-o, +p, x] + + +

+The first field, o, +is how many elements the function pops from the stack. +The second field, p, +is how many elements the function pushes onto the stack. +(Any function always pushes its results after popping its arguments.) +A field in the form x|y means the function can push (or pop) +x or y elements, +depending on the situation; +an interrogation mark '?' means that +we cannot know how many elements the function pops/pushes +by looking only at its arguments. +(For instance, they may depend on what is in the stack.) +The third field, x, +tells whether the function may raise errors: +'-' means the function never raises any error; +'m' means the function may raise only out-of-memory errors; +'v' means the function may raise the errors explained in the text; +'e' means the function can run arbitrary Lua code, +either directly or through metamethods, +and therefore may raise any errors. + + + +

lua_absindex

+[-0, +0, –] +

int lua_absindex (lua_State *L, int idx);
+ +

+Converts the acceptable index idx +into an equivalent absolute index +(that is, one that does not depend on the stack size). + + + + + +

lua_Alloc

+
typedef void * (*lua_Alloc) (void *ud,
+                             void *ptr,
+                             size_t osize,
+                             size_t nsize);
+ +

+The type of the memory-allocation function used by Lua states. +The allocator function must provide a +functionality similar to realloc, +but not exactly the same. +Its arguments are +ud, an opaque pointer passed to lua_newstate; +ptr, a pointer to the block being allocated/reallocated/freed; +osize, the original size of the block or some code about what +is being allocated; +and nsize, the new size of the block. + + +

+When ptr is not NULL, +osize is the size of the block pointed by ptr, +that is, the size given when it was allocated or reallocated. + + +

+When ptr is NULL, +osize encodes the kind of object that Lua is allocating. +osize is any of +LUA_TSTRING, LUA_TTABLE, LUA_TFUNCTION, +LUA_TUSERDATA, or LUA_TTHREAD when (and only when) +Lua is creating a new object of that type. +When osize is some other value, +Lua is allocating memory for something else. + + +

+Lua assumes the following behavior from the allocator function: + + +

+When nsize is zero, +the allocator must behave like free +and then return NULL. + + +

+When nsize is not zero, +the allocator must behave like realloc. +In particular, the allocator returns NULL +if and only if it cannot fulfill the request. + + +

+Here is a simple implementation for the allocator function. +It is used in the auxiliary library by luaL_newstate. + +

+     static void *l_alloc (void *ud, void *ptr, size_t osize,
+                                                size_t nsize) {
+       (void)ud;  (void)osize;  /* not used */
+       if (nsize == 0) {
+         free(ptr);
+         return NULL;
+       }
+       else
+         return realloc(ptr, nsize);
+     }
+

+Note that ISO C ensures +that free(NULL) has no effect and that +realloc(NULL,size) is equivalent to malloc(size). + + + + + +

lua_arith

+[-(2|1), +1, e] +

void lua_arith (lua_State *L, int op);
+ +

+Performs an arithmetic or bitwise operation over the two values +(or one, in the case of negations) +at the top of the stack, +with the value on the top being the second operand, +pops these values, and pushes the result of the operation. +The function follows the semantics of the corresponding Lua operator +(that is, it may call metamethods). + + +

+The value of op must be one of the following constants: + +

+ + + + +

lua_atpanic

+[-0, +0, –] +

lua_CFunction lua_atpanic (lua_State *L, lua_CFunction panicf);
+ +

+Sets a new panic function and returns the old one (see §4.4). + + + + + +

lua_call

+[-(nargs+1), +nresults, e] +

void lua_call (lua_State *L, int nargs, int nresults);
+ +

+Calls a function. +Like regular Lua calls, +lua_call respects the __call metamethod. +So, here the word "function" +means any callable value. + + +

+To do a call you must use the following protocol: +first, the function to be called is pushed onto the stack; +then, the arguments to the call are pushed +in direct order; +that is, the first argument is pushed first. +Finally you call lua_call; +nargs is the number of arguments that you pushed onto the stack. +When the function returns, +all arguments and the function value are popped +and the call results are pushed onto the stack. +The number of results is adjusted to nresults, +unless nresults is LUA_MULTRET. +In this case, all results from the function are pushed; +Lua takes care that the returned values fit into the stack space, +but it does not ensure any extra space in the stack. +The function results are pushed onto the stack in direct order +(the first result is pushed first), +so that after the call the last result is on the top of the stack. + + +

+Any error while calling and running the function is propagated upwards +(with a longjmp). + + +

+The following example shows how the host program can do the +equivalent to this Lua code: + +

+     a = f("how", t.x, 14)
+

+Here it is in C: + +

+     lua_getglobal(L, "f");                  /* function to be called */
+     lua_pushliteral(L, "how");                       /* 1st argument */
+     lua_getglobal(L, "t");                    /* table to be indexed */
+     lua_getfield(L, -1, "x");        /* push result of t.x (2nd arg) */
+     lua_remove(L, -2);                  /* remove 't' from the stack */
+     lua_pushinteger(L, 14);                          /* 3rd argument */
+     lua_call(L, 3, 1);     /* call 'f' with 3 arguments and 1 result */
+     lua_setglobal(L, "a");                         /* set global 'a' */
+

+Note that the code above is balanced: +at its end, the stack is back to its original configuration. +This is considered good programming practice. + + + + + +

lua_callk

+[-(nargs + 1), +nresults, e] +

void lua_callk (lua_State *L,
+                int nargs,
+                int nresults,
+                lua_KContext ctx,
+                lua_KFunction k);
+ +

+This function behaves exactly like lua_call, +but allows the called function to yield (see §4.5). + + + + + +

lua_CFunction

+
typedef int (*lua_CFunction) (lua_State *L);
+ +

+Type for C functions. + + +

+In order to communicate properly with Lua, +a C function must use the following protocol, +which defines the way parameters and results are passed: +a C function receives its arguments from Lua in its stack +in direct order (the first argument is pushed first). +So, when the function starts, +lua_gettop(L) returns the number of arguments received by the function. +The first argument (if any) is at index 1 +and its last argument is at index lua_gettop(L). +To return values to Lua, a C function just pushes them onto the stack, +in direct order (the first result is pushed first), +and returns in C the number of results. +Any other value in the stack below the results will be properly +discarded by Lua. +Like a Lua function, a C function called by Lua can also return +many results. + + +

+As an example, the following function receives a variable number +of numeric arguments and returns their average and their sum: + +

+     static int foo (lua_State *L) {
+       int n = lua_gettop(L);    /* number of arguments */
+       lua_Number sum = 0.0;
+       int i;
+       for (i = 1; i <= n; i++) {
+         if (!lua_isnumber(L, i)) {
+           lua_pushliteral(L, "incorrect argument");
+           lua_error(L);
+         }
+         sum += lua_tonumber(L, i);
+       }
+       lua_pushnumber(L, sum/n);        /* first result */
+       lua_pushnumber(L, sum);         /* second result */
+       return 2;                   /* number of results */
+     }
+
+ + + + +

lua_checkstack

+[-0, +0, –] +

int lua_checkstack (lua_State *L, int n);
+ +

+Ensures that the stack has space for at least n extra elements, +that is, that you can safely push up to n values into it. +It returns false if it cannot fulfill the request, +either because it would cause the stack +to be greater than a fixed maximum size +(typically at least several thousand elements) or +because it cannot allocate memory for the extra space. +This function never shrinks the stack; +if the stack already has space for the extra elements, +it is left unchanged. + + + + + +

lua_close

+[-0, +0, –] +

void lua_close (lua_State *L);
+ +

+Close all active to-be-closed variables in the main thread, +release all objects in the given Lua state +(calling the corresponding garbage-collection metamethods, if any), +and frees all dynamic memory used by this state. + + +

+On several platforms, you may not need to call this function, +because all resources are naturally released when the host program ends. +On the other hand, long-running programs that create multiple states, +such as daemons or web servers, +will probably need to close states as soon as they are not needed. + + + + + +

lua_closeslot

+[-0, +0, e] +

void lua_closeslot (lua_State *L, int index);
+ +

+Close the to-be-closed slot at the given index and set its value to nil. +The index must be the last index previously marked to be closed +(see lua_toclose) that is still active (that is, not closed yet). + + +

+A __close metamethod cannot yield +when called through this function. + + +

+(This function was introduced in release 5.4.3.) + + + + + +

lua_closethread

+[-0, +?, –] +

int lua_closethread (lua_State *L, lua_State *from);
+ +

+Resets a thread, cleaning its call stack and closing all pending +to-be-closed variables. +Returns a status code: +LUA_OK for no errors in the thread +(either the original error that stopped the thread or +errors in closing methods), +or an error status otherwise. +In case of error, +leaves the error object on the top of the stack. + + +

+The parameter from represents the coroutine that is resetting L. +If there is no such coroutine, +this parameter can be NULL. + + +

+(This function was introduced in release 5.4.6.) + + + + + +

lua_compare

+[-0, +0, e] +

int lua_compare (lua_State *L, int index1, int index2, int op);
+ +

+Compares two Lua values. +Returns 1 if the value at index index1 satisfies op +when compared with the value at index index2, +following the semantics of the corresponding Lua operator +(that is, it may call metamethods). +Otherwise returns 0. +Also returns 0 if any of the indices is not valid. + + +

+The value of op must be one of the following constants: + +

    + +
  • LUA_OPEQ: compares for equality (==)
    • +
  • LUA_OPLT: compares for less than (<)
    • +
  • LUA_OPLE: compares for less or equal (<=)
    • + +
+ + + + +

lua_concat

+[-n, +1, e] +

void lua_concat (lua_State *L, int n);
+ +

+Concatenates the n values at the top of the stack, +pops them, and leaves the result on the top. +If n is 1, the result is the single value on the stack +(that is, the function does nothing); +if n is 0, the result is the empty string. +Concatenation is performed following the usual semantics of Lua +(see §3.4.6). + + + + + +

lua_copy

+[-0, +0, –] +

void lua_copy (lua_State *L, int fromidx, int toidx);
+ +

+Copies the element at index fromidx +into the valid index toidx, +replacing the value at that position. +Values at other positions are not affected. + + + + + +

lua_createtable

+[-0, +1, m] +

void lua_createtable (lua_State *L, int narr, int nrec);
+ +

+Creates a new empty table and pushes it onto the stack. +Parameter narr is a hint for how many elements the table +will have as a sequence; +parameter nrec is a hint for how many other elements +the table will have. +Lua may use these hints to preallocate memory for the new table. +This preallocation may help performance when you know in advance +how many elements the table will have. +Otherwise you can use the function lua_newtable. + + + + + +

lua_dump

+[-0, +0, –] +

int lua_dump (lua_State *L,
+                        lua_Writer writer,
+                        void *data,
+                        int strip);
+ +

+Dumps a function as a binary chunk. +Receives a Lua function on the top of the stack +and produces a binary chunk that, +if loaded again, +results in a function equivalent to the one dumped. +As it produces parts of the chunk, +lua_dump calls function writer (see lua_Writer) +with the given data +to write them. + + +

+If strip is true, +the binary representation may not include all debug information +about the function, +to save space. + + +

+The value returned is the error code returned by the last +call to the writer; +0 means no errors. + + +

+This function does not pop the Lua function from the stack. + + + + + +

lua_error

+[-1, +0, v] +

int lua_error (lua_State *L);
+ +

+Raises a Lua error, +using the value on the top of the stack as the error object. +This function does a long jump, +and therefore never returns +(see luaL_error). + + + + + +

lua_gc

+[-0, +0, –] +

int lua_gc (lua_State *L, int what, ...);
+ +

+Controls the garbage collector. + + +

+This function performs several tasks, +according to the value of the parameter what. +For options that need extra arguments, +they are listed after the option. + +

    + +
  • LUA_GCCOLLECT: +Performs a full garbage-collection cycle. +
    • + +
  • LUA_GCSTOP: +Stops the garbage collector. +
    • + +
  • LUA_GCRESTART: +Restarts the garbage collector. +
    • + +
  • LUA_GCCOUNT: +Returns the current amount of memory (in Kbytes) in use by Lua. +
    • + +
  • LUA_GCCOUNTB: +Returns the remainder of dividing the current amount of bytes of +memory in use by Lua by 1024. +
    • + +
  • LUA_GCSTEP (int stepsize): +Performs an incremental step of garbage collection, +corresponding to the allocation of stepsize Kbytes. +
    • + +
  • LUA_GCISRUNNING: +Returns a boolean that tells whether the collector is running +(i.e., not stopped). +
    • + +
  • LUA_GCINC (int pause, int stepmul, stepsize): +Changes the collector to incremental mode +with the given parameters (see §2.5.1). +Returns the previous mode (LUA_GCGEN or LUA_GCINC). +
    • + +
  • LUA_GCGEN (int minormul, int majormul): +Changes the collector to generational mode +with the given parameters (see §2.5.2). +Returns the previous mode (LUA_GCGEN or LUA_GCINC). +
    • + +

+For more details about these options, +see collectgarbage. + + +

+This function should not be called by a finalizer. + + + + + +

lua_getallocf

+[-0, +0, –] +

lua_Alloc lua_getallocf (lua_State *L, void **ud);
+ +

+Returns the memory-allocation function of a given state. +If ud is not NULL, Lua stores in *ud the +opaque pointer given when the memory-allocator function was set. + + + + + +

lua_getfield

+[-0, +1, e] +

int lua_getfield (lua_State *L, int index, const char *k);
+ +

+Pushes onto the stack the value t[k], +where t is the value at the given index. +As in Lua, this function may trigger a metamethod +for the "index" event (see §2.4). + + +

+Returns the type of the pushed value. + + + + + +

lua_getextraspace

+[-0, +0, –] +

void *lua_getextraspace (lua_State *L);
+ +

+Returns a pointer to a raw memory area associated with the +given Lua state. +The application can use this area for any purpose; +Lua does not use it for anything. + + +

+Each new thread has this area initialized with a copy +of the area of the main thread. + + +

+By default, this area has the size of a pointer to void, +but you can recompile Lua with a different size for this area. +(See LUA_EXTRASPACE in luaconf.h.) + + + + + +

lua_getglobal

+[-0, +1, e] +

int lua_getglobal (lua_State *L, const char *name);
+ +

+Pushes onto the stack the value of the global name. +Returns the type of that value. + + + + + +

lua_geti

+[-0, +1, e] +

int lua_geti (lua_State *L, int index, lua_Integer i);
+ +

+Pushes onto the stack the value t[i], +where t is the value at the given index. +As in Lua, this function may trigger a metamethod +for the "index" event (see §2.4). + + +

+Returns the type of the pushed value. + + + + + +

lua_getmetatable

+[-0, +(0|1), –] +

int lua_getmetatable (lua_State *L, int index);
+ +

+If the value at the given index has a metatable, +the function pushes that metatable onto the stack and returns 1. +Otherwise, +the function returns 0 and pushes nothing on the stack. + + + + + +

lua_gettable

+[-1, +1, e] +

int lua_gettable (lua_State *L, int index);
+ +

+Pushes onto the stack the value t[k], +where t is the value at the given index +and k is the value on the top of the stack. + + +

+This function pops the key from the stack, +pushing the resulting value in its place. +As in Lua, this function may trigger a metamethod +for the "index" event (see §2.4). + + +

+Returns the type of the pushed value. + + + + + +

lua_gettop

+[-0, +0, –] +

int lua_gettop (lua_State *L);
+ +

+Returns the index of the top element in the stack. +Because indices start at 1, +this result is equal to the number of elements in the stack; +in particular, 0 means an empty stack. + + + + + +

lua_getiuservalue

+[-0, +1, –] +

int lua_getiuservalue (lua_State *L, int index, int n);
+ +

+Pushes onto the stack the n-th user value associated with the +full userdata at the given index and +returns the type of the pushed value. + + +

+If the userdata does not have that value, +pushes nil and returns LUA_TNONE. + + + + + +

lua_insert

+[-1, +1, –] +

void lua_insert (lua_State *L, int index);
+ +

+Moves the top element into the given valid index, +shifting up the elements above this index to open space. +This function cannot be called with a pseudo-index, +because a pseudo-index is not an actual stack position. + + + + + +

lua_Integer

+
typedef ... lua_Integer;
+ +

+The type of integers in Lua. + + +

+By default this type is long long, +(usually a 64-bit two-complement integer), +but that can be changed to long or int +(usually a 32-bit two-complement integer). +(See LUA_INT_TYPE in luaconf.h.) + + +

+Lua also defines the constants +LUA_MININTEGER and LUA_MAXINTEGER, +with the minimum and the maximum values that fit in this type. + + + + + +

lua_isboolean

+[-0, +0, –] +

int lua_isboolean (lua_State *L, int index);
+ +

+Returns 1 if the value at the given index is a boolean, +and 0 otherwise. + + + + + +

lua_iscfunction

+[-0, +0, –] +

int lua_iscfunction (lua_State *L, int index);
+ +

+Returns 1 if the value at the given index is a C function, +and 0 otherwise. + + + + + +

lua_isfunction

+[-0, +0, –] +

int lua_isfunction (lua_State *L, int index);
+ +

+Returns 1 if the value at the given index is a function +(either C or Lua), and 0 otherwise. + + + + + +

lua_isinteger

+[-0, +0, –] +

int lua_isinteger (lua_State *L, int index);
+ +

+Returns 1 if the value at the given index is an integer +(that is, the value is a number and is represented as an integer), +and 0 otherwise. + + + + + +

lua_islightuserdata

+[-0, +0, –] +

int lua_islightuserdata (lua_State *L, int index);
+ +

+Returns 1 if the value at the given index is a light userdata, +and 0 otherwise. + + + + + +

lua_isnil

+[-0, +0, –] +

int lua_isnil (lua_State *L, int index);
+ +

+Returns 1 if the value at the given index is nil, +and 0 otherwise. + + + + + +

lua_isnone

+[-0, +0, –] +

int lua_isnone (lua_State *L, int index);
+ +

+Returns 1 if the given index is not valid, +and 0 otherwise. + + + + + +

lua_isnoneornil

+[-0, +0, –] +

int lua_isnoneornil (lua_State *L, int index);
+ +

+Returns 1 if the given index is not valid +or if the value at this index is nil, +and 0 otherwise. + + + + + +

lua_isnumber

+[-0, +0, –] +

int lua_isnumber (lua_State *L, int index);
+ +

+Returns 1 if the value at the given index is a number +or a string convertible to a number, +and 0 otherwise. + + + + + +

lua_isstring

+[-0, +0, –] +

int lua_isstring (lua_State *L, int index);
+ +

+Returns 1 if the value at the given index is a string +or a number (which is always convertible to a string), +and 0 otherwise. + + + + + +

lua_istable

+[-0, +0, –] +

int lua_istable (lua_State *L, int index);
+ +

+Returns 1 if the value at the given index is a table, +and 0 otherwise. + + + + + +

lua_isthread

+[-0, +0, –] +

int lua_isthread (lua_State *L, int index);
+ +

+Returns 1 if the value at the given index is a thread, +and 0 otherwise. + + + + + +

lua_isuserdata

+[-0, +0, –] +

int lua_isuserdata (lua_State *L, int index);
+ +

+Returns 1 if the value at the given index is a userdata +(either full or light), and 0 otherwise. + + + + + +

lua_isyieldable

+[-0, +0, –] +

int lua_isyieldable (lua_State *L);
+ +

+Returns 1 if the given coroutine can yield, +and 0 otherwise. + + + + + +

lua_KContext

+
typedef ... lua_KContext;
+ +

+The type for continuation-function contexts. +It must be a numeric type. +This type is defined as intptr_t +when intptr_t is available, +so that it can store pointers too. +Otherwise, it is defined as ptrdiff_t. + + + + + +

lua_KFunction

+
typedef int (*lua_KFunction) (lua_State *L, int status, lua_KContext ctx);
+ +

+Type for continuation functions (see §4.5). + + + + + +

lua_len

+[-0, +1, e] +

void lua_len (lua_State *L, int index);
+ +

+Returns the length of the value at the given index. +It is equivalent to the '#' operator in Lua (see §3.4.7) and +may trigger a metamethod for the "length" event (see §2.4). +The result is pushed on the stack. + + + + + +

lua_load

+[-0, +1, –] +

int lua_load (lua_State *L,
+              lua_Reader reader,
+              void *data,
+              const char *chunkname,
+              const char *mode);
+ +

+Loads a Lua chunk without running it. +If there are no errors, +lua_load pushes the compiled chunk as a Lua +function on top of the stack. +Otherwise, it pushes an error message. + + +

+The lua_load function uses a user-supplied reader function +to read the chunk (see lua_Reader). +The data argument is an opaque value passed to the reader function. + + +

+The chunkname argument gives a name to the chunk, +which is used for error messages and in debug information (see §4.7). + + +

+lua_load automatically detects whether the chunk is text or binary +and loads it accordingly (see program luac). +The string mode works as in function load, +with the addition that +a NULL value is equivalent to the string "bt". + + +

+lua_load uses the stack internally, +so the reader function must always leave the stack +unmodified when returning. + + +

+lua_load can return +LUA_OK, LUA_ERRSYNTAX, or LUA_ERRMEM. +The function may also return other values corresponding to +errors raised by the read function (see §4.4.1). + + +

+If the resulting function has upvalues, +its first upvalue is set to the value of the global environment +stored at index LUA_RIDX_GLOBALS in the registry (see §4.3). +When loading main chunks, +this upvalue will be the _ENV variable (see §2.2). +Other upvalues are initialized with nil. + + + + + +

lua_newstate

+[-0, +0, –] +

lua_State *lua_newstate (lua_Alloc f, void *ud);
+ +

+Creates a new independent state and returns its main thread. +Returns NULL if it cannot create the state +(due to lack of memory). +The argument f is the allocator function; +Lua will do all memory allocation for this state +through this function (see lua_Alloc). +The second argument, ud, is an opaque pointer that Lua +passes to the allocator in every call. + + + + + +

lua_newtable

+[-0, +1, m] +

void lua_newtable (lua_State *L);
+ +

+Creates a new empty table and pushes it onto the stack. +It is equivalent to lua_createtable(L, 0, 0). + + + + + +

lua_newthread

+[-0, +1, m] +

lua_State *lua_newthread (lua_State *L);
+ +

+Creates a new thread, pushes it on the stack, +and returns a pointer to a lua_State that represents this new thread. +The new thread returned by this function shares with the original thread +its global environment, +but has an independent execution stack. + + +

+Threads are subject to garbage collection, +like any Lua object. + + + + + +

lua_newuserdatauv

+[-0, +1, m] +

void *lua_newuserdatauv (lua_State *L, size_t size, int nuvalue);
+ +

+This function creates and pushes on the stack a new full userdata, +with nuvalue associated Lua values, called user values, +plus an associated block of raw memory with size bytes. +(The user values can be set and read with the functions +lua_setiuservalue and lua_getiuservalue.) + + +

+The function returns the address of the block of memory. +Lua ensures that this address is valid as long as +the corresponding userdata is alive (see §2.5). +Moreover, if the userdata is marked for finalization (see §2.5.3), +its address is valid at least until the call to its finalizer. + + + + + +

lua_next

+[-1, +(2|0), v] +

int lua_next (lua_State *L, int index);
+ +

+Pops a key from the stack, +and pushes a key–value pair from the table at the given index, +the "next" pair after the given key. +If there are no more elements in the table, +then lua_next returns 0 and pushes nothing. + + +

+A typical table traversal looks like this: + +

+     /* table is in the stack at index 't' */
+     lua_pushnil(L);  /* first key */
+     while (lua_next(L, t) != 0) {
+       /* uses 'key' (at index -2) and 'value' (at index -1) */
+       printf("%s - %s\n",
+              lua_typename(L, lua_type(L, -2)),
+              lua_typename(L, lua_type(L, -1)));
+       /* removes 'value'; keeps 'key' for next iteration */
+       lua_pop(L, 1);
+     }
+
+ +

+While traversing a table, +avoid calling lua_tolstring directly on a key, +unless you know that the key is actually a string. +Recall that lua_tolstring may change +the value at the given index; +this confuses the next call to lua_next. + + +

+This function may raise an error if the given key +is neither nil nor present in the table. +See function next for the caveats of modifying +the table during its traversal. + + + + + +

lua_Number

+
typedef ... lua_Number;
+ +

+The type of floats in Lua. + + +

+By default this type is double, +but that can be changed to a single float or a long double. +(See LUA_FLOAT_TYPE in luaconf.h.) + + + + + +

lua_numbertointeger

+
int lua_numbertointeger (lua_Number n, lua_Integer *p);
+ +

+Tries to convert a Lua float to a Lua integer; +the float n must have an integral value. +If that value is within the range of Lua integers, +it is converted to an integer and assigned to *p. +The macro results in a boolean indicating whether the +conversion was successful. +(Note that this range test can be tricky to do +correctly without this macro, due to rounding.) + + +

+This macro may evaluate its arguments more than once. + + + + + +

lua_pcall

+[-(nargs + 1), +(nresults|1), –] +

int lua_pcall (lua_State *L, int nargs, int nresults, int msgh);
+ +

+Calls a function (or a callable object) in protected mode. + + +

+Both nargs and nresults have the same meaning as +in lua_call. +If there are no errors during the call, +lua_pcall behaves exactly like lua_call. +However, if there is any error, +lua_pcall catches it, +pushes a single value on the stack (the error object), +and returns an error code. +Like lua_call, +lua_pcall always removes the function +and its arguments from the stack. + + +

+If msgh is 0, +then the error object returned on the stack +is exactly the original error object. +Otherwise, msgh is the stack index of a +message handler. +(This index cannot be a pseudo-index.) +In case of runtime errors, +this handler will be called with the error object +and its return value will be the object +returned on the stack by lua_pcall. + + +

+Typically, the message handler is used to add more debug +information to the error object, such as a stack traceback. +Such information cannot be gathered after the return of lua_pcall, +since by then the stack has unwound. + + +

+The lua_pcall function returns one of the following status codes: +LUA_OK, LUA_ERRRUN, LUA_ERRMEM, or LUA_ERRERR. + + + + + +

lua_pcallk

+[-(nargs + 1), +(nresults|1), –] +

int lua_pcallk (lua_State *L,
+                int nargs,
+                int nresults,
+                int msgh,
+                lua_KContext ctx,
+                lua_KFunction k);
+ +

+This function behaves exactly like lua_pcall, +except that it allows the called function to yield (see §4.5). + + + + + +

lua_pop

+[-n, +0, e] +

void lua_pop (lua_State *L, int n);
+ +

+Pops n elements from the stack. +It is implemented as a macro over lua_settop. + + + + + +

lua_pushboolean

+[-0, +1, –] +

void lua_pushboolean (lua_State *L, int b);
+ +

+Pushes a boolean value with value b onto the stack. + + + + + +

lua_pushcclosure

+[-n, +1, m] +

void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n);
+ +

+Pushes a new C closure onto the stack. +This function receives a pointer to a C function +and pushes onto the stack a Lua value of type function that, +when called, invokes the corresponding C function. +The parameter n tells how many upvalues this function will have +(see §4.2). + + +

+Any function to be callable by Lua must +follow the correct protocol to receive its parameters +and return its results (see lua_CFunction). + + +

+When a C function is created, +it is possible to associate some values with it, +the so called upvalues; +these upvalues are then accessible to the function whenever it is called. +This association is called a C closure (see §4.2). +To create a C closure, +first the initial values for its upvalues must be pushed onto the stack. +(When there are multiple upvalues, the first value is pushed first.) +Then lua_pushcclosure +is called to create and push the C function onto the stack, +with the argument n telling how many values will be +associated with the function. +lua_pushcclosure also pops these values from the stack. + + +

+The maximum value for n is 255. + + +

+When n is zero, +this function creates a light C function, +which is just a pointer to the C function. +In that case, it never raises a memory error. + + + + + +

lua_pushcfunction

+[-0, +1, –] +

void lua_pushcfunction (lua_State *L, lua_CFunction f);
+ +

+Pushes a C function onto the stack. +This function is equivalent to lua_pushcclosure with no upvalues. + + + + + +

lua_pushfstring

+[-0, +1, v] +

const char *lua_pushfstring (lua_State *L, const char *fmt, ...);
+ +

+Pushes onto the stack a formatted string +and returns a pointer to this string (see §4.1.3). +It is similar to the ISO C function sprintf, +but has two important differences. +First, +you do not have to allocate space for the result; +the result is a Lua string and Lua takes care of memory allocation +(and deallocation, through garbage collection). +Second, +the conversion specifiers are quite restricted. +There are no flags, widths, or precisions. +The conversion specifiers can only be +'%%' (inserts the character '%'), +'%s' (inserts a zero-terminated string, with no size restrictions), +'%f' (inserts a lua_Number), +'%I' (inserts a lua_Integer), +'%p' (inserts a pointer), +'%d' (inserts an int), +'%c' (inserts an int as a one-byte character), and +'%U' (inserts a long int as a UTF-8 byte sequence). + + +

+This function may raise errors due to memory overflow +or an invalid conversion specifier. + + + + + +

lua_pushglobaltable

+[-0, +1, –] +

void lua_pushglobaltable (lua_State *L);
+ +

+Pushes the global environment onto the stack. + + + + + +

lua_pushinteger

+[-0, +1, –] +

void lua_pushinteger (lua_State *L, lua_Integer n);
+ +

+Pushes an integer with value n onto the stack. + + + + + +

lua_pushlightuserdata

+[-0, +1, –] +

void lua_pushlightuserdata (lua_State *L, void *p);
+ +

+Pushes a light userdata onto the stack. + + +

+Userdata represent C values in Lua. +A light userdata represents a pointer, a void*. +It is a value (like a number): +you do not create it, it has no individual metatable, +and it is not collected (as it was never created). +A light userdata is equal to "any" +light userdata with the same C address. + + + + + +

lua_pushliteral

+[-0, +1, m] +

const char *lua_pushliteral (lua_State *L, const char *s);
+ +

+This macro is equivalent to lua_pushstring, +but should be used only when s is a literal string. +(Lua may optimize this case.) + + + + + +

lua_pushlstring

+[-0, +1, m] +

const char *lua_pushlstring (lua_State *L, const char *s, size_t len);
+ +

+Pushes the string pointed to by s with size len +onto the stack. +Lua will make or reuse an internal copy of the given string, +so the memory at s can be freed or reused immediately after +the function returns. +The string can contain any binary data, +including embedded zeros. + + +

+Returns a pointer to the internal copy of the string (see §4.1.3). + + + + + +

lua_pushnil

+[-0, +1, –] +

void lua_pushnil (lua_State *L);
+ +

+Pushes a nil value onto the stack. + + + + + +

lua_pushnumber

+[-0, +1, –] +

void lua_pushnumber (lua_State *L, lua_Number n);
+ +

+Pushes a float with value n onto the stack. + + + + + +

lua_pushstring

+[-0, +1, m] +

const char *lua_pushstring (lua_State *L, const char *s);
+ +

+Pushes the zero-terminated string pointed to by s +onto the stack. +Lua will make or reuse an internal copy of the given string, +so the memory at s can be freed or reused immediately after +the function returns. + + +

+Returns a pointer to the internal copy of the string (see §4.1.3). + + +

+If s is NULL, pushes nil and returns NULL. + + + + + +

lua_pushthread

+[-0, +1, –] +

int lua_pushthread (lua_State *L);
+ +

+Pushes the thread represented by L onto the stack. +Returns 1 if this thread is the main thread of its state. + + + + + +

lua_pushvalue

+[-0, +1, –] +

void lua_pushvalue (lua_State *L, int index);
+ +

+Pushes a copy of the element at the given index +onto the stack. + + + + + +

lua_pushvfstring

+[-0, +1, v] +

const char *lua_pushvfstring (lua_State *L,
+                              const char *fmt,
+                              va_list argp);
+ +

+Equivalent to lua_pushfstring, except that it receives a va_list +instead of a variable number of arguments. + + + + + +

lua_rawequal

+[-0, +0, –] +

int lua_rawequal (lua_State *L, int index1, int index2);
+ +

+Returns 1 if the two values in indices index1 and +index2 are primitively equal +(that is, equal without calling the __eq metamethod). +Otherwise returns 0. +Also returns 0 if any of the indices are not valid. + + + + + +

lua_rawget

+[-1, +1, –] +

int lua_rawget (lua_State *L, int index);
+ +

+Similar to lua_gettable, but does a raw access +(i.e., without metamethods). +The value at index must be a table. + + + + + +

lua_rawgeti

+[-0, +1, –] +

int lua_rawgeti (lua_State *L, int index, lua_Integer n);
+ +

+Pushes onto the stack the value t[n], +where t is the table at the given index. +The access is raw, +that is, it does not use the __index metavalue. + + +

+Returns the type of the pushed value. + + + + + +

lua_rawgetp

+[-0, +1, –] +

int lua_rawgetp (lua_State *L, int index, const void *p);
+ +

+Pushes onto the stack the value t[k], +where t is the table at the given index and +k is the pointer p represented as a light userdata. +The access is raw; +that is, it does not use the __index metavalue. + + +

+Returns the type of the pushed value. + + + + + +

lua_rawlen

+[-0, +0, –] +

lua_Unsigned lua_rawlen (lua_State *L, int index);
+ +

+Returns the raw "length" of the value at the given index: +for strings, this is the string length; +for tables, this is the result of the length operator ('#') +with no metamethods; +for userdata, this is the size of the block of memory allocated +for the userdata. +For other values, this call returns 0. + + + + + +

lua_rawset

+[-2, +0, m] +

void lua_rawset (lua_State *L, int index);
+ +

+Similar to lua_settable, but does a raw assignment +(i.e., without metamethods). +The value at index must be a table. + + + + + +

lua_rawseti

+[-1, +0, m] +

void lua_rawseti (lua_State *L, int index, lua_Integer i);
+ +

+Does the equivalent of t[i] = v, +where t is the table at the given index +and v is the value on the top of the stack. + + +

+This function pops the value from the stack. +The assignment is raw, +that is, it does not use the __newindex metavalue. + + + + + +

lua_rawsetp

+[-1, +0, m] +

void lua_rawsetp (lua_State *L, int index, const void *p);
+ +

+Does the equivalent of t[p] = v, +where t is the table at the given index, +p is encoded as a light userdata, +and v is the value on the top of the stack. + + +

+This function pops the value from the stack. +The assignment is raw, +that is, it does not use the __newindex metavalue. + + + + + +

lua_Reader

+
typedef const char * (*lua_Reader) (lua_State *L,
+                                    void *data,
+                                    size_t *size);
+ +

+The reader function used by lua_load. +Every time lua_load needs another piece of the chunk, +it calls the reader, +passing along its data parameter. +The reader must return a pointer to a block of memory +with a new piece of the chunk +and set size to the block size. +The block must exist until the reader function is called again. +To signal the end of the chunk, +the reader must return NULL or set size to zero. +The reader function may return pieces of any size greater than zero. + + + + + +

lua_register

+[-0, +0, e] +

void lua_register (lua_State *L, const char *name, lua_CFunction f);
+ +

+Sets the C function f as the new value of global name. +It is defined as a macro: + +

+     #define lua_register(L,n,f) \
+            (lua_pushcfunction(L, f), lua_setglobal(L, n))
+
+ + + + +

lua_remove

+[-1, +0, –] +

void lua_remove (lua_State *L, int index);
+ +

+Removes the element at the given valid index, +shifting down the elements above this index to fill the gap. +This function cannot be called with a pseudo-index, +because a pseudo-index is not an actual stack position. + + + + + +

lua_replace

+[-1, +0, –] +

void lua_replace (lua_State *L, int index);
+ +

+Moves the top element into the given valid index +without shifting any element +(therefore replacing the value at that given index), +and then pops the top element. + + + + + +

lua_resetthread

+[-0, +?, –] +

int lua_resetthread (lua_State *L);
+ +

+This function is deprecated; +it is equivalent to lua_closethread with +from being NULL. + + + + + +

lua_resume

+[-?, +?, –] +

int lua_resume (lua_State *L, lua_State *from, int nargs,
+                          int *nresults);
+ +

+Starts and resumes a coroutine in the given thread L. + + +

+To start a coroutine, +you push the main function plus any arguments +onto the empty stack of the thread. +then you call lua_resume, +with nargs being the number of arguments. +This call returns when the coroutine suspends or finishes its execution. +When it returns, +*nresults is updated and +the top of the stack contains +the *nresults values passed to lua_yield +or returned by the body function. +lua_resume returns +LUA_YIELD if the coroutine yields, +LUA_OK if the coroutine finishes its execution +without errors, +or an error code in case of errors (see §4.4.1). +In case of errors, +the error object is on the top of the stack. + + +

+To resume a coroutine, +you remove the *nresults yielded values from its stack, +push the values to be passed as results from yield, +and then call lua_resume. + + +

+The parameter from represents the coroutine that is resuming L. +If there is no such coroutine, +this parameter can be NULL. + + + + + +

lua_rotate

+[-0, +0, –] +

void lua_rotate (lua_State *L, int idx, int n);
+ +

+Rotates the stack elements between the valid index idx +and the top of the stack. +The elements are rotated n positions in the direction of the top, +for a positive n, +or -n positions in the direction of the bottom, +for a negative n. +The absolute value of n must not be greater than the size +of the slice being rotated. +This function cannot be called with a pseudo-index, +because a pseudo-index is not an actual stack position. + + + + + +

lua_setallocf

+[-0, +0, –] +

void lua_setallocf (lua_State *L, lua_Alloc f, void *ud);
+ +

+Changes the allocator function of a given state to f +with user data ud. + + + + + +

lua_setfield

+[-1, +0, e] +

void lua_setfield (lua_State *L, int index, const char *k);
+ +

+Does the equivalent to t[k] = v, +where t is the value at the given index +and v is the value on the top of the stack. + + +

+This function pops the value from the stack. +As in Lua, this function may trigger a metamethod +for the "newindex" event (see §2.4). + + + + + +

lua_setglobal

+[-1, +0, e] +

void lua_setglobal (lua_State *L, const char *name);
+ +

+Pops a value from the stack and +sets it as the new value of global name. + + + + + +

lua_seti

+[-1, +0, e] +

void lua_seti (lua_State *L, int index, lua_Integer n);
+ +

+Does the equivalent to t[n] = v, +where t is the value at the given index +and v is the value on the top of the stack. + + +

+This function pops the value from the stack. +As in Lua, this function may trigger a metamethod +for the "newindex" event (see §2.4). + + + + + +

lua_setiuservalue

+[-1, +0, –] +

int lua_setiuservalue (lua_State *L, int index, int n);
+ +

+Pops a value from the stack and sets it as +the new n-th user value associated to the +full userdata at the given index. +Returns 0 if the userdata does not have that value. + + + + + +

lua_setmetatable

+[-1, +0, –] +

int lua_setmetatable (lua_State *L, int index);
+ +

+Pops a table or nil from the stack and +sets that value as the new metatable for the value at the given index. +(nil means no metatable.) + + +

+(For historical reasons, this function returns an int, +which now is always 1.) + + + + + +

lua_settable

+[-2, +0, e] +

void lua_settable (lua_State *L, int index);
+ +

+Does the equivalent to t[k] = v, +where t is the value at the given index, +v is the value on the top of the stack, +and k is the value just below the top. + + +

+This function pops both the key and the value from the stack. +As in Lua, this function may trigger a metamethod +for the "newindex" event (see §2.4). + + + + + +

lua_settop

+[-?, +?, e] +

void lua_settop (lua_State *L, int index);
+ +

+Accepts any index, or 0, +and sets the stack top to this index. +If the new top is greater than the old one, +then the new elements are filled with nil. +If index is 0, then all stack elements are removed. + + +

+This function can run arbitrary code when removing an index +marked as to-be-closed from the stack. + + + + + +

lua_setwarnf

+[-0, +0, –] +

void lua_setwarnf (lua_State *L, lua_WarnFunction f, void *ud);
+ +

+Sets the warning function to be used by Lua to emit warnings +(see lua_WarnFunction). +The ud parameter sets the value ud passed to +the warning function. + + + + + +

lua_State

+
typedef struct lua_State lua_State;
+ +

+An opaque structure that points to a thread and indirectly +(through the thread) to the whole state of a Lua interpreter. +The Lua library is fully reentrant: +it has no global variables. +All information about a state is accessible through this structure. + + +

+A pointer to this structure must be passed as the first argument to +every function in the library, except to lua_newstate, +which creates a Lua state from scratch. + + + + + +

lua_status

+[-0, +0, –] +

int lua_status (lua_State *L);
+ +

+Returns the status of the thread L. + + +

+The status can be LUA_OK for a normal thread, +an error code if the thread finished the execution +of a lua_resume with an error, +or LUA_YIELD if the thread is suspended. + + +

+You can call functions only in threads with status LUA_OK. +You can resume threads with status LUA_OK +(to start a new coroutine) or LUA_YIELD +(to resume a coroutine). + + + + + +

lua_stringtonumber

+[-0, +1, –] +

size_t lua_stringtonumber (lua_State *L, const char *s);
+ +

+Converts the zero-terminated string s to a number, +pushes that number into the stack, +and returns the total size of the string, +that is, its length plus one. +The conversion can result in an integer or a float, +according to the lexical conventions of Lua (see §3.1). +The string may have leading and trailing whitespaces and a sign. +If the string is not a valid numeral, +returns 0 and pushes nothing. +(Note that the result can be used as a boolean, +true if the conversion succeeds.) + + + + + +

lua_toboolean

+[-0, +0, –] +

int lua_toboolean (lua_State *L, int index);
+ +

+Converts the Lua value at the given index to a C boolean +value (0 or 1). +Like all tests in Lua, +lua_toboolean returns true for any Lua value +different from false and nil; +otherwise it returns false. +(If you want to accept only actual boolean values, +use lua_isboolean to test the value's type.) + + + + + +

lua_tocfunction

+[-0, +0, –] +

lua_CFunction lua_tocfunction (lua_State *L, int index);
+ +

+Converts a value at the given index to a C function. +That value must be a C function; +otherwise, returns NULL. + + + + + +

lua_toclose

+[-0, +0, m] +

void lua_toclose (lua_State *L, int index);
+ +

+Marks the given index in the stack as a +to-be-closed slot (see §3.3.8). +Like a to-be-closed variable in Lua, +the value at that slot in the stack will be closed +when it goes out of scope. +Here, in the context of a C function, +to go out of scope means that the running function returns to Lua, +or there is an error, +or the slot is removed from the stack through +lua_settop or lua_pop, +or there is a call to lua_closeslot. +A slot marked as to-be-closed should not be removed from the stack +by any other function in the API except lua_settop or lua_pop, +unless previously deactivated by lua_closeslot. + + +

+This function should not be called for an index +that is equal to or below an active to-be-closed slot. + + +

+Note that, both in case of errors and of a regular return, +by the time the __close metamethod runs, +the C stack was already unwound, +so that any automatic C variable declared in the calling function +(e.g., a buffer) will be out of scope. + + + + + +

lua_tointeger

+[-0, +0, –] +

lua_Integer lua_tointeger (lua_State *L, int index);
+ +

+Equivalent to lua_tointegerx with isnum equal to NULL. + + + + + +

lua_tointegerx

+[-0, +0, –] +

lua_Integer lua_tointegerx (lua_State *L, int index, int *isnum);
+ +

+Converts the Lua value at the given index +to the signed integral type lua_Integer. +The Lua value must be an integer, +or a number or string convertible to an integer (see §3.4.3); +otherwise, lua_tointegerx returns 0. + + +

+If isnum is not NULL, +its referent is assigned a boolean value that +indicates whether the operation succeeded. + + + + + +

lua_tolstring

+[-0, +0, m] +

const char *lua_tolstring (lua_State *L, int index, size_t *len);
+ +

+Converts the Lua value at the given index to a C string. +If len is not NULL, +it sets *len with the string length. +The Lua value must be a string or a number; +otherwise, the function returns NULL. +If the value is a number, +then lua_tolstring also +changes the actual value in the stack to a string. +(This change confuses lua_next +when lua_tolstring is applied to keys during a table traversal.) + + +

+lua_tolstring returns a pointer +to a string inside the Lua state (see §4.1.3). +This string always has a zero ('\0') +after its last character (as in C), +but can contain other zeros in its body. + + + + + +

lua_tonumber

+[-0, +0, –] +

lua_Number lua_tonumber (lua_State *L, int index);
+ +

+Equivalent to lua_tonumberx with isnum equal to NULL. + + + + + +

lua_tonumberx

+[-0, +0, –] +

lua_Number lua_tonumberx (lua_State *L, int index, int *isnum);
+ +

+Converts the Lua value at the given index +to the C type lua_Number (see lua_Number). +The Lua value must be a number or a string convertible to a number +(see §3.4.3); +otherwise, lua_tonumberx returns 0. + + +

+If isnum is not NULL, +its referent is assigned a boolean value that +indicates whether the operation succeeded. + + + + + +

lua_topointer

+[-0, +0, –] +

const void *lua_topointer (lua_State *L, int index);
+ +

+Converts the value at the given index to a generic +C pointer (void*). +The value can be a userdata, a table, a thread, a string, or a function; +otherwise, lua_topointer returns NULL. +Different objects will give different pointers. +There is no way to convert the pointer back to its original value. + + +

+Typically this function is used only for hashing and debug information. + + + + + +

lua_tostring

+[-0, +0, m] +

const char *lua_tostring (lua_State *L, int index);
+ +

+Equivalent to lua_tolstring with len equal to NULL. + + + + + +

lua_tothread

+[-0, +0, –] +

lua_State *lua_tothread (lua_State *L, int index);
+ +

+Converts the value at the given index to a Lua thread +(represented as lua_State*). +This value must be a thread; +otherwise, the function returns NULL. + + + + + +

lua_touserdata

+[-0, +0, –] +

void *lua_touserdata (lua_State *L, int index);
+ +

+If the value at the given index is a full userdata, +returns its memory-block address. +If the value is a light userdata, +returns its value (a pointer). +Otherwise, returns NULL. + + + + + +

lua_type

+[-0, +0, –] +

int lua_type (lua_State *L, int index);
+ +

+Returns the type of the value in the given valid index, +or LUA_TNONE for a non-valid but acceptable index. +The types returned by lua_type are coded by the following constants +defined in lua.h: +LUA_TNIL, +LUA_TNUMBER, +LUA_TBOOLEAN, +LUA_TSTRING, +LUA_TTABLE, +LUA_TFUNCTION, +LUA_TUSERDATA, +LUA_TTHREAD, +and +LUA_TLIGHTUSERDATA. + + + + + +

lua_typename

+[-0, +0, –] +

const char *lua_typename (lua_State *L, int tp);
+ +

+Returns the name of the type encoded by the value tp, +which must be one the values returned by lua_type. + + + + + +

lua_Unsigned

+
typedef ... lua_Unsigned;
+ +

+The unsigned version of lua_Integer. + + + + + +

lua_upvalueindex

+[-0, +0, –] +

int lua_upvalueindex (int i);
+ +

+Returns the pseudo-index that represents the i-th upvalue of +the running function (see §4.2). +i must be in the range [1,256]. + + + + + +

lua_version

+[-0, +0, –] +

lua_Number lua_version (lua_State *L);
+ +

+Returns the version number of this core. + + + + + +

lua_WarnFunction

+
typedef void (*lua_WarnFunction) (void *ud, const char *msg, int tocont);
+ +

+The type of warning functions, called by Lua to emit warnings. +The first parameter is an opaque pointer +set by lua_setwarnf. +The second parameter is the warning message. +The third parameter is a boolean that +indicates whether the message is +to be continued by the message in the next call. + + +

+See warn for more details about warnings. + + + + + +

lua_warning

+[-0, +0, –] +

void lua_warning (lua_State *L, const char *msg, int tocont);
+ +

+Emits a warning with the given message. +A message in a call with tocont true should be +continued in another call to this function. + + +

+See warn for more details about warnings. + + + + + +

lua_Writer

+
typedef int (*lua_Writer) (lua_State *L,
+                           const void* p,
+                           size_t sz,
+                           void* ud);
+ +

+The type of the writer function used by lua_dump. +Every time lua_dump produces another piece of chunk, +it calls the writer, +passing along the buffer to be written (p), +its size (sz), +and the ud parameter supplied to lua_dump. + + +

+The writer returns an error code: +0 means no errors; +any other value means an error and stops lua_dump from +calling the writer again. + + + + + +

lua_xmove

+[-?, +?, –] +

void lua_xmove (lua_State *from, lua_State *to, int n);
+ +

+Exchange values between different threads of the same state. + + +

+This function pops n values from the stack from, +and pushes them onto the stack to. + + + + + +

lua_yield

+[-?, +?, v] +

int lua_yield (lua_State *L, int nresults);
+ +

+This function is equivalent to lua_yieldk, +but it has no continuation (see §4.5). +Therefore, when the thread resumes, +it continues the function that called +the function calling lua_yield. +To avoid surprises, +this function should be called only in a tail call. + + + + + +

lua_yieldk

+[-?, +?, v] +

int lua_yieldk (lua_State *L,
+                int nresults,
+                lua_KContext ctx,
+                lua_KFunction k);
+ +

+Yields a coroutine (thread). + + +

+When a C function calls lua_yieldk, +the running coroutine suspends its execution, +and the call to lua_resume that started this coroutine returns. +The parameter nresults is the number of values from the stack +that will be passed as results to lua_resume. + + +

+When the coroutine is resumed again, +Lua calls the given continuation function k to continue +the execution of the C function that yielded (see §4.5). +This continuation function receives the same stack +from the previous function, +with the n results removed and +replaced by the arguments passed to lua_resume. +Moreover, +the continuation function receives the value ctx +that was passed to lua_yieldk. + + +

+Usually, this function does not return; +when the coroutine eventually resumes, +it continues executing the continuation function. +However, there is one special case, +which is when this function is called +from inside a line or a count hook (see §4.7). +In that case, lua_yieldk should be called with no continuation +(probably in the form of lua_yield) and no results, +and the hook should return immediately after the call. +Lua will yield and, +when the coroutine resumes again, +it will continue the normal execution +of the (Lua) function that triggered the hook. + + +

+This function can raise an error if it is called from a thread +with a pending C call with no continuation function +(what is called a C-call boundary), +or it is called from a thread that is not running inside a resume +(typically the main thread). + + + + + + + +

4.7 – The Debug Interface

+ +

+Lua has no built-in debugging facilities. +Instead, it offers a special interface +by means of functions and hooks. +This interface allows the construction of different +kinds of debuggers, profilers, and other tools +that need "inside information" from the interpreter. + + + +

lua_Debug

+
typedef struct lua_Debug {
+  int event;
+  const char *name;           /* (n) */
+  const char *namewhat;       /* (n) */
+  const char *what;           /* (S) */
+  const char *source;         /* (S) */
+  size_t srclen;              /* (S) */
+  int currentline;            /* (l) */
+  int linedefined;            /* (S) */
+  int lastlinedefined;        /* (S) */
+  unsigned char nups;         /* (u) number of upvalues */
+  unsigned char nparams;      /* (u) number of parameters */
+  char isvararg;              /* (u) */
+  char istailcall;            /* (t) */
+  unsigned short ftransfer;   /* (r) index of first value transferred */
+  unsigned short ntransfer;   /* (r) number of transferred values */
+  char short_src[LUA_IDSIZE]; /* (S) */
+  /* private part */
+  other fields
+} lua_Debug;
+ +

+A structure used to carry different pieces of +information about a function or an activation record. +lua_getstack fills only the private part +of this structure, for later use. +To fill the other fields of lua_Debug with useful information, +you must call lua_getinfo with an appropriate parameter. +(Specifically, to get a field, +you must add the letter between parentheses in the field's comment +to the parameter what of lua_getinfo.) + + +

+The fields of lua_Debug have the following meaning: + +

    + +
  • source: +the source of the chunk that created the function. +If source starts with a '@', +it means that the function was defined in a file where +the file name follows the '@'. +If source starts with a '=', +the remainder of its contents describes the source in a user-dependent manner. +Otherwise, +the function was defined in a string where +source is that string. +
    • + +
  • srclen: +The length of the string source. +
    • + +
  • short_src: +a "printable" version of source, to be used in error messages. +
    • + +
  • linedefined: +the line number where the definition of the function starts. +
    • + +
  • lastlinedefined: +the line number where the definition of the function ends. +
    • + +
  • what: +the string "Lua" if the function is a Lua function, +"C" if it is a C function, +"main" if it is the main part of a chunk. +
    • + +
  • currentline: +the current line where the given function is executing. +When no line information is available, +currentline is set to -1. +
    • + +
  • name: +a reasonable name for the given function. +Because functions in Lua are first-class values, +they do not have a fixed name: +some functions can be the value of multiple global variables, +while others can be stored only in a table field. +The lua_getinfo function checks how the function was +called to find a suitable name. +If it cannot find a name, +then name is set to NULL. +
    • + +
  • namewhat: +explains the name field. +The value of namewhat can be +"global", "local", "method", +"field", "upvalue", or "" (the empty string), +according to how the function was called. +(Lua uses the empty string when no other option seems to apply.) +
    • + +
  • istailcall: +true if this function invocation was called by a tail call. +In this case, the caller of this level is not in the stack. +
    • + +
  • nups: +the number of upvalues of the function. +
    • + +
  • nparams: +the number of parameters of the function +(always 0 for C functions). +
    • + +
  • isvararg: +true if the function is a variadic function +(always true for C functions). +
    • + +
  • ftransfer: +the index in the stack of the first value being "transferred", +that is, parameters in a call or return values in a return. +(The other values are in consecutive indices.) +Using this index, you can access and modify these values +through lua_getlocal and lua_setlocal. +This field is only meaningful during a +call hook, denoting the first parameter, +or a return hook, denoting the first value being returned. +(For call hooks, this value is always 1.) +
    • + +
  • ntransfer: +The number of values being transferred (see previous item). +(For calls of Lua functions, +this value is always equal to nparams.) +
    • + +
+ + + + +

lua_gethook

+[-0, +0, –] +

lua_Hook lua_gethook (lua_State *L);
+ +

+Returns the current hook function. + + + + + +

lua_gethookcount

+[-0, +0, –] +

int lua_gethookcount (lua_State *L);
+ +

+Returns the current hook count. + + + + + +

lua_gethookmask

+[-0, +0, –] +

int lua_gethookmask (lua_State *L);
+ +

+Returns the current hook mask. + + + + + +

lua_getinfo

+[-(0|1), +(0|1|2), m] +

int lua_getinfo (lua_State *L, const char *what, lua_Debug *ar);
+ +

+Gets information about a specific function or function invocation. + + +

+To get information about a function invocation, +the parameter ar must be a valid activation record that was +filled by a previous call to lua_getstack or +given as argument to a hook (see lua_Hook). + + +

+To get information about a function, you push it onto the stack +and start the what string with the character '>'. +(In that case, +lua_getinfo pops the function from the top of the stack.) +For instance, to know in which line a function f was defined, +you can write the following code: + +

+     lua_Debug ar;
+     lua_getglobal(L, "f");  /* get global 'f' */
+     lua_getinfo(L, ">S", &ar);
+     printf("%d\n", ar.linedefined);
+
+ +

+Each character in the string what +selects some fields of the structure ar to be filled or +a value to be pushed on the stack. +(These characters are also documented in the declaration of +the structure lua_Debug, +between parentheses in the comments following each field.) + +

    + +
  • 'f': +pushes onto the stack the function that is +running at the given level; +
    • + +
  • 'l': fills in the field currentline; +
    • + +
  • 'n': fills in the fields name and namewhat; +
    • + +
  • 'r': fills in the fields ftransfer and ntransfer; +
    • + +
  • 'S': +fills in the fields source, short_src, +linedefined, lastlinedefined, and what; +
    • + +
  • 't': fills in the field istailcall; +
    • + +
  • 'u': fills in the fields +nups, nparams, and isvararg; +
    • + +
  • 'L': +pushes onto the stack a table whose indices are +the lines on the function with some associated code, +that is, the lines where you can put a break point. +(Lines with no code include empty lines and comments.) +If this option is given together with option 'f', +its table is pushed after the function. +This is the only option that can raise a memory error. +
    • + +
+ +

+This function returns 0 to signal an invalid option in what; +even then the valid options are handled correctly. + + + + + +

lua_getlocal

+[-0, +(0|1), –] +

const char *lua_getlocal (lua_State *L, const lua_Debug *ar, int n);
+ +

+Gets information about a local variable or a temporary value +of a given activation record or a given function. + + +

+In the first case, +the parameter ar must be a valid activation record that was +filled by a previous call to lua_getstack or +given as argument to a hook (see lua_Hook). +The index n selects which local variable to inspect; +see debug.getlocal for details about variable indices +and names. + + +

+lua_getlocal pushes the variable's value onto the stack +and returns its name. + + +

+In the second case, ar must be NULL and the function +to be inspected must be on the top of the stack. +In this case, only parameters of Lua functions are visible +(as there is no information about what variables are active) +and no values are pushed onto the stack. + + +

+Returns NULL (and pushes nothing) +when the index is greater than +the number of active local variables. + + + + + +

lua_getstack

+[-0, +0, –] +

int lua_getstack (lua_State *L, int level, lua_Debug *ar);
+ +

+Gets information about the interpreter runtime stack. + + +

+This function fills parts of a lua_Debug structure with +an identification of the activation record +of the function executing at a given level. +Level 0 is the current running function, +whereas level n+1 is the function that has called level n +(except for tail calls, which do not count in the stack). +When called with a level greater than the stack depth, +lua_getstack returns 0; +otherwise it returns 1. + + + + + +

lua_getupvalue

+[-0, +(0|1), –] +

const char *lua_getupvalue (lua_State *L, int funcindex, int n);
+ +

+Gets information about the n-th upvalue +of the closure at index funcindex. +It pushes the upvalue's value onto the stack +and returns its name. +Returns NULL (and pushes nothing) +when the index n is greater than the number of upvalues. + + +

+See debug.getupvalue for more information about upvalues. + + + + + +

lua_Hook

+
typedef void (*lua_Hook) (lua_State *L, lua_Debug *ar);
+ +

+Type for debugging hook functions. + + +

+Whenever a hook is called, its ar argument has its field +event set to the specific event that triggered the hook. +Lua identifies these events with the following constants: +LUA_HOOKCALL, LUA_HOOKRET, +LUA_HOOKTAILCALL, LUA_HOOKLINE, +and LUA_HOOKCOUNT. +Moreover, for line events, the field currentline is also set. +To get the value of any other field in ar, +the hook must call lua_getinfo. + + +

+For call events, event can be LUA_HOOKCALL, +the normal value, or LUA_HOOKTAILCALL, for a tail call; +in this case, there will be no corresponding return event. + + +

+While Lua is running a hook, it disables other calls to hooks. +Therefore, if a hook calls back Lua to execute a function or a chunk, +this execution occurs without any calls to hooks. + + +

+Hook functions cannot have continuations, +that is, they cannot call lua_yieldk, +lua_pcallk, or lua_callk with a non-null k. + + +

+Hook functions can yield under the following conditions: +Only count and line events can yield; +to yield, a hook function must finish its execution +calling lua_yield with nresults equal to zero +(that is, with no values). + + + + + +

lua_sethook

+[-0, +0, –] +

void lua_sethook (lua_State *L, lua_Hook f, int mask, int count);
+ +

+Sets the debugging hook function. + + +

+Argument f is the hook function. +mask specifies on which events the hook will be called: +it is formed by a bitwise OR of the constants +LUA_MASKCALL, +LUA_MASKRET, +LUA_MASKLINE, +and LUA_MASKCOUNT. +The count argument is only meaningful when the mask +includes LUA_MASKCOUNT. +For each event, the hook is called as explained below: + +

    + +
  • The call hook: is called when the interpreter calls a function. +The hook is called just after Lua enters the new function. +
    • + +
  • The return hook: is called when the interpreter returns from a function. +The hook is called just before Lua leaves the function. +
    • + +
  • The line hook: is called when the interpreter is about to +start the execution of a new line of code, +or when it jumps back in the code (even to the same line). +This event only happens while Lua is executing a Lua function. +
    • + +
  • The count hook: is called after the interpreter executes every +count instructions. +This event only happens while Lua is executing a Lua function. +
    • + +
+ +

+Hooks are disabled by setting mask to zero. + + + + + +

lua_setlocal

+[-(0|1), +0, –] +

const char *lua_setlocal (lua_State *L, const lua_Debug *ar, int n);
+ +

+Sets the value of a local variable of a given activation record. +It assigns the value on the top of the stack +to the variable and returns its name. +It also pops the value from the stack. + + +

+Returns NULL (and pops nothing) +when the index is greater than +the number of active local variables. + + +

+Parameters ar and n are as in the function lua_getlocal. + + + + + +

lua_setupvalue

+[-(0|1), +0, –] +

const char *lua_setupvalue (lua_State *L, int funcindex, int n);
+ +

+Sets the value of a closure's upvalue. +It assigns the value on the top of the stack +to the upvalue and returns its name. +It also pops the value from the stack. + + +

+Returns NULL (and pops nothing) +when the index n is greater than the number of upvalues. + + +

+Parameters funcindex and n are as in +the function lua_getupvalue. + + + + + +

lua_upvalueid

+[-0, +0, –] +

void *lua_upvalueid (lua_State *L, int funcindex, int n);
+ +

+Returns a unique identifier for the upvalue numbered n +from the closure at index funcindex. + + +

+These unique identifiers allow a program to check whether different +closures share upvalues. +Lua closures that share an upvalue +(that is, that access a same external local variable) +will return identical ids for those upvalue indices. + + +

+Parameters funcindex and n are as in +the function lua_getupvalue, +but n cannot be greater than the number of upvalues. + + + + + +

lua_upvaluejoin

+[-0, +0, –] +

void lua_upvaluejoin (lua_State *L, int funcindex1, int n1,
+                                    int funcindex2, int n2);
+ +

+Make the n1-th upvalue of the Lua closure at index funcindex1 +refer to the n2-th upvalue of the Lua closure at index funcindex2. + + + + + + + +

5 – The Auxiliary Library

+ + + +

+ +The auxiliary library provides several convenient functions +to interface C with Lua. +While the basic API provides the primitive functions for all +interactions between C and Lua, +the auxiliary library provides higher-level functions for some +common tasks. + + +

+All functions and types from the auxiliary library +are defined in header file lauxlib.h and +have a prefix luaL_. + + +

+All functions in the auxiliary library are built on +top of the basic API, +and so they provide nothing that cannot be done with that API. +Nevertheless, the use of the auxiliary library ensures +more consistency to your code. + + +

+Several functions in the auxiliary library use internally some +extra stack slots. +When a function in the auxiliary library uses less than five slots, +it does not check the stack size; +it simply assumes that there are enough slots. + + +

+Several functions in the auxiliary library are used to +check C function arguments. +Because the error message is formatted for arguments +(e.g., "bad argument #1"), +you should not use these functions for other stack values. + + +

+Functions called luaL_check* +always raise an error if the check is not satisfied. + + + + + +

5.1 – Functions and Types

+ +

+Here we list all functions and types from the auxiliary library +in alphabetical order. + + + +

luaL_addchar

+[-?, +?, m] +

void luaL_addchar (luaL_Buffer *B, char c);
+ +

+Adds the byte c to the buffer B +(see luaL_Buffer). + + + + + +

luaL_addgsub

+[-?, +?, m] +

const void luaL_addgsub (luaL_Buffer *B, const char *s,
+                         const char *p, const char *r);
+ +

+Adds a copy of the string s to the buffer B (see luaL_Buffer), +replacing any occurrence of the string p +with the string r. + + + + + +

luaL_addlstring

+[-?, +?, m] +

void luaL_addlstring (luaL_Buffer *B, const char *s, size_t l);
+ +

+Adds the string pointed to by s with length l to +the buffer B +(see luaL_Buffer). +The string can contain embedded zeros. + + + + + +

luaL_addsize

+[-?, +?, –] +

void luaL_addsize (luaL_Buffer *B, size_t n);
+ +

+Adds to the buffer B +a string of length n previously copied to the +buffer area (see luaL_prepbuffer). + + + + + +

luaL_addstring

+[-?, +?, m] +

void luaL_addstring (luaL_Buffer *B, const char *s);
+ +

+Adds the zero-terminated string pointed to by s +to the buffer B +(see luaL_Buffer). + + + + + +

luaL_addvalue

+[-?, +?, m] +

void luaL_addvalue (luaL_Buffer *B);
+ +

+Adds the value on the top of the stack +to the buffer B +(see luaL_Buffer). +Pops the value. + + +

+This is the only function on string buffers that can (and must) +be called with an extra element on the stack, +which is the value to be added to the buffer. + + + + + +

luaL_argcheck

+[-0, +0, v] +

void luaL_argcheck (lua_State *L,
+                    int cond,
+                    int arg,
+                    const char *extramsg);
+ +

+Checks whether cond is true. +If it is not, raises an error with a standard message (see luaL_argerror). + + + + + +

luaL_argerror

+[-0, +0, v] +

int luaL_argerror (lua_State *L, int arg, const char *extramsg);
+ +

+Raises an error reporting a problem with argument arg +of the C function that called it, +using a standard message +that includes extramsg as a comment: + +

+     bad argument #arg to 'funcname' (extramsg)
+

+This function never returns. + + + + + +

luaL_argexpected

+[-0, +0, v] +

void luaL_argexpected (lua_State *L,
+                       int cond,
+                       int arg,
+                       const char *tname);
+ +

+Checks whether cond is true. +If it is not, raises an error about the type of the argument arg +with a standard message (see luaL_typeerror). + + + + + +

luaL_Buffer

+
typedef struct luaL_Buffer luaL_Buffer;
+ +

+Type for a string buffer. + + +

+A string buffer allows C code to build Lua strings piecemeal. +Its pattern of use is as follows: + +

    + +
  • First declare a variable b of type luaL_Buffer.
    • + +
  • Then initialize it with a call luaL_buffinit(L, &b).
    • + +
  • +Then add string pieces to the buffer calling any of +the luaL_add* functions. +
    • + +
  • +Finish by calling luaL_pushresult(&b). +This call leaves the final string on the top of the stack. +
    • + +
+ +

+If you know beforehand the maximum size of the resulting string, +you can use the buffer like this: + +

    + +
  • First declare a variable b of type luaL_Buffer.
    • + +
  • Then initialize it and preallocate a space of +size sz with a call luaL_buffinitsize(L, &b, sz).
    • + +
  • Then produce the string into that space.
    • + +
  • +Finish by calling luaL_pushresultsize(&b, sz), +where sz is the total size of the resulting string +copied into that space (which may be less than or +equal to the preallocated size). +
    • + +
+ +

+During its normal operation, +a string buffer uses a variable number of stack slots. +So, while using a buffer, you cannot assume that you know where +the top of the stack is. +You can use the stack between successive calls to buffer operations +as long as that use is balanced; +that is, +when you call a buffer operation, +the stack is at the same level +it was immediately after the previous buffer operation. +(The only exception to this rule is luaL_addvalue.) +After calling luaL_pushresult, +the stack is back to its level when the buffer was initialized, +plus the final string on its top. + + + + + +

luaL_buffaddr

+[-0, +0, –] +

char *luaL_buffaddr (luaL_Buffer *B);
+ +

+Returns the address of the current content of buffer B +(see luaL_Buffer). +Note that any addition to the buffer may invalidate this address. + + + + + +

luaL_buffinit

+[-0, +?, –] +

void luaL_buffinit (lua_State *L, luaL_Buffer *B);
+ +

+Initializes a buffer B +(see luaL_Buffer). +This function does not allocate any space; +the buffer must be declared as a variable. + + + + + +

luaL_bufflen

+[-0, +0, –] +

size_t luaL_bufflen (luaL_Buffer *B);
+ +

+Returns the length of the current content of buffer B +(see luaL_Buffer). + + + + + +

luaL_buffinitsize

+[-?, +?, m] +

char *luaL_buffinitsize (lua_State *L, luaL_Buffer *B, size_t sz);
+ +

+Equivalent to the sequence +luaL_buffinit, luaL_prepbuffsize. + + + + + +

luaL_buffsub

+[-?, +?, –] +

void luaL_buffsub (luaL_Buffer *B, int n);
+ +

+Removes n bytes from the buffer B +(see luaL_Buffer). +The buffer must have at least that many bytes. + + + + + +

luaL_callmeta

+[-0, +(0|1), e] +

int luaL_callmeta (lua_State *L, int obj, const char *e);
+ +

+Calls a metamethod. + + +

+If the object at index obj has a metatable and this +metatable has a field e, +this function calls this field passing the object as its only argument. +In this case this function returns true and pushes onto the +stack the value returned by the call. +If there is no metatable or no metamethod, +this function returns false without pushing any value on the stack. + + + + + +

luaL_checkany

+[-0, +0, v] +

void luaL_checkany (lua_State *L, int arg);
+ +

+Checks whether the function has an argument +of any type (including nil) at position arg. + + + + + +

luaL_checkinteger

+[-0, +0, v] +

lua_Integer luaL_checkinteger (lua_State *L, int arg);
+ +

+Checks whether the function argument arg is an integer +(or can be converted to an integer) +and returns this integer. + + + + + +

luaL_checklstring

+[-0, +0, v] +

const char *luaL_checklstring (lua_State *L, int arg, size_t *l);
+ +

+Checks whether the function argument arg is a string +and returns this string; +if l is not NULL fills its referent +with the string's length. + + +

+This function uses lua_tolstring to get its result, +so all conversions and caveats of that function apply here. + + + + + +

luaL_checknumber

+[-0, +0, v] +

lua_Number luaL_checknumber (lua_State *L, int arg);
+ +

+Checks whether the function argument arg is a number +and returns this number converted to a lua_Number. + + + + + +

luaL_checkoption

+[-0, +0, v] +

int luaL_checkoption (lua_State *L,
+                      int arg,
+                      const char *def,
+                      const char *const lst[]);
+ +

+Checks whether the function argument arg is a string and +searches for this string in the array lst +(which must be NULL-terminated). +Returns the index in the array where the string was found. +Raises an error if the argument is not a string or +if the string cannot be found. + + +

+If def is not NULL, +the function uses def as a default value when +there is no argument arg or when this argument is nil. + + +

+This is a useful function for mapping strings to C enums. +(The usual convention in Lua libraries is +to use strings instead of numbers to select options.) + + + + + +

luaL_checkstack

+[-0, +0, v] +

void luaL_checkstack (lua_State *L, int sz, const char *msg);
+ +

+Grows the stack size to top + sz elements, +raising an error if the stack cannot grow to that size. +msg is an additional text to go into the error message +(or NULL for no additional text). + + + + + +

luaL_checkstring

+[-0, +0, v] +

const char *luaL_checkstring (lua_State *L, int arg);
+ +

+Checks whether the function argument arg is a string +and returns this string. + + +

+This function uses lua_tolstring to get its result, +so all conversions and caveats of that function apply here. + + + + + +

luaL_checktype

+[-0, +0, v] +

void luaL_checktype (lua_State *L, int arg, int t);
+ +

+Checks whether the function argument arg has type t. +See lua_type for the encoding of types for t. + + + + + +

luaL_checkudata

+[-0, +0, v] +

void *luaL_checkudata (lua_State *L, int arg, const char *tname);
+ +

+Checks whether the function argument arg is a userdata +of the type tname (see luaL_newmetatable) and +returns the userdata's memory-block address (see lua_touserdata). + + + + + +

luaL_checkversion

+[-0, +0, v] +

void luaL_checkversion (lua_State *L);
+ +

+Checks whether the code making the call and the Lua library being called +are using the same version of Lua and the same numeric types. + + + + + +

luaL_dofile

+[-0, +?, m] +

int luaL_dofile (lua_State *L, const char *filename);
+ +

+Loads and runs the given file. +It is defined as the following macro: + +

+     (luaL_loadfile(L, filename) || lua_pcall(L, 0, LUA_MULTRET, 0))
+

+It returns 0 (LUA_OK) if there are no errors, +or 1 in case of errors. + + + + + +

luaL_dostring

+[-0, +?, –] +

int luaL_dostring (lua_State *L, const char *str);
+ +

+Loads and runs the given string. +It is defined as the following macro: + +

+     (luaL_loadstring(L, str) || lua_pcall(L, 0, LUA_MULTRET, 0))
+

+It returns 0 (LUA_OK) if there are no errors, +or 1 in case of errors. + + + + + +

luaL_error

+[-0, +0, v] +

int luaL_error (lua_State *L, const char *fmt, ...);
+ +

+Raises an error. +The error message format is given by fmt +plus any extra arguments, +following the same rules of lua_pushfstring. +It also adds at the beginning of the message the file name and +the line number where the error occurred, +if this information is available. + + +

+This function never returns, +but it is an idiom to use it in C functions +as return luaL_error(args). + + + + + +

luaL_execresult

+[-0, +3, m] +

int luaL_execresult (lua_State *L, int stat);
+ +

+This function produces the return values for +process-related functions in the standard library +(os.execute and io.close). + + + + + +

luaL_fileresult

+[-0, +(1|3), m] +

int luaL_fileresult (lua_State *L, int stat, const char *fname);
+ +

+This function produces the return values for +file-related functions in the standard library +(io.open, os.rename, file:seek, etc.). + + + + + +

luaL_getmetafield

+[-0, +(0|1), m] +

int luaL_getmetafield (lua_State *L, int obj, const char *e);
+ +

+Pushes onto the stack the field e from the metatable +of the object at index obj and returns the type of the pushed value. +If the object does not have a metatable, +or if the metatable does not have this field, +pushes nothing and returns LUA_TNIL. + + + + + +

luaL_getmetatable

+[-0, +1, m] +

int luaL_getmetatable (lua_State *L, const char *tname);
+ +

+Pushes onto the stack the metatable associated with the name tname +in the registry (see luaL_newmetatable), +or nil if there is no metatable associated with that name. +Returns the type of the pushed value. + + + + + +

luaL_getsubtable

+[-0, +1, e] +

int luaL_getsubtable (lua_State *L, int idx, const char *fname);
+ +

+Ensures that the value t[fname], +where t is the value at index idx, +is a table, +and pushes that table onto the stack. +Returns true if it finds a previous table there +and false if it creates a new table. + + + + + +

luaL_gsub

+[-0, +1, m] +

const char *luaL_gsub (lua_State *L,
+                       const char *s,
+                       const char *p,
+                       const char *r);
+ +

+Creates a copy of string s, +replacing any occurrence of the string p +with the string r. +Pushes the resulting string on the stack and returns it. + + + + + +

luaL_len

+[-0, +0, e] +

lua_Integer luaL_len (lua_State *L, int index);
+ +

+Returns the "length" of the value at the given index +as a number; +it is equivalent to the '#' operator in Lua (see §3.4.7). +Raises an error if the result of the operation is not an integer. +(This case can only happen through metamethods.) + + + + + +

luaL_loadbuffer

+[-0, +1, –] +

int luaL_loadbuffer (lua_State *L,
+                     const char *buff,
+                     size_t sz,
+                     const char *name);
+ +

+Equivalent to luaL_loadbufferx with mode equal to NULL. + + + + + +

luaL_loadbufferx

+[-0, +1, –] +

int luaL_loadbufferx (lua_State *L,
+                      const char *buff,
+                      size_t sz,
+                      const char *name,
+                      const char *mode);
+ +

+Loads a buffer as a Lua chunk. +This function uses lua_load to load the chunk in the +buffer pointed to by buff with size sz. + + +

+This function returns the same results as lua_load. +name is the chunk name, +used for debug information and error messages. +The string mode works as in the function lua_load. + + + + + +

luaL_loadfile

+[-0, +1, m] +

int luaL_loadfile (lua_State *L, const char *filename);
+ +

+Equivalent to luaL_loadfilex with mode equal to NULL. + + + + + +

luaL_loadfilex

+[-0, +1, m] +

int luaL_loadfilex (lua_State *L, const char *filename,
+                                            const char *mode);
+ +

+Loads a file as a Lua chunk. +This function uses lua_load to load the chunk in the file +named filename. +If filename is NULL, +then it loads from the standard input. +The first line in the file is ignored if it starts with a #. + + +

+The string mode works as in the function lua_load. + + +

+This function returns the same results as lua_load +or LUA_ERRFILE for file-related errors. + + +

+As lua_load, this function only loads the chunk; +it does not run it. + + + + + +

luaL_loadstring

+[-0, +1, –] +

int luaL_loadstring (lua_State *L, const char *s);
+ +

+Loads a string as a Lua chunk. +This function uses lua_load to load the chunk in +the zero-terminated string s. + + +

+This function returns the same results as lua_load. + + +

+Also as lua_load, this function only loads the chunk; +it does not run it. + + + + + +

luaL_newlib

+[-0, +1, m] +

void luaL_newlib (lua_State *L, const luaL_Reg l[]);
+ +

+Creates a new table and registers there +the functions in the list l. + + +

+It is implemented as the following macro: + +

+     (luaL_newlibtable(L,l), luaL_setfuncs(L,l,0))
+

+The array l must be the actual array, +not a pointer to it. + + + + + +

luaL_newlibtable

+[-0, +1, m] +

void luaL_newlibtable (lua_State *L, const luaL_Reg l[]);
+ +

+Creates a new table with a size optimized +to store all entries in the array l +(but does not actually store them). +It is intended to be used in conjunction with luaL_setfuncs +(see luaL_newlib). + + +

+It is implemented as a macro. +The array l must be the actual array, +not a pointer to it. + + + + + +

luaL_newmetatable

+[-0, +1, m] +

int luaL_newmetatable (lua_State *L, const char *tname);
+ +

+If the registry already has the key tname, +returns 0. +Otherwise, +creates a new table to be used as a metatable for userdata, +adds to this new table the pair __name = tname, +adds to the registry the pair [tname] = new table, +and returns 1. + + +

+In both cases, +the function pushes onto the stack the final value associated +with tname in the registry. + + + + + +

luaL_newstate

+[-0, +0, –] +

lua_State *luaL_newstate (void);
+ +

+Creates a new Lua state. +It calls lua_newstate with an +allocator based on the ISO C allocation functions +and then sets a warning function and a panic function (see §4.4) +that print messages to the standard error output. + + +

+Returns the new state, +or NULL if there is a memory allocation error. + + + + + +

luaL_openlibs

+[-0, +0, e] +

void luaL_openlibs (lua_State *L);
+ +

+Opens all standard Lua libraries into the given state. + + + + + +

luaL_opt

+[-0, +0, –] +

T luaL_opt (L, func, arg, dflt);
+ +

+This macro is defined as follows: + +

+     (lua_isnoneornil(L,(arg)) ? (dflt) : func(L,(arg)))
+

+In words, if the argument arg is nil or absent, +the macro results in the default dflt. +Otherwise, it results in the result of calling func +with the state L and the argument index arg as +arguments. +Note that it evaluates the expression dflt only if needed. + + + + + +

luaL_optinteger

+[-0, +0, v] +

lua_Integer luaL_optinteger (lua_State *L,
+                             int arg,
+                             lua_Integer d);
+ +

+If the function argument arg is an integer +(or it is convertible to an integer), +returns this integer. +If this argument is absent or is nil, +returns d. +Otherwise, raises an error. + + + + + +

luaL_optlstring

+[-0, +0, v] +

const char *luaL_optlstring (lua_State *L,
+                             int arg,
+                             const char *d,
+                             size_t *l);
+ +

+If the function argument arg is a string, +returns this string. +If this argument is absent or is nil, +returns d. +Otherwise, raises an error. + + +

+If l is not NULL, +fills its referent with the result's length. +If the result is NULL +(only possible when returning d and d == NULL), +its length is considered zero. + + +

+This function uses lua_tolstring to get its result, +so all conversions and caveats of that function apply here. + + + + + +

luaL_optnumber

+[-0, +0, v] +

lua_Number luaL_optnumber (lua_State *L, int arg, lua_Number d);
+ +

+If the function argument arg is a number, +returns this number as a lua_Number. +If this argument is absent or is nil, +returns d. +Otherwise, raises an error. + + + + + +

luaL_optstring

+[-0, +0, v] +

const char *luaL_optstring (lua_State *L,
+                            int arg,
+                            const char *d);
+ +

+If the function argument arg is a string, +returns this string. +If this argument is absent or is nil, +returns d. +Otherwise, raises an error. + + + + + +

luaL_prepbuffer

+[-?, +?, m] +

char *luaL_prepbuffer (luaL_Buffer *B);
+ +

+Equivalent to luaL_prepbuffsize +with the predefined size LUAL_BUFFERSIZE. + + + + + +

luaL_prepbuffsize

+[-?, +?, m] +

char *luaL_prepbuffsize (luaL_Buffer *B, size_t sz);
+ +

+Returns an address to a space of size sz +where you can copy a string to be added to buffer B +(see luaL_Buffer). +After copying the string into this space you must call +luaL_addsize with the size of the string to actually add +it to the buffer. + + + + + +

luaL_pushfail

+[-0, +1, –] +

void luaL_pushfail (lua_State *L);
+ +

+Pushes the fail value onto the stack (see §6). + + + + + +

luaL_pushresult

+[-?, +1, m] +

void luaL_pushresult (luaL_Buffer *B);
+ +

+Finishes the use of buffer B leaving the final string on +the top of the stack. + + + + + +

luaL_pushresultsize

+[-?, +1, m] +

void luaL_pushresultsize (luaL_Buffer *B, size_t sz);
+ +

+Equivalent to the sequence luaL_addsize, luaL_pushresult. + + + + + +

luaL_ref

+[-1, +0, m] +

int luaL_ref (lua_State *L, int t);
+ +

+Creates and returns a reference, +in the table at index t, +for the object on the top of the stack (and pops the object). + + +

+A reference is a unique integer key. +As long as you do not manually add integer keys into the table t, +luaL_ref ensures the uniqueness of the key it returns. +You can retrieve an object referred by the reference r +by calling lua_rawgeti(L, t, r). +The function luaL_unref frees a reference. + + +

+If the object on the top of the stack is nil, +luaL_ref returns the constant LUA_REFNIL. +The constant LUA_NOREF is guaranteed to be different +from any reference returned by luaL_ref. + + + + + +

luaL_Reg

+
typedef struct luaL_Reg {
+  const char *name;
+  lua_CFunction func;
+} luaL_Reg;
+ +

+Type for arrays of functions to be registered by +luaL_setfuncs. +name is the function name and func is a pointer to +the function. +Any array of luaL_Reg must end with a sentinel entry +in which both name and func are NULL. + + + + + +

luaL_requiref

+[-0, +1, e] +

void luaL_requiref (lua_State *L, const char *modname,
+                    lua_CFunction openf, int glb);
+ +

+If package.loaded[modname] is not true, +calls the function openf with the string modname as an argument +and sets the call result to package.loaded[modname], +as if that function has been called through require. + + +

+If glb is true, +also stores the module into the global modname. + + +

+Leaves a copy of the module on the stack. + + + + + +

luaL_setfuncs

+[-nup, +0, m] +

void luaL_setfuncs (lua_State *L, const luaL_Reg *l, int nup);
+ +

+Registers all functions in the array l +(see luaL_Reg) into the table on the top of the stack +(below optional upvalues, see next). + + +

+When nup is not zero, +all functions are created with nup upvalues, +initialized with copies of the nup values +previously pushed on the stack +on top of the library table. +These values are popped from the stack after the registration. + + +

+A function with a NULL value represents a placeholder, +which is filled with false. + + + + + +

luaL_setmetatable

+[-0, +0, –] +

void luaL_setmetatable (lua_State *L, const char *tname);
+ +

+Sets the metatable of the object on the top of the stack +as the metatable associated with name tname +in the registry (see luaL_newmetatable). + + + + + +

luaL_Stream

+
typedef struct luaL_Stream {
+  FILE *f;
+  lua_CFunction closef;
+} luaL_Stream;
+ +

+The standard representation for file handles +used by the standard I/O library. + + +

+A file handle is implemented as a full userdata, +with a metatable called LUA_FILEHANDLE +(where LUA_FILEHANDLE is a macro with the actual metatable's name). +The metatable is created by the I/O library +(see luaL_newmetatable). + + +

+This userdata must start with the structure luaL_Stream; +it can contain other data after this initial structure. +The field f points to the corresponding C stream +(or it can be NULL to indicate an incompletely created handle). +The field closef points to a Lua function +that will be called to close the stream +when the handle is closed or collected; +this function receives the file handle as its sole argument and +must return either a true value, in case of success, +or a false value plus an error message, in case of error. +Once Lua calls this field, +it changes the field value to NULL +to signal that the handle is closed. + + + + + +

luaL_testudata

+[-0, +0, m] +

void *luaL_testudata (lua_State *L, int arg, const char *tname);
+ +

+This function works like luaL_checkudata, +except that, when the test fails, +it returns NULL instead of raising an error. + + + + + +

luaL_tolstring

+[-0, +1, e] +

const char *luaL_tolstring (lua_State *L, int idx, size_t *len);
+ +

+Converts any Lua value at the given index to a C string +in a reasonable format. +The resulting string is pushed onto the stack and also +returned by the function (see §4.1.3). +If len is not NULL, +the function also sets *len with the string length. + + +

+If the value has a metatable with a __tostring field, +then luaL_tolstring calls the corresponding metamethod +with the value as argument, +and uses the result of the call as its result. + + + + + +

luaL_traceback

+[-0, +1, m] +

void luaL_traceback (lua_State *L, lua_State *L1, const char *msg,
+                     int level);
+ +

+Creates and pushes a traceback of the stack L1. +If msg is not NULL, it is appended +at the beginning of the traceback. +The level parameter tells at which level +to start the traceback. + + + + + +

luaL_typeerror

+[-0, +0, v] +

int luaL_typeerror (lua_State *L, int arg, const char *tname);
+ +

+Raises a type error for the argument arg +of the C function that called it, +using a standard message; +tname is a "name" for the expected type. +This function never returns. + + + + + +

luaL_typename

+[-0, +0, –] +

const char *luaL_typename (lua_State *L, int index);
+ +

+Returns the name of the type of the value at the given index. + + + + + +

luaL_unref

+[-0, +0, –] +

void luaL_unref (lua_State *L, int t, int ref);
+ +

+Releases the reference ref from the table at index t +(see luaL_ref). +The entry is removed from the table, +so that the referred object can be collected. +The reference ref is also freed to be used again. + + +

+If ref is LUA_NOREF or LUA_REFNIL, +luaL_unref does nothing. + + + + + +

luaL_where

+[-0, +1, m] +

void luaL_where (lua_State *L, int lvl);
+ +

+Pushes onto the stack a string identifying the current position +of the control at level lvl in the call stack. +Typically this string has the following format: + +

+     chunkname:currentline:
+

+Level 0 is the running function, +level 1 is the function that called the running function, +etc. + + +

+This function is used to build a prefix for error messages. + + + + + + + +

6 – The Standard Libraries

+ + + +

+The standard Lua libraries provide useful functions +that are implemented in C through the C API. +Some of these functions provide essential services to the language +(e.g., type and getmetatable); +others provide access to outside services (e.g., I/O); +and others could be implemented in Lua itself, +but that for different reasons +deserve an implementation in C (e.g., table.sort). + + +

+All libraries are implemented through the official C API +and are provided as separate C modules. +Unless otherwise noted, +these library functions do not adjust its number of arguments +to its expected parameters. +For instance, a function documented as foo(arg) +should not be called without an argument. + + +

+The notation fail means a false value representing +some kind of failure. +(Currently, fail is equal to nil, +but that may change in future versions. +The recommendation is to always test the success of these functions +with (not status), instead of (status == nil).) + + +

+Currently, Lua has the following standard libraries: + +

    + +
  • basic library (§6.1);
    • + +
  • coroutine library (§6.2);
    • + +
  • package library (§6.3);
    • + +
  • string manipulation (§6.4);
    • + +
  • basic UTF-8 support (§6.5);
    • + +
  • table manipulation (§6.6);
    • + +
  • mathematical functions (§6.7) (sin, log, etc.);
    • + +
  • input and output (§6.8);
    • + +
  • operating system facilities (§6.9);
    • + +
  • debug facilities (§6.10).
    • + +

+Except for the basic and the package libraries, +each library provides all its functions as fields of a global table +or as methods of its objects. + + +

+To have access to these libraries, +the C host program should call the luaL_openlibs function, +which opens all standard libraries. +Alternatively, +the host program can open them individually by using +luaL_requiref to call +luaopen_base (for the basic library), +luaopen_package (for the package library), +luaopen_coroutine (for the coroutine library), +luaopen_string (for the string library), +luaopen_utf8 (for the UTF-8 library), +luaopen_table (for the table library), +luaopen_math (for the mathematical library), +luaopen_io (for the I/O library), +luaopen_os (for the operating system library), +and luaopen_debug (for the debug library). +These functions are declared in lualib.h. + + + + + +

6.1 – Basic Functions

+ +

+The basic library provides core functions to Lua. +If you do not include this library in your application, +you should check carefully whether you need to provide +implementations for some of its facilities. + + +

+

assert (v [, message])

+ + +

+Raises an error if +the value of its argument v is false (i.e., nil or false); +otherwise, returns all its arguments. +In case of error, +message is the error object; +when absent, it defaults to "assertion failed!" + + + + +

+

collectgarbage ([opt [, arg]])

+ + +

+This function is a generic interface to the garbage collector. +It performs different functions according to its first argument, opt: + +

    + +
  • "collect": +Performs a full garbage-collection cycle. +This is the default option. +
    • + +
  • "stop": +Stops automatic execution of the garbage collector. +The collector will run only when explicitly invoked, +until a call to restart it. +
    • + +
  • "restart": +Restarts automatic execution of the garbage collector. +
    • + +
  • "count": +Returns the total memory in use by Lua in Kbytes. +The value has a fractional part, +so that it multiplied by 1024 +gives the exact number of bytes in use by Lua. +
    • + +
  • "step": +Performs a garbage-collection step. +The step "size" is controlled by arg. +With a zero value, +the collector will perform one basic (indivisible) step. +For non-zero values, +the collector will perform as if that amount of memory +(in Kbytes) had been allocated by Lua. +Returns true if the step finished a collection cycle. +
    • + +
  • "isrunning": +Returns a boolean that tells whether the collector is running +(i.e., not stopped). +
    • + +
  • "incremental": +Change the collector mode to incremental. +This option can be followed by three numbers: +the garbage-collector pause, +the step multiplier, +and the step size (see §2.5.1). +A zero means to not change that value. +
    • + +
  • "generational": +Change the collector mode to generational. +This option can be followed by two numbers: +the garbage-collector minor multiplier +and the major multiplier (see §2.5.2). +A zero means to not change that value. +
    • + +

+See §2.5 for more details about garbage collection +and some of these options. + + +

+This function should not be called by a finalizer. + + + + +

+

dofile ([filename])

+Opens the named file and executes its content as a Lua chunk. +When called without arguments, +dofile executes the content of the standard input (stdin). +Returns all values returned by the chunk. +In case of errors, dofile propagates the error +to its caller. +(That is, dofile does not run in protected mode.) + + + + +

+

error (message [, level])

+Raises an error (see §2.3) with message as the error object. +This function never returns. + + +

+Usually, error adds some information about the error position +at the beginning of the message, if the message is a string. +The level argument specifies how to get the error position. +With level 1 (the default), the error position is where the +error function was called. +Level 2 points the error to where the function +that called error was called; and so on. +Passing a level 0 avoids the addition of error position information +to the message. + + + + +

+

_G

+A global variable (not a function) that +holds the global environment (see §2.2). +Lua itself does not use this variable; +changing its value does not affect any environment, +nor vice versa. + + + + +

+

getmetatable (object)

+ + +

+If object does not have a metatable, returns nil. +Otherwise, +if the object's metatable has a __metatable field, +returns the associated value. +Otherwise, returns the metatable of the given object. + + + + +

+

ipairs (t)

+ + +

+Returns three values (an iterator function, the table t, and 0) +so that the construction + +

+     for i,v in ipairs(t) do body end
+

+will iterate over the key–value pairs +(1,t[1]), (2,t[2]), ..., +up to the first absent index. + + + + +

+

load (chunk [, chunkname [, mode [, env]]])

+ + +

+Loads a chunk. + + +

+If chunk is a string, the chunk is this string. +If chunk is a function, +load calls it repeatedly to get the chunk pieces. +Each call to chunk must return a string that concatenates +with previous results. +A return of an empty string, nil, or no value signals the end of the chunk. + + +

+If there are no syntactic errors, +load returns the compiled chunk as a function; +otherwise, it returns fail plus the error message. + + +

+When you load a main chunk, +the resulting function will always have exactly one upvalue, +the _ENV variable (see §2.2). +However, +when you load a binary chunk created from a function (see string.dump), +the resulting function can have an arbitrary number of upvalues, +and there is no guarantee that its first upvalue will be +the _ENV variable. +(A non-main function may not even have an _ENV upvalue.) + + +

+Regardless, if the resulting function has any upvalues, +its first upvalue is set to the value of env, +if that parameter is given, +or to the value of the global environment. +Other upvalues are initialized with nil. +All upvalues are fresh, that is, +they are not shared with any other function. + + +

+chunkname is used as the name of the chunk for error messages +and debug information (see §4.7). +When absent, +it defaults to chunk, if chunk is a string, +or to "=(load)" otherwise. + + +

+The string mode controls whether the chunk can be text or binary +(that is, a precompiled chunk). +It may be the string "b" (only binary chunks), +"t" (only text chunks), +or "bt" (both binary and text). +The default is "bt". + + +

+It is safe to load malformed binary chunks; +load signals an appropriate error. +However, +Lua does not check the consistency of the code inside binary chunks; +running maliciously crafted bytecode can crash the interpreter. + + + + +

+

loadfile ([filename [, mode [, env]]])

+ + +

+Similar to load, +but gets the chunk from file filename +or from the standard input, +if no file name is given. + + + + +

+

next (table [, index])

+ + +

+Allows a program to traverse all fields of a table. +Its first argument is a table and its second argument +is an index in this table. +A call to next returns the next index of the table +and its associated value. +When called with nil as its second argument, +next returns an initial index +and its associated value. +When called with the last index, +or with nil in an empty table, +next returns nil. +If the second argument is absent, then it is interpreted as nil. +In particular, +you can use next(t) to check whether a table is empty. + + +

+The order in which the indices are enumerated is not specified, +even for numeric indices. +(To traverse a table in numerical order, +use a numerical for.) + + +

+You should not assign any value to a non-existent field in a table +during its traversal. +You may however modify existing fields. +In particular, you may set existing fields to nil. + + + + +

+

pairs (t)

+ + +

+If t has a metamethod __pairs, +calls it with t as argument and returns the first three +results from the call. + + +

+Otherwise, +returns three values: the next function, the table t, and nil, +so that the construction + +

+     for k,v in pairs(t) do body end
+

+will iterate over all key–value pairs of table t. + + +

+See function next for the caveats of modifying +the table during its traversal. + + + + +

+

pcall (f [, arg1, ···])

+ + +

+Calls the function f with +the given arguments in protected mode. +This means that any error inside f is not propagated; +instead, pcall catches the error +and returns a status code. +Its first result is the status code (a boolean), +which is true if the call succeeds without errors. +In such case, pcall also returns all results from the call, +after this first result. +In case of any error, pcall returns false plus the error object. +Note that errors caught by pcall do not call a message handler. + + + + +

+

print (···)

+Receives any number of arguments +and prints their values to stdout, +converting each argument to a string +following the same rules of tostring. + + +

+The function print is not intended for formatted output, +but only as a quick way to show a value, +for instance for debugging. +For complete control over the output, +use string.format and io.write. + + + + +

+

rawequal (v1, v2)

+Checks whether v1 is equal to v2, +without invoking the __eq metamethod. +Returns a boolean. + + + + +

+

rawget (table, index)

+Gets the real value of table[index], +without using the __index metavalue. +table must be a table; +index may be any value. + + + + +

+

rawlen (v)

+Returns the length of the object v, +which must be a table or a string, +without invoking the __len metamethod. +Returns an integer. + + + + +

+

rawset (table, index, value)

+Sets the real value of table[index] to value, +without using the __newindex metavalue. +table must be a table, +index any value different from nil and NaN, +and value any Lua value. + + +

+This function returns table. + + + + +

+

select (index, ···)

+ + +

+If index is a number, +returns all arguments after argument number index; +a negative number indexes from the end (-1 is the last argument). +Otherwise, index must be the string "#", +and select returns the total number of extra arguments it received. + + + + +

+

setmetatable (table, metatable)

+ + +

+Sets the metatable for the given table. +If metatable is nil, +removes the metatable of the given table. +If the original metatable has a __metatable field, +raises an error. + + +

+This function returns table. + + +

+To change the metatable of other types from Lua code, +you must use the debug library (§6.10). + + + + +

+

tonumber (e [, base])

+ + +

+When called with no base, +tonumber tries to convert its argument to a number. +If the argument is already a number or +a string convertible to a number, +then tonumber returns this number; +otherwise, it returns fail. + + +

+The conversion of strings can result in integers or floats, +according to the lexical conventions of Lua (see §3.1). +The string may have leading and trailing spaces and a sign. + + +

+When called with base, +then e must be a string to be interpreted as +an integer numeral in that base. +The base may be any integer between 2 and 36, inclusive. +In bases above 10, the letter 'A' (in either upper or lower case) +represents 10, 'B' represents 11, and so forth, +with 'Z' representing 35. +If the string e is not a valid numeral in the given base, +the function returns fail. + + + + +

+

tostring (v)

+ + +

+Receives a value of any type and +converts it to a string in a human-readable format. + + +

+If the metatable of v has a __tostring field, +then tostring calls the corresponding value +with v as argument, +and uses the result of the call as its result. +Otherwise, if the metatable of v has a __name field +with a string value, +tostring may use that string in its final result. + + +

+For complete control of how numbers are converted, +use string.format. + + + + +

+

type (v)

+ + +

+Returns the type of its only argument, coded as a string. +The possible results of this function are +"nil" (a string, not the value nil), +"number", +"string", +"boolean", +"table", +"function", +"thread", +and "userdata". + + + + +

+

_VERSION

+ + +

+A global variable (not a function) that +holds a string containing the running Lua version. +The current value of this variable is "Lua 5.4". + + + + +

+

warn (msg1, ···)

+ + +

+Emits a warning with a message composed by the concatenation +of all its arguments (which should be strings). + + +

+By convention, +a one-piece message starting with '@' +is intended to be a control message, +which is a message to the warning system itself. +In particular, the standard warning function in Lua +recognizes the control messages "@off", +to stop the emission of warnings, +and "@on", to (re)start the emission; +it ignores unknown control messages. + + + + +

+

xpcall (f, msgh [, arg1, ···])

+ + +

+This function is similar to pcall, +except that it sets a new message handler msgh. + + + + + + + +

6.2 – Coroutine Manipulation

+ +

+This library comprises the operations to manipulate coroutines, +which come inside the table coroutine. +See §2.6 for a general description of coroutines. + + +

+

coroutine.close (co)

+ + +

+Closes coroutine co, +that is, +closes all its pending to-be-closed variables +and puts the coroutine in a dead state. +The given coroutine must be dead or suspended. +In case of error +(either the original error that stopped the coroutine or +errors in closing methods), +returns false plus the error object; +otherwise returns true. + + + + +

+

coroutine.create (f)

+ + +

+Creates a new coroutine, with body f. +f must be a function. +Returns this new coroutine, +an object with type "thread". + + + + +

+

coroutine.isyieldable ([co])

+ + +

+Returns true when the coroutine co can yield. +The default for co is the running coroutine. + + +

+A coroutine is yieldable if it is not the main thread and +it is not inside a non-yieldable C function. + + + + +

+

coroutine.resume (co [, val1, ···])

+ + +

+Starts or continues the execution of coroutine co. +The first time you resume a coroutine, +it starts running its body. +The values val1, ... are passed +as the arguments to the body function. +If the coroutine has yielded, +resume restarts it; +the values val1, ... are passed +as the results from the yield. + + +

+If the coroutine runs without any errors, +resume returns true plus any values passed to yield +(when the coroutine yields) or any values returned by the body function +(when the coroutine terminates). +If there is any error, +resume returns false plus the error message. + + + + +

+

coroutine.running ()

+ + +

+Returns the running coroutine plus a boolean, +true when the running coroutine is the main one. + + + + +

+

coroutine.status (co)

+ + +

+Returns the status of the coroutine co, as a string: +"running", +if the coroutine is running +(that is, it is the one that called status); +"suspended", if the coroutine is suspended in a call to yield, +or if it has not started running yet; +"normal" if the coroutine is active but not running +(that is, it has resumed another coroutine); +and "dead" if the coroutine has finished its body function, +or if it has stopped with an error. + + + + +

+

coroutine.wrap (f)

+ + +

+Creates a new coroutine, with body f; +f must be a function. +Returns a function that resumes the coroutine each time it is called. +Any arguments passed to this function behave as the +extra arguments to resume. +The function returns the same values returned by resume, +except the first boolean. +In case of error, +the function closes the coroutine and propagates the error. + + + + +

+

coroutine.yield (···)

+ + +

+Suspends the execution of the calling coroutine. +Any arguments to yield are passed as extra results to resume. + + + + + + + +

6.3 – Modules

+ +

+The package library provides basic +facilities for loading modules in Lua. +It exports one function directly in the global environment: +require. +Everything else is exported in the table package. + + +

+

require (modname)

+ + +

+Loads the given module. +The function starts by looking into the package.loaded table +to determine whether modname is already loaded. +If it is, then require returns the value stored +at package.loaded[modname]. +(The absence of a second result in this case +signals that this call did not have to load the module.) +Otherwise, it tries to find a loader for the module. + + +

+To find a loader, +require is guided by the table package.searchers. +Each item in this table is a search function, +that searches for the module in a particular way. +By changing this table, +we can change how require looks for a module. +The following explanation is based on the default configuration +for package.searchers. + + +

+First require queries package.preload[modname]. +If it has a value, +this value (which must be a function) is the loader. +Otherwise require searches for a Lua loader using the +path stored in package.path. +If that also fails, it searches for a C loader using the +path stored in package.cpath. +If that also fails, +it tries an all-in-one loader (see package.searchers). + + +

+Once a loader is found, +require calls the loader with two arguments: +modname and an extra value, +a loader data, +also returned by the searcher. +The loader data can be any value useful to the module; +for the default searchers, +it indicates where the loader was found. +(For instance, if the loader came from a file, +this extra value is the file path.) +If the loader returns any non-nil value, +require assigns the returned value to package.loaded[modname]. +If the loader does not return a non-nil value and +has not assigned any value to package.loaded[modname], +then require assigns true to this entry. +In any case, require returns the +final value of package.loaded[modname]. +Besides that value, require also returns as a second result +the loader data returned by the searcher, +which indicates how require found the module. + + +

+If there is any error loading or running the module, +or if it cannot find any loader for the module, +then require raises an error. + + + + +

+

package.config

+ + +

+A string describing some compile-time configurations for packages. +This string is a sequence of lines: + +

    + +
  • The first line is the directory separator string. +Default is '\' for Windows and '/' for all other systems.
    • + +
  • The second line is the character that separates templates in a path. +Default is ';'.
    • + +
  • The third line is the string that marks the +substitution points in a template. +Default is '?'.
    • + +
  • The fourth line is a string that, in a path in Windows, +is replaced by the executable's directory. +Default is '!'.
    • + +
  • The fifth line is a mark to ignore all text after it +when building the luaopen_ function name. +Default is '-'.
    • + +
+ + + +

+

package.cpath

+ + +

+A string with the path used by require +to search for a C loader. + + +

+Lua initializes the C path package.cpath in the same way +it initializes the Lua path package.path, +using the environment variable LUA_CPATH_5_4, +or the environment variable LUA_CPATH, +or a default path defined in luaconf.h. + + + + +

+

package.loaded

+ + +

+A table used by require to control which +modules are already loaded. +When you require a module modname and +package.loaded[modname] is not false, +require simply returns the value stored there. + + +

+This variable is only a reference to the real table; +assignments to this variable do not change the +table used by require. +The real table is stored in the C registry (see §4.3), +indexed by the key LUA_LOADED_TABLE, a string. + + + + +

+

package.loadlib (libname, funcname)

+ + +

+Dynamically links the host program with the C library libname. + + +

+If funcname is "*", +then it only links with the library, +making the symbols exported by the library +available to other dynamically linked libraries. +Otherwise, +it looks for a function funcname inside the library +and returns this function as a C function. +So, funcname must follow the lua_CFunction prototype +(see lua_CFunction). + + +

+This is a low-level function. +It completely bypasses the package and module system. +Unlike require, +it does not perform any path searching and +does not automatically adds extensions. +libname must be the complete file name of the C library, +including if necessary a path and an extension. +funcname must be the exact name exported by the C library +(which may depend on the C compiler and linker used). + + +

+This functionality is not supported by ISO C. +As such, it is only available on some platforms +(Windows, Linux, Mac OS X, Solaris, BSD, +plus other Unix systems that support the dlfcn standard). + + +

+This function is inherently insecure, +as it allows Lua to call any function in any readable dynamic +library in the system. +(Lua calls any function assuming the function +has a proper prototype and respects a proper protocol +(see lua_CFunction). +Therefore, +calling an arbitrary function in an arbitrary dynamic library +more often than not results in an access violation.) + + + + +

+

package.path

+ + +

+A string with the path used by require +to search for a Lua loader. + + +

+At start-up, Lua initializes this variable with +the value of the environment variable LUA_PATH_5_4 or +the environment variable LUA_PATH or +with a default path defined in luaconf.h, +if those environment variables are not defined. +A ";;" in the value of the environment variable +is replaced by the default path. + + + + +

+

package.preload

+ + +

+A table to store loaders for specific modules +(see require). + + +

+This variable is only a reference to the real table; +assignments to this variable do not change the +table used by require. +The real table is stored in the C registry (see §4.3), +indexed by the key LUA_PRELOAD_TABLE, a string. + + + + +

+

package.searchers

+ + +

+A table used by require to control how to find modules. + + +

+Each entry in this table is a searcher function. +When looking for a module, +require calls each of these searchers in ascending order, +with the module name (the argument given to require) as its +sole argument. +If the searcher finds the module, +it returns another function, the module loader, +plus an extra value, a loader data, +that will be passed to that loader and +returned as a second result by require. +If it cannot find the module, +it returns a string explaining why +(or nil if it has nothing to say). + + +

+Lua initializes this table with four searcher functions. + + +

+The first searcher simply looks for a loader in the +package.preload table. + + +

+The second searcher looks for a loader as a Lua library, +using the path stored at package.path. +The search is done as described in function package.searchpath. + + +

+The third searcher looks for a loader as a C library, +using the path given by the variable package.cpath. +Again, +the search is done as described in function package.searchpath. +For instance, +if the C path is the string + +

+     "./?.so;./?.dll;/usr/local/?/init.so"
+

+the searcher for module foo +will try to open the files ./foo.so, ./foo.dll, +and /usr/local/foo/init.so, in that order. +Once it finds a C library, +this searcher first uses a dynamic link facility to link the +application with the library. +Then it tries to find a C function inside the library to +be used as the loader. +The name of this C function is the string "luaopen_" +concatenated with a copy of the module name where each dot +is replaced by an underscore. +Moreover, if the module name has a hyphen, +its suffix after (and including) the first hyphen is removed. +For instance, if the module name is a.b.c-v2.1, +the function name will be luaopen_a_b_c. + + +

+The fourth searcher tries an all-in-one loader. +It searches the C path for a library for +the root name of the given module. +For instance, when requiring a.b.c, +it will search for a C library for a. +If found, it looks into it for an open function for +the submodule; +in our example, that would be luaopen_a_b_c. +With this facility, a package can pack several C submodules +into one single library, +with each submodule keeping its original open function. + + +

+All searchers except the first one (preload) return as the extra value +the file path where the module was found, +as returned by package.searchpath. +The first searcher always returns the string ":preload:". + + +

+Searchers should raise no errors and have no side effects in Lua. +(They may have side effects in C, +for instance by linking the application with a library.) + + + + +

+

package.searchpath (name, path [, sep [, rep]])

+ + +

+Searches for the given name in the given path. + + +

+A path is a string containing a sequence of +templates separated by semicolons. +For each template, +the function replaces each interrogation mark (if any) +in the template with a copy of name +wherein all occurrences of sep +(a dot, by default) +were replaced by rep +(the system's directory separator, by default), +and then tries to open the resulting file name. + + +

+For instance, if the path is the string + +

+     "./?.lua;./?.lc;/usr/local/?/init.lua"
+

+the search for the name foo.a +will try to open the files +./foo/a.lua, ./foo/a.lc, and +/usr/local/foo/a/init.lua, in that order. + + +

+Returns the resulting name of the first file that it can +open in read mode (after closing the file), +or fail plus an error message if none succeeds. +(This error message lists all file names it tried to open.) + + + + + + + +

6.4 – String Manipulation

+ + + +

+This library provides generic functions for string manipulation, +such as finding and extracting substrings, and pattern matching. +When indexing a string in Lua, the first character is at position 1 +(not at 0, as in C). +Indices are allowed to be negative and are interpreted as indexing backwards, +from the end of the string. +Thus, the last character is at position -1, and so on. + + +

+The string library provides all its functions inside the table +string. +It also sets a metatable for strings +where the __index field points to the string table. +Therefore, you can use the string functions in object-oriented style. +For instance, string.byte(s,i) +can be written as s:byte(i). + + +

+The string library assumes one-byte character encodings. + + +

+

string.byte (s [, i [, j]])

+Returns the internal numeric codes of the characters s[i], +s[i+1], ..., s[j]. +The default value for i is 1; +the default value for j is i. +These indices are corrected +following the same rules of function string.sub. + + +

+Numeric codes are not necessarily portable across platforms. + + + + +

+

string.char (···)

+Receives zero or more integers. +Returns a string with length equal to the number of arguments, +in which each character has the internal numeric code equal +to its corresponding argument. + + +

+Numeric codes are not necessarily portable across platforms. + + + + +

+

string.dump (function [, strip])

+ + +

+Returns a string containing a binary representation +(a binary chunk) +of the given function, +so that a later load on this string returns +a copy of the function (but with new upvalues). +If strip is a true value, +the binary representation may not include all debug information +about the function, +to save space. + + +

+Functions with upvalues have only their number of upvalues saved. +When (re)loaded, +those upvalues receive fresh instances. +(See the load function for details about +how these upvalues are initialized. +You can use the debug library to serialize +and reload the upvalues of a function +in a way adequate to your needs.) + + + + +

+

string.find (s, pattern [, init [, plain]])

+ + +

+Looks for the first match of +pattern (see §6.4.1) in the string s. +If it finds a match, then find returns the indices of s +where this occurrence starts and ends; +otherwise, it returns fail. +A third, optional numeric argument init specifies +where to start the search; +its default value is 1 and can be negative. +A true as a fourth, optional argument plain +turns off the pattern matching facilities, +so the function does a plain "find substring" operation, +with no characters in pattern being considered magic. + + +

+If the pattern has captures, +then in a successful match +the captured values are also returned, +after the two indices. + + + + +

+

string.format (formatstring, ···)

+ + +

+Returns a formatted version of its variable number of arguments +following the description given in its first argument, +which must be a string. +The format string follows the same rules as the ISO C function sprintf. +The only differences are that the conversion specifiers and modifiers +F, n, *, h, L, and l are not supported +and that there is an extra specifier, q. +Both width and precision, when present, +are limited to two digits. + + +

+The specifier q formats booleans, nil, numbers, and strings +in a way that the result is a valid constant in Lua source code. +Booleans and nil are written in the obvious way +(true, false, nil). +Floats are written in hexadecimal, +to preserve full precision. +A string is written between double quotes, +using escape sequences when necessary to ensure that +it can safely be read back by the Lua interpreter. +For instance, the call + +

+     string.format('%q', 'a string with "quotes" and \n new line')
+

+may produce the string: + +

+     "a string with \"quotes\" and \
+      new line"
+

+This specifier does not support modifiers (flags, width, precision). + + +

+The conversion specifiers +A, a, E, e, f, +G, and g all expect a number as argument. +The specifiers c, d, +i, o, u, X, and x +expect an integer. +When Lua is compiled with a C89 compiler, +the specifiers A and a (hexadecimal floats) +do not support modifiers. + + +

+The specifier s expects a string; +if its argument is not a string, +it is converted to one following the same rules of tostring. +If the specifier has any modifier, +the corresponding string argument should not contain embedded zeros. + + +

+The specifier p formats the pointer +returned by lua_topointer. +That gives a unique string identifier for tables, userdata, +threads, strings, and functions. +For other values (numbers, nil, booleans), +this specifier results in a string representing +the pointer NULL. + + + + +

+

string.gmatch (s, pattern [, init])

+Returns an iterator function that, +each time it is called, +returns the next captures from pattern (see §6.4.1) +over the string s. +If pattern specifies no captures, +then the whole match is produced in each call. +A third, optional numeric argument init specifies +where to start the search; +its default value is 1 and can be negative. + + +

+As an example, the following loop +will iterate over all the words from string s, +printing one per line: + +

+     s = "hello world from Lua"
+     for w in string.gmatch(s, "%a+") do
+       print(w)
+     end
+

+The next example collects all pairs key=value from the +given string into a table: + +

+     t = {}
+     s = "from=world, to=Lua"
+     for k, v in string.gmatch(s, "(%w+)=(%w+)") do
+       t[k] = v
+     end
+
+ +

+For this function, a caret '^' at the start of a pattern does not +work as an anchor, as this would prevent the iteration. + + + + +

+

string.gsub (s, pattern, repl [, n])

+Returns a copy of s +in which all (or the first n, if given) +occurrences of the pattern (see §6.4.1) have been +replaced by a replacement string specified by repl, +which can be a string, a table, or a function. +gsub also returns, as its second value, +the total number of matches that occurred. +The name gsub comes from Global SUBstitution. + + +

+If repl is a string, then its value is used for replacement. +The character % works as an escape character: +any sequence in repl of the form %d, +with d between 1 and 9, +stands for the value of the d-th captured substring; +the sequence %0 stands for the whole match; +the sequence %% stands for a single %. + + +

+If repl is a table, then the table is queried for every match, +using the first capture as the key. + + +

+If repl is a function, then this function is called every time a +match occurs, with all captured substrings passed as arguments, +in order. + + +

+In any case, +if the pattern specifies no captures, +then it behaves as if the whole pattern was inside a capture. + + +

+If the value returned by the table query or by the function call +is a string or a number, +then it is used as the replacement string; +otherwise, if it is false or nil, +then there is no replacement +(that is, the original match is kept in the string). + + +

+Here are some examples: + +

+     x = string.gsub("hello world", "(%w+)", "%1 %1")
+     --> x="hello hello world world"
+     
+     x = string.gsub("hello world", "%w+", "%0 %0", 1)
+     --> x="hello hello world"
+     
+     x = string.gsub("hello world from Lua", "(%w+)%s*(%w+)", "%2 %1")
+     --> x="world hello Lua from"
+     
+     x = string.gsub("home = $HOME, user = $USER", "%$(%w+)", os.getenv)
+     --> x="home = /home/roberto, user = roberto"
+     
+     x = string.gsub("4+5 = $return 4+5$", "%$(.-)%$", function (s)
+           return load(s)()
+         end)
+     --> x="4+5 = 9"
+     
+     local t = {name="lua", version="5.4"}
+     x = string.gsub("$name-$version.tar.gz", "%$(%w+)", t)
+     --> x="lua-5.4.tar.gz"
+
+ + + +

+

string.len (s)

+ + +

+Receives a string and returns its length. +The empty string "" has length 0. +Embedded zeros are counted, +so "a\000bc\000" has length 5. + + + + +

+

string.lower (s)

+ + +

+Receives a string and returns a copy of this string with all +uppercase letters changed to lowercase. +All other characters are left unchanged. +The definition of what an uppercase letter is depends on the current locale. + + + + +

+

string.match (s, pattern [, init])

+ + +

+Looks for the first match of +the pattern (see §6.4.1) in the string s. +If it finds one, then match returns +the captures from the pattern; +otherwise it returns fail. +If pattern specifies no captures, +then the whole match is returned. +A third, optional numeric argument init specifies +where to start the search; +its default value is 1 and can be negative. + + + + +

+

string.pack (fmt, v1, v2, ···)

+ + +

+Returns a binary string containing the values v1, v2, etc. +serialized in binary form (packed) +according to the format string fmt (see §6.4.2). + + + + +

+

string.packsize (fmt)

+ + +

+Returns the length of a string resulting from string.pack +with the given format. +The format string cannot have the variable-length options +'s' or 'z' (see §6.4.2). + + + + +

+

string.rep (s, n [, sep])

+ + +

+Returns a string that is the concatenation of n copies of +the string s separated by the string sep. +The default value for sep is the empty string +(that is, no separator). +Returns the empty string if n is not positive. + + +

+(Note that it is very easy to exhaust the memory of your machine +with a single call to this function.) + + + + +

+

string.reverse (s)

+ + +

+Returns a string that is the string s reversed. + + + + +

+

string.sub (s, i [, j])

+ + +

+Returns the substring of s that +starts at i and continues until j; +i and j can be negative. +If j is absent, then it is assumed to be equal to -1 +(which is the same as the string length). +In particular, +the call string.sub(s,1,j) returns a prefix of s +with length j, +and string.sub(s, -i) (for a positive i) +returns a suffix of s +with length i. + + +

+If, after the translation of negative indices, +i is less than 1, +it is corrected to 1. +If j is greater than the string length, +it is corrected to that length. +If, after these corrections, +i is greater than j, +the function returns the empty string. + + + + +

+

string.unpack (fmt, s [, pos])

+ + +

+Returns the values packed in string s (see string.pack) +according to the format string fmt (see §6.4.2). +An optional pos marks where +to start reading in s (default is 1). +After the read values, +this function also returns the index of the first unread byte in s. + + + + +

+

string.upper (s)

+ + +

+Receives a string and returns a copy of this string with all +lowercase letters changed to uppercase. +All other characters are left unchanged. +The definition of what a lowercase letter is depends on the current locale. + + + + + + + +

6.4.1 – Patterns

+ + + +

+Patterns in Lua are described by regular strings, +which are interpreted as patterns by the pattern-matching functions +string.find, +string.gmatch, +string.gsub, +and string.match. +This section describes the syntax and the meaning +(that is, what they match) of these strings. + + + + + +

Character Class:

+A character class is used to represent a set of characters. +The following combinations are allowed in describing a character class: + +

    + +
  • x: +(where x is not one of the magic characters +^$()%.[]*+-?) +represents the character x itself. +
    • + +
  • .: (a dot) represents all characters.
    • + +
  • %a: represents all letters.
    • + +
  • %c: represents all control characters.
    • + +
  • %d: represents all digits.
    • + +
  • %g: represents all printable characters except space.
    • + +
  • %l: represents all lowercase letters.
    • + +
  • %p: represents all punctuation characters.
    • + +
  • %s: represents all space characters.
    • + +
  • %u: represents all uppercase letters.
    • + +
  • %w: represents all alphanumeric characters.
    • + +
  • %x: represents all hexadecimal digits.
    • + +
  • %x: (where x is any non-alphanumeric character) +represents the character x. +This is the standard way to escape the magic characters. +Any non-alphanumeric character +(including all punctuation characters, even the non-magical) +can be preceded by a '%' to represent itself in a pattern. +
    • + +
  • [set]: +represents the class which is the union of all +characters in set. +A range of characters can be specified by +separating the end characters of the range, +in ascending order, with a '-'. +All classes %x described above can also be used as +components in set. +All other characters in set represent themselves. +For example, [%w_] (or [_%w]) +represents all alphanumeric characters plus the underscore, +[0-7] represents the octal digits, +and [0-7%l%-] represents the octal digits plus +the lowercase letters plus the '-' character. + + +

    +You can put a closing square bracket in a set +by positioning it as the first character in the set. +You can put a hyphen in a set +by positioning it as the first or the last character in the set. +(You can also use an escape for both cases.) + + +

    +The interaction between ranges and classes is not defined. +Therefore, patterns like [%a-z] or [a-%%] +have no meaning. +

    • + +
  • [^set]: +represents the complement of set, +where set is interpreted as above. +
    • + +

+For all classes represented by single letters (%a, %c, etc.), +the corresponding uppercase letter represents the complement of the class. +For instance, %S represents all non-space characters. + + +

+The definitions of letter, space, and other character groups +depend on the current locale. +In particular, the class [a-z] may not be equivalent to %l. + + + + + +

Pattern Item:

+A pattern item can be + +

    + +
  • +a single character class, +which matches any single character in the class; +
    • + +
  • +a single character class followed by '*', +which matches sequences of zero or more characters in the class. +These repetition items will always match the longest possible sequence; +
    • + +
  • +a single character class followed by '+', +which matches sequences of one or more characters in the class. +These repetition items will always match the longest possible sequence; +
    • + +
  • +a single character class followed by '-', +which also matches sequences of zero or more characters in the class. +Unlike '*', +these repetition items will always match the shortest possible sequence; +
    • + +
  • +a single character class followed by '?', +which matches zero or one occurrence of a character in the class. +It always matches one occurrence if possible; +
    • + +
  • +%n, for n between 1 and 9; +such item matches a substring equal to the n-th captured string +(see below); +
    • + +
  • +%bxy, where x and y are two distinct characters; +such item matches strings that start with x, end with y, +and where the x and y are balanced. +This means that, if one reads the string from left to right, +counting +1 for an x and -1 for a y, +the ending y is the first y where the count reaches 0. +For instance, the item %b() matches expressions with +balanced parentheses. +
    • + +
  • +%f[set], a frontier pattern; +such item matches an empty string at any position such that +the next character belongs to set +and the previous character does not belong to set. +The set set is interpreted as previously described. +The beginning and the end of the subject are handled as if +they were the character '\0'. +
    • + +
+ + + + +

Pattern:

+A pattern is a sequence of pattern items. +A caret '^' at the beginning of a pattern anchors the match at the +beginning of the subject string. +A '$' at the end of a pattern anchors the match at the +end of the subject string. +At other positions, +'^' and '$' have no special meaning and represent themselves. + + + + + +

Captures:

+A pattern can contain sub-patterns enclosed in parentheses; +they describe captures. +When a match succeeds, the substrings of the subject string +that match captures are stored (captured) for future use. +Captures are numbered according to their left parentheses. +For instance, in the pattern "(a*(.)%w(%s*))", +the part of the string matching "a*(.)%w(%s*)" is +stored as the first capture, and therefore has number 1; +the character matching "." is captured with number 2, +and the part matching "%s*" has number 3. + + +

+As a special case, the capture () captures +the current string position (a number). +For instance, if we apply the pattern "()aa()" on the +string "flaaap", there will be two captures: 3 and 5. + + + + + +

Multiple matches:

+The function string.gsub and the iterator string.gmatch +match multiple occurrences of the given pattern in the subject. +For these functions, +a new match is considered valid only +if it ends at least one byte after the end of the previous match. +In other words, the pattern machine never accepts the +empty string as a match immediately after another match. +As an example, +consider the results of the following code: + +

+     > string.gsub("abc", "()a*()", print);
+     --> 1   2
+     --> 3   3
+     --> 4   4
+

+The second and third results come from Lua matching an empty +string after 'b' and another one after 'c'. +Lua does not match an empty string after 'a', +because it would end at the same position of the previous match. + + + + + + + +

6.4.2 – Format Strings for Pack and Unpack

+ +

+The first argument to string.pack, +string.packsize, and string.unpack +is a format string, +which describes the layout of the structure being created or read. + + +

+A format string is a sequence of conversion options. +The conversion options are as follows: + +

    +
  • <: sets little endian
    • +
  • >: sets big endian
    • +
  • =: sets native endian
    • +
  • ![n]: sets maximum alignment to n +(default is native alignment)
    • +
  • b: a signed byte (char)
    • +
  • B: an unsigned byte (char)
    • +
  • h: a signed short (native size)
    • +
  • H: an unsigned short (native size)
    • +
  • l: a signed long (native size)
    • +
  • L: an unsigned long (native size)
    • +
  • j: a lua_Integer
    • +
  • J: a lua_Unsigned
    • +
  • T: a size_t (native size)
    • +
  • i[n]: a signed int with n bytes +(default is native size)
    • +
  • I[n]: an unsigned int with n bytes +(default is native size)
    • +
  • f: a float (native size)
    • +
  • d: a double (native size)
    • +
  • n: a lua_Number
    • +
  • cn: a fixed-sized string with n bytes
    • +
  • z: a zero-terminated string
    • +
  • s[n]: a string preceded by its length +coded as an unsigned integer with n bytes +(default is a size_t)
    • +
  • x: one byte of padding
    • +
  • Xop: an empty item that aligns +according to option op +(which is otherwise ignored)
    • +
  • ' ': (space) ignored
    • +

+(A "[n]" means an optional integral numeral.) +Except for padding, spaces, and configurations +(options "xX <=>!"), +each option corresponds to an argument in string.pack +or a result in string.unpack. + + +

+For options "!n", "sn", "in", and "In", +n can be any integer between 1 and 16. +All integral options check overflows; +string.pack checks whether the given value fits in the given size; +string.unpack checks whether the read value fits in a Lua integer. +For the unsigned options, +Lua integers are treated as unsigned values too. + + +

+Any format string starts as if prefixed by "!1=", +that is, +with maximum alignment of 1 (no alignment) +and native endianness. + + +

+Native endianness assumes that the whole system is +either big or little endian. +The packing functions will not emulate correctly the behavior +of mixed-endian formats. + + +

+Alignment works as follows: +For each option, +the format gets extra padding until the data starts +at an offset that is a multiple of the minimum between the +option size and the maximum alignment; +this minimum must be a power of 2. +Options "c" and "z" are not aligned; +option "s" follows the alignment of its starting integer. + + +

+All padding is filled with zeros by string.pack +and ignored by string.unpack. + + + + + + + +

6.5 – UTF-8 Support

+ +

+This library provides basic support for UTF-8 encoding. +It provides all its functions inside the table utf8. +This library does not provide any support for Unicode other +than the handling of the encoding. +Any operation that needs the meaning of a character, +such as character classification, is outside its scope. + + +

+Unless stated otherwise, +all functions that expect a byte position as a parameter +assume that the given position is either the start of a byte sequence +or one plus the length of the subject string. +As in the string library, +negative indices count from the end of the string. + + +

+Functions that create byte sequences +accept all values up to 0x7FFFFFFF, +as defined in the original UTF-8 specification; +that implies byte sequences of up to six bytes. + + +

+Functions that interpret byte sequences only accept +valid sequences (well formed and not overlong). +By default, they only accept byte sequences +that result in valid Unicode code points, +rejecting values greater than 10FFFF and surrogates. +A boolean argument lax, when available, +lifts these checks, +so that all values up to 0x7FFFFFFF are accepted. +(Not well formed and overlong sequences are still rejected.) + + +

+

utf8.char (···)

+ + +

+Receives zero or more integers, +converts each one to its corresponding UTF-8 byte sequence +and returns a string with the concatenation of all these sequences. + + + + +

+

utf8.charpattern

+ + +

+The pattern (a string, not a function) "[\0-\x7F\xC2-\xFD][\x80-\xBF]*" +(see §6.4.1), +which matches exactly one UTF-8 byte sequence, +assuming that the subject is a valid UTF-8 string. + + + + +

+

utf8.codes (s [, lax])

+ + +

+Returns values so that the construction + +

+     for p, c in utf8.codes(s) do body end
+

+will iterate over all UTF-8 characters in string s, +with p being the position (in bytes) and c the code point +of each character. +It raises an error if it meets any invalid byte sequence. + + + + +

+

utf8.codepoint (s [, i [, j [, lax]]])

+ + +

+Returns the code points (as integers) from all characters in s +that start between byte position i and j (both included). +The default for i is 1 and for j is i. +It raises an error if it meets any invalid byte sequence. + + + + +

+

utf8.len (s [, i [, j [, lax]]])

+ + +

+Returns the number of UTF-8 characters in string s +that start between positions i and j (both inclusive). +The default for i is 1 and for j is -1. +If it finds any invalid byte sequence, +returns fail plus the position of the first invalid byte. + + + + +

+

utf8.offset (s, n [, i])

+ + +

+Returns the position (in bytes) where the encoding of the +n-th character of s +(counting from position i) starts. +A negative n gets characters before position i. +The default for i is 1 when n is non-negative +and #s + 1 otherwise, +so that utf8.offset(s, -n) gets the offset of the +n-th character from the end of the string. +If the specified character is neither in the subject +nor right after its end, +the function returns fail. + + +

+As a special case, +when n is 0 the function returns the start of the encoding +of the character that contains the i-th byte of s. + + +

+This function assumes that s is a valid UTF-8 string. + + + + + + + +

6.6 – Table Manipulation

+ +

+This library provides generic functions for table manipulation. +It provides all its functions inside the table table. + + +

+Remember that, whenever an operation needs the length of a table, +all caveats about the length operator apply (see §3.4.7). +All functions ignore non-numeric keys +in the tables given as arguments. + + +

+

table.concat (list [, sep [, i [, j]]])

+ + +

+Given a list where all elements are strings or numbers, +returns the string list[i]..sep..list[i+1] ··· sep..list[j]. +The default value for sep is the empty string, +the default for i is 1, +and the default for j is #list. +If i is greater than j, returns the empty string. + + + + +

+

table.insert (list, [pos,] value)

+ + +

+Inserts element value at position pos in list, +shifting up the elements +list[pos], list[pos+1], ···, list[#list]. +The default value for pos is #list+1, +so that a call table.insert(t,x) inserts x at the end +of the list t. + + + + +

+

table.move (a1, f, e, t [,a2])

+ + +

+Moves elements from the table a1 to the table a2, +performing the equivalent to the following +multiple assignment: +a2[t],··· = a1[f],···,a1[e]. +The default for a2 is a1. +The destination range can overlap with the source range. +The number of elements to be moved must fit in a Lua integer. + + +

+Returns the destination table a2. + + + + +

+

table.pack (···)

+ + +

+Returns a new table with all arguments stored into keys 1, 2, etc. +and with a field "n" with the total number of arguments. +Note that the resulting table may not be a sequence, +if some arguments are nil. + + + + +

+

table.remove (list [, pos])

+ + +

+Removes from list the element at position pos, +returning the value of the removed element. +When pos is an integer between 1 and #list, +it shifts down the elements +list[pos+1], list[pos+2], ···, list[#list] +and erases element list[#list]; +The index pos can also be 0 when #list is 0, +or #list + 1. + + +

+The default value for pos is #list, +so that a call table.remove(l) removes the last element +of the list l. + + + + +

+

table.sort (list [, comp])

+ + +

+Sorts the list elements in a given order, in-place, +from list[1] to list[#list]. +If comp is given, +then it must be a function that receives two list elements +and returns true when the first element must come +before the second in the final order, +so that, after the sort, +i <= j implies not comp(list[j],list[i]). +If comp is not given, +then the standard Lua operator < is used instead. + + +

+The comp function must define a consistent order; +more formally, the function must define a strict weak order. +(A weak order is similar to a total order, +but it can equate different elements for comparison purposes.) + + +

+The sort algorithm is not stable: +Different elements considered equal by the given order +may have their relative positions changed by the sort. + + + + +

+

table.unpack (list [, i [, j]])

+ + +

+Returns the elements from the given list. +This function is equivalent to + +

+     return list[i], list[i+1], ···, list[j]
+

+By default, i is 1 and j is #list. + + + + + + + +

6.7 – Mathematical Functions

+ +

+This library provides basic mathematical functions. +It provides all its functions and constants inside the table math. +Functions with the annotation "integer/float" give +integer results for integer arguments +and float results for non-integer arguments. +The rounding functions +math.ceil, math.floor, and math.modf +return an integer when the result fits in the range of an integer, +or a float otherwise. + + +

+

math.abs (x)

+ + +

+Returns the maximum value between x and -x. (integer/float) + + + + +

+

math.acos (x)

+ + +

+Returns the arc cosine of x (in radians). + + + + +

+

math.asin (x)

+ + +

+Returns the arc sine of x (in radians). + + + + +

+

math.atan (y [, x])

+ + +

+ +Returns the arc tangent of y/x (in radians), +using the signs of both arguments to find the +quadrant of the result. +It also handles correctly the case of x being zero. + + +

+The default value for x is 1, +so that the call math.atan(y) +returns the arc tangent of y. + + + + +

+

math.ceil (x)

+ + +

+Returns the smallest integral value greater than or equal to x. + + + + +

+

math.cos (x)

+ + +

+Returns the cosine of x (assumed to be in radians). + + + + +

+

math.deg (x)

+ + +

+Converts the angle x from radians to degrees. + + + + +

+

math.exp (x)

+ + +

+Returns the value ex +(where e is the base of natural logarithms). + + + + +

+

math.floor (x)

+ + +

+Returns the largest integral value less than or equal to x. + + + + +

+

math.fmod (x, y)

+ + +

+Returns the remainder of the division of x by y +that rounds the quotient towards zero. (integer/float) + + + + +

+

math.huge

+ + +

+The float value HUGE_VAL, +a value greater than any other numeric value. + + + + +

+

math.log (x [, base])

+ + +

+Returns the logarithm of x in the given base. +The default for base is e +(so that the function returns the natural logarithm of x). + + + + +

+

math.max (x, ···)

+ + +

+Returns the argument with the maximum value, +according to the Lua operator <. + + + + +

+

math.maxinteger

+An integer with the maximum value for an integer. + + + + +

+

math.min (x, ···)

+ + +

+Returns the argument with the minimum value, +according to the Lua operator <. + + + + +

+

math.mininteger

+An integer with the minimum value for an integer. + + + + +

+

math.modf (x)

+ + +

+Returns the integral part of x and the fractional part of x. +Its second result is always a float. + + + + +

+

math.pi

+ + +

+The value of π. + + + + +

+

math.rad (x)

+ + +

+Converts the angle x from degrees to radians. + + + + +

+

math.random ([m [, n]])

+ + +

+When called without arguments, +returns a pseudo-random float with uniform distribution +in the range [0,1). +When called with two integers m and n, +math.random returns a pseudo-random integer +with uniform distribution in the range [m, n]. +The call math.random(n), for a positive n, +is equivalent to math.random(1,n). +The call math.random(0) produces an integer with +all bits (pseudo)random. + + +

+This function uses the xoshiro256** algorithm to produce +pseudo-random 64-bit integers, +which are the results of calls with argument 0. +Other results (ranges and floats) +are unbiased extracted from these integers. + + +

+Lua initializes its pseudo-random generator with the equivalent of +a call to math.randomseed with no arguments, +so that math.random should generate +different sequences of results each time the program runs. + + + + +

+

math.randomseed ([x [, y]])

+ + +

+When called with at least one argument, +the integer parameters x and y are +joined into a 128-bit seed that +is used to reinitialize the pseudo-random generator; +equal seeds produce equal sequences of numbers. +The default for y is zero. + + +

+When called with no arguments, +Lua generates a seed with +a weak attempt for randomness. + + +

+This function returns the two seed components +that were effectively used, +so that setting them again repeats the sequence. + + +

+To ensure a required level of randomness to the initial state +(or contrarily, to have a deterministic sequence, +for instance when debugging a program), +you should call math.randomseed with explicit arguments. + + + + +

+

math.sin (x)

+ + +

+Returns the sine of x (assumed to be in radians). + + + + +

+

math.sqrt (x)

+ + +

+Returns the square root of x. +(You can also use the expression x^0.5 to compute this value.) + + + + +

+

math.tan (x)

+ + +

+Returns the tangent of x (assumed to be in radians). + + + + +

+

math.tointeger (x)

+ + +

+If the value x is convertible to an integer, +returns that integer. +Otherwise, returns fail. + + + + +

+

math.type (x)

+ + +

+Returns "integer" if x is an integer, +"float" if it is a float, +or fail if x is not a number. + + + + +

+

math.ult (m, n)

+ + +

+Returns a boolean, +true if and only if integer m is below integer n when +they are compared as unsigned integers. + + + + + + + +

6.8 – Input and Output Facilities

+ +

+The I/O library provides two different styles for file manipulation. +The first one uses implicit file handles; +that is, there are operations to set a default input file and a +default output file, +and all input/output operations are done over these default files. +The second style uses explicit file handles. + + +

+When using implicit file handles, +all operations are supplied by table io. +When using explicit file handles, +the operation io.open returns a file handle +and then all operations are supplied as methods of the file handle. + + +

+The metatable for file handles provides metamethods +for __gc and __close that try +to close the file when called. + + +

+The table io also provides +three predefined file handles with their usual meanings from C: +io.stdin, io.stdout, and io.stderr. +The I/O library never closes these files. + + +

+Unless otherwise stated, +all I/O functions return fail on failure, +plus an error message as a second result and +a system-dependent error code as a third result, +and some non-false value on success. +On non-POSIX systems, +the computation of the error message and error code +in case of errors +may be not thread safe, +because they rely on the global C variable errno. + + +

+

io.close ([file])

+ + +

+Equivalent to file:close(). +Without a file, closes the default output file. + + + + +

+

io.flush ()

+ + +

+Equivalent to io.output():flush(). + + + + +

+

io.input ([file])

+ + +

+When called with a file name, it opens the named file (in text mode), +and sets its handle as the default input file. +When called with a file handle, +it simply sets this file handle as the default input file. +When called without arguments, +it returns the current default input file. + + +

+In case of errors this function raises the error, +instead of returning an error code. + + + + +

+

io.lines ([filename, ···])

+ + +

+Opens the given file name in read mode +and returns an iterator function that +works like file:lines(···) over the opened file. +When the iterator function fails to read any value, +it automatically closes the file. +Besides the iterator function, +io.lines returns three other values: +two nil values as placeholders, +plus the created file handle. +Therefore, when used in a generic for loop, +the file is closed also if the loop is interrupted by an +error or a break. + + +

+The call io.lines() (with no file name) is equivalent +to io.input():lines("l"); +that is, it iterates over the lines of the default input file. +In this case, the iterator does not close the file when the loop ends. + + +

+In case of errors opening the file, +this function raises the error, +instead of returning an error code. + + + + +

+

io.open (filename [, mode])

+ + +

+This function opens a file, +in the mode specified in the string mode. +In case of success, +it returns a new file handle. + + +

+The mode string can be any of the following: + +

    +
  • "r": read mode (the default);
    • +
  • "w": write mode;
    • +
  • "a": append mode;
    • +
  • "r+": update mode, all previous data is preserved;
    • +
  • "w+": update mode, all previous data is erased;
    • +
  • "a+": append update mode, previous data is preserved, + writing is only allowed at the end of file.
    • +

+The mode string can also have a 'b' at the end, +which is needed in some systems to open the file in binary mode. + + + + +

+

io.output ([file])

+ + +

+Similar to io.input, but operates over the default output file. + + + + +

+

io.popen (prog [, mode])

+ + +

+This function is system dependent and is not available +on all platforms. + + +

+Starts the program prog in a separated process and returns +a file handle that you can use to read data from this program +(if mode is "r", the default) +or to write data to this program +(if mode is "w"). + + + + +

+

io.read (···)

+ + +

+Equivalent to io.input():read(···). + + + + +

+

io.tmpfile ()

+ + +

+In case of success, +returns a handle for a temporary file. +This file is opened in update mode +and it is automatically removed when the program ends. + + + + +

+

io.type (obj)

+ + +

+Checks whether obj is a valid file handle. +Returns the string "file" if obj is an open file handle, +"closed file" if obj is a closed file handle, +or fail if obj is not a file handle. + + + + +

+

io.write (···)

+ + +

+Equivalent to io.output():write(···). + + + + +

+

file:close ()

+ + +

+Closes file. +Note that files are automatically closed when +their handles are garbage collected, +but that takes an unpredictable amount of time to happen. + + +

+When closing a file handle created with io.popen, +file:close returns the same values +returned by os.execute. + + + + +

+

file:flush ()

+ + +

+Saves any written data to file. + + + + +

+

file:lines (···)

+ + +

+Returns an iterator function that, +each time it is called, +reads the file according to the given formats. +When no format is given, +uses "l" as a default. +As an example, the construction + +

+     for c in file:lines(1) do body end
+

+will iterate over all characters of the file, +starting at the current position. +Unlike io.lines, this function does not close the file +when the loop ends. + + + + +

+

file:read (···)

+ + +

+Reads the file file, +according to the given formats, which specify what to read. +For each format, +the function returns a string or a number with the characters read, +or fail if it cannot read data with the specified format. +(In this latter case, +the function does not read subsequent formats.) +When called without arguments, +it uses a default format that reads the next line +(see below). + + +

+The available formats are + +

    + +
  • "n": +reads a numeral and returns it as a float or an integer, +following the lexical conventions of Lua. +(The numeral may have leading whitespaces and a sign.) +This format always reads the longest input sequence that +is a valid prefix for a numeral; +if that prefix does not form a valid numeral +(e.g., an empty string, "0x", or "3.4e-") +or it is too long (more than 200 characters), +it is discarded and the format returns fail. +
    • + +
  • "a": +reads the whole file, starting at the current position. +On end of file, it returns the empty string; +this format never fails. +
    • + +
  • "l": +reads the next line skipping the end of line, +returning fail on end of file. +This is the default format. +
    • + +
  • "L": +reads the next line keeping the end-of-line character (if present), +returning fail on end of file. +
    • + +
  • number: +reads a string with up to this number of bytes, +returning fail on end of file. +If number is zero, +it reads nothing and returns an empty string, +or fail on end of file. +
    • + +

+The formats "l" and "L" should be used only for text files. + + + + +

+

file:seek ([whence [, offset]])

+ + +

+Sets and gets the file position, +measured from the beginning of the file, +to the position given by offset plus a base +specified by the string whence, as follows: + +

    +
  • "set": base is position 0 (beginning of the file);
    • +
  • "cur": base is current position;
    • +
  • "end": base is end of file;
    • +

+In case of success, seek returns the final file position, +measured in bytes from the beginning of the file. +If seek fails, it returns fail, +plus a string describing the error. + + +

+The default value for whence is "cur", +and for offset is 0. +Therefore, the call file:seek() returns the current +file position, without changing it; +the call file:seek("set") sets the position to the +beginning of the file (and returns 0); +and the call file:seek("end") sets the position to the +end of the file, and returns its size. + + + + +

+

file:setvbuf (mode [, size])

+ + +

+Sets the buffering mode for a file. +There are three available modes: + +

    +
  • "no": no buffering.
    • +
  • "full": full buffering.
    • +
  • "line": line buffering.
    • +
+ +

+For the last two cases, +size is a hint for the size of the buffer, in bytes. +The default is an appropriate size. + + +

+The specific behavior of each mode is non portable; +check the underlying ISO C function setvbuf in your platform for +more details. + + + + +

+

file:write (···)

+ + +

+Writes the value of each of its arguments to file. +The arguments must be strings or numbers. + + +

+In case of success, this function returns file. + + + + + + + +

6.9 – Operating System Facilities

+ +

+This library is implemented through table os. + + +

+

os.clock ()

+ + +

+Returns an approximation of the amount in seconds of CPU time +used by the program, +as returned by the underlying ISO C function clock. + + + + +

+

os.date ([format [, time]])

+ + +

+Returns a string or a table containing date and time, +formatted according to the given string format. + + +

+If the time argument is present, +this is the time to be formatted +(see the os.time function for a description of this value). +Otherwise, date formats the current time. + + +

+If format starts with '!', +then the date is formatted in Coordinated Universal Time. +After this optional character, +if format is the string "*t", +then date returns a table with the following fields: +year, month (1–12), day (1–31), +hour (0–23), min (0–59), +sec (0–61, due to leap seconds), +wday (weekday, 1–7, Sunday is 1), +yday (day of the year, 1–366), +and isdst (daylight saving flag, a boolean). +This last field may be absent +if the information is not available. + + +

+If format is not "*t", +then date returns the date as a string, +formatted according to the same rules as the ISO C function strftime. + + +

+If format is absent, it defaults to "%c", +which gives a human-readable date and time representation +using the current locale. + + +

+On non-POSIX systems, +this function may be not thread safe +because of its reliance on C function gmtime and C function localtime. + + + + +

+

os.difftime (t2, t1)

+ + +

+Returns the difference, in seconds, +from time t1 to time t2 +(where the times are values returned by os.time). +In POSIX, Windows, and some other systems, +this value is exactly t2-t1. + + + + +

+

os.execute ([command])

+ + +

+This function is equivalent to the ISO C function system. +It passes command to be executed by an operating system shell. +Its first result is true +if the command terminated successfully, +or fail otherwise. +After this first result +the function returns a string plus a number, +as follows: + +

    + +
  • "exit": +the command terminated normally; +the following number is the exit status of the command. +
    • + +
  • "signal": +the command was terminated by a signal; +the following number is the signal that terminated the command. +
    • + +
+ +

+When called without a command, +os.execute returns a boolean that is true if a shell is available. + + + + +

+

os.exit ([code [, close]])

+ + +

+Calls the ISO C function exit to terminate the host program. +If code is true, +the returned status is EXIT_SUCCESS; +if code is false, +the returned status is EXIT_FAILURE; +if code is a number, +the returned status is this number. +The default value for code is true. + + +

+If the optional second argument close is true, +the function closes the Lua state before exiting (see lua_close). + + + + +

+

os.getenv (varname)

+ + +

+Returns the value of the process environment variable varname +or fail if the variable is not defined. + + + + +

+

os.remove (filename)

+ + +

+Deletes the file (or empty directory, on POSIX systems) +with the given name. +If this function fails, it returns fail +plus a string describing the error and the error code. +Otherwise, it returns true. + + + + +

+

os.rename (oldname, newname)

+ + +

+Renames the file or directory named oldname to newname. +If this function fails, it returns fail, +plus a string describing the error and the error code. +Otherwise, it returns true. + + + + +

+

os.setlocale (locale [, category])

+ + +

+Sets the current locale of the program. +locale is a system-dependent string specifying a locale; +category is an optional string describing which category to change: +"all", "collate", "ctype", +"monetary", "numeric", or "time"; +the default category is "all". +The function returns the name of the new locale, +or fail if the request cannot be honored. + + +

+If locale is the empty string, +the current locale is set to an implementation-defined native locale. +If locale is the string "C", +the current locale is set to the standard C locale. + + +

+When called with nil as the first argument, +this function only returns the name of the current locale +for the given category. + + +

+This function may be not thread safe +because of its reliance on C function setlocale. + + + + +

+

os.time ([table])

+ + +

+Returns the current time when called without arguments, +or a time representing the local date and time specified by the given table. +This table must have fields year, month, and day, +and may have fields +hour (default is 12), +min (default is 0), +sec (default is 0), +and isdst (default is nil). +Other fields are ignored. +For a description of these fields, see the os.date function. + + +

+When the function is called, +the values in these fields do not need to be inside their valid ranges. +For instance, if sec is -10, +it means 10 seconds before the time specified by the other fields; +if hour is 1000, +it means 1000 hours after the time specified by the other fields. + + +

+The returned value is a number, whose meaning depends on your system. +In POSIX, Windows, and some other systems, +this number counts the number +of seconds since some given start time (the "epoch"). +In other systems, the meaning is not specified, +and the number returned by time can be used only as an argument to +os.date and os.difftime. + + +

+When called with a table, +os.time also normalizes all the fields +documented in the os.date function, +so that they represent the same time as before the call +but with values inside their valid ranges. + + + + +

+

os.tmpname ()

+ + +

+Returns a string with a file name that can +be used for a temporary file. +The file must be explicitly opened before its use +and explicitly removed when no longer needed. + + +

+In POSIX systems, +this function also creates a file with that name, +to avoid security risks. +(Someone else might create the file with wrong permissions +in the time between getting the name and creating the file.) +You still have to open the file to use it +and to remove it (even if you do not use it). + + +

+When possible, +you may prefer to use io.tmpfile, +which automatically removes the file when the program ends. + + + + + + + +

6.10 – The Debug Library

+ +

+This library provides +the functionality of the debug interface (§4.7) to Lua programs. +You should exert care when using this library. +Several of its functions +violate basic assumptions about Lua code +(e.g., that variables local to a function +cannot be accessed from outside; +that userdata metatables cannot be changed by Lua code; +that Lua programs do not crash) +and therefore can compromise otherwise secure code. +Moreover, some functions in this library may be slow. + + +

+All functions in this library are provided +inside the debug table. +All functions that operate over a thread +have an optional first argument which is the +thread to operate over. +The default is always the current thread. + + +

+

debug.debug ()

+ + +

+Enters an interactive mode with the user, +running each string that the user enters. +Using simple commands and other debug facilities, +the user can inspect global and local variables, +change their values, evaluate expressions, and so on. +A line containing only the word cont finishes this function, +so that the caller continues its execution. + + +

+Note that commands for debug.debug are not lexically nested +within any function and so have no direct access to local variables. + + + + +

+

debug.gethook ([thread])

+ + +

+Returns the current hook settings of the thread, as three values: +the current hook function, the current hook mask, +and the current hook count, +as set by the debug.sethook function. + + +

+Returns fail if there is no active hook. + + + + +

+

debug.getinfo ([thread,] f [, what])

+ + +

+Returns a table with information about a function. +You can give the function directly +or you can give a number as the value of f, +which means the function running at level f of the call stack +of the given thread: +level 0 is the current function (getinfo itself); +level 1 is the function that called getinfo +(except for tail calls, which do not count in the stack); +and so on. +If f is a number greater than the number of active functions, +then getinfo returns fail. + + +

+The returned table can contain all the fields returned by lua_getinfo, +with the string what describing which fields to fill in. +The default for what is to get all information available, +except the table of valid lines. +If present, +the option 'f' +adds a field named func with the function itself. +If present, +the option 'L' +adds a field named activelines with the table of +valid lines. + + +

+For instance, the expression debug.getinfo(1,"n").name returns +a name for the current function, +if a reasonable name can be found, +and the expression debug.getinfo(print) +returns a table with all available information +about the print function. + + + + +

+

debug.getlocal ([thread,] f, local)

+ + +

+This function returns the name and the value of the local variable +with index local of the function at level f of the stack. +This function accesses not only explicit local variables, +but also parameters and temporary values. + + +

+The first parameter or local variable has index 1, and so on, +following the order that they are declared in the code, +counting only the variables that are active +in the current scope of the function. +Compile-time constants may not appear in this listing, +if they were optimized away by the compiler. +Negative indices refer to vararg arguments; +-1 is the first vararg argument. +The function returns fail +if there is no variable with the given index, +and raises an error when called with a level out of range. +(You can call debug.getinfo to check whether the level is valid.) + + +

+Variable names starting with '(' (open parenthesis) +represent variables with no known names +(internal variables such as loop control variables, +and variables from chunks saved without debug information). + + +

+The parameter f may also be a function. +In that case, getlocal returns only the name of function parameters. + + + + +

+

debug.getmetatable (value)

+ + +

+Returns the metatable of the given value +or nil if it does not have a metatable. + + + + +

+

debug.getregistry ()

+ + +

+Returns the registry table (see §4.3). + + + + +

+

debug.getupvalue (f, up)

+ + +

+This function returns the name and the value of the upvalue +with index up of the function f. +The function returns fail +if there is no upvalue with the given index. + + +

+(For Lua functions, +upvalues are the external local variables that the function uses, +and that are consequently included in its closure.) + + +

+For C functions, this function uses the empty string "" +as a name for all upvalues. + + +

+Variable name '?' (interrogation mark) +represents variables with no known names +(variables from chunks saved without debug information). + + + + +

+

debug.getuservalue (u, n)

+ + +

+Returns the n-th user value associated +to the userdata u plus a boolean, +false if the userdata does not have that value. + + + + +

+

debug.sethook ([thread,] hook, mask [, count])

+ + +

+Sets the given function as the debug hook. +The string mask and the number count describe +when the hook will be called. +The string mask may have any combination of the following characters, +with the given meaning: + +

    +
  • 'c': the hook is called every time Lua calls a function;
    • +
  • 'r': the hook is called every time Lua returns from a function;
    • +
  • 'l': the hook is called every time Lua enters a new line of code.
    • +

+Moreover, +with a count different from zero, +the hook is called also after every count instructions. + + +

+When called without arguments, +debug.sethook turns off the hook. + + +

+When the hook is called, its first parameter is a string +describing the event that has triggered its call: +"call", "tail call", "return", +"line", and "count". +For line events, +the hook also gets the new line number as its second parameter. +Inside a hook, +you can call getinfo with level 2 to get more information about +the running function. +(Level 0 is the getinfo function, +and level 1 is the hook function.) + + + + +

+

debug.setlocal ([thread,] level, local, value)

+ + +

+This function assigns the value value to the local variable +with index local of the function at level level of the stack. +The function returns fail if there is no local +variable with the given index, +and raises an error when called with a level out of range. +(You can call getinfo to check whether the level is valid.) +Otherwise, it returns the name of the local variable. + + +

+See debug.getlocal for more information about +variable indices and names. + + + + +

+

debug.setmetatable (value, table)

+ + +

+Sets the metatable for the given value to the given table +(which can be nil). +Returns value. + + + + +

+

debug.setupvalue (f, up, value)

+ + +

+This function assigns the value value to the upvalue +with index up of the function f. +The function returns fail if there is no upvalue +with the given index. +Otherwise, it returns the name of the upvalue. + + +

+See debug.getupvalue for more information about upvalues. + + + + +

+

debug.setuservalue (udata, value, n)

+ + +

+Sets the given value as +the n-th user value associated to the given udata. +udata must be a full userdata. + + +

+Returns udata, +or fail if the userdata does not have that value. + + + + +

+

debug.traceback ([thread,] [message [, level]])

+ + +

+If message is present but is neither a string nor nil, +this function returns message without further processing. +Otherwise, +it returns a string with a traceback of the call stack. +The optional message string is appended +at the beginning of the traceback. +An optional level number tells at which level +to start the traceback +(default is 1, the function calling traceback). + + + + +

+

debug.upvalueid (f, n)

+ + +

+Returns a unique identifier (as a light userdata) +for the upvalue numbered n +from the given function. + + +

+These unique identifiers allow a program to check whether different +closures share upvalues. +Lua closures that share an upvalue +(that is, that access a same external local variable) +will return identical ids for those upvalue indices. + + + + +

+

debug.upvaluejoin (f1, n1, f2, n2)

+ + +

+Make the n1-th upvalue of the Lua closure f1 +refer to the n2-th upvalue of the Lua closure f2. + + + + + + + +

7 – Lua Standalone

+ +

+Although Lua has been designed as an extension language, +to be embedded in a host C program, +it is also frequently used as a standalone language. +An interpreter for Lua as a standalone language, +called simply lua, +is provided with the standard distribution. +The standalone interpreter includes +all standard libraries. +Its usage is: + +

+     lua [options] [script [args]]
+

+The options are: + +

    +
  • -e stat: execute string stat;
    • +
  • -i: enter interactive mode after running script;
    • +
  • -l mod: "require" mod and assign the + result to global mod;
    • +
  • -l g=mod: "require" mod and assign the + result to global g;
    • +
  • -v: print version information;
    • +
  • -E: ignore environment variables;
    • +
  • -W: turn warnings on;
    • +
  • --: stop handling options;
    • +
  • -: execute stdin as a file and stop handling options.
    • +

+(The form -l g=mod was introduced in release 5.4.4.) + + +

+After handling its options, lua runs the given script. +When called without arguments, +lua behaves as lua -v -i +when the standard input (stdin) is a terminal, +and as lua - otherwise. + + +

+When called without the option -E, +the interpreter checks for an environment variable LUA_INIT_5_4 +(or LUA_INIT if the versioned name is not defined) +before running any argument. +If the variable content has the format @filename, +then lua executes the file. +Otherwise, lua executes the string itself. + + +

+When called with the option -E, +Lua does not consult any environment variables. +In particular, +the values of package.path and package.cpath +are set with the default paths defined in luaconf.h. + + +

+The options -e, -l, and -W are handled in +the order they appear. +For instance, an invocation like + +

+     $ lua -e 'a=1' -llib1 script.lua
+

+will first set a to 1, then require the library lib1, +and finally run the file script.lua with no arguments. +(Here $ is the shell prompt. Your prompt may be different.) + + +

+Before running any code, +lua collects all command-line arguments +in a global table called arg. +The script name goes to index 0, +the first argument after the script name goes to index 1, +and so on. +Any arguments before the script name +(that is, the interpreter name plus its options) +go to negative indices. +For instance, in the call + +

+     $ lua -la b.lua t1 t2
+

+the table is like this: + +

+     arg = { [-2] = "lua", [-1] = "-la",
+             [0] = "b.lua",
+             [1] = "t1", [2] = "t2" }
+

+If there is no script in the call, +the interpreter name goes to index 0, +followed by the other arguments. +For instance, the call + +

+     $ lua -e "print(arg[1])"
+

+will print "-e". +If there is a script, +the script is called with arguments +arg[1], ···, arg[#arg]. +Like all chunks in Lua, +the script is compiled as a variadic function. + + +

+In interactive mode, +Lua repeatedly prompts and waits for a line. +After reading a line, +Lua first try to interpret the line as an expression. +If it succeeds, it prints its value. +Otherwise, it interprets the line as a statement. +If you write an incomplete statement, +the interpreter waits for its completion +by issuing a different prompt. + + +

+If the global variable _PROMPT contains a string, +then its value is used as the prompt. +Similarly, if the global variable _PROMPT2 contains a string, +its value is used as the secondary prompt +(issued during incomplete statements). + + +

+In case of unprotected errors in the script, +the interpreter reports the error to the standard error stream. +If the error object is not a string but +has a metamethod __tostring, +the interpreter calls this metamethod to produce the final message. +Otherwise, the interpreter converts the error object to a string +and adds a stack traceback to it. +When warnings are on, +they are simply printed in the standard error output. + + +

+When finishing normally, +the interpreter closes its main Lua state +(see lua_close). +The script can avoid this step by +calling os.exit to terminate. + + +

+To allow the use of Lua as a +script interpreter in Unix systems, +Lua skips the first line of a file chunk if it starts with #. +Therefore, Lua scripts can be made into executable programs +by using chmod +x and the #! form, +as in + +

+     #!/usr/local/bin/lua
+

+Of course, +the location of the Lua interpreter may be different in your machine. +If lua is in your PATH, +then + +

+     #!/usr/bin/env lua
+

+is a more portable solution. + + + +

8 – Incompatibilities with the Previous Version

+ + + +

+Here we list the incompatibilities that you may find when moving a program +from Lua 5.3 to Lua 5.4. + + +

+You can avoid some incompatibilities by compiling Lua with +appropriate options (see file luaconf.h). +However, +all these compatibility options will be removed in the future. +More often than not, +compatibility issues arise when these compatibility options +are removed. +So, whenever you have the chance, +you should try to test your code with a version of Lua compiled +with all compatibility options turned off. +That will ease transitions to newer versions of Lua. + + +

+Lua versions can always change the C API in ways that +do not imply source-code changes in a program, +such as the numeric values for constants +or the implementation of functions as macros. +Therefore, +you should never assume that binaries are compatible between +different Lua versions. +Always recompile clients of the Lua API when +using a new version. + + +

+Similarly, Lua versions can always change the internal representation +of precompiled chunks; +precompiled chunks are not compatible between different Lua versions. + + +

+The standard paths in the official distribution may +change between versions. + + + + + +

8.1 – Incompatibilities in the Language

+
    + +
  • +The coercion of strings to numbers in +arithmetic and bitwise operations +has been removed from the core language. +The string library does a similar job +for arithmetic (but not for bitwise) operations +using the string metamethods. +However, unlike in previous versions, +the new implementation preserves the implicit type of the numeral +in the string. +For instance, the result of "1" + "2" now is an integer, +not a float. +
    • + +
  • +Literal decimal integer constants that overflow are read as floats, +instead of wrapping around. +You can use hexadecimal notation for such constants if you +want the old behavior +(reading them as integers with wrap around). +
    • + +
  • +The use of the __lt metamethod to emulate __le +has been removed. +When needed, this metamethod must be explicitly defined. +
    • + +
  • +The semantics of the numerical for loop +over integers changed in some details. +In particular, the control variable never wraps around. +
    • + +
  • +A label for a goto cannot be declared where a label with the same +name is visible, even if this other label is declared in an enclosing +block. +
    • + +
  • +When finalizing an object, +Lua does not ignore __gc metamethods that are not functions. +Any value will be called, if present. +(Non-callable values will generate a warning, +like any other error when calling a finalizer.) +
    • + +
+ + + + +

8.2 – Incompatibilities in the Libraries

+
    + +
  • +The function print does not call tostring +to format its arguments; +instead, it has this functionality hardwired. +You should use __tostring to modify how values are printed. +
    • + +
  • +The pseudo-random number generator used by the function math.random +now starts with a somewhat random seed. +Moreover, it uses a different algorithm. +
    • + +
  • +By default, the decoding functions in the utf8 library +do not accept surrogates as valid code points. +An extra parameter in these functions makes them more permissive. +
    • + +
  • +The options "setpause" and "setstepmul" +of the function collectgarbage are deprecated. +You should use the new option "incremental" to set them. +
    • + +
  • +The function io.lines now returns four values, +instead of just one. +That can be a problem when it is used as the sole +argument to another function that has optional parameters, +such as in load(io.lines(filename, "L")). +To fix that issue, +you can wrap the call into parentheses, +to adjust its number of results to one. +
    • + +
+ + + + +

8.3 – Incompatibilities in the API

+ + +
    + +
  • +Full userdata now has an arbitrary number of associated user values. +Therefore, the functions lua_newuserdata, +lua_setuservalue, and lua_getuservalue were +replaced by lua_newuserdatauv, +lua_setiuservalue, and lua_getiuservalue, +which have an extra argument. + + +

    +For compatibility, the old names still work as macros assuming +one single user value. +Note, however, that userdata with zero user values +are more efficient memory-wise. +

    • + +
  • +The function lua_resume has an extra parameter. +This out parameter returns the number of values on +the top of the stack that were yielded or returned by the coroutine. +(In previous versions, +those values were the entire stack.) +
    • + +
  • +The function lua_version returns the version number, +instead of an address of the version number. +The Lua core should work correctly with libraries using their +own static copies of the same core, +so there is no need to check whether they are using the same +address space. +
    • + +
  • +The constant LUA_ERRGCMM was removed. +Errors in finalizers are never propagated; +instead, they generate a warning. +
    • + +
  • +The options LUA_GCSETPAUSE and LUA_GCSETSTEPMUL +of the function lua_gc are deprecated. +You should use the new option LUA_GCINC to set them. +
    • + +
+ + + + +

9 – The Complete Syntax of Lua

+ +

+Here is the complete syntax of Lua in extended BNF. +As usual in extended BNF, +{A} means 0 or more As, +and [A] means an optional A. +(For operator precedences, see §3.4.8; +for a description of the terminals +Name, Numeral, +and LiteralString, see §3.1.) + + + + +

+
+	chunk ::= block
+
+	block ::= {stat} [retstat]
+
+	stat ::=  ‘;’ | 
+		 varlist ‘=’ explist | 
+		 functioncall | 
+		 label | 
+		 break | 
+		 goto Name | 
+		 do block end | 
+		 while exp do block end | 
+		 repeat block until exp | 
+		 if exp then block {elseif exp then block} [else block] end | 
+		 for Name ‘=’ exp ‘,’ exp [‘,’ exp] do block end | 
+		 for namelist in explist do block end | 
+		 function funcname funcbody | 
+		 local function Name funcbody | 
+		 local attnamelist [‘=’ explist] 
+
+	attnamelist ::=  Name attrib {‘,’ Name attrib}
+
+	attrib ::= [‘<’ Name ‘>’]
+
+	retstat ::= return [explist] [‘;’]
+
+	label ::= ‘::’ Name ‘::’
+
+	funcname ::= Name {‘.’ Name} [‘:’ Name]
+
+	varlist ::= var {‘,’ var}
+
+	var ::=  Name | prefixexp ‘[’ exp ‘]’ | prefixexp ‘.’ Name 
+
+	namelist ::= Name {‘,’ Name}
+
+	explist ::= exp {‘,’ exp}
+
+	exp ::=  nil | false | true | Numeral | LiteralString | ‘...’ | functiondef | 
+		 prefixexp | tableconstructor | exp binop exp | unop exp 
+
+	prefixexp ::= var | functioncall | ‘(’ exp ‘)’
+
+	functioncall ::=  prefixexp args | prefixexp ‘:’ Name args 
+
+	args ::=  ‘(’ [explist] ‘)’ | tableconstructor | LiteralString 
+
+	functiondef ::= function funcbody
+
+	funcbody ::= ‘(’ [parlist] ‘)’ block end
+
+	parlist ::= namelist [‘,’ ‘...’] | ‘...’
+
+	tableconstructor ::= ‘{’ [fieldlist] ‘}’
+
+	fieldlist ::= field {fieldsep field} [fieldsep]
+
+	field ::= ‘[’ exp ‘]’ ‘=’ exp | Name ‘=’ exp | exp
+
+	fieldsep ::= ‘,’ | ‘;’
+
+	binop ::=  ‘+’ | ‘-’ | ‘*’ | ‘/’ | ‘//’ | ‘^’ | ‘%’ | 
+		 ‘&’ | ‘~’ | ‘|’ | ‘>>’ | ‘<<’ | ‘..’ | 
+		 ‘<’ | ‘<=’ | ‘>’ | ‘>=’ | ‘==’ | ‘~=’ | 
+		 and | or
+
+	unop ::= ‘-’ | not | ‘#’ | ‘~’
+
+
+ +

+ + + + + + + +

+Last update: +Tue May 2 20:09:38 UTC 2023 +

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+Lua +Welcome to Lua 5.4 +

+ +
+about +· +installation +· +changes +· +license +· +reference manual +
+ +

About Lua

+

+Lua is a powerful, efficient, lightweight, embeddable scripting language +developed by a +team +at +PUC-Rio, +the Pontifical Catholic University of Rio de Janeiro in Brazil. +Lua is +free software +used in +many products and projects +around the world. + +

+Lua's +official web site +provides complete information +about Lua, +including +an +executive summary +and +updated +documentation, +especially the +reference manual, +which may differ slightly from the +local copy +distributed in this package. + +

Installing Lua

+

+Lua is distributed in +source +form. +You need to build it before using it. +Building Lua should be straightforward +because +Lua is implemented in pure ANSI C and compiles unmodified in all known +platforms that have an ANSI C compiler. +Lua also compiles unmodified as C++. +The instructions given below for building Lua are for Unix-like platforms, +such as Linux and Mac OS X. +See also +instructions for other systems +and +customization options. + +

+If you don't have the time or the inclination to compile Lua yourself, +get a binary from +LuaBinaries. + +

Building Lua

+

+In most common Unix-like platforms, simply do "make". +Here are the details. + +

    +
  1. +Open a terminal window and move to +the top-level directory, which is named lua-5.4.6. +The Makefile there controls both the build process and the installation process. +

    +

  2. + Do "make". The Makefile will guess your platform and build Lua for it. +

    +

  3. + If the guess failed, do "make help" and see if your platform is listed. + The platforms currently supported are: +

    +

    + guess aix bsd c89 freebsd generic ios linux linux-readline macosx mingw posix solaris +

    +

    + If your platform is listed, just do "make xxx", where xxx + is your platform name. +

    + If your platform is not listed, try the closest one or posix, generic, + c89, in this order. +

    +

  4. +The compilation takes only a few moments +and produces three files in the src directory: +lua (the interpreter), +luac (the compiler), +and liblua.a (the library). +

    +

  5. + To check that Lua has been built correctly, do "make test" + after building Lua. This will run the interpreter and print its version. +
+

+If you're running Linux, try "make linux-readline" to build the interactive Lua interpreter with handy line-editing and history capabilities. +If you get compilation errors, +make sure you have installed the readline development package +(which is probably named libreadline-dev or readline-devel). +If you get link errors after that, +then try "make linux-readline MYLIBS=-ltermcap". + +

Installing Lua

+

+ Once you have built Lua, you may want to install it in an official + place in your system. In this case, do "make install". The official + place and the way to install files are defined in the Makefile. You'll + probably need the right permissions to install files, and so may need to do "sudo make install". + +

+ To build and install Lua in one step, do "make all install", + or "make xxx install", + where xxx is your platform name. + +

+ To install Lua locally after building it, do "make local". + This will create a directory install with subdirectories + bin, include, lib, man, share, + and install Lua as listed below. + + To install Lua locally, but in some other directory, do + "make install INSTALL_TOP=xxx", where xxx is your chosen directory. + The installation starts in the src and doc directories, + so take care if INSTALL_TOP is not an absolute path. + +

+
+ bin: +
+ lua luac +
+ include: +
+ lua.h luaconf.h lualib.h lauxlib.h lua.hpp +
+ lib: +
+ liblua.a +
+ man/man1: +
+ lua.1 luac.1 +
+ +

+ These are the only directories you need for development. + If you only want to run Lua programs, + you only need the files in bin and man. + The files in include and lib are needed for + embedding Lua in C or C++ programs. + +

Customization

+

+ Three kinds of things can be customized by editing a file: +

    +
  • Where and how to install Lua — edit Makefile. +
  • How to build Lua — edit src/Makefile. +
  • Lua features — edit src/luaconf.h. +
+ +

+ You don't actually need to edit the Makefiles because you may set the + relevant variables in the command line when invoking make. + Nevertheless, it's probably best to edit and save the Makefiles to + record the changes you've made. + +

+ On the other hand, if you need to customize some Lua features, you'll need + to edit src/luaconf.h before building and installing Lua. + The edited file will be the one installed, and + it will be used by any Lua clients that you build, to ensure consistency. + Further customization is available to experts by editing the Lua sources. + +

Building Lua on other systems

+

+ If you're not using the usual Unix tools, then the instructions for + building Lua depend on the compiler you use. You'll need to create + projects (or whatever your compiler uses) for building the library, + the interpreter, and the compiler, as follows: + +

+
+library: +
+lapi.c lcode.c lctype.c ldebug.c ldo.c ldump.c lfunc.c lgc.c llex.c lmem.c lobject.c lopcodes.c lparser.c lstate.c lstring.c ltable.c ltm.c lundump.c lvm.c lzio.c +lauxlib.c lbaselib.c lcorolib.c ldblib.c liolib.c lmathlib.c loadlib.c loslib.c lstrlib.c ltablib.c lutf8lib.c linit.c +
+interpreter: +
+ library, lua.c +
+compiler: +
+ library, luac.c +
+ +

+ To use Lua as a library in your own programs, you'll need to know how to + create and use libraries with your compiler. Moreover, to dynamically load + C libraries for Lua, you'll need to know how to create dynamic libraries + and you'll need to make sure that the Lua API functions are accessible to + those dynamic libraries — but don't link the Lua library + into each dynamic library. For Unix, we recommend that the Lua library + be linked statically into the host program and its symbols exported for + dynamic linking; src/Makefile does this for the Lua interpreter. + For Windows, we recommend that the Lua library be a DLL. + In all cases, the compiler luac should be linked statically. + +

+ As mentioned above, you may edit src/luaconf.h to customize + some features before building Lua. + +

Changes since Lua 5.3

+

+Here are the main changes introduced in Lua 5.4. +The +reference manual +lists the +incompatibilities that had to be introduced. + +

Main changes

+
    +
  • new generational mode for garbage collection +
  • to-be-closed variables +
  • const variables +
  • userdata can have multiple user values +
  • new implementation for math.random +
  • warning system +
  • debug information about function arguments and returns +
  • new semantics for the integer 'for' loop +
  • optional 'init' argument to 'string.gmatch' +
  • new functions 'lua_resetthread' and 'coroutine.close' +
  • string-to-number coercions moved to the string library +
  • allocation function allowed to fail when shrinking a memory block +
  • new format '%p' in 'string.format' +
  • utf8 library accepts codepoints up to 2^31 +
+ +

License

+

+ +[osi certified] + +Lua is free software distributed under the terms of the +MIT license +reproduced below; +it may be used for any purpose, including commercial purposes, +at absolutely no cost without having to ask us. + +The only requirement is that if you do use Lua, +then you should give us credit by including the appropriate copyright notice somewhere in your product or its documentation. + +For details, see +this. + +

+Copyright © 1994–2023 Lua.org, PUC-Rio. + +

+Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +

+The above copyright notice and this permission notice shall be included in +all copies or substantial portions of the Software. + +

+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +THE SOFTWARE. +

+

+ +

+Last update: +Tue May 2 20:08:55 UTC 2023 +

+ + + + diff --git a/06/lua-5.4.6/src/Makefile b/06/lua-5.4.6/src/Makefile new file mode 100644 index 0000000..694a3fb --- /dev/null +++ b/06/lua-5.4.6/src/Makefile @@ -0,0 +1,225 @@ +# Makefile for building Lua +# See ../doc/readme.html for installation and customization instructions. + +# == CHANGE THE SETTINGS BELOW TO SUIT YOUR ENVIRONMENT ======================= + +# Your platform. See PLATS for possible values. +PLAT= linux + +CC= ../../../05/tcc-0.9.27/tcc +CFLAGS= -nostdinc -B ../../../05/tcc-boostrap -I ../../../05/musl-bootstrap/include $(SYSCFLAGS) $(MYCFLAGS) +LDFLAGS= -nostdlib $(SYSLDFLAGS) $(MYLDFLAGS) +LIBS= $(SYSLIBS) $(MYLIBS) + +AR= ../../../05/tcc-0.9.27/tcc -ar rc +RANLIB= ranlib +RM= rm -f +UNAME= uname + +SYSCFLAGS= +SYSLDFLAGS= +SYSLIBS= + +MYCFLAGS= +MYLDFLAGS= +MYLIBS= +MYOBJS= + +# Special flags for compiler modules; -Os reduces code size. +CMCFLAGS= + +# == END OF USER SETTINGS -- NO NEED TO CHANGE ANYTHING BELOW THIS LINE ======= + +PLATS= guess aix bsd c89 freebsd generic ios linux linux-readline macosx mingw posix solaris + +LUA_A= liblua.a +CORE_O= lapi.o lcode.o lctype.o ldebug.o ldo.o ldump.o lfunc.o lgc.o llex.o lmem.o lobject.o lopcodes.o lparser.o lstate.o lstring.o ltable.o ltm.o lundump.o lvm.o lzio.o +LIB_O= lauxlib.o lbaselib.o lcorolib.o ldblib.o liolib.o lmathlib.o loadlib.o loslib.o lstrlib.o ltablib.o lutf8lib.o linit.o +BASE_O= $(CORE_O) $(LIB_O) $(MYOBJS) + +LUA_T= lua +LUA_O= lua.o + +LUAC_T= luac +LUAC_O= luac.o + +ALL_O= $(BASE_O) $(LUA_O) $(LUAC_O) +ALL_T= $(LUA_A) $(LUA_T) $(LUAC_T) +ALL_A= $(LUA_A) + +# Targets start here. +default: $(PLAT) + +all: $(ALL_T) + +o: $(ALL_O) + +a: $(ALL_A) + +$(LUA_A): $(BASE_O) + $(AR) $@ $(BASE_O) + $(RANLIB) $@ + +$(LUA_T): $(LUA_O) $(LUA_A) + $(CC) -o $@ $(LDFLAGS) $(LUA_O) $(LUA_A) $(LIBS) ../../../05/musl-bootstrap/lib/*.[oa] + +$(LUAC_T): $(LUAC_O) $(LUA_A) + $(CC) -o $@ $(LDFLAGS) $(LUAC_O) $(LUA_A) $(LIBS) ../../../05/musl-bootstrap/lib/*.[oa] + +test: + ./$(LUA_T) -v + +clean: + $(RM) $(ALL_T) $(ALL_O) + +depend: + @$(CC) $(CFLAGS) -MM l*.c + +echo: + @echo "PLAT= $(PLAT)" + @echo "CC= $(CC)" + @echo "CFLAGS= $(CFLAGS)" + @echo "LDFLAGS= $(LDFLAGS)" + @echo "LIBS= $(LIBS)" + @echo "AR= $(AR)" + @echo "RANLIB= $(RANLIB)" + @echo "RM= $(RM)" + @echo "UNAME= $(UNAME)" + +# Convenience targets for popular platforms. +ALL= all + +help: + @echo "Do 'make PLATFORM' where PLATFORM is one of these:" + @echo " $(PLATS)" + @echo "See doc/readme.html for complete instructions." + +guess: + @echo Guessing `$(UNAME)` + @$(MAKE) `$(UNAME)` + +AIX aix: + $(MAKE) $(ALL) CC="xlc" CFLAGS="-O2 -DLUA_USE_POSIX -DLUA_USE_DLOPEN" SYSLIBS="-ldl" SYSLDFLAGS="-brtl -bexpall" + +bsd: + $(MAKE) $(ALL) SYSCFLAGS="-DLUA_USE_POSIX -DLUA_USE_DLOPEN" SYSLIBS="-Wl,-E" + +c89: + $(MAKE) $(ALL) SYSCFLAGS="-DLUA_USE_C89" + @echo '' + @echo '*** C89 does not guarantee 64-bit integers for Lua.' + @echo '*** Make sure to compile all external Lua libraries' + @echo '*** with LUA_USE_C89 to ensure consistency' + @echo '' + +FreeBSD NetBSD OpenBSD freebsd: + $(MAKE) $(ALL) SYSCFLAGS="-DLUA_USE_LINUX -DLUA_USE_READLINE -I/usr/include/edit" SYSLIBS="-Wl,-E -ledit" CC="cc" + +generic: $(ALL) + +ios: + $(MAKE) $(ALL) SYSCFLAGS="-DLUA_USE_IOS" + +Linux linux: linux-noreadline + +linux-noreadline: + $(MAKE) $(ALL) SYSCFLAGS="-DLUA_USE_LINUX" SYSLIBS="-Wl,-E -ldl" + +linux-readline: + $(MAKE) $(ALL) SYSCFLAGS="-DLUA_USE_LINUX -DLUA_USE_READLINE" SYSLIBS="-Wl,-E -ldl -lreadline" + +Darwin macos macosx: + $(MAKE) $(ALL) SYSCFLAGS="-DLUA_USE_MACOSX -DLUA_USE_READLINE" SYSLIBS="-lreadline" + +mingw: + $(MAKE) "LUA_A=lua54.dll" "LUA_T=lua.exe" \ + "AR=$(CC) -shared -o" "RANLIB=strip --strip-unneeded" \ + "SYSCFLAGS=-DLUA_BUILD_AS_DLL" "SYSLIBS=" "SYSLDFLAGS=-s" lua.exe + $(MAKE) "LUAC_T=luac.exe" luac.exe + +posix: + $(MAKE) $(ALL) SYSCFLAGS="-DLUA_USE_POSIX" + +SunOS solaris: + $(MAKE) $(ALL) SYSCFLAGS="-DLUA_USE_POSIX -DLUA_USE_DLOPEN -D_REENTRANT" SYSLIBS="-ldl" + +# Targets that do not create files (not all makes understand .PHONY). +.PHONY: all $(PLATS) help test clean default o a depend echo + +# Compiler modules may use special flags. +llex.o: + $(CC) $(CFLAGS) $(CMCFLAGS) -c llex.c + +lparser.o: + $(CC) $(CFLAGS) $(CMCFLAGS) -c lparser.c + +lcode.o: + $(CC) $(CFLAGS) $(CMCFLAGS) -c lcode.c + +# DO NOT DELETE + +lapi.o: lapi.c lprefix.h lua.h luaconf.h lapi.h llimits.h lstate.h \ + lobject.h ltm.h lzio.h lmem.h ldebug.h ldo.h lfunc.h lgc.h lstring.h \ + ltable.h lundump.h lvm.h +lauxlib.o: lauxlib.c lprefix.h lua.h luaconf.h lauxlib.h +lbaselib.o: lbaselib.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h +lcode.o: lcode.c lprefix.h lua.h luaconf.h lcode.h llex.h lobject.h \ + llimits.h lzio.h lmem.h lopcodes.h lparser.h ldebug.h lstate.h ltm.h \ + ldo.h lgc.h lstring.h ltable.h lvm.h +lcorolib.o: lcorolib.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h +lctype.o: lctype.c lprefix.h lctype.h lua.h luaconf.h llimits.h +ldblib.o: ldblib.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h +ldebug.o: ldebug.c lprefix.h lua.h luaconf.h lapi.h llimits.h lstate.h \ + lobject.h ltm.h lzio.h lmem.h lcode.h llex.h lopcodes.h lparser.h \ + ldebug.h ldo.h lfunc.h lstring.h lgc.h ltable.h lvm.h +ldo.o: ldo.c lprefix.h lua.h luaconf.h lapi.h llimits.h lstate.h \ + lobject.h ltm.h lzio.h lmem.h ldebug.h ldo.h lfunc.h lgc.h lopcodes.h \ + lparser.h lstring.h ltable.h lundump.h lvm.h +ldump.o: ldump.c lprefix.h lua.h luaconf.h lobject.h llimits.h lstate.h \ + ltm.h lzio.h lmem.h lundump.h +lfunc.o: lfunc.c lprefix.h lua.h luaconf.h ldebug.h lstate.h lobject.h \ + llimits.h ltm.h lzio.h lmem.h ldo.h lfunc.h lgc.h +lgc.o: lgc.c lprefix.h lua.h luaconf.h ldebug.h lstate.h lobject.h \ + llimits.h ltm.h lzio.h lmem.h ldo.h lfunc.h lgc.h lstring.h ltable.h +linit.o: linit.c lprefix.h lua.h luaconf.h lualib.h lauxlib.h +liolib.o: liolib.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h +llex.o: llex.c lprefix.h lua.h luaconf.h lctype.h llimits.h ldebug.h \ + lstate.h lobject.h ltm.h lzio.h lmem.h ldo.h lgc.h llex.h lparser.h \ + lstring.h ltable.h +lmathlib.o: lmathlib.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h +lmem.o: lmem.c lprefix.h lua.h luaconf.h ldebug.h lstate.h lobject.h \ + llimits.h ltm.h lzio.h lmem.h ldo.h lgc.h +loadlib.o: loadlib.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h +lobject.o: lobject.c lprefix.h lua.h luaconf.h lctype.h llimits.h \ + ldebug.h lstate.h lobject.h ltm.h lzio.h lmem.h ldo.h lstring.h lgc.h \ + lvm.h +lopcodes.o: lopcodes.c lprefix.h lopcodes.h llimits.h lua.h luaconf.h +loslib.o: loslib.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h +lparser.o: lparser.c lprefix.h lua.h luaconf.h lcode.h llex.h lobject.h \ + llimits.h lzio.h lmem.h lopcodes.h lparser.h ldebug.h lstate.h ltm.h \ + ldo.h lfunc.h lstring.h lgc.h ltable.h +lstate.o: lstate.c lprefix.h lua.h luaconf.h lapi.h llimits.h lstate.h \ + lobject.h ltm.h lzio.h lmem.h ldebug.h ldo.h lfunc.h lgc.h llex.h \ + lstring.h ltable.h +lstring.o: lstring.c lprefix.h lua.h luaconf.h ldebug.h lstate.h \ + lobject.h llimits.h ltm.h lzio.h lmem.h ldo.h lstring.h lgc.h +lstrlib.o: lstrlib.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h +ltable.o: ltable.c lprefix.h lua.h luaconf.h ldebug.h lstate.h lobject.h \ + llimits.h ltm.h lzio.h lmem.h ldo.h lgc.h lstring.h ltable.h lvm.h +ltablib.o: ltablib.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h +ltm.o: ltm.c lprefix.h lua.h luaconf.h ldebug.h lstate.h lobject.h \ + llimits.h ltm.h lzio.h lmem.h ldo.h lgc.h lstring.h ltable.h lvm.h +lua.o: lua.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h +luac.o: luac.c lprefix.h lua.h luaconf.h lauxlib.h ldebug.h lstate.h \ + lobject.h llimits.h ltm.h lzio.h lmem.h lopcodes.h lopnames.h lundump.h +lundump.o: lundump.c lprefix.h lua.h luaconf.h ldebug.h lstate.h \ + lobject.h llimits.h ltm.h lzio.h lmem.h ldo.h lfunc.h lstring.h lgc.h \ + lundump.h +lutf8lib.o: lutf8lib.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h +lvm.o: lvm.c lprefix.h lua.h luaconf.h ldebug.h lstate.h lobject.h \ + llimits.h ltm.h lzio.h lmem.h ldo.h lfunc.h lgc.h lopcodes.h lstring.h \ + ltable.h lvm.h ljumptab.h +lzio.o: lzio.c lprefix.h lua.h luaconf.h llimits.h lmem.h lstate.h \ + lobject.h ltm.h lzio.h + +# (end of Makefile) diff --git a/06/lua-5.4.6/src/lapi.c b/06/lua-5.4.6/src/lapi.c new file mode 100644 index 0000000..34e64af --- /dev/null +++ b/06/lua-5.4.6/src/lapi.c @@ -0,0 +1,1463 @@ +/* +** $Id: lapi.c $ +** Lua API +** See Copyright Notice in lua.h +*/ + +#define lapi_c +#define LUA_CORE + +#include "lprefix.h" + + +#include +#include +#include + +#include "lua.h" + +#include "lapi.h" +#include "ldebug.h" +#include "ldo.h" +#include "lfunc.h" +#include "lgc.h" +#include "lmem.h" +#include "lobject.h" +#include "lstate.h" +#include "lstring.h" +#include "ltable.h" +#include "ltm.h" +#include "lundump.h" +#include "lvm.h" + + + +const char lua_ident[] = + "$LuaVersion: " LUA_COPYRIGHT " $" + "$LuaAuthors: " LUA_AUTHORS " $"; + + + +/* +** Test for a valid index (one that is not the 'nilvalue'). +** '!ttisnil(o)' implies 'o != &G(L)->nilvalue', so it is not needed. +** However, it covers the most common cases in a faster way. +*/ +#define isvalid(L, o) (!ttisnil(o) || o != &G(L)->nilvalue) + + +/* test for pseudo index */ +#define ispseudo(i) ((i) <= LUA_REGISTRYINDEX) + +/* test for upvalue */ +#define isupvalue(i) ((i) < LUA_REGISTRYINDEX) + + +/* +** Convert an acceptable index to a pointer to its respective value. +** Non-valid indices return the special nil value 'G(L)->nilvalue'. +*/ +static TValue *index2value (lua_State *L, int idx) { + CallInfo *ci = L->ci; + if (idx > 0) { + StkId o = ci->func.p + idx; + api_check(L, idx <= ci->top.p - (ci->func.p + 1), "unacceptable index"); + if (o >= L->top.p) return &G(L)->nilvalue; + else return s2v(o); + } + else if (!ispseudo(idx)) { /* negative index */ + api_check(L, idx != 0 && -idx <= L->top.p - (ci->func.p + 1), + "invalid index"); + return s2v(L->top.p + idx); + } + else if (idx == LUA_REGISTRYINDEX) + return &G(L)->l_registry; + else { /* upvalues */ + idx = LUA_REGISTRYINDEX - idx; + api_check(L, idx <= MAXUPVAL + 1, "upvalue index too large"); + if (ttisCclosure(s2v(ci->func.p))) { /* C closure? */ + CClosure *func = clCvalue(s2v(ci->func.p)); + return (idx <= func->nupvalues) ? &func->upvalue[idx-1] + : &G(L)->nilvalue; + } + else { /* light C function or Lua function (through a hook)?) */ + api_check(L, ttislcf(s2v(ci->func.p)), "caller not a C function"); + return &G(L)->nilvalue; /* no upvalues */ + } + } +} + + + +/* +** Convert a valid actual index (not a pseudo-index) to its address. +*/ +l_sinline StkId index2stack (lua_State *L, int idx) { + CallInfo *ci = L->ci; + if (idx > 0) { + StkId o = ci->func.p + idx; + api_check(L, o < L->top.p, "invalid index"); + return o; + } + else { /* non-positive index */ + api_check(L, idx != 0 && -idx <= L->top.p - (ci->func.p + 1), + "invalid index"); + api_check(L, !ispseudo(idx), "invalid index"); + return L->top.p + idx; + } +} + + +LUA_API int lua_checkstack (lua_State *L, int n) { + int res; + CallInfo *ci; + lua_lock(L); + ci = L->ci; + api_check(L, n >= 0, "negative 'n'"); + if (L->stack_last.p - L->top.p > n) /* stack large enough? */ + res = 1; /* yes; check is OK */ + else /* need to grow stack */ + res = luaD_growstack(L, n, 0); + if (res && ci->top.p < L->top.p + n) + ci->top.p = L->top.p + n; /* adjust frame top */ + lua_unlock(L); + return res; +} + + +LUA_API void lua_xmove (lua_State *from, lua_State *to, int n) { + int i; + if (from == to) return; + lua_lock(to); + api_checknelems(from, n); + api_check(from, G(from) == G(to), "moving among independent states"); + api_check(from, to->ci->top.p - to->top.p >= n, "stack overflow"); + from->top.p -= n; + for (i = 0; i < n; i++) { + setobjs2s(to, to->top.p, from->top.p + i); + to->top.p++; /* stack already checked by previous 'api_check' */ + } + lua_unlock(to); +} + + +LUA_API lua_CFunction lua_atpanic (lua_State *L, lua_CFunction panicf) { + lua_CFunction old; + lua_lock(L); + old = G(L)->panic; + G(L)->panic = panicf; + lua_unlock(L); + return old; +} + + +LUA_API lua_Number lua_version (lua_State *L) { + UNUSED(L); + return LUA_VERSION_NUM; +} + + + +/* +** basic stack manipulation +*/ + + +/* +** convert an acceptable stack index into an absolute index +*/ +LUA_API int lua_absindex (lua_State *L, int idx) { + return (idx > 0 || ispseudo(idx)) + ? idx + : cast_int(L->top.p - L->ci->func.p) + idx; +} + + +LUA_API int lua_gettop (lua_State *L) { + return cast_int(L->top.p - (L->ci->func.p + 1)); +} + + +LUA_API void lua_settop (lua_State *L, int idx) { + CallInfo *ci; + StkId func, newtop; + ptrdiff_t diff; /* difference for new top */ + lua_lock(L); + ci = L->ci; + func = ci->func.p; + if (idx >= 0) { + api_check(L, idx <= ci->top.p - (func + 1), "new top too large"); + diff = ((func + 1) + idx) - L->top.p; + for (; diff > 0; diff--) + setnilvalue(s2v(L->top.p++)); /* clear new slots */ + } + else { + api_check(L, -(idx+1) <= (L->top.p - (func + 1)), "invalid new top"); + diff = idx + 1; /* will "subtract" index (as it is negative) */ + } + api_check(L, L->tbclist.p < L->top.p, "previous pop of an unclosed slot"); + newtop = L->top.p + diff; + if (diff < 0 && L->tbclist.p >= newtop) { + lua_assert(hastocloseCfunc(ci->nresults)); + newtop = luaF_close(L, newtop, CLOSEKTOP, 0); + } + L->top.p = newtop; /* correct top only after closing any upvalue */ + lua_unlock(L); +} + + +LUA_API void lua_closeslot (lua_State *L, int idx) { + StkId level; + lua_lock(L); + level = index2stack(L, idx); + api_check(L, hastocloseCfunc(L->ci->nresults) && L->tbclist.p == level, + "no variable to close at given level"); + level = luaF_close(L, level, CLOSEKTOP, 0); + setnilvalue(s2v(level)); + lua_unlock(L); +} + + +/* +** Reverse the stack segment from 'from' to 'to' +** (auxiliary to 'lua_rotate') +** Note that we move(copy) only the value inside the stack. +** (We do not move additional fields that may exist.) +*/ +l_sinline void reverse (lua_State *L, StkId from, StkId to) { + for (; from < to; from++, to--) { + TValue temp; + setobj(L, &temp, s2v(from)); + setobjs2s(L, from, to); + setobj2s(L, to, &temp); + } +} + + +/* +** Let x = AB, where A is a prefix of length 'n'. Then, +** rotate x n == BA. But BA == (A^r . B^r)^r. +*/ +LUA_API void lua_rotate (lua_State *L, int idx, int n) { + StkId p, t, m; + lua_lock(L); + t = L->top.p - 1; /* end of stack segment being rotated */ + p = index2stack(L, idx); /* start of segment */ + api_check(L, (n >= 0 ? n : -n) <= (t - p + 1), "invalid 'n'"); + m = (n >= 0 ? t - n : p - n - 1); /* end of prefix */ + reverse(L, p, m); /* reverse the prefix with length 'n' */ + reverse(L, m + 1, t); /* reverse the suffix */ + reverse(L, p, t); /* reverse the entire segment */ + lua_unlock(L); +} + + +LUA_API void lua_copy (lua_State *L, int fromidx, int toidx) { + TValue *fr, *to; + lua_lock(L); + fr = index2value(L, fromidx); + to = index2value(L, toidx); + api_check(L, isvalid(L, to), "invalid index"); + setobj(L, to, fr); + if (isupvalue(toidx)) /* function upvalue? */ + luaC_barrier(L, clCvalue(s2v(L->ci->func.p)), fr); + /* LUA_REGISTRYINDEX does not need gc barrier + (collector revisits it before finishing collection) */ + lua_unlock(L); +} + + +LUA_API void lua_pushvalue (lua_State *L, int idx) { + lua_lock(L); + setobj2s(L, L->top.p, index2value(L, idx)); + api_incr_top(L); + lua_unlock(L); +} + + + +/* +** access functions (stack -> C) +*/ + + +LUA_API int lua_type (lua_State *L, int idx) { + const TValue *o = index2value(L, idx); + return (isvalid(L, o) ? ttype(o) : LUA_TNONE); +} + + +LUA_API const char *lua_typename (lua_State *L, int t) { + UNUSED(L); + api_check(L, LUA_TNONE <= t && t < LUA_NUMTYPES, "invalid type"); + return ttypename(t); +} + + +LUA_API int lua_iscfunction (lua_State *L, int idx) { + const TValue *o = index2value(L, idx); + return (ttislcf(o) || (ttisCclosure(o))); +} + + +LUA_API int lua_isinteger (lua_State *L, int idx) { + const TValue *o = index2value(L, idx); + return ttisinteger(o); +} + + +LUA_API int lua_isnumber (lua_State *L, int idx) { + lua_Number n; + const TValue *o = index2value(L, idx); + return tonumber(o, &n); +} + + +LUA_API int lua_isstring (lua_State *L, int idx) { + const TValue *o = index2value(L, idx); + return (ttisstring(o) || cvt2str(o)); +} + + +LUA_API int lua_isuserdata (lua_State *L, int idx) { + const TValue *o = index2value(L, idx); + return (ttisfulluserdata(o) || ttislightuserdata(o)); +} + + +LUA_API int lua_rawequal (lua_State *L, int index1, int index2) { + const TValue *o1 = index2value(L, index1); + const TValue *o2 = index2value(L, index2); + return (isvalid(L, o1) && isvalid(L, o2)) ? luaV_rawequalobj(o1, o2) : 0; +} + + +LUA_API void lua_arith (lua_State *L, int op) { + lua_lock(L); + if (op != LUA_OPUNM && op != LUA_OPBNOT) + api_checknelems(L, 2); /* all other operations expect two operands */ + else { /* for unary operations, add fake 2nd operand */ + api_checknelems(L, 1); + setobjs2s(L, L->top.p, L->top.p - 1); + api_incr_top(L); + } + /* first operand at top - 2, second at top - 1; result go to top - 2 */ + luaO_arith(L, op, s2v(L->top.p - 2), s2v(L->top.p - 1), L->top.p - 2); + L->top.p--; /* remove second operand */ + lua_unlock(L); +} + + +LUA_API int lua_compare (lua_State *L, int index1, int index2, int op) { + const TValue *o1; + const TValue *o2; + int i = 0; + lua_lock(L); /* may call tag method */ + o1 = index2value(L, index1); + o2 = index2value(L, index2); + if (isvalid(L, o1) && isvalid(L, o2)) { + switch (op) { + case LUA_OPEQ: i = luaV_equalobj(L, o1, o2); break; + case LUA_OPLT: i = luaV_lessthan(L, o1, o2); break; + case LUA_OPLE: i = luaV_lessequal(L, o1, o2); break; + default: api_check(L, 0, "invalid option"); + } + } + lua_unlock(L); + return i; +} + + +LUA_API size_t lua_stringtonumber (lua_State *L, const char *s) { + size_t sz = luaO_str2num(s, s2v(L->top.p)); + if (sz != 0) + api_incr_top(L); + return sz; +} + + +LUA_API lua_Number lua_tonumberx (lua_State *L, int idx, int *pisnum) { + lua_Number n = 0; + const TValue *o = index2value(L, idx); + int isnum = tonumber(o, &n); + if (pisnum) + *pisnum = isnum; + return n; +} + + +LUA_API lua_Integer lua_tointegerx (lua_State *L, int idx, int *pisnum) { + lua_Integer res = 0; + const TValue *o = index2value(L, idx); + int isnum = tointeger(o, &res); + if (pisnum) + *pisnum = isnum; + return res; +} + + +LUA_API int lua_toboolean (lua_State *L, int idx) { + const TValue *o = index2value(L, idx); + return !l_isfalse(o); +} + + +LUA_API const char *lua_tolstring (lua_State *L, int idx, size_t *len) { + TValue *o; + lua_lock(L); + o = index2value(L, idx); + if (!ttisstring(o)) { + if (!cvt2str(o)) { /* not convertible? */ + if (len != NULL) *len = 0; + lua_unlock(L); + return NULL; + } + luaO_tostring(L, o); + luaC_checkGC(L); + o = index2value(L, idx); /* previous call may reallocate the stack */ + } + if (len != NULL) + *len = vslen(o); + lua_unlock(L); + return svalue(o); +} + + +LUA_API lua_Unsigned lua_rawlen (lua_State *L, int idx) { + const TValue *o = index2value(L, idx); + switch (ttypetag(o)) { + case LUA_VSHRSTR: return tsvalue(o)->shrlen; + case LUA_VLNGSTR: return tsvalue(o)->u.lnglen; + case LUA_VUSERDATA: return uvalue(o)->len; + case LUA_VTABLE: return luaH_getn(hvalue(o)); + default: return 0; + } +} + + +LUA_API lua_CFunction lua_tocfunction (lua_State *L, int idx) { + const TValue *o = index2value(L, idx); + if (ttislcf(o)) return fvalue(o); + else if (ttisCclosure(o)) + return clCvalue(o)->f; + else return NULL; /* not a C function */ +} + + +l_sinline void *touserdata (const TValue *o) { + switch (ttype(o)) { + case LUA_TUSERDATA: return getudatamem(uvalue(o)); + case LUA_TLIGHTUSERDATA: return pvalue(o); + default: return NULL; + } +} + + +LUA_API void *lua_touserdata (lua_State *L, int idx) { + const TValue *o = index2value(L, idx); + return touserdata(o); +} + + +LUA_API lua_State *lua_tothread (lua_State *L, int idx) { + const TValue *o = index2value(L, idx); + return (!ttisthread(o)) ? NULL : thvalue(o); +} + + +/* +** Returns a pointer to the internal representation of an object. +** Note that ANSI C does not allow the conversion of a pointer to +** function to a 'void*', so the conversion here goes through +** a 'size_t'. (As the returned pointer is only informative, this +** conversion should not be a problem.) +*/ +LUA_API const void *lua_topointer (lua_State *L, int idx) { + const TValue *o = index2value(L, idx); + switch (ttypetag(o)) { + case LUA_VLCF: return cast_voidp(cast_sizet(fvalue(o))); + case LUA_VUSERDATA: case LUA_VLIGHTUSERDATA: + return touserdata(o); + default: { + if (iscollectable(o)) + return gcvalue(o); + else + return NULL; + } + } +} + + + +/* +** push functions (C -> stack) +*/ + + +LUA_API void lua_pushnil (lua_State *L) { + lua_lock(L); + setnilvalue(s2v(L->top.p)); + api_incr_top(L); + lua_unlock(L); +} + + +LUA_API void lua_pushnumber (lua_State *L, lua_Number n) { + lua_lock(L); + setfltvalue(s2v(L->top.p), n); + api_incr_top(L); + lua_unlock(L); +} + + +LUA_API void lua_pushinteger (lua_State *L, lua_Integer n) { + lua_lock(L); + setivalue(s2v(L->top.p), n); + api_incr_top(L); + lua_unlock(L); +} + + +/* +** Pushes on the stack a string with given length. Avoid using 's' when +** 'len' == 0 (as 's' can be NULL in that case), due to later use of +** 'memcmp' and 'memcpy'. +*/ +LUA_API const char *lua_pushlstring (lua_State *L, const char *s, size_t len) { + TString *ts; + lua_lock(L); + ts = (len == 0) ? luaS_new(L, "") : luaS_newlstr(L, s, len); + setsvalue2s(L, L->top.p, ts); + api_incr_top(L); + luaC_checkGC(L); + lua_unlock(L); + return getstr(ts); +} + + +LUA_API const char *lua_pushstring (lua_State *L, const char *s) { + lua_lock(L); + if (s == NULL) + setnilvalue(s2v(L->top.p)); + else { + TString *ts; + ts = luaS_new(L, s); + setsvalue2s(L, L->top.p, ts); + s = getstr(ts); /* internal copy's address */ + } + api_incr_top(L); + luaC_checkGC(L); + lua_unlock(L); + return s; +} + + +LUA_API const char *lua_pushvfstring (lua_State *L, const char *fmt, + va_list argp) { + const char *ret; + lua_lock(L); + ret = luaO_pushvfstring(L, fmt, argp); + luaC_checkGC(L); + lua_unlock(L); + return ret; +} + + +LUA_API const char *lua_pushfstring (lua_State *L, const char *fmt, ...) { + const char *ret; + va_list argp; + lua_lock(L); + va_start(argp, fmt); + ret = luaO_pushvfstring(L, fmt, argp); + va_end(argp); + luaC_checkGC(L); + lua_unlock(L); + return ret; +} + + +LUA_API void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n) { + lua_lock(L); + if (n == 0) { + setfvalue(s2v(L->top.p), fn); + api_incr_top(L); + } + else { + CClosure *cl; + api_checknelems(L, n); + api_check(L, n <= MAXUPVAL, "upvalue index too large"); + cl = luaF_newCclosure(L, n); + cl->f = fn; + L->top.p -= n; + while (n--) { + setobj2n(L, &cl->upvalue[n], s2v(L->top.p + n)); + /* does not need barrier because closure is white */ + lua_assert(iswhite(cl)); + } + setclCvalue(L, s2v(L->top.p), cl); + api_incr_top(L); + luaC_checkGC(L); + } + lua_unlock(L); +} + + +LUA_API void lua_pushboolean (lua_State *L, int b) { + lua_lock(L); + if (b) + setbtvalue(s2v(L->top.p)); + else + setbfvalue(s2v(L->top.p)); + api_incr_top(L); + lua_unlock(L); +} + + +LUA_API void lua_pushlightuserdata (lua_State *L, void *p) { + lua_lock(L); + setpvalue(s2v(L->top.p), p); + api_incr_top(L); + lua_unlock(L); +} + + +LUA_API int lua_pushthread (lua_State *L) { + lua_lock(L); + setthvalue(L, s2v(L->top.p), L); + api_incr_top(L); + lua_unlock(L); + return (G(L)->mainthread == L); +} + + + +/* +** get functions (Lua -> stack) +*/ + + +l_sinline int auxgetstr (lua_State *L, const TValue *t, const char *k) { + const TValue *slot; + TString *str = luaS_new(L, k); + if (luaV_fastget(L, t, str, slot, luaH_getstr)) { + setobj2s(L, L->top.p, slot); + api_incr_top(L); + } + else { + setsvalue2s(L, L->top.p, str); + api_incr_top(L); + luaV_finishget(L, t, s2v(L->top.p - 1), L->top.p - 1, slot); + } + lua_unlock(L); + return ttype(s2v(L->top.p - 1)); +} + + +/* +** Get the global table in the registry. Since all predefined +** indices in the registry were inserted right when the registry +** was created and never removed, they must always be in the array +** part of the registry. +*/ +#define getGtable(L) \ + (&hvalue(&G(L)->l_registry)->array[LUA_RIDX_GLOBALS - 1]) + + +LUA_API int lua_getglobal (lua_State *L, const char *name) { + const TValue *G; + lua_lock(L); + G = getGtable(L); + return auxgetstr(L, G, name); +} + + +LUA_API int lua_gettable (lua_State *L, int idx) { + const TValue *slot; + TValue *t; + lua_lock(L); + t = index2value(L, idx); + if (luaV_fastget(L, t, s2v(L->top.p - 1), slot, luaH_get)) { + setobj2s(L, L->top.p - 1, slot); + } + else + luaV_finishget(L, t, s2v(L->top.p - 1), L->top.p - 1, slot); + lua_unlock(L); + return ttype(s2v(L->top.p - 1)); +} + + +LUA_API int lua_getfield (lua_State *L, int idx, const char *k) { + lua_lock(L); + return auxgetstr(L, index2value(L, idx), k); +} + + +LUA_API int lua_geti (lua_State *L, int idx, lua_Integer n) { + TValue *t; + const TValue *slot; + lua_lock(L); + t = index2value(L, idx); + if (luaV_fastgeti(L, t, n, slot)) { + setobj2s(L, L->top.p, slot); + } + else { + TValue aux; + setivalue(&aux, n); + luaV_finishget(L, t, &aux, L->top.p, slot); + } + api_incr_top(L); + lua_unlock(L); + return ttype(s2v(L->top.p - 1)); +} + + +l_sinline int finishrawget (lua_State *L, const TValue *val) { + if (isempty(val)) /* avoid copying empty items to the stack */ + setnilvalue(s2v(L->top.p)); + else + setobj2s(L, L->top.p, val); + api_incr_top(L); + lua_unlock(L); + return ttype(s2v(L->top.p - 1)); +} + + +static Table *gettable (lua_State *L, int idx) { + TValue *t = index2value(L, idx); + api_check(L, ttistable(t), "table expected"); + return hvalue(t); +} + + +LUA_API int lua_rawget (lua_State *L, int idx) { + Table *t; + const TValue *val; + lua_lock(L); + api_checknelems(L, 1); + t = gettable(L, idx); + val = luaH_get(t, s2v(L->top.p - 1)); + L->top.p--; /* remove key */ + return finishrawget(L, val); +} + + +LUA_API int lua_rawgeti (lua_State *L, int idx, lua_Integer n) { + Table *t; + lua_lock(L); + t = gettable(L, idx); + return finishrawget(L, luaH_getint(t, n)); +} + + +LUA_API int lua_rawgetp (lua_State *L, int idx, const void *p) { + Table *t; + TValue k; + lua_lock(L); + t = gettable(L, idx); + setpvalue(&k, cast_voidp(p)); + return finishrawget(L, luaH_get(t, &k)); +} + + +LUA_API void lua_createtable (lua_State *L, int narray, int nrec) { + Table *t; + lua_lock(L); + t = luaH_new(L); + sethvalue2s(L, L->top.p, t); + api_incr_top(L); + if (narray > 0 || nrec > 0) + luaH_resize(L, t, narray, nrec); + luaC_checkGC(L); + lua_unlock(L); +} + + +LUA_API int lua_getmetatable (lua_State *L, int objindex) { + const TValue *obj; + Table *mt; + int res = 0; + lua_lock(L); + obj = index2value(L, objindex); + switch (ttype(obj)) { + case LUA_TTABLE: + mt = hvalue(obj)->metatable; + break; + case LUA_TUSERDATA: + mt = uvalue(obj)->metatable; + break; + default: + mt = G(L)->mt[ttype(obj)]; + break; + } + if (mt != NULL) { + sethvalue2s(L, L->top.p, mt); + api_incr_top(L); + res = 1; + } + lua_unlock(L); + return res; +} + + +LUA_API int lua_getiuservalue (lua_State *L, int idx, int n) { + TValue *o; + int t; + lua_lock(L); + o = index2value(L, idx); + api_check(L, ttisfulluserdata(o), "full userdata expected"); + if (n <= 0 || n > uvalue(o)->nuvalue) { + setnilvalue(s2v(L->top.p)); + t = LUA_TNONE; + } + else { + setobj2s(L, L->top.p, &uvalue(o)->uv[n - 1].uv); + t = ttype(s2v(L->top.p)); + } + api_incr_top(L); + lua_unlock(L); + return t; +} + + +/* +** set functions (stack -> Lua) +*/ + +/* +** t[k] = value at the top of the stack (where 'k' is a string) +*/ +static void auxsetstr (lua_State *L, const TValue *t, const char *k) { + const TValue *slot; + TString *str = luaS_new(L, k); + api_checknelems(L, 1); + if (luaV_fastget(L, t, str, slot, luaH_getstr)) { + luaV_finishfastset(L, t, slot, s2v(L->top.p - 1)); + L->top.p--; /* pop value */ + } + else { + setsvalue2s(L, L->top.p, str); /* push 'str' (to make it a TValue) */ + api_incr_top(L); + luaV_finishset(L, t, s2v(L->top.p - 1), s2v(L->top.p - 2), slot); + L->top.p -= 2; /* pop value and key */ + } + lua_unlock(L); /* lock done by caller */ +} + + +LUA_API void lua_setglobal (lua_State *L, const char *name) { + const TValue *G; + lua_lock(L); /* unlock done in 'auxsetstr' */ + G = getGtable(L); + auxsetstr(L, G, name); +} + + +LUA_API void lua_settable (lua_State *L, int idx) { + TValue *t; + const TValue *slot; + lua_lock(L); + api_checknelems(L, 2); + t = index2value(L, idx); + if (luaV_fastget(L, t, s2v(L->top.p - 2), slot, luaH_get)) { + luaV_finishfastset(L, t, slot, s2v(L->top.p - 1)); + } + else + luaV_finishset(L, t, s2v(L->top.p - 2), s2v(L->top.p - 1), slot); + L->top.p -= 2; /* pop index and value */ + lua_unlock(L); +} + + +LUA_API void lua_setfield (lua_State *L, int idx, const char *k) { + lua_lock(L); /* unlock done in 'auxsetstr' */ + auxsetstr(L, index2value(L, idx), k); +} + + +LUA_API void lua_seti (lua_State *L, int idx, lua_Integer n) { + TValue *t; + const TValue *slot; + lua_lock(L); + api_checknelems(L, 1); + t = index2value(L, idx); + if (luaV_fastgeti(L, t, n, slot)) { + luaV_finishfastset(L, t, slot, s2v(L->top.p - 1)); + } + else { + TValue aux; + setivalue(&aux, n); + luaV_finishset(L, t, &aux, s2v(L->top.p - 1), slot); + } + L->top.p--; /* pop value */ + lua_unlock(L); +} + + +static void aux_rawset (lua_State *L, int idx, TValue *key, int n) { + Table *t; + lua_lock(L); + api_checknelems(L, n); + t = gettable(L, idx); + luaH_set(L, t, key, s2v(L->top.p - 1)); + invalidateTMcache(t); + luaC_barrierback(L, obj2gco(t), s2v(L->top.p - 1)); + L->top.p -= n; + lua_unlock(L); +} + + +LUA_API void lua_rawset (lua_State *L, int idx) { + aux_rawset(L, idx, s2v(L->top.p - 2), 2); +} + + +LUA_API void lua_rawsetp (lua_State *L, int idx, const void *p) { + TValue k; + setpvalue(&k, cast_voidp(p)); + aux_rawset(L, idx, &k, 1); +} + + +LUA_API void lua_rawseti (lua_State *L, int idx, lua_Integer n) { + Table *t; + lua_lock(L); + api_checknelems(L, 1); + t = gettable(L, idx); + luaH_setint(L, t, n, s2v(L->top.p - 1)); + luaC_barrierback(L, obj2gco(t), s2v(L->top.p - 1)); + L->top.p--; + lua_unlock(L); +} + + +LUA_API int lua_setmetatable (lua_State *L, int objindex) { + TValue *obj; + Table *mt; + lua_lock(L); + api_checknelems(L, 1); + obj = index2value(L, objindex); + if (ttisnil(s2v(L->top.p - 1))) + mt = NULL; + else { + api_check(L, ttistable(s2v(L->top.p - 1)), "table expected"); + mt = hvalue(s2v(L->top.p - 1)); + } + switch (ttype(obj)) { + case LUA_TTABLE: { + hvalue(obj)->metatable = mt; + if (mt) { + luaC_objbarrier(L, gcvalue(obj), mt); + luaC_checkfinalizer(L, gcvalue(obj), mt); + } + break; + } + case LUA_TUSERDATA: { + uvalue(obj)->metatable = mt; + if (mt) { + luaC_objbarrier(L, uvalue(obj), mt); + luaC_checkfinalizer(L, gcvalue(obj), mt); + } + break; + } + default: { + G(L)->mt[ttype(obj)] = mt; + break; + } + } + L->top.p--; + lua_unlock(L); + return 1; +} + + +LUA_API int lua_setiuservalue (lua_State *L, int idx, int n) { + TValue *o; + int res; + lua_lock(L); + api_checknelems(L, 1); + o = index2value(L, idx); + api_check(L, ttisfulluserdata(o), "full userdata expected"); + if (!(cast_uint(n) - 1u < cast_uint(uvalue(o)->nuvalue))) + res = 0; /* 'n' not in [1, uvalue(o)->nuvalue] */ + else { + setobj(L, &uvalue(o)->uv[n - 1].uv, s2v(L->top.p - 1)); + luaC_barrierback(L, gcvalue(o), s2v(L->top.p - 1)); + res = 1; + } + L->top.p--; + lua_unlock(L); + return res; +} + + +/* +** 'load' and 'call' functions (run Lua code) +*/ + + +#define checkresults(L,na,nr) \ + api_check(L, (nr) == LUA_MULTRET \ + || (L->ci->top.p - L->top.p >= (nr) - (na)), \ + "results from function overflow current stack size") + + +LUA_API void lua_callk (lua_State *L, int nargs, int nresults, + lua_KContext ctx, lua_KFunction k) { + StkId func; + lua_lock(L); + api_check(L, k == NULL || !isLua(L->ci), + "cannot use continuations inside hooks"); + api_checknelems(L, nargs+1); + api_check(L, L->status == LUA_OK, "cannot do calls on non-normal thread"); + checkresults(L, nargs, nresults); + func = L->top.p - (nargs+1); + if (k != NULL && yieldable(L)) { /* need to prepare continuation? */ + L->ci->u.c.k = k; /* save continuation */ + L->ci->u.c.ctx = ctx; /* save context */ + luaD_call(L, func, nresults); /* do the call */ + } + else /* no continuation or no yieldable */ + luaD_callnoyield(L, func, nresults); /* just do the call */ + adjustresults(L, nresults); + lua_unlock(L); +} + + + +/* +** Execute a protected call. +*/ +struct CallS { /* data to 'f_call' */ + StkId func; + int nresults; +}; + + +static void f_call (lua_State *L, void *ud) { + struct CallS *c = cast(struct CallS *, ud); + luaD_callnoyield(L, c->func, c->nresults); +} + + + +LUA_API int lua_pcallk (lua_State *L, int nargs, int nresults, int errfunc, + lua_KContext ctx, lua_KFunction k) { + struct CallS c; + int status; + ptrdiff_t func; + lua_lock(L); + api_check(L, k == NULL || !isLua(L->ci), + "cannot use continuations inside hooks"); + api_checknelems(L, nargs+1); + api_check(L, L->status == LUA_OK, "cannot do calls on non-normal thread"); + checkresults(L, nargs, nresults); + if (errfunc == 0) + func = 0; + else { + StkId o = index2stack(L, errfunc); + api_check(L, ttisfunction(s2v(o)), "error handler must be a function"); + func = savestack(L, o); + } + c.func = L->top.p - (nargs+1); /* function to be called */ + if (k == NULL || !yieldable(L)) { /* no continuation or no yieldable? */ + c.nresults = nresults; /* do a 'conventional' protected call */ + status = luaD_pcall(L, f_call, &c, savestack(L, c.func), func); + } + else { /* prepare continuation (call is already protected by 'resume') */ + CallInfo *ci = L->ci; + ci->u.c.k = k; /* save continuation */ + ci->u.c.ctx = ctx; /* save context */ + /* save information for error recovery */ + ci->u2.funcidx = cast_int(savestack(L, c.func)); + ci->u.c.old_errfunc = L->errfunc; + L->errfunc = func; + setoah(ci->callstatus, L->allowhook); /* save value of 'allowhook' */ + ci->callstatus |= CIST_YPCALL; /* function can do error recovery */ + luaD_call(L, c.func, nresults); /* do the call */ + ci->callstatus &= ~CIST_YPCALL; + L->errfunc = ci->u.c.old_errfunc; + status = LUA_OK; /* if it is here, there were no errors */ + } + adjustresults(L, nresults); + lua_unlock(L); + return status; +} + + +LUA_API int lua_load (lua_State *L, lua_Reader reader, void *data, + const char *chunkname, const char *mode) { + ZIO z; + int status; + lua_lock(L); + if (!chunkname) chunkname = "?"; + luaZ_init(L, &z, reader, data); + status = luaD_protectedparser(L, &z, chunkname, mode); + if (status == LUA_OK) { /* no errors? */ + LClosure *f = clLvalue(s2v(L->top.p - 1)); /* get new function */ + if (f->nupvalues >= 1) { /* does it have an upvalue? */ + /* get global table from registry */ + const TValue *gt = getGtable(L); + /* set global table as 1st upvalue of 'f' (may be LUA_ENV) */ + setobj(L, f->upvals[0]->v.p, gt); + luaC_barrier(L, f->upvals[0], gt); + } + } + lua_unlock(L); + return status; +} + + +LUA_API int lua_dump (lua_State *L, lua_Writer writer, void *data, int strip) { + int status; + TValue *o; + lua_lock(L); + api_checknelems(L, 1); + o = s2v(L->top.p - 1); + if (isLfunction(o)) + status = luaU_dump(L, getproto(o), writer, data, strip); + else + status = 1; + lua_unlock(L); + return status; +} + + +LUA_API int lua_status (lua_State *L) { + return L->status; +} + + +/* +** Garbage-collection function +*/ +LUA_API int lua_gc (lua_State *L, int what, ...) { + va_list argp; + int res = 0; + global_State *g = G(L); + if (g->gcstp & GCSTPGC) /* internal stop? */ + return -1; /* all options are invalid when stopped */ + lua_lock(L); + va_start(argp, what); + switch (what) { + case LUA_GCSTOP: { + g->gcstp = GCSTPUSR; /* stopped by the user */ + break; + } + case LUA_GCRESTART: { + luaE_setdebt(g, 0); + g->gcstp = 0; /* (GCSTPGC must be already zero here) */ + break; + } + case LUA_GCCOLLECT: { + luaC_fullgc(L, 0); + break; + } + case LUA_GCCOUNT: { + /* GC values are expressed in Kbytes: #bytes/2^10 */ + res = cast_int(gettotalbytes(g) >> 10); + break; + } + case LUA_GCCOUNTB: { + res = cast_int(gettotalbytes(g) & 0x3ff); + break; + } + case LUA_GCSTEP: { + int data = va_arg(argp, int); + l_mem debt = 1; /* =1 to signal that it did an actual step */ + lu_byte oldstp = g->gcstp; + g->gcstp = 0; /* allow GC to run (GCSTPGC must be zero here) */ + if (data == 0) { + luaE_setdebt(g, 0); /* do a basic step */ + luaC_step(L); + } + else { /* add 'data' to total debt */ + debt = cast(l_mem, data) * 1024 + g->GCdebt; + luaE_setdebt(g, debt); + luaC_checkGC(L); + } + g->gcstp = oldstp; /* restore previous state */ + if (debt > 0 && g->gcstate == GCSpause) /* end of cycle? */ + res = 1; /* signal it */ + break; + } + case LUA_GCSETPAUSE: { + int data = va_arg(argp, int); + res = getgcparam(g->gcpause); + setgcparam(g->gcpause, data); + break; + } + case LUA_GCSETSTEPMUL: { + int data = va_arg(argp, int); + res = getgcparam(g->gcstepmul); + setgcparam(g->gcstepmul, data); + break; + } + case LUA_GCISRUNNING: { + res = gcrunning(g); + break; + } + case LUA_GCGEN: { + int minormul = va_arg(argp, int); + int majormul = va_arg(argp, int); + res = isdecGCmodegen(g) ? LUA_GCGEN : LUA_GCINC; + if (minormul != 0) + g->genminormul = minormul; + if (majormul != 0) + setgcparam(g->genmajormul, majormul); + luaC_changemode(L, KGC_GEN); + break; + } + case LUA_GCINC: { + int pause = va_arg(argp, int); + int stepmul = va_arg(argp, int); + int stepsize = va_arg(argp, int); + res = isdecGCmodegen(g) ? LUA_GCGEN : LUA_GCINC; + if (pause != 0) + setgcparam(g->gcpause, pause); + if (stepmul != 0) + setgcparam(g->gcstepmul, stepmul); + if (stepsize != 0) + g->gcstepsize = stepsize; + luaC_changemode(L, KGC_INC); + break; + } + default: res = -1; /* invalid option */ + } + va_end(argp); + lua_unlock(L); + return res; +} + + + +/* +** miscellaneous functions +*/ + + +LUA_API int lua_error (lua_State *L) { + TValue *errobj; + lua_lock(L); + errobj = s2v(L->top.p - 1); + api_checknelems(L, 1); + /* error object is the memory error message? */ + if (ttisshrstring(errobj) && eqshrstr(tsvalue(errobj), G(L)->memerrmsg)) + luaM_error(L); /* raise a memory error */ + else + luaG_errormsg(L); /* raise a regular error */ + /* code unreachable; will unlock when control actually leaves the kernel */ + return 0; /* to avoid warnings */ +} + + +LUA_API int lua_next (lua_State *L, int idx) { + Table *t; + int more; + lua_lock(L); + api_checknelems(L, 1); + t = gettable(L, idx); + more = luaH_next(L, t, L->top.p - 1); + if (more) { + api_incr_top(L); + } + else /* no more elements */ + L->top.p -= 1; /* remove key */ + lua_unlock(L); + return more; +} + + +LUA_API void lua_toclose (lua_State *L, int idx) { + int nresults; + StkId o; + lua_lock(L); + o = index2stack(L, idx); + nresults = L->ci->nresults; + api_check(L, L->tbclist.p < o, "given index below or equal a marked one"); + luaF_newtbcupval(L, o); /* create new to-be-closed upvalue */ + if (!hastocloseCfunc(nresults)) /* function not marked yet? */ + L->ci->nresults = codeNresults(nresults); /* mark it */ + lua_assert(hastocloseCfunc(L->ci->nresults)); + lua_unlock(L); +} + + +LUA_API void lua_concat (lua_State *L, int n) { + lua_lock(L); + api_checknelems(L, n); + if (n > 0) + luaV_concat(L, n); + else { /* nothing to concatenate */ + setsvalue2s(L, L->top.p, luaS_newlstr(L, "", 0)); /* push empty string */ + api_incr_top(L); + } + luaC_checkGC(L); + lua_unlock(L); +} + + +LUA_API void lua_len (lua_State *L, int idx) { + TValue *t; + lua_lock(L); + t = index2value(L, idx); + luaV_objlen(L, L->top.p, t); + api_incr_top(L); + lua_unlock(L); +} + + +LUA_API lua_Alloc lua_getallocf (lua_State *L, void **ud) { + lua_Alloc f; + lua_lock(L); + if (ud) *ud = G(L)->ud; + f = G(L)->frealloc; + lua_unlock(L); + return f; +} + + +LUA_API void lua_setallocf (lua_State *L, lua_Alloc f, void *ud) { + lua_lock(L); + G(L)->ud = ud; + G(L)->frealloc = f; + lua_unlock(L); +} + + +void lua_setwarnf (lua_State *L, lua_WarnFunction f, void *ud) { + lua_lock(L); + G(L)->ud_warn = ud; + G(L)->warnf = f; + lua_unlock(L); +} + + +void lua_warning (lua_State *L, const char *msg, int tocont) { + lua_lock(L); + luaE_warning(L, msg, tocont); + lua_unlock(L); +} + + + +LUA_API void *lua_newuserdatauv (lua_State *L, size_t size, int nuvalue) { + Udata *u; + lua_lock(L); + api_check(L, 0 <= nuvalue && nuvalue < USHRT_MAX, "invalid value"); + u = luaS_newudata(L, size, nuvalue); + setuvalue(L, s2v(L->top.p), u); + api_incr_top(L); + luaC_checkGC(L); + lua_unlock(L); + return getudatamem(u); +} + + + +static const char *aux_upvalue (TValue *fi, int n, TValue **val, + GCObject **owner) { + switch (ttypetag(fi)) { + case LUA_VCCL: { /* C closure */ + CClosure *f = clCvalue(fi); + if (!(cast_uint(n) - 1u < cast_uint(f->nupvalues))) + return NULL; /* 'n' not in [1, f->nupvalues] */ + *val = &f->upvalue[n-1]; + if (owner) *owner = obj2gco(f); + return ""; + } + case LUA_VLCL: { /* Lua closure */ + LClosure *f = clLvalue(fi); + TString *name; + Proto *p = f->p; + if (!(cast_uint(n) - 1u < cast_uint(p->sizeupvalues))) + return NULL; /* 'n' not in [1, p->sizeupvalues] */ + *val = f->upvals[n-1]->v.p; + if (owner) *owner = obj2gco(f->upvals[n - 1]); + name = p->upvalues[n-1].name; + return (name == NULL) ? "(no name)" : getstr(name); + } + default: return NULL; /* not a closure */ + } +} + + +LUA_API const char *lua_getupvalue (lua_State *L, int funcindex, int n) { + const char *name; + TValue *val = NULL; /* to avoid warnings */ + lua_lock(L); + name = aux_upvalue(index2value(L, funcindex), n, &val, NULL); + if (name) { + setobj2s(L, L->top.p, val); + api_incr_top(L); + } + lua_unlock(L); + return name; +} + + +LUA_API const char *lua_setupvalue (lua_State *L, int funcindex, int n) { + const char *name; + TValue *val = NULL; /* to avoid warnings */ + GCObject *owner = NULL; /* to avoid warnings */ + TValue *fi; + lua_lock(L); + fi = index2value(L, funcindex); + api_checknelems(L, 1); + name = aux_upvalue(fi, n, &val, &owner); + if (name) { + L->top.p--; + setobj(L, val, s2v(L->top.p)); + luaC_barrier(L, owner, val); + } + lua_unlock(L); + return name; +} + + +static UpVal **getupvalref (lua_State *L, int fidx, int n, LClosure **pf) { + static const UpVal *const nullup = NULL; + LClosure *f; + TValue *fi = index2value(L, fidx); + api_check(L, ttisLclosure(fi), "Lua function expected"); + f = clLvalue(fi); + if (pf) *pf = f; + if (1 <= n && n <= f->p->sizeupvalues) + return &f->upvals[n - 1]; /* get its upvalue pointer */ + else + return (UpVal**)&nullup; +} + + +LUA_API void *lua_upvalueid (lua_State *L, int fidx, int n) { + TValue *fi = index2value(L, fidx); + switch (ttypetag(fi)) { + case LUA_VLCL: { /* lua closure */ + return *getupvalref(L, fidx, n, NULL); + } + case LUA_VCCL: { /* C closure */ + CClosure *f = clCvalue(fi); + if (1 <= n && n <= f->nupvalues) + return &f->upvalue[n - 1]; + /* else */ + } /* FALLTHROUGH */ + case LUA_VLCF: + return NULL; /* light C functions have no upvalues */ + default: { + api_check(L, 0, "function expected"); + return NULL; + } + } +} + + +LUA_API void lua_upvaluejoin (lua_State *L, int fidx1, int n1, + int fidx2, int n2) { + LClosure *f1; + UpVal **up1 = getupvalref(L, fidx1, n1, &f1); + UpVal **up2 = getupvalref(L, fidx2, n2, NULL); + api_check(L, *up1 != NULL && *up2 != NULL, "invalid upvalue index"); + *up1 = *up2; + luaC_objbarrier(L, f1, *up1); +} + + diff --git a/06/lua-5.4.6/src/lapi.h b/06/lua-5.4.6/src/lapi.h new file mode 100644 index 0000000..a742427 --- /dev/null +++ b/06/lua-5.4.6/src/lapi.h @@ -0,0 +1,52 @@ +/* +** $Id: lapi.h $ +** Auxiliary functions from Lua API +** See Copyright Notice in lua.h +*/ + +#ifndef lapi_h +#define lapi_h + + +#include "llimits.h" +#include "lstate.h" + + +/* Increments 'L->top.p', checking for stack overflows */ +#define api_incr_top(L) {L->top.p++; \ + api_check(L, L->top.p <= L->ci->top.p, \ + "stack overflow");} + + +/* +** If a call returns too many multiple returns, the callee may not have +** stack space to accommodate all results. In this case, this macro +** increases its stack space ('L->ci->top.p'). +*/ +#define adjustresults(L,nres) \ + { if ((nres) <= LUA_MULTRET && L->ci->top.p < L->top.p) \ + L->ci->top.p = L->top.p; } + + +/* Ensure the stack has at least 'n' elements */ +#define api_checknelems(L,n) \ + api_check(L, (n) < (L->top.p - L->ci->func.p), \ + "not enough elements in the stack") + + +/* +** To reduce the overhead of returning from C functions, the presence of +** to-be-closed variables in these functions is coded in the CallInfo's +** field 'nresults', in a way that functions with no to-be-closed variables +** with zero, one, or "all" wanted results have no overhead. Functions +** with other number of wanted results, as well as functions with +** variables to be closed, have an extra check. +*/ + +#define hastocloseCfunc(n) ((n) < LUA_MULTRET) + +/* Map [-1, inf) (range of 'nresults') into (-inf, -2] */ +#define codeNresults(n) (-(n) - 3) +#define decodeNresults(n) (-(n) - 3) + +#endif diff --git a/06/lua-5.4.6/src/lauxlib.c b/06/lua-5.4.6/src/lauxlib.c new file mode 100644 index 0000000..4ca6c65 --- /dev/null +++ b/06/lua-5.4.6/src/lauxlib.c @@ -0,0 +1,1112 @@ +/* +** $Id: lauxlib.c $ +** Auxiliary functions for building Lua libraries +** See Copyright Notice in lua.h +*/ + +#define lauxlib_c +#define LUA_LIB + +#include "lprefix.h" + + +#include +#include +#include +#include +#include + + +/* +** This file uses only the official API of Lua. +** Any function declared here could be written as an application function. +*/ + +#include "lua.h" + +#include "lauxlib.h" + + +#if !defined(MAX_SIZET) +/* maximum value for size_t */ +#define MAX_SIZET ((size_t)(~(size_t)0)) +#endif + + +/* +** {====================================================== +** Traceback +** ======================================================= +*/ + + +#define LEVELS1 10 /* size of the first part of the stack */ +#define LEVELS2 11 /* size of the second part of the stack */ + + + +/* +** Search for 'objidx' in table at index -1. ('objidx' must be an +** absolute index.) Return 1 + string at top if it found a good name. +*/ +static int findfield (lua_State *L, int objidx, int level) { + if (level == 0 || !lua_istable(L, -1)) + return 0; /* not found */ + lua_pushnil(L); /* start 'next' loop */ + while (lua_next(L, -2)) { /* for each pair in table */ + if (lua_type(L, -2) == LUA_TSTRING) { /* ignore non-string keys */ + if (lua_rawequal(L, objidx, -1)) { /* found object? */ + lua_pop(L, 1); /* remove value (but keep name) */ + return 1; + } + else if (findfield(L, objidx, level - 1)) { /* try recursively */ + /* stack: lib_name, lib_table, field_name (top) */ + lua_pushliteral(L, "."); /* place '.' between the two names */ + lua_replace(L, -3); /* (in the slot occupied by table) */ + lua_concat(L, 3); /* lib_name.field_name */ + return 1; + } + } + lua_pop(L, 1); /* remove value */ + } + return 0; /* not found */ +} + + +/* +** Search for a name for a function in all loaded modules +*/ +static int pushglobalfuncname (lua_State *L, lua_Debug *ar) { + int top = lua_gettop(L); + lua_getinfo(L, "f", ar); /* push function */ + lua_getfield(L, LUA_REGISTRYINDEX, LUA_LOADED_TABLE); + if (findfield(L, top + 1, 2)) { + const char *name = lua_tostring(L, -1); + if (strncmp(name, LUA_GNAME ".", 3) == 0) { /* name start with '_G.'? */ + lua_pushstring(L, name + 3); /* push name without prefix */ + lua_remove(L, -2); /* remove original name */ + } + lua_copy(L, -1, top + 1); /* copy name to proper place */ + lua_settop(L, top + 1); /* remove table "loaded" and name copy */ + return 1; + } + else { + lua_settop(L, top); /* remove function and global table */ + return 0; + } +} + + +static void pushfuncname (lua_State *L, lua_Debug *ar) { + if (pushglobalfuncname(L, ar)) { /* try first a global name */ + lua_pushfstring(L, "function '%s'", lua_tostring(L, -1)); + lua_remove(L, -2); /* remove name */ + } + else if (*ar->namewhat != '\0') /* is there a name from code? */ + lua_pushfstring(L, "%s '%s'", ar->namewhat, ar->name); /* use it */ + else if (*ar->what == 'm') /* main? */ + lua_pushliteral(L, "main chunk"); + else if (*ar->what != 'C') /* for Lua functions, use */ + lua_pushfstring(L, "function <%s:%d>", ar->short_src, ar->linedefined); + else /* nothing left... */ + lua_pushliteral(L, "?"); +} + + +static int lastlevel (lua_State *L) { + lua_Debug ar; + int li = 1, le = 1; + /* find an upper bound */ + while (lua_getstack(L, le, &ar)) { li = le; le *= 2; } + /* do a binary search */ + while (li < le) { + int m = (li + le)/2; + if (lua_getstack(L, m, &ar)) li = m + 1; + else le = m; + } + return le - 1; +} + + +LUALIB_API void luaL_traceback (lua_State *L, lua_State *L1, + const char *msg, int level) { + luaL_Buffer b; + lua_Debug ar; + int last = lastlevel(L1); + int limit2show = (last - level > LEVELS1 + LEVELS2) ? LEVELS1 : -1; + luaL_buffinit(L, &b); + if (msg) { + luaL_addstring(&b, msg); + luaL_addchar(&b, '\n'); + } + luaL_addstring(&b, "stack traceback:"); + while (lua_getstack(L1, level++, &ar)) { + if (limit2show-- == 0) { /* too many levels? */ + int n = last - level - LEVELS2 + 1; /* number of levels to skip */ + lua_pushfstring(L, "\n\t...\t(skipping %d levels)", n); + luaL_addvalue(&b); /* add warning about skip */ + level += n; /* and skip to last levels */ + } + else { + lua_getinfo(L1, "Slnt", &ar); + if (ar.currentline <= 0) + lua_pushfstring(L, "\n\t%s: in ", ar.short_src); + else + lua_pushfstring(L, "\n\t%s:%d: in ", ar.short_src, ar.currentline); + luaL_addvalue(&b); + pushfuncname(L, &ar); + luaL_addvalue(&b); + if (ar.istailcall) + luaL_addstring(&b, "\n\t(...tail calls...)"); + } + } + luaL_pushresult(&b); +} + +/* }====================================================== */ + + +/* +** {====================================================== +** Error-report functions +** ======================================================= +*/ + +LUALIB_API int luaL_argerror (lua_State *L, int arg, const char *extramsg) { + lua_Debug ar; + if (!lua_getstack(L, 0, &ar)) /* no stack frame? */ + return luaL_error(L, "bad argument #%d (%s)", arg, extramsg); + lua_getinfo(L, "n", &ar); + if (strcmp(ar.namewhat, "method") == 0) { + arg--; /* do not count 'self' */ + if (arg == 0) /* error is in the self argument itself? */ + return luaL_error(L, "calling '%s' on bad self (%s)", + ar.name, extramsg); + } + if (ar.name == NULL) + ar.name = (pushglobalfuncname(L, &ar)) ? lua_tostring(L, -1) : "?"; + return luaL_error(L, "bad argument #%d to '%s' (%s)", + arg, ar.name, extramsg); +} + + +LUALIB_API int luaL_typeerror (lua_State *L, int arg, const char *tname) { + const char *msg; + const char *typearg; /* name for the type of the actual argument */ + if (luaL_getmetafield(L, arg, "__name") == LUA_TSTRING) + typearg = lua_tostring(L, -1); /* use the given type name */ + else if (lua_type(L, arg) == LUA_TLIGHTUSERDATA) + typearg = "light userdata"; /* special name for messages */ + else + typearg = luaL_typename(L, arg); /* standard name */ + msg = lua_pushfstring(L, "%s expected, got %s", tname, typearg); + return luaL_argerror(L, arg, msg); +} + + +static void tag_error (lua_State *L, int arg, int tag) { + luaL_typeerror(L, arg, lua_typename(L, tag)); +} + + +/* +** The use of 'lua_pushfstring' ensures this function does not +** need reserved stack space when called. +*/ +LUALIB_API void luaL_where (lua_State *L, int level) { + lua_Debug ar; + if (lua_getstack(L, level, &ar)) { /* check function at level */ + lua_getinfo(L, "Sl", &ar); /* get info about it */ + if (ar.currentline > 0) { /* is there info? */ + lua_pushfstring(L, "%s:%d: ", ar.short_src, ar.currentline); + return; + } + } + lua_pushfstring(L, ""); /* else, no information available... */ +} + + +/* +** Again, the use of 'lua_pushvfstring' ensures this function does +** not need reserved stack space when called. (At worst, it generates +** an error with "stack overflow" instead of the given message.) +*/ +LUALIB_API int luaL_error (lua_State *L, const char *fmt, ...) { + va_list argp; + va_start(argp, fmt); + luaL_where(L, 1); + lua_pushvfstring(L, fmt, argp); + va_end(argp); + lua_concat(L, 2); + return lua_error(L); +} + + +LUALIB_API int luaL_fileresult (lua_State *L, int stat, const char *fname) { + int en = errno; /* calls to Lua API may change this value */ + if (stat) { + lua_pushboolean(L, 1); + return 1; + } + else { + luaL_pushfail(L); + if (fname) + lua_pushfstring(L, "%s: %s", fname, strerror(en)); + else + lua_pushstring(L, strerror(en)); + lua_pushinteger(L, en); + return 3; + } +} + + +#if !defined(l_inspectstat) /* { */ + +#if defined(LUA_USE_POSIX) + +#include + +/* +** use appropriate macros to interpret 'pclose' return status +*/ +#define l_inspectstat(stat,what) \ + if (WIFEXITED(stat)) { stat = WEXITSTATUS(stat); } \ + else if (WIFSIGNALED(stat)) { stat = WTERMSIG(stat); what = "signal"; } + +#else + +#define l_inspectstat(stat,what) /* no op */ + +#endif + +#endif /* } */ + + +LUALIB_API int luaL_execresult (lua_State *L, int stat) { + if (stat != 0 && errno != 0) /* error with an 'errno'? */ + return luaL_fileresult(L, 0, NULL); + else { + const char *what = "exit"; /* type of termination */ + l_inspectstat(stat, what); /* interpret result */ + if (*what == 'e' && stat == 0) /* successful termination? */ + lua_pushboolean(L, 1); + else + luaL_pushfail(L); + lua_pushstring(L, what); + lua_pushinteger(L, stat); + return 3; /* return true/fail,what,code */ + } +} + +/* }====================================================== */ + + + +/* +** {====================================================== +** Userdata's metatable manipulation +** ======================================================= +*/ + +LUALIB_API int luaL_newmetatable (lua_State *L, const char *tname) { + if (luaL_getmetatable(L, tname) != LUA_TNIL) /* name already in use? */ + return 0; /* leave previous value on top, but return 0 */ + lua_pop(L, 1); + lua_createtable(L, 0, 2); /* create metatable */ + lua_pushstring(L, tname); + lua_setfield(L, -2, "__name"); /* metatable.__name = tname */ + lua_pushvalue(L, -1); + lua_setfield(L, LUA_REGISTRYINDEX, tname); /* registry.name = metatable */ + return 1; +} + + +LUALIB_API void luaL_setmetatable (lua_State *L, const char *tname) { + luaL_getmetatable(L, tname); + lua_setmetatable(L, -2); +} + + +LUALIB_API void *luaL_testudata (lua_State *L, int ud, const char *tname) { + void *p = lua_touserdata(L, ud); + if (p != NULL) { /* value is a userdata? */ + if (lua_getmetatable(L, ud)) { /* does it have a metatable? */ + luaL_getmetatable(L, tname); /* get correct metatable */ + if (!lua_rawequal(L, -1, -2)) /* not the same? */ + p = NULL; /* value is a userdata with wrong metatable */ + lua_pop(L, 2); /* remove both metatables */ + return p; + } + } + return NULL; /* value is not a userdata with a metatable */ +} + + +LUALIB_API void *luaL_checkudata (lua_State *L, int ud, const char *tname) { + void *p = luaL_testudata(L, ud, tname); + luaL_argexpected(L, p != NULL, ud, tname); + return p; +} + +/* }====================================================== */ + + +/* +** {====================================================== +** Argument check functions +** ======================================================= +*/ + +LUALIB_API int luaL_checkoption (lua_State *L, int arg, const char *def, + const char *const lst[]) { + const char *name = (def) ? luaL_optstring(L, arg, def) : + luaL_checkstring(L, arg); + int i; + for (i=0; lst[i]; i++) + if (strcmp(lst[i], name) == 0) + return i; + return luaL_argerror(L, arg, + lua_pushfstring(L, "invalid option '%s'", name)); +} + + +/* +** Ensures the stack has at least 'space' extra slots, raising an error +** if it cannot fulfill the request. (The error handling needs a few +** extra slots to format the error message. In case of an error without +** this extra space, Lua will generate the same 'stack overflow' error, +** but without 'msg'.) +*/ +LUALIB_API void luaL_checkstack (lua_State *L, int space, const char *msg) { + if (l_unlikely(!lua_checkstack(L, space))) { + if (msg) + luaL_error(L, "stack overflow (%s)", msg); + else + luaL_error(L, "stack overflow"); + } +} + + +LUALIB_API void luaL_checktype (lua_State *L, int arg, int t) { + if (l_unlikely(lua_type(L, arg) != t)) + tag_error(L, arg, t); +} + + +LUALIB_API void luaL_checkany (lua_State *L, int arg) { + if (l_unlikely(lua_type(L, arg) == LUA_TNONE)) + luaL_argerror(L, arg, "value expected"); +} + + +LUALIB_API const char *luaL_checklstring (lua_State *L, int arg, size_t *len) { + const char *s = lua_tolstring(L, arg, len); + if (l_unlikely(!s)) tag_error(L, arg, LUA_TSTRING); + return s; +} + + +LUALIB_API const char *luaL_optlstring (lua_State *L, int arg, + const char *def, size_t *len) { + if (lua_isnoneornil(L, arg)) { + if (len) + *len = (def ? strlen(def) : 0); + return def; + } + else return luaL_checklstring(L, arg, len); +} + + +LUALIB_API lua_Number luaL_checknumber (lua_State *L, int arg) { + int isnum; + lua_Number d = lua_tonumberx(L, arg, &isnum); + if (l_unlikely(!isnum)) + tag_error(L, arg, LUA_TNUMBER); + return d; +} + + +LUALIB_API lua_Number luaL_optnumber (lua_State *L, int arg, lua_Number def) { + return luaL_opt(L, luaL_checknumber, arg, def); +} + + +static void interror (lua_State *L, int arg) { + if (lua_isnumber(L, arg)) + luaL_argerror(L, arg, "number has no integer representation"); + else + tag_error(L, arg, LUA_TNUMBER); +} + + +LUALIB_API lua_Integer luaL_checkinteger (lua_State *L, int arg) { + int isnum; + lua_Integer d = lua_tointegerx(L, arg, &isnum); + if (l_unlikely(!isnum)) { + interror(L, arg); + } + return d; +} + + +LUALIB_API lua_Integer luaL_optinteger (lua_State *L, int arg, + lua_Integer def) { + return luaL_opt(L, luaL_checkinteger, arg, def); +} + +/* }====================================================== */ + + +/* +** {====================================================== +** Generic Buffer manipulation +** ======================================================= +*/ + +/* userdata to box arbitrary data */ +typedef struct UBox { + void *box; + size_t bsize; +} UBox; + + +static void *resizebox (lua_State *L, int idx, size_t newsize) { + void *ud; + lua_Alloc allocf = lua_getallocf(L, &ud); + UBox *box = (UBox *)lua_touserdata(L, idx); + void *temp = allocf(ud, box->box, box->bsize, newsize); + if (l_unlikely(temp == NULL && newsize > 0)) { /* allocation error? */ + lua_pushliteral(L, "not enough memory"); + lua_error(L); /* raise a memory error */ + } + box->box = temp; + box->bsize = newsize; + return temp; +} + + +static int boxgc (lua_State *L) { + resizebox(L, 1, 0); + return 0; +} + + +static const luaL_Reg boxmt[] = { /* box metamethods */ + {"__gc", boxgc}, + {"__close", boxgc}, + {NULL, NULL} +}; + + +static void newbox (lua_State *L) { + UBox *box = (UBox *)lua_newuserdatauv(L, sizeof(UBox), 0); + box->box = NULL; + box->bsize = 0; + if (luaL_newmetatable(L, "_UBOX*")) /* creating metatable? */ + luaL_setfuncs(L, boxmt, 0); /* set its metamethods */ + lua_setmetatable(L, -2); +} + + +/* +** check whether buffer is using a userdata on the stack as a temporary +** buffer +*/ +#define buffonstack(B) ((B)->b != (B)->init.b) + + +/* +** Whenever buffer is accessed, slot 'idx' must either be a box (which +** cannot be NULL) or it is a placeholder for the buffer. +*/ +#define checkbufferlevel(B,idx) \ + lua_assert(buffonstack(B) ? lua_touserdata(B->L, idx) != NULL \ + : lua_touserdata(B->L, idx) == (void*)B) + + +/* +** Compute new size for buffer 'B', enough to accommodate extra 'sz' +** bytes. (The test for "not big enough" also gets the case when the +** computation of 'newsize' overflows.) +*/ +static size_t newbuffsize (luaL_Buffer *B, size_t sz) { + size_t newsize = (B->size / 2) * 3; /* buffer size * 1.5 */ + if (l_unlikely(MAX_SIZET - sz < B->n)) /* overflow in (B->n + sz)? */ + return luaL_error(B->L, "buffer too large"); + if (newsize < B->n + sz) /* not big enough? */ + newsize = B->n + sz; + return newsize; +} + + +/* +** Returns a pointer to a free area with at least 'sz' bytes in buffer +** 'B'. 'boxidx' is the relative position in the stack where is the +** buffer's box or its placeholder. +*/ +static char *prepbuffsize (luaL_Buffer *B, size_t sz, int boxidx) { + checkbufferlevel(B, boxidx); + if (B->size - B->n >= sz) /* enough space? */ + return B->b + B->n; + else { + lua_State *L = B->L; + char *newbuff; + size_t newsize = newbuffsize(B, sz); + /* create larger buffer */ + if (buffonstack(B)) /* buffer already has a box? */ + newbuff = (char *)resizebox(L, boxidx, newsize); /* resize it */ + else { /* no box yet */ + lua_remove(L, boxidx); /* remove placeholder */ + newbox(L); /* create a new box */ + lua_insert(L, boxidx); /* move box to its intended position */ + lua_toclose(L, boxidx); + newbuff = (char *)resizebox(L, boxidx, newsize); + memcpy(newbuff, B->b, B->n * sizeof(char)); /* copy original content */ + } + B->b = newbuff; + B->size = newsize; + return newbuff + B->n; + } +} + +/* +** returns a pointer to a free area with at least 'sz' bytes +*/ +LUALIB_API char *luaL_prepbuffsize (luaL_Buffer *B, size_t sz) { + return prepbuffsize(B, sz, -1); +} + + +LUALIB_API void luaL_addlstring (luaL_Buffer *B, const char *s, size_t l) { + if (l > 0) { /* avoid 'memcpy' when 's' can be NULL */ + char *b = prepbuffsize(B, l, -1); + memcpy(b, s, l * sizeof(char)); + luaL_addsize(B, l); + } +} + + +LUALIB_API void luaL_addstring (luaL_Buffer *B, const char *s) { + luaL_addlstring(B, s, strlen(s)); +} + + +LUALIB_API void luaL_pushresult (luaL_Buffer *B) { + lua_State *L = B->L; + checkbufferlevel(B, -1); + lua_pushlstring(L, B->b, B->n); + if (buffonstack(B)) + lua_closeslot(L, -2); /* close the box */ + lua_remove(L, -2); /* remove box or placeholder from the stack */ +} + + +LUALIB_API void luaL_pushresultsize (luaL_Buffer *B, size_t sz) { + luaL_addsize(B, sz); + luaL_pushresult(B); +} + + +/* +** 'luaL_addvalue' is the only function in the Buffer system where the +** box (if existent) is not on the top of the stack. So, instead of +** calling 'luaL_addlstring', it replicates the code using -2 as the +** last argument to 'prepbuffsize', signaling that the box is (or will +** be) below the string being added to the buffer. (Box creation can +** trigger an emergency GC, so we should not remove the string from the +** stack before we have the space guaranteed.) +*/ +LUALIB_API void luaL_addvalue (luaL_Buffer *B) { + lua_State *L = B->L; + size_t len; + const char *s = lua_tolstring(L, -1, &len); + char *b = prepbuffsize(B, len, -2); + memcpy(b, s, len * sizeof(char)); + luaL_addsize(B, len); + lua_pop(L, 1); /* pop string */ +} + + +LUALIB_API void luaL_buffinit (lua_State *L, luaL_Buffer *B) { + B->L = L; + B->b = B->init.b; + B->n = 0; + B->size = LUAL_BUFFERSIZE; + lua_pushlightuserdata(L, (void*)B); /* push placeholder */ +} + + +LUALIB_API char *luaL_buffinitsize (lua_State *L, luaL_Buffer *B, size_t sz) { + luaL_buffinit(L, B); + return prepbuffsize(B, sz, -1); +} + +/* }====================================================== */ + + +/* +** {====================================================== +** Reference system +** ======================================================= +*/ + +/* index of free-list header (after the predefined values) */ +#define freelist (LUA_RIDX_LAST + 1) + +/* +** The previously freed references form a linked list: +** t[freelist] is the index of a first free index, or zero if list is +** empty; t[t[freelist]] is the index of the second element; etc. +*/ +LUALIB_API int luaL_ref (lua_State *L, int t) { + int ref; + if (lua_isnil(L, -1)) { + lua_pop(L, 1); /* remove from stack */ + return LUA_REFNIL; /* 'nil' has a unique fixed reference */ + } + t = lua_absindex(L, t); + if (lua_rawgeti(L, t, freelist) == LUA_TNIL) { /* first access? */ + ref = 0; /* list is empty */ + lua_pushinteger(L, 0); /* initialize as an empty list */ + lua_rawseti(L, t, freelist); /* ref = t[freelist] = 0 */ + } + else { /* already initialized */ + lua_assert(lua_isinteger(L, -1)); + ref = (int)lua_tointeger(L, -1); /* ref = t[freelist] */ + } + lua_pop(L, 1); /* remove element from stack */ + if (ref != 0) { /* any free element? */ + lua_rawgeti(L, t, ref); /* remove it from list */ + lua_rawseti(L, t, freelist); /* (t[freelist] = t[ref]) */ + } + else /* no free elements */ + ref = (int)lua_rawlen(L, t) + 1; /* get a new reference */ + lua_rawseti(L, t, ref); + return ref; +} + + +LUALIB_API void luaL_unref (lua_State *L, int t, int ref) { + if (ref >= 0) { + t = lua_absindex(L, t); + lua_rawgeti(L, t, freelist); + lua_assert(lua_isinteger(L, -1)); + lua_rawseti(L, t, ref); /* t[ref] = t[freelist] */ + lua_pushinteger(L, ref); + lua_rawseti(L, t, freelist); /* t[freelist] = ref */ + } +} + +/* }====================================================== */ + + +/* +** {====================================================== +** Load functions +** ======================================================= +*/ + +typedef struct LoadF { + int n; /* number of pre-read characters */ + FILE *f; /* file being read */ + char buff[BUFSIZ]; /* area for reading file */ +} LoadF; + + +static const char *getF (lua_State *L, void *ud, size_t *size) { + LoadF *lf = (LoadF *)ud; + (void)L; /* not used */ + if (lf->n > 0) { /* are there pre-read characters to be read? */ + *size = lf->n; /* return them (chars already in buffer) */ + lf->n = 0; /* no more pre-read characters */ + } + else { /* read a block from file */ + /* 'fread' can return > 0 *and* set the EOF flag. If next call to + 'getF' called 'fread', it might still wait for user input. + The next check avoids this problem. */ + if (feof(lf->f)) return NULL; + *size = fread(lf->buff, 1, sizeof(lf->buff), lf->f); /* read block */ + } + return lf->buff; +} + + +static int errfile (lua_State *L, const char *what, int fnameindex) { + const char *serr = strerror(errno); + const char *filename = lua_tostring(L, fnameindex) + 1; + lua_pushfstring(L, "cannot %s %s: %s", what, filename, serr); + lua_remove(L, fnameindex); + return LUA_ERRFILE; +} + + +/* +** Skip an optional BOM at the start of a stream. If there is an +** incomplete BOM (the first character is correct but the rest is +** not), returns the first character anyway to force an error +** (as no chunk can start with 0xEF). +*/ +static int skipBOM (FILE *f) { + int c = getc(f); /* read first character */ + if (c == 0xEF && getc(f) == 0xBB && getc(f) == 0xBF) /* correct BOM? */ + return getc(f); /* ignore BOM and return next char */ + else /* no (valid) BOM */ + return c; /* return first character */ +} + + +/* +** reads the first character of file 'f' and skips an optional BOM mark +** in its beginning plus its first line if it starts with '#'. Returns +** true if it skipped the first line. In any case, '*cp' has the +** first "valid" character of the file (after the optional BOM and +** a first-line comment). +*/ +static int skipcomment (FILE *f, int *cp) { + int c = *cp = skipBOM(f); + if (c == '#') { /* first line is a comment (Unix exec. file)? */ + do { /* skip first line */ + c = getc(f); + } while (c != EOF && c != '\n'); + *cp = getc(f); /* next character after comment, if present */ + return 1; /* there was a comment */ + } + else return 0; /* no comment */ +} + + +LUALIB_API int luaL_loadfilex (lua_State *L, const char *filename, + const char *mode) { + LoadF lf; + int status, readstatus; + int c; + int fnameindex = lua_gettop(L) + 1; /* index of filename on the stack */ + if (filename == NULL) { + lua_pushliteral(L, "=stdin"); + lf.f = stdin; + } + else { + lua_pushfstring(L, "@%s", filename); + lf.f = fopen(filename, "r"); + if (lf.f == NULL) return errfile(L, "open", fnameindex); + } + lf.n = 0; + if (skipcomment(lf.f, &c)) /* read initial portion */ + lf.buff[lf.n++] = '\n'; /* add newline to correct line numbers */ + if (c == LUA_SIGNATURE[0]) { /* binary file? */ + lf.n = 0; /* remove possible newline */ + if (filename) { /* "real" file? */ + lf.f = freopen(filename, "rb", lf.f); /* reopen in binary mode */ + if (lf.f == NULL) return errfile(L, "reopen", fnameindex); + skipcomment(lf.f, &c); /* re-read initial portion */ + } + } + if (c != EOF) + lf.buff[lf.n++] = c; /* 'c' is the first character of the stream */ + status = lua_load(L, getF, &lf, lua_tostring(L, -1), mode); + readstatus = ferror(lf.f); + if (filename) fclose(lf.f); /* close file (even in case of errors) */ + if (readstatus) { + lua_settop(L, fnameindex); /* ignore results from 'lua_load' */ + return errfile(L, "read", fnameindex); + } + lua_remove(L, fnameindex); + return status; +} + + +typedef struct LoadS { + const char *s; + size_t size; +} LoadS; + + +static const char *getS (lua_State *L, void *ud, size_t *size) { + LoadS *ls = (LoadS *)ud; + (void)L; /* not used */ + if (ls->size == 0) return NULL; + *size = ls->size; + ls->size = 0; + return ls->s; +} + + +LUALIB_API int luaL_loadbufferx (lua_State *L, const char *buff, size_t size, + const char *name, const char *mode) { + LoadS ls; + ls.s = buff; + ls.size = size; + return lua_load(L, getS, &ls, name, mode); +} + + +LUALIB_API int luaL_loadstring (lua_State *L, const char *s) { + return luaL_loadbuffer(L, s, strlen(s), s); +} + +/* }====================================================== */ + + + +LUALIB_API int luaL_getmetafield (lua_State *L, int obj, const char *event) { + if (!lua_getmetatable(L, obj)) /* no metatable? */ + return LUA_TNIL; + else { + int tt; + lua_pushstring(L, event); + tt = lua_rawget(L, -2); + if (tt == LUA_TNIL) /* is metafield nil? */ + lua_pop(L, 2); /* remove metatable and metafield */ + else + lua_remove(L, -2); /* remove only metatable */ + return tt; /* return metafield type */ + } +} + + +LUALIB_API int luaL_callmeta (lua_State *L, int obj, const char *event) { + obj = lua_absindex(L, obj); + if (luaL_getmetafield(L, obj, event) == LUA_TNIL) /* no metafield? */ + return 0; + lua_pushvalue(L, obj); + lua_call(L, 1, 1); + return 1; +} + + +LUALIB_API lua_Integer luaL_len (lua_State *L, int idx) { + lua_Integer l; + int isnum; + lua_len(L, idx); + l = lua_tointegerx(L, -1, &isnum); + if (l_unlikely(!isnum)) + luaL_error(L, "object length is not an integer"); + lua_pop(L, 1); /* remove object */ + return l; +} + + +LUALIB_API const char *luaL_tolstring (lua_State *L, int idx, size_t *len) { + idx = lua_absindex(L,idx); + if (luaL_callmeta(L, idx, "__tostring")) { /* metafield? */ + if (!lua_isstring(L, -1)) + luaL_error(L, "'__tostring' must return a string"); + } + else { + switch (lua_type(L, idx)) { + case LUA_TNUMBER: { + if (lua_isinteger(L, idx)) + lua_pushfstring(L, "%I", (LUAI_UACINT)lua_tointeger(L, idx)); + else + lua_pushfstring(L, "%f", (LUAI_UACNUMBER)lua_tonumber(L, idx)); + break; + } + case LUA_TSTRING: + lua_pushvalue(L, idx); + break; + case LUA_TBOOLEAN: + lua_pushstring(L, (lua_toboolean(L, idx) ? "true" : "false")); + break; + case LUA_TNIL: + lua_pushliteral(L, "nil"); + break; + default: { + int tt = luaL_getmetafield(L, idx, "__name"); /* try name */ + const char *kind = (tt == LUA_TSTRING) ? lua_tostring(L, -1) : + luaL_typename(L, idx); + lua_pushfstring(L, "%s: %p", kind, lua_topointer(L, idx)); + if (tt != LUA_TNIL) + lua_remove(L, -2); /* remove '__name' */ + break; + } + } + } + return lua_tolstring(L, -1, len); +} + + +/* +** set functions from list 'l' into table at top - 'nup'; each +** function gets the 'nup' elements at the top as upvalues. +** Returns with only the table at the stack. +*/ +LUALIB_API void luaL_setfuncs (lua_State *L, const luaL_Reg *l, int nup) { + luaL_checkstack(L, nup, "too many upvalues"); + for (; l->name != NULL; l++) { /* fill the table with given functions */ + if (l->func == NULL) /* place holder? */ + lua_pushboolean(L, 0); + else { + int i; + for (i = 0; i < nup; i++) /* copy upvalues to the top */ + lua_pushvalue(L, -nup); + lua_pushcclosure(L, l->func, nup); /* closure with those upvalues */ + } + lua_setfield(L, -(nup + 2), l->name); + } + lua_pop(L, nup); /* remove upvalues */ +} + + +/* +** ensure that stack[idx][fname] has a table and push that table +** into the stack +*/ +LUALIB_API int luaL_getsubtable (lua_State *L, int idx, const char *fname) { + if (lua_getfield(L, idx, fname) == LUA_TTABLE) + return 1; /* table already there */ + else { + lua_pop(L, 1); /* remove previous result */ + idx = lua_absindex(L, idx); + lua_newtable(L); + lua_pushvalue(L, -1); /* copy to be left at top */ + lua_setfield(L, idx, fname); /* assign new table to field */ + return 0; /* false, because did not find table there */ + } +} + + +/* +** Stripped-down 'require': After checking "loaded" table, calls 'openf' +** to open a module, registers the result in 'package.loaded' table and, +** if 'glb' is true, also registers the result in the global table. +** Leaves resulting module on the top. +*/ +LUALIB_API void luaL_requiref (lua_State *L, const char *modname, + lua_CFunction openf, int glb) { + luaL_getsubtable(L, LUA_REGISTRYINDEX, LUA_LOADED_TABLE); + lua_getfield(L, -1, modname); /* LOADED[modname] */ + if (!lua_toboolean(L, -1)) { /* package not already loaded? */ + lua_pop(L, 1); /* remove field */ + lua_pushcfunction(L, openf); + lua_pushstring(L, modname); /* argument to open function */ + lua_call(L, 1, 1); /* call 'openf' to open module */ + lua_pushvalue(L, -1); /* make copy of module (call result) */ + lua_setfield(L, -3, modname); /* LOADED[modname] = module */ + } + lua_remove(L, -2); /* remove LOADED table */ + if (glb) { + lua_pushvalue(L, -1); /* copy of module */ + lua_setglobal(L, modname); /* _G[modname] = module */ + } +} + + +LUALIB_API void luaL_addgsub (luaL_Buffer *b, const char *s, + const char *p, const char *r) { + const char *wild; + size_t l = strlen(p); + while ((wild = strstr(s, p)) != NULL) { + luaL_addlstring(b, s, wild - s); /* push prefix */ + luaL_addstring(b, r); /* push replacement in place of pattern */ + s = wild + l; /* continue after 'p' */ + } + luaL_addstring(b, s); /* push last suffix */ +} + + +LUALIB_API const char *luaL_gsub (lua_State *L, const char *s, + const char *p, const char *r) { + luaL_Buffer b; + luaL_buffinit(L, &b); + luaL_addgsub(&b, s, p, r); + luaL_pushresult(&b); + return lua_tostring(L, -1); +} + + +static void *l_alloc (void *ud, void *ptr, size_t osize, size_t nsize) { + (void)ud; (void)osize; /* not used */ + if (nsize == 0) { + free(ptr); + return NULL; + } + else + return realloc(ptr, nsize); +} + + +static int panic (lua_State *L) { + const char *msg = lua_tostring(L, -1); + if (msg == NULL) msg = "error object is not a string"; + lua_writestringerror("PANIC: unprotected error in call to Lua API (%s)\n", + msg); + return 0; /* return to Lua to abort */ +} + + +/* +** Warning functions: +** warnfoff: warning system is off +** warnfon: ready to start a new message +** warnfcont: previous message is to be continued +*/ +static void warnfoff (void *ud, const char *message, int tocont); +static void warnfon (void *ud, const char *message, int tocont); +static void warnfcont (void *ud, const char *message, int tocont); + + +/* +** Check whether message is a control message. If so, execute the +** control or ignore it if unknown. +*/ +static int checkcontrol (lua_State *L, const char *message, int tocont) { + if (tocont || *(message++) != '@') /* not a control message? */ + return 0; + else { + if (strcmp(message, "off") == 0) + lua_setwarnf(L, warnfoff, L); /* turn warnings off */ + else if (strcmp(message, "on") == 0) + lua_setwarnf(L, warnfon, L); /* turn warnings on */ + return 1; /* it was a control message */ + } +} + + +static void warnfoff (void *ud, const char *message, int tocont) { + checkcontrol((lua_State *)ud, message, tocont); +} + + +/* +** Writes the message and handle 'tocont', finishing the message +** if needed and setting the next warn function. +*/ +static void warnfcont (void *ud, const char *message, int tocont) { + lua_State *L = (lua_State *)ud; + lua_writestringerror("%s", message); /* write message */ + if (tocont) /* not the last part? */ + lua_setwarnf(L, warnfcont, L); /* to be continued */ + else { /* last part */ + lua_writestringerror("%s", "\n"); /* finish message with end-of-line */ + lua_setwarnf(L, warnfon, L); /* next call is a new message */ + } +} + + +static void warnfon (void *ud, const char *message, int tocont) { + if (checkcontrol((lua_State *)ud, message, tocont)) /* control message? */ + return; /* nothing else to be done */ + lua_writestringerror("%s", "Lua warning: "); /* start a new warning */ + warnfcont(ud, message, tocont); /* finish processing */ +} + + +LUALIB_API lua_State *luaL_newstate (void) { + lua_State *L = lua_newstate(l_alloc, NULL); + if (l_likely(L)) { + lua_atpanic(L, &panic); + lua_setwarnf(L, warnfoff, L); /* default is warnings off */ + } + return L; +} + + +LUALIB_API void luaL_checkversion_ (lua_State *L, lua_Number ver, size_t sz) { + lua_Number v = lua_version(L); + if (sz != LUAL_NUMSIZES) /* check numeric types */ + luaL_error(L, "core and library have incompatible numeric types"); + else if (v != ver) + luaL_error(L, "version mismatch: app. needs %f, Lua core provides %f", + (LUAI_UACNUMBER)ver, (LUAI_UACNUMBER)v); +} + diff --git a/06/lua-5.4.6/src/lauxlib.h b/06/lua-5.4.6/src/lauxlib.h new file mode 100644 index 0000000..5b977e2 --- /dev/null +++ b/06/lua-5.4.6/src/lauxlib.h @@ -0,0 +1,301 @@ +/* +** $Id: lauxlib.h $ +** Auxiliary functions for building Lua libraries +** See Copyright Notice in lua.h +*/ + + +#ifndef lauxlib_h +#define lauxlib_h + + +#include +#include + +#include "luaconf.h" +#include "lua.h" + + +/* global table */ +#define LUA_GNAME "_G" + + +typedef struct luaL_Buffer luaL_Buffer; + + +/* extra error code for 'luaL_loadfilex' */ +#define LUA_ERRFILE (LUA_ERRERR+1) + + +/* key, in the registry, for table of loaded modules */ +#define LUA_LOADED_TABLE "_LOADED" + + +/* key, in the registry, for table of preloaded loaders */ +#define LUA_PRELOAD_TABLE "_PRELOAD" + + +typedef struct luaL_Reg { + const char *name; + lua_CFunction func; +} luaL_Reg; + + +#define LUAL_NUMSIZES (sizeof(lua_Integer)*16 + sizeof(lua_Number)) + +LUALIB_API void (luaL_checkversion_) (lua_State *L, lua_Number ver, size_t sz); +#define luaL_checkversion(L) \ + luaL_checkversion_(L, LUA_VERSION_NUM, LUAL_NUMSIZES) + +LUALIB_API int (luaL_getmetafield) (lua_State *L, int obj, const char *e); +LUALIB_API int (luaL_callmeta) (lua_State *L, int obj, const char *e); +LUALIB_API const char *(luaL_tolstring) (lua_State *L, int idx, size_t *len); +LUALIB_API int (luaL_argerror) (lua_State *L, int arg, const char *extramsg); +LUALIB_API int (luaL_typeerror) (lua_State *L, int arg, const char *tname); +LUALIB_API const char *(luaL_checklstring) (lua_State *L, int arg, + size_t *l); +LUALIB_API const char *(luaL_optlstring) (lua_State *L, int arg, + const char *def, size_t *l); +LUALIB_API lua_Number (luaL_checknumber) (lua_State *L, int arg); +LUALIB_API lua_Number (luaL_optnumber) (lua_State *L, int arg, lua_Number def); + +LUALIB_API lua_Integer (luaL_checkinteger) (lua_State *L, int arg); +LUALIB_API lua_Integer (luaL_optinteger) (lua_State *L, int arg, + lua_Integer def); + +LUALIB_API void (luaL_checkstack) (lua_State *L, int sz, const char *msg); +LUALIB_API void (luaL_checktype) (lua_State *L, int arg, int t); +LUALIB_API void (luaL_checkany) (lua_State *L, int arg); + +LUALIB_API int (luaL_newmetatable) (lua_State *L, const char *tname); +LUALIB_API void (luaL_setmetatable) (lua_State *L, const char *tname); +LUALIB_API void *(luaL_testudata) (lua_State *L, int ud, const char *tname); +LUALIB_API void *(luaL_checkudata) (lua_State *L, int ud, const char *tname); + +LUALIB_API void (luaL_where) (lua_State *L, int lvl); +LUALIB_API int (luaL_error) (lua_State *L, const char *fmt, ...); + +LUALIB_API int (luaL_checkoption) (lua_State *L, int arg, const char *def, + const char *const lst[]); + +LUALIB_API int (luaL_fileresult) (lua_State *L, int stat, const char *fname); +LUALIB_API int (luaL_execresult) (lua_State *L, int stat); + + +/* predefined references */ +#define LUA_NOREF (-2) +#define LUA_REFNIL (-1) + +LUALIB_API int (luaL_ref) (lua_State *L, int t); +LUALIB_API void (luaL_unref) (lua_State *L, int t, int ref); + +LUALIB_API int (luaL_loadfilex) (lua_State *L, const char *filename, + const char *mode); + +#define luaL_loadfile(L,f) luaL_loadfilex(L,f,NULL) + +LUALIB_API int (luaL_loadbufferx) (lua_State *L, const char *buff, size_t sz, + const char *name, const char *mode); +LUALIB_API int (luaL_loadstring) (lua_State *L, const char *s); + +LUALIB_API lua_State *(luaL_newstate) (void); + +LUALIB_API lua_Integer (luaL_len) (lua_State *L, int idx); + +LUALIB_API void (luaL_addgsub) (luaL_Buffer *b, const char *s, + const char *p, const char *r); +LUALIB_API const char *(luaL_gsub) (lua_State *L, const char *s, + const char *p, const char *r); + +LUALIB_API void (luaL_setfuncs) (lua_State *L, const luaL_Reg *l, int nup); + +LUALIB_API int (luaL_getsubtable) (lua_State *L, int idx, const char *fname); + +LUALIB_API void (luaL_traceback) (lua_State *L, lua_State *L1, + const char *msg, int level); + +LUALIB_API void (luaL_requiref) (lua_State *L, const char *modname, + lua_CFunction openf, int glb); + +/* +** =============================================================== +** some useful macros +** =============================================================== +*/ + + +#define luaL_newlibtable(L,l) \ + lua_createtable(L, 0, sizeof(l)/sizeof((l)[0]) - 1) + +#define luaL_newlib(L,l) \ + (luaL_checkversion(L), luaL_newlibtable(L,l), luaL_setfuncs(L,l,0)) + +#define luaL_argcheck(L, cond,arg,extramsg) \ + ((void)(luai_likely(cond) || luaL_argerror(L, (arg), (extramsg)))) + +#define luaL_argexpected(L,cond,arg,tname) \ + ((void)(luai_likely(cond) || luaL_typeerror(L, (arg), (tname)))) + +#define luaL_checkstring(L,n) (luaL_checklstring(L, (n), NULL)) +#define luaL_optstring(L,n,d) (luaL_optlstring(L, (n), (d), NULL)) + +#define luaL_typename(L,i) lua_typename(L, lua_type(L,(i))) + +#define luaL_dofile(L, fn) \ + (luaL_loadfile(L, fn) || lua_pcall(L, 0, LUA_MULTRET, 0)) + +#define luaL_dostring(L, s) \ + (luaL_loadstring(L, s) || lua_pcall(L, 0, LUA_MULTRET, 0)) + +#define luaL_getmetatable(L,n) (lua_getfield(L, LUA_REGISTRYINDEX, (n))) + +#define luaL_opt(L,f,n,d) (lua_isnoneornil(L,(n)) ? (d) : f(L,(n))) + +#define luaL_loadbuffer(L,s,sz,n) luaL_loadbufferx(L,s,sz,n,NULL) + + +/* +** Perform arithmetic operations on lua_Integer values with wrap-around +** semantics, as the Lua core does. +*/ +#define luaL_intop(op,v1,v2) \ + ((lua_Integer)((lua_Unsigned)(v1) op (lua_Unsigned)(v2))) + + +/* push the value used to represent failure/error */ +#define luaL_pushfail(L) lua_pushnil(L) + + +/* +** Internal assertions for in-house debugging +*/ +#if !defined(lua_assert) + +#if defined LUAI_ASSERT + #include + #define lua_assert(c) assert(c) +#else + #define lua_assert(c) ((void)0) +#endif + +#endif + + + +/* +** {====================================================== +** Generic Buffer manipulation +** ======================================================= +*/ + +struct luaL_Buffer { + char *b; /* buffer address */ + size_t size; /* buffer size */ + size_t n; /* number of characters in buffer */ + lua_State *L; + union { + LUAI_MAXALIGN; /* ensure maximum alignment for buffer */ + char b[LUAL_BUFFERSIZE]; /* initial buffer */ + } init; +}; + + +#define luaL_bufflen(bf) ((bf)->n) +#define luaL_buffaddr(bf) ((bf)->b) + + +#define luaL_addchar(B,c) \ + ((void)((B)->n < (B)->size || luaL_prepbuffsize((B), 1)), \ + ((B)->b[(B)->n++] = (c))) + +#define luaL_addsize(B,s) ((B)->n += (s)) + +#define luaL_buffsub(B,s) ((B)->n -= (s)) + +LUALIB_API void (luaL_buffinit) (lua_State *L, luaL_Buffer *B); +LUALIB_API char *(luaL_prepbuffsize) (luaL_Buffer *B, size_t sz); +LUALIB_API void (luaL_addlstring) (luaL_Buffer *B, const char *s, size_t l); +LUALIB_API void (luaL_addstring) (luaL_Buffer *B, const char *s); +LUALIB_API void (luaL_addvalue) (luaL_Buffer *B); +LUALIB_API void (luaL_pushresult) (luaL_Buffer *B); +LUALIB_API void (luaL_pushresultsize) (luaL_Buffer *B, size_t sz); +LUALIB_API char *(luaL_buffinitsize) (lua_State *L, luaL_Buffer *B, size_t sz); + +#define luaL_prepbuffer(B) luaL_prepbuffsize(B, LUAL_BUFFERSIZE) + +/* }====================================================== */ + + + +/* +** {====================================================== +** File handles for IO library +** ======================================================= +*/ + +/* +** A file handle is a userdata with metatable 'LUA_FILEHANDLE' and +** initial structure 'luaL_Stream' (it may contain other fields +** after that initial structure). +*/ + +#define LUA_FILEHANDLE "FILE*" + + +typedef struct luaL_Stream { + FILE *f; /* stream (NULL for incompletely created streams) */ + lua_CFunction closef; /* to close stream (NULL for closed streams) */ +} luaL_Stream; + +/* }====================================================== */ + +/* +** {================================================================== +** "Abstraction Layer" for basic report of messages and errors +** =================================================================== +*/ + +/* print a string */ +#if !defined(lua_writestring) +#define lua_writestring(s,l) fwrite((s), sizeof(char), (l), stdout) +#endif + +/* print a newline and flush the output */ +#if !defined(lua_writeline) +#define lua_writeline() (lua_writestring("\n", 1), fflush(stdout)) +#endif + +/* print an error message */ +#if !defined(lua_writestringerror) +#define lua_writestringerror(s,p) \ + (fprintf(stderr, (s), (p)), fflush(stderr)) +#endif + +/* }================================================================== */ + + +/* +** {============================================================ +** Compatibility with deprecated conversions +** ============================================================= +*/ +#if defined(LUA_COMPAT_APIINTCASTS) + +#define luaL_checkunsigned(L,a) ((lua_Unsigned)luaL_checkinteger(L,a)) +#define luaL_optunsigned(L,a,d) \ + ((lua_Unsigned)luaL_optinteger(L,a,(lua_Integer)(d))) + +#define luaL_checkint(L,n) ((int)luaL_checkinteger(L, (n))) +#define luaL_optint(L,n,d) ((int)luaL_optinteger(L, (n), (d))) + +#define luaL_checklong(L,n) ((long)luaL_checkinteger(L, (n))) +#define luaL_optlong(L,n,d) ((long)luaL_optinteger(L, (n), (d))) + +#endif +/* }============================================================ */ + + + +#endif + + diff --git a/06/lua-5.4.6/src/lbaselib.c b/06/lua-5.4.6/src/lbaselib.c new file mode 100644 index 0000000..1d60c9d --- /dev/null +++ b/06/lua-5.4.6/src/lbaselib.c @@ -0,0 +1,549 @@ +/* +** $Id: lbaselib.c $ +** Basic library +** See Copyright Notice in lua.h +*/ + +#define lbaselib_c +#define LUA_LIB + +#include "lprefix.h" + + +#include +#include +#include +#include + +#include "lua.h" + +#include "lauxlib.h" +#include "lualib.h" + + +static int luaB_print (lua_State *L) { + int n = lua_gettop(L); /* number of arguments */ + int i; + for (i = 1; i <= n; i++) { /* for each argument */ + size_t l; + const char *s = luaL_tolstring(L, i, &l); /* convert it to string */ + if (i > 1) /* not the first element? */ + lua_writestring("\t", 1); /* add a tab before it */ + lua_writestring(s, l); /* print it */ + lua_pop(L, 1); /* pop result */ + } + lua_writeline(); + return 0; +} + + +/* +** Creates a warning with all given arguments. +** Check first for errors; otherwise an error may interrupt +** the composition of a warning, leaving it unfinished. +*/ +static int luaB_warn (lua_State *L) { + int n = lua_gettop(L); /* number of arguments */ + int i; + luaL_checkstring(L, 1); /* at least one argument */ + for (i = 2; i <= n; i++) + luaL_checkstring(L, i); /* make sure all arguments are strings */ + for (i = 1; i < n; i++) /* compose warning */ + lua_warning(L, lua_tostring(L, i), 1); + lua_warning(L, lua_tostring(L, n), 0); /* close warning */ + return 0; +} + + +#define SPACECHARS " \f\n\r\t\v" + +static const char *b_str2int (const char *s, int base, lua_Integer *pn) { + lua_Unsigned n = 0; + int neg = 0; + s += strspn(s, SPACECHARS); /* skip initial spaces */ + if (*s == '-') { s++; neg = 1; } /* handle sign */ + else if (*s == '+') s++; + if (!isalnum((unsigned char)*s)) /* no digit? */ + return NULL; + do { + int digit = (isdigit((unsigned char)*s)) ? *s - '0' + : (toupper((unsigned char)*s) - 'A') + 10; + if (digit >= base) return NULL; /* invalid numeral */ + n = n * base + digit; + s++; + } while (isalnum((unsigned char)*s)); + s += strspn(s, SPACECHARS); /* skip trailing spaces */ + *pn = (lua_Integer)((neg) ? (0u - n) : n); + return s; +} + + +static int luaB_tonumber (lua_State *L) { + if (lua_isnoneornil(L, 2)) { /* standard conversion? */ + if (lua_type(L, 1) == LUA_TNUMBER) { /* already a number? */ + lua_settop(L, 1); /* yes; return it */ + return 1; + } + else { + size_t l; + const char *s = lua_tolstring(L, 1, &l); + if (s != NULL && lua_stringtonumber(L, s) == l + 1) + return 1; /* successful conversion to number */ + /* else not a number */ + luaL_checkany(L, 1); /* (but there must be some parameter) */ + } + } + else { + size_t l; + const char *s; + lua_Integer n = 0; /* to avoid warnings */ + lua_Integer base = luaL_checkinteger(L, 2); + luaL_checktype(L, 1, LUA_TSTRING); /* no numbers as strings */ + s = lua_tolstring(L, 1, &l); + luaL_argcheck(L, 2 <= base && base <= 36, 2, "base out of range"); + if (b_str2int(s, (int)base, &n) == s + l) { + lua_pushinteger(L, n); + return 1; + } /* else not a number */ + } /* else not a number */ + luaL_pushfail(L); /* not a number */ + return 1; +} + + +static int luaB_error (lua_State *L) { + int level = (int)luaL_optinteger(L, 2, 1); + lua_settop(L, 1); + if (lua_type(L, 1) == LUA_TSTRING && level > 0) { + luaL_where(L, level); /* add extra information */ + lua_pushvalue(L, 1); + lua_concat(L, 2); + } + return lua_error(L); +} + + +static int luaB_getmetatable (lua_State *L) { + luaL_checkany(L, 1); + if (!lua_getmetatable(L, 1)) { + lua_pushnil(L); + return 1; /* no metatable */ + } + luaL_getmetafield(L, 1, "__metatable"); + return 1; /* returns either __metatable field (if present) or metatable */ +} + + +static int luaB_setmetatable (lua_State *L) { + int t = lua_type(L, 2); + luaL_checktype(L, 1, LUA_TTABLE); + luaL_argexpected(L, t == LUA_TNIL || t == LUA_TTABLE, 2, "nil or table"); + if (l_unlikely(luaL_getmetafield(L, 1, "__metatable") != LUA_TNIL)) + return luaL_error(L, "cannot change a protected metatable"); + lua_settop(L, 2); + lua_setmetatable(L, 1); + return 1; +} + + +static int luaB_rawequal (lua_State *L) { + luaL_checkany(L, 1); + luaL_checkany(L, 2); + lua_pushboolean(L, lua_rawequal(L, 1, 2)); + return 1; +} + + +static int luaB_rawlen (lua_State *L) { + int t = lua_type(L, 1); + luaL_argexpected(L, t == LUA_TTABLE || t == LUA_TSTRING, 1, + "table or string"); + lua_pushinteger(L, lua_rawlen(L, 1)); + return 1; +} + + +static int luaB_rawget (lua_State *L) { + luaL_checktype(L, 1, LUA_TTABLE); + luaL_checkany(L, 2); + lua_settop(L, 2); + lua_rawget(L, 1); + return 1; +} + +static int luaB_rawset (lua_State *L) { + luaL_checktype(L, 1, LUA_TTABLE); + luaL_checkany(L, 2); + luaL_checkany(L, 3); + lua_settop(L, 3); + lua_rawset(L, 1); + return 1; +} + + +static int pushmode (lua_State *L, int oldmode) { + if (oldmode == -1) + luaL_pushfail(L); /* invalid call to 'lua_gc' */ + else + lua_pushstring(L, (oldmode == LUA_GCINC) ? "incremental" + : "generational"); + return 1; +} + + +/* +** check whether call to 'lua_gc' was valid (not inside a finalizer) +*/ +#define checkvalres(res) { if (res == -1) break; } + +static int luaB_collectgarbage (lua_State *L) { + static const char *const opts[] = {"stop", "restart", "collect", + "count", "step", "setpause", "setstepmul", + "isrunning", "generational", "incremental", NULL}; + static const int optsnum[] = {LUA_GCSTOP, LUA_GCRESTART, LUA_GCCOLLECT, + LUA_GCCOUNT, LUA_GCSTEP, LUA_GCSETPAUSE, LUA_GCSETSTEPMUL, + LUA_GCISRUNNING, LUA_GCGEN, LUA_GCINC}; + int o = optsnum[luaL_checkoption(L, 1, "collect", opts)]; + switch (o) { + case LUA_GCCOUNT: { + int k = lua_gc(L, o); + int b = lua_gc(L, LUA_GCCOUNTB); + checkvalres(k); + lua_pushnumber(L, (lua_Number)k + ((lua_Number)b/1024)); + return 1; + } + case LUA_GCSTEP: { + int step = (int)luaL_optinteger(L, 2, 0); + int res = lua_gc(L, o, step); + checkvalres(res); + lua_pushboolean(L, res); + return 1; + } + case LUA_GCSETPAUSE: + case LUA_GCSETSTEPMUL: { + int p = (int)luaL_optinteger(L, 2, 0); + int previous = lua_gc(L, o, p); + checkvalres(previous); + lua_pushinteger(L, previous); + return 1; + } + case LUA_GCISRUNNING: { + int res = lua_gc(L, o); + checkvalres(res); + lua_pushboolean(L, res); + return 1; + } + case LUA_GCGEN: { + int minormul = (int)luaL_optinteger(L, 2, 0); + int majormul = (int)luaL_optinteger(L, 3, 0); + return pushmode(L, lua_gc(L, o, minormul, majormul)); + } + case LUA_GCINC: { + int pause = (int)luaL_optinteger(L, 2, 0); + int stepmul = (int)luaL_optinteger(L, 3, 0); + int stepsize = (int)luaL_optinteger(L, 4, 0); + return pushmode(L, lua_gc(L, o, pause, stepmul, stepsize)); + } + default: { + int res = lua_gc(L, o); + checkvalres(res); + lua_pushinteger(L, res); + return 1; + } + } + luaL_pushfail(L); /* invalid call (inside a finalizer) */ + return 1; +} + + +static int luaB_type (lua_State *L) { + int t = lua_type(L, 1); + luaL_argcheck(L, t != LUA_TNONE, 1, "value expected"); + lua_pushstring(L, lua_typename(L, t)); + return 1; +} + + +static int luaB_next (lua_State *L) { + luaL_checktype(L, 1, LUA_TTABLE); + lua_settop(L, 2); /* create a 2nd argument if there isn't one */ + if (lua_next(L, 1)) + return 2; + else { + lua_pushnil(L); + return 1; + } +} + + +static int pairscont (lua_State *L, int status, lua_KContext k) { + (void)L; (void)status; (void)k; /* unused */ + return 3; +} + +static int luaB_pairs (lua_State *L) { + luaL_checkany(L, 1); + if (luaL_getmetafield(L, 1, "__pairs") == LUA_TNIL) { /* no metamethod? */ + lua_pushcfunction(L, luaB_next); /* will return generator, */ + lua_pushvalue(L, 1); /* state, */ + lua_pushnil(L); /* and initial value */ + } + else { + lua_pushvalue(L, 1); /* argument 'self' to metamethod */ + lua_callk(L, 1, 3, 0, pairscont); /* get 3 values from metamethod */ + } + return 3; +} + + +/* +** Traversal function for 'ipairs' +*/ +static int ipairsaux (lua_State *L) { + lua_Integer i = luaL_checkinteger(L, 2); + i = luaL_intop(+, i, 1); + lua_pushinteger(L, i); + return (lua_geti(L, 1, i) == LUA_TNIL) ? 1 : 2; +} + + +/* +** 'ipairs' function. Returns 'ipairsaux', given "table", 0. +** (The given "table" may not be a table.) +*/ +static int luaB_ipairs (lua_State *L) { + luaL_checkany(L, 1); + lua_pushcfunction(L, ipairsaux); /* iteration function */ + lua_pushvalue(L, 1); /* state */ + lua_pushinteger(L, 0); /* initial value */ + return 3; +} + + +static int load_aux (lua_State *L, int status, int envidx) { + if (l_likely(status == LUA_OK)) { + if (envidx != 0) { /* 'env' parameter? */ + lua_pushvalue(L, envidx); /* environment for loaded function */ + if (!lua_setupvalue(L, -2, 1)) /* set it as 1st upvalue */ + lua_pop(L, 1); /* remove 'env' if not used by previous call */ + } + return 1; + } + else { /* error (message is on top of the stack) */ + luaL_pushfail(L); + lua_insert(L, -2); /* put before error message */ + return 2; /* return fail plus error message */ + } +} + + +static int luaB_loadfile (lua_State *L) { + const char *fname = luaL_optstring(L, 1, NULL); + const char *mode = luaL_optstring(L, 2, NULL); + int env = (!lua_isnone(L, 3) ? 3 : 0); /* 'env' index or 0 if no 'env' */ + int status = luaL_loadfilex(L, fname, mode); + return load_aux(L, status, env); +} + + +/* +** {====================================================== +** Generic Read function +** ======================================================= +*/ + + +/* +** reserved slot, above all arguments, to hold a copy of the returned +** string to avoid it being collected while parsed. 'load' has four +** optional arguments (chunk, source name, mode, and environment). +*/ +#define RESERVEDSLOT 5 + + +/* +** Reader for generic 'load' function: 'lua_load' uses the +** stack for internal stuff, so the reader cannot change the +** stack top. Instead, it keeps its resulting string in a +** reserved slot inside the stack. +*/ +static const char *generic_reader (lua_State *L, void *ud, size_t *size) { + (void)(ud); /* not used */ + luaL_checkstack(L, 2, "too many nested functions"); + lua_pushvalue(L, 1); /* get function */ + lua_call(L, 0, 1); /* call it */ + if (lua_isnil(L, -1)) { + lua_pop(L, 1); /* pop result */ + *size = 0; + return NULL; + } + else if (l_unlikely(!lua_isstring(L, -1))) + luaL_error(L, "reader function must return a string"); + lua_replace(L, RESERVEDSLOT); /* save string in reserved slot */ + return lua_tolstring(L, RESERVEDSLOT, size); +} + + +static int luaB_load (lua_State *L) { + int status; + size_t l; + const char *s = lua_tolstring(L, 1, &l); + const char *mode = luaL_optstring(L, 3, "bt"); + int env = (!lua_isnone(L, 4) ? 4 : 0); /* 'env' index or 0 if no 'env' */ + if (s != NULL) { /* loading a string? */ + const char *chunkname = luaL_optstring(L, 2, s); + status = luaL_loadbufferx(L, s, l, chunkname, mode); + } + else { /* loading from a reader function */ + const char *chunkname = luaL_optstring(L, 2, "=(load)"); + luaL_checktype(L, 1, LUA_TFUNCTION); + lua_settop(L, RESERVEDSLOT); /* create reserved slot */ + status = lua_load(L, generic_reader, NULL, chunkname, mode); + } + return load_aux(L, status, env); +} + +/* }====================================================== */ + + +static int dofilecont (lua_State *L, int d1, lua_KContext d2) { + (void)d1; (void)d2; /* only to match 'lua_Kfunction' prototype */ + return lua_gettop(L) - 1; +} + + +static int luaB_dofile (lua_State *L) { + const char *fname = luaL_optstring(L, 1, NULL); + lua_settop(L, 1); + if (l_unlikely(luaL_loadfile(L, fname) != LUA_OK)) + return lua_error(L); + lua_callk(L, 0, LUA_MULTRET, 0, dofilecont); + return dofilecont(L, 0, 0); +} + + +static int luaB_assert (lua_State *L) { + if (l_likely(lua_toboolean(L, 1))) /* condition is true? */ + return lua_gettop(L); /* return all arguments */ + else { /* error */ + luaL_checkany(L, 1); /* there must be a condition */ + lua_remove(L, 1); /* remove it */ + lua_pushliteral(L, "assertion failed!"); /* default message */ + lua_settop(L, 1); /* leave only message (default if no other one) */ + return luaB_error(L); /* call 'error' */ + } +} + + +static int luaB_select (lua_State *L) { + int n = lua_gettop(L); + if (lua_type(L, 1) == LUA_TSTRING && *lua_tostring(L, 1) == '#') { + lua_pushinteger(L, n-1); + return 1; + } + else { + lua_Integer i = luaL_checkinteger(L, 1); + if (i < 0) i = n + i; + else if (i > n) i = n; + luaL_argcheck(L, 1 <= i, 1, "index out of range"); + return n - (int)i; + } +} + + +/* +** Continuation function for 'pcall' and 'xpcall'. Both functions +** already pushed a 'true' before doing the call, so in case of success +** 'finishpcall' only has to return everything in the stack minus +** 'extra' values (where 'extra' is exactly the number of items to be +** ignored). +*/ +static int finishpcall (lua_State *L, int status, lua_KContext extra) { + if (l_unlikely(status != LUA_OK && status != LUA_YIELD)) { /* error? */ + lua_pushboolean(L, 0); /* first result (false) */ + lua_pushvalue(L, -2); /* error message */ + return 2; /* return false, msg */ + } + else + return lua_gettop(L) - (int)extra; /* return all results */ +} + + +static int luaB_pcall (lua_State *L) { + int status; + luaL_checkany(L, 1); + lua_pushboolean(L, 1); /* first result if no errors */ + lua_insert(L, 1); /* put it in place */ + status = lua_pcallk(L, lua_gettop(L) - 2, LUA_MULTRET, 0, 0, finishpcall); + return finishpcall(L, status, 0); +} + + +/* +** Do a protected call with error handling. After 'lua_rotate', the +** stack will have ; so, the function passes +** 2 to 'finishpcall' to skip the 2 first values when returning results. +*/ +static int luaB_xpcall (lua_State *L) { + int status; + int n = lua_gettop(L); + luaL_checktype(L, 2, LUA_TFUNCTION); /* check error function */ + lua_pushboolean(L, 1); /* first result */ + lua_pushvalue(L, 1); /* function */ + lua_rotate(L, 3, 2); /* move them below function's arguments */ + status = lua_pcallk(L, n - 2, LUA_MULTRET, 2, 2, finishpcall); + return finishpcall(L, status, 2); +} + + +static int luaB_tostring (lua_State *L) { + luaL_checkany(L, 1); + luaL_tolstring(L, 1, NULL); + return 1; +} + + +static const luaL_Reg base_funcs[] = { + {"assert", luaB_assert}, + {"collectgarbage", luaB_collectgarbage}, + {"dofile", luaB_dofile}, + {"error", luaB_error}, + {"getmetatable", luaB_getmetatable}, + {"ipairs", luaB_ipairs}, + {"loadfile", luaB_loadfile}, + {"load", luaB_load}, + {"next", luaB_next}, + {"pairs", luaB_pairs}, + {"pcall", luaB_pcall}, + {"print", luaB_print}, + {"warn", luaB_warn}, + {"rawequal", luaB_rawequal}, + {"rawlen", luaB_rawlen}, + {"rawget", luaB_rawget}, + {"rawset", luaB_rawset}, + {"select", luaB_select}, + {"setmetatable", luaB_setmetatable}, + {"tonumber", luaB_tonumber}, + {"tostring", luaB_tostring}, + {"type", luaB_type}, + {"xpcall", luaB_xpcall}, + /* placeholders */ + {LUA_GNAME, NULL}, + {"_VERSION", NULL}, + {NULL, NULL} +}; + + +LUAMOD_API int luaopen_base (lua_State *L) { + /* open lib into global table */ + lua_pushglobaltable(L); + luaL_setfuncs(L, base_funcs, 0); + /* set global _G */ + lua_pushvalue(L, -1); + lua_setfield(L, -2, LUA_GNAME); + /* set global _VERSION */ + lua_pushliteral(L, LUA_VERSION); + lua_setfield(L, -2, "_VERSION"); + return 1; +} + diff --git a/06/lua-5.4.6/src/lcode.c b/06/lua-5.4.6/src/lcode.c new file mode 100644 index 0000000..1a371ca --- /dev/null +++ b/06/lua-5.4.6/src/lcode.c @@ -0,0 +1,1871 @@ +/* +** $Id: lcode.c $ +** Code generator for Lua +** See Copyright Notice in lua.h +*/ + +#define lcode_c +#define LUA_CORE + +#include "lprefix.h" + + +#include +#include +#include +#include + +#include "lua.h" + +#include "lcode.h" +#include "ldebug.h" +#include "ldo.h" +#include "lgc.h" +#include "llex.h" +#include "lmem.h" +#include "lobject.h" +#include "lopcodes.h" +#include "lparser.h" +#include "lstring.h" +#include "ltable.h" +#include "lvm.h" + + +/* Maximum number of registers in a Lua function (must fit in 8 bits) */ +#define MAXREGS 255 + + +#define hasjumps(e) ((e)->t != (e)->f) + + +static int codesJ (FuncState *fs, OpCode o, int sj, int k); + + + +/* semantic error */ +l_noret luaK_semerror (LexState *ls, const char *msg) { + ls->t.token = 0; /* remove "near " from final message */ + luaX_syntaxerror(ls, msg); +} + + +/* +** If expression is a numeric constant, fills 'v' with its value +** and returns 1. Otherwise, returns 0. +*/ +static int tonumeral (const expdesc *e, TValue *v) { + if (hasjumps(e)) + return 0; /* not a numeral */ + switch (e->k) { + case VKINT: + if (v) setivalue(v, e->u.ival); + return 1; + case VKFLT: + if (v) setfltvalue(v, e->u.nval); + return 1; + default: return 0; + } +} + + +/* +** Get the constant value from a constant expression +*/ +static TValue *const2val (FuncState *fs, const expdesc *e) { + lua_assert(e->k == VCONST); + return &fs->ls->dyd->actvar.arr[e->u.info].k; +} + + +/* +** If expression is a constant, fills 'v' with its value +** and returns 1. Otherwise, returns 0. +*/ +int luaK_exp2const (FuncState *fs, const expdesc *e, TValue *v) { + if (hasjumps(e)) + return 0; /* not a constant */ + switch (e->k) { + case VFALSE: + setbfvalue(v); + return 1; + case VTRUE: + setbtvalue(v); + return 1; + case VNIL: + setnilvalue(v); + return 1; + case VKSTR: { + setsvalue(fs->ls->L, v, e->u.strval); + return 1; + } + case VCONST: { + setobj(fs->ls->L, v, const2val(fs, e)); + return 1; + } + default: return tonumeral(e, v); + } +} + + +/* +** Return the previous instruction of the current code. If there +** may be a jump target between the current instruction and the +** previous one, return an invalid instruction (to avoid wrong +** optimizations). +*/ +static Instruction *previousinstruction (FuncState *fs) { + static const Instruction invalidinstruction = ~(Instruction)0; + if (fs->pc > fs->lasttarget) + return &fs->f->code[fs->pc - 1]; /* previous instruction */ + else + return cast(Instruction*, &invalidinstruction); +} + + +/* +** Create a OP_LOADNIL instruction, but try to optimize: if the previous +** instruction is also OP_LOADNIL and ranges are compatible, adjust +** range of previous instruction instead of emitting a new one. (For +** instance, 'local a; local b' will generate a single opcode.) +*/ +void luaK_nil (FuncState *fs, int from, int n) { + int l = from + n - 1; /* last register to set nil */ + Instruction *previous = previousinstruction(fs); + if (GET_OPCODE(*previous) == OP_LOADNIL) { /* previous is LOADNIL? */ + int pfrom = GETARG_A(*previous); /* get previous range */ + int pl = pfrom + GETARG_B(*previous); + if ((pfrom <= from && from <= pl + 1) || + (from <= pfrom && pfrom <= l + 1)) { /* can connect both? */ + if (pfrom < from) from = pfrom; /* from = min(from, pfrom) */ + if (pl > l) l = pl; /* l = max(l, pl) */ + SETARG_A(*previous, from); + SETARG_B(*previous, l - from); + return; + } /* else go through */ + } + luaK_codeABC(fs, OP_LOADNIL, from, n - 1, 0); /* else no optimization */ +} + + +/* +** Gets the destination address of a jump instruction. Used to traverse +** a list of jumps. +*/ +static int getjump (FuncState *fs, int pc) { + int offset = GETARG_sJ(fs->f->code[pc]); + if (offset == NO_JUMP) /* point to itself represents end of list */ + return NO_JUMP; /* end of list */ + else + return (pc+1)+offset; /* turn offset into absolute position */ +} + + +/* +** Fix jump instruction at position 'pc' to jump to 'dest'. +** (Jump addresses are relative in Lua) +*/ +static void fixjump (FuncState *fs, int pc, int dest) { + Instruction *jmp = &fs->f->code[pc]; + int offset = dest - (pc + 1); + lua_assert(dest != NO_JUMP); + if (!(-OFFSET_sJ <= offset && offset <= MAXARG_sJ - OFFSET_sJ)) + luaX_syntaxerror(fs->ls, "control structure too long"); + lua_assert(GET_OPCODE(*jmp) == OP_JMP); + SETARG_sJ(*jmp, offset); +} + + +/* +** Concatenate jump-list 'l2' into jump-list 'l1' +*/ +void luaK_concat (FuncState *fs, int *l1, int l2) { + if (l2 == NO_JUMP) return; /* nothing to concatenate? */ + else if (*l1 == NO_JUMP) /* no original list? */ + *l1 = l2; /* 'l1' points to 'l2' */ + else { + int list = *l1; + int next; + while ((next = getjump(fs, list)) != NO_JUMP) /* find last element */ + list = next; + fixjump(fs, list, l2); /* last element links to 'l2' */ + } +} + + +/* +** Create a jump instruction and return its position, so its destination +** can be fixed later (with 'fixjump'). +*/ +int luaK_jump (FuncState *fs) { + return codesJ(fs, OP_JMP, NO_JUMP, 0); +} + + +/* +** Code a 'return' instruction +*/ +void luaK_ret (FuncState *fs, int first, int nret) { + OpCode op; + switch (nret) { + case 0: op = OP_RETURN0; break; + case 1: op = OP_RETURN1; break; + default: op = OP_RETURN; break; + } + luaK_codeABC(fs, op, first, nret + 1, 0); +} + + +/* +** Code a "conditional jump", that is, a test or comparison opcode +** followed by a jump. Return jump position. +*/ +static int condjump (FuncState *fs, OpCode op, int A, int B, int C, int k) { + luaK_codeABCk(fs, op, A, B, C, k); + return luaK_jump(fs); +} + + +/* +** returns current 'pc' and marks it as a jump target (to avoid wrong +** optimizations with consecutive instructions not in the same basic block). +*/ +int luaK_getlabel (FuncState *fs) { + fs->lasttarget = fs->pc; + return fs->pc; +} + + +/* +** Returns the position of the instruction "controlling" a given +** jump (that is, its condition), or the jump itself if it is +** unconditional. +*/ +static Instruction *getjumpcontrol (FuncState *fs, int pc) { + Instruction *pi = &fs->f->code[pc]; + if (pc >= 1 && testTMode(GET_OPCODE(*(pi-1)))) + return pi-1; + else + return pi; +} + + +/* +** Patch destination register for a TESTSET instruction. +** If instruction in position 'node' is not a TESTSET, return 0 ("fails"). +** Otherwise, if 'reg' is not 'NO_REG', set it as the destination +** register. Otherwise, change instruction to a simple 'TEST' (produces +** no register value) +*/ +static int patchtestreg (FuncState *fs, int node, int reg) { + Instruction *i = getjumpcontrol(fs, node); + if (GET_OPCODE(*i) != OP_TESTSET) + return 0; /* cannot patch other instructions */ + if (reg != NO_REG && reg != GETARG_B(*i)) + SETARG_A(*i, reg); + else { + /* no register to put value or register already has the value; + change instruction to simple test */ + *i = CREATE_ABCk(OP_TEST, GETARG_B(*i), 0, 0, GETARG_k(*i)); + } + return 1; +} + + +/* +** Traverse a list of tests ensuring no one produces a value +*/ +static void removevalues (FuncState *fs, int list) { + for (; list != NO_JUMP; list = getjump(fs, list)) + patchtestreg(fs, list, NO_REG); +} + + +/* +** Traverse a list of tests, patching their destination address and +** registers: tests producing values jump to 'vtarget' (and put their +** values in 'reg'), other tests jump to 'dtarget'. +*/ +static void patchlistaux (FuncState *fs, int list, int vtarget, int reg, + int dtarget) { + while (list != NO_JUMP) { + int next = getjump(fs, list); + if (patchtestreg(fs, list, reg)) + fixjump(fs, list, vtarget); + else + fixjump(fs, list, dtarget); /* jump to default target */ + list = next; + } +} + + +/* +** Path all jumps in 'list' to jump to 'target'. +** (The assert means that we cannot fix a jump to a forward address +** because we only know addresses once code is generated.) +*/ +void luaK_patchlist (FuncState *fs, int list, int target) { + lua_assert(target <= fs->pc); + patchlistaux(fs, list, target, NO_REG, target); +} + + +void luaK_patchtohere (FuncState *fs, int list) { + int hr = luaK_getlabel(fs); /* mark "here" as a jump target */ + luaK_patchlist(fs, list, hr); +} + + +/* limit for difference between lines in relative line info. */ +#define LIMLINEDIFF 0x80 + + +/* +** Save line info for a new instruction. If difference from last line +** does not fit in a byte, of after that many instructions, save a new +** absolute line info; (in that case, the special value 'ABSLINEINFO' +** in 'lineinfo' signals the existence of this absolute information.) +** Otherwise, store the difference from last line in 'lineinfo'. +*/ +static void savelineinfo (FuncState *fs, Proto *f, int line) { + int linedif = line - fs->previousline; + int pc = fs->pc - 1; /* last instruction coded */ + if (abs(linedif) >= LIMLINEDIFF || fs->iwthabs++ >= MAXIWTHABS) { + luaM_growvector(fs->ls->L, f->abslineinfo, fs->nabslineinfo, + f->sizeabslineinfo, AbsLineInfo, MAX_INT, "lines"); + f->abslineinfo[fs->nabslineinfo].pc = pc; + f->abslineinfo[fs->nabslineinfo++].line = line; + linedif = ABSLINEINFO; /* signal that there is absolute information */ + fs->iwthabs = 1; /* restart counter */ + } + luaM_growvector(fs->ls->L, f->lineinfo, pc, f->sizelineinfo, ls_byte, + MAX_INT, "opcodes"); + f->lineinfo[pc] = linedif; + fs->previousline = line; /* last line saved */ +} + + +/* +** Remove line information from the last instruction. +** If line information for that instruction is absolute, set 'iwthabs' +** above its max to force the new (replacing) instruction to have +** absolute line info, too. +*/ +static void removelastlineinfo (FuncState *fs) { + Proto *f = fs->f; + int pc = fs->pc - 1; /* last instruction coded */ + if (f->lineinfo[pc] != ABSLINEINFO) { /* relative line info? */ + fs->previousline -= f->lineinfo[pc]; /* correct last line saved */ + fs->iwthabs--; /* undo previous increment */ + } + else { /* absolute line information */ + lua_assert(f->abslineinfo[fs->nabslineinfo - 1].pc == pc); + fs->nabslineinfo--; /* remove it */ + fs->iwthabs = MAXIWTHABS + 1; /* force next line info to be absolute */ + } +} + + +/* +** Remove the last instruction created, correcting line information +** accordingly. +*/ +static void removelastinstruction (FuncState *fs) { + removelastlineinfo(fs); + fs->pc--; +} + + +/* +** Emit instruction 'i', checking for array sizes and saving also its +** line information. Return 'i' position. +*/ +int luaK_code (FuncState *fs, Instruction i) { + Proto *f = fs->f; + /* put new instruction in code array */ + luaM_growvector(fs->ls->L, f->code, fs->pc, f->sizecode, Instruction, + MAX_INT, "opcodes"); + f->code[fs->pc++] = i; + savelineinfo(fs, f, fs->ls->lastline); + return fs->pc - 1; /* index of new instruction */ +} + + +/* +** Format and emit an 'iABC' instruction. (Assertions check consistency +** of parameters versus opcode.) +*/ +int luaK_codeABCk (FuncState *fs, OpCode o, int a, int b, int c, int k) { + lua_assert(getOpMode(o) == iABC); + lua_assert(a <= MAXARG_A && b <= MAXARG_B && + c <= MAXARG_C && (k & ~1) == 0); + return luaK_code(fs, CREATE_ABCk(o, a, b, c, k)); +} + + +/* +** Format and emit an 'iABx' instruction. +*/ +int luaK_codeABx (FuncState *fs, OpCode o, int a, unsigned int bc) { + lua_assert(getOpMode(o) == iABx); + lua_assert(a <= MAXARG_A && bc <= MAXARG_Bx); + return luaK_code(fs, CREATE_ABx(o, a, bc)); +} + + +/* +** Format and emit an 'iAsBx' instruction. +*/ +int luaK_codeAsBx (FuncState *fs, OpCode o, int a, int bc) { + unsigned int b = bc + OFFSET_sBx; + lua_assert(getOpMode(o) == iAsBx); + lua_assert(a <= MAXARG_A && b <= MAXARG_Bx); + return luaK_code(fs, CREATE_ABx(o, a, b)); +} + + +/* +** Format and emit an 'isJ' instruction. +*/ +static int codesJ (FuncState *fs, OpCode o, int sj, int k) { + unsigned int j = sj + OFFSET_sJ; + lua_assert(getOpMode(o) == isJ); + lua_assert(j <= MAXARG_sJ && (k & ~1) == 0); + return luaK_code(fs, CREATE_sJ(o, j, k)); +} + + +/* +** Emit an "extra argument" instruction (format 'iAx') +*/ +static int codeextraarg (FuncState *fs, int a) { + lua_assert(a <= MAXARG_Ax); + return luaK_code(fs, CREATE_Ax(OP_EXTRAARG, a)); +} + + +/* +** Emit a "load constant" instruction, using either 'OP_LOADK' +** (if constant index 'k' fits in 18 bits) or an 'OP_LOADKX' +** instruction with "extra argument". +*/ +static int luaK_codek (FuncState *fs, int reg, int k) { + if (k <= MAXARG_Bx) + return luaK_codeABx(fs, OP_LOADK, reg, k); + else { + int p = luaK_codeABx(fs, OP_LOADKX, reg, 0); + codeextraarg(fs, k); + return p; + } +} + + +/* +** Check register-stack level, keeping track of its maximum size +** in field 'maxstacksize' +*/ +void luaK_checkstack (FuncState *fs, int n) { + int newstack = fs->freereg + n; + if (newstack > fs->f->maxstacksize) { + if (newstack >= MAXREGS) + luaX_syntaxerror(fs->ls, + "function or expression needs too many registers"); + fs->f->maxstacksize = cast_byte(newstack); + } +} + + +/* +** Reserve 'n' registers in register stack +*/ +void luaK_reserveregs (FuncState *fs, int n) { + luaK_checkstack(fs, n); + fs->freereg += n; +} + + +/* +** Free register 'reg', if it is neither a constant index nor +** a local variable. +) +*/ +static void freereg (FuncState *fs, int reg) { + if (reg >= luaY_nvarstack(fs)) { + fs->freereg--; + lua_assert(reg == fs->freereg); + } +} + + +/* +** Free two registers in proper order +*/ +static void freeregs (FuncState *fs, int r1, int r2) { + if (r1 > r2) { + freereg(fs, r1); + freereg(fs, r2); + } + else { + freereg(fs, r2); + freereg(fs, r1); + } +} + + +/* +** Free register used by expression 'e' (if any) +*/ +static void freeexp (FuncState *fs, expdesc *e) { + if (e->k == VNONRELOC) + freereg(fs, e->u.info); +} + + +/* +** Free registers used by expressions 'e1' and 'e2' (if any) in proper +** order. +*/ +static void freeexps (FuncState *fs, expdesc *e1, expdesc *e2) { + int r1 = (e1->k == VNONRELOC) ? e1->u.info : -1; + int r2 = (e2->k == VNONRELOC) ? e2->u.info : -1; + freeregs(fs, r1, r2); +} + + +/* +** Add constant 'v' to prototype's list of constants (field 'k'). +** Use scanner's table to cache position of constants in constant list +** and try to reuse constants. Because some values should not be used +** as keys (nil cannot be a key, integer keys can collapse with float +** keys), the caller must provide a useful 'key' for indexing the cache. +** Note that all functions share the same table, so entering or exiting +** a function can make some indices wrong. +*/ +static int addk (FuncState *fs, TValue *key, TValue *v) { + TValue val; + lua_State *L = fs->ls->L; + Proto *f = fs->f; + const TValue *idx = luaH_get(fs->ls->h, key); /* query scanner table */ + int k, oldsize; + if (ttisinteger(idx)) { /* is there an index there? */ + k = cast_int(ivalue(idx)); + /* correct value? (warning: must distinguish floats from integers!) */ + if (k < fs->nk && ttypetag(&f->k[k]) == ttypetag(v) && + luaV_rawequalobj(&f->k[k], v)) + return k; /* reuse index */ + } + /* constant not found; create a new entry */ + oldsize = f->sizek; + k = fs->nk; + /* numerical value does not need GC barrier; + table has no metatable, so it does not need to invalidate cache */ + setivalue(&val, k); + luaH_finishset(L, fs->ls->h, key, idx, &val); + luaM_growvector(L, f->k, k, f->sizek, TValue, MAXARG_Ax, "constants"); + while (oldsize < f->sizek) setnilvalue(&f->k[oldsize++]); + setobj(L, &f->k[k], v); + fs->nk++; + luaC_barrier(L, f, v); + return k; +} + + +/* +** Add a string to list of constants and return its index. +*/ +static int stringK (FuncState *fs, TString *s) { + TValue o; + setsvalue(fs->ls->L, &o, s); + return addk(fs, &o, &o); /* use string itself as key */ +} + + +/* +** Add an integer to list of constants and return its index. +*/ +static int luaK_intK (FuncState *fs, lua_Integer n) { + TValue o; + setivalue(&o, n); + return addk(fs, &o, &o); /* use integer itself as key */ +} + +/* +** Add a float to list of constants and return its index. Floats +** with integral values need a different key, to avoid collision +** with actual integers. To that, we add to the number its smaller +** power-of-two fraction that is still significant in its scale. +** For doubles, that would be 1/2^52. +** (This method is not bulletproof: there may be another float +** with that value, and for floats larger than 2^53 the result is +** still an integer. At worst, this only wastes an entry with +** a duplicate.) +*/ +static int luaK_numberK (FuncState *fs, lua_Number r) { + TValue o; + lua_Integer ik; + setfltvalue(&o, r); + if (!luaV_flttointeger(r, &ik, F2Ieq)) /* not an integral value? */ + return addk(fs, &o, &o); /* use number itself as key */ + else { /* must build an alternative key */ + const int nbm = l_floatatt(MANT_DIG); + const lua_Number q = l_mathop(ldexp)(l_mathop(1.0), -nbm + 1); + const lua_Number k = (ik == 0) ? q : r + r*q; /* new key */ + TValue kv; + setfltvalue(&kv, k); + /* result is not an integral value, unless value is too large */ + lua_assert(!luaV_flttointeger(k, &ik, F2Ieq) || + l_mathop(fabs)(r) >= l_mathop(1e6)); + return addk(fs, &kv, &o); + } +} + + +/* +** Add a false to list of constants and return its index. +*/ +static int boolF (FuncState *fs) { + TValue o; + setbfvalue(&o); + return addk(fs, &o, &o); /* use boolean itself as key */ +} + + +/* +** Add a true to list of constants and return its index. +*/ +static int boolT (FuncState *fs) { + TValue o; + setbtvalue(&o); + return addk(fs, &o, &o); /* use boolean itself as key */ +} + + +/* +** Add nil to list of constants and return its index. +*/ +static int nilK (FuncState *fs) { + TValue k, v; + setnilvalue(&v); + /* cannot use nil as key; instead use table itself to represent nil */ + sethvalue(fs->ls->L, &k, fs->ls->h); + return addk(fs, &k, &v); +} + + +/* +** Check whether 'i' can be stored in an 'sC' operand. Equivalent to +** (0 <= int2sC(i) && int2sC(i) <= MAXARG_C) but without risk of +** overflows in the hidden addition inside 'int2sC'. +*/ +static int fitsC (lua_Integer i) { + return (l_castS2U(i) + OFFSET_sC <= cast_uint(MAXARG_C)); +} + + +/* +** Check whether 'i' can be stored in an 'sBx' operand. +*/ +static int fitsBx (lua_Integer i) { + return (-OFFSET_sBx <= i && i <= MAXARG_Bx - OFFSET_sBx); +} + + +void luaK_int (FuncState *fs, int reg, lua_Integer i) { + if (fitsBx(i)) + luaK_codeAsBx(fs, OP_LOADI, reg, cast_int(i)); + else + luaK_codek(fs, reg, luaK_intK(fs, i)); +} + + +static void luaK_float (FuncState *fs, int reg, lua_Number f) { + lua_Integer fi; + if (luaV_flttointeger(f, &fi, F2Ieq) && fitsBx(fi)) + luaK_codeAsBx(fs, OP_LOADF, reg, cast_int(fi)); + else + luaK_codek(fs, reg, luaK_numberK(fs, f)); +} + + +/* +** Convert a constant in 'v' into an expression description 'e' +*/ +static void const2exp (TValue *v, expdesc *e) { + switch (ttypetag(v)) { + case LUA_VNUMINT: + e->k = VKINT; e->u.ival = ivalue(v); + break; + case LUA_VNUMFLT: + e->k = VKFLT; e->u.nval = fltvalue(v); + break; + case LUA_VFALSE: + e->k = VFALSE; + break; + case LUA_VTRUE: + e->k = VTRUE; + break; + case LUA_VNIL: + e->k = VNIL; + break; + case LUA_VSHRSTR: case LUA_VLNGSTR: + e->k = VKSTR; e->u.strval = tsvalue(v); + break; + default: lua_assert(0); + } +} + + +/* +** Fix an expression to return the number of results 'nresults'. +** 'e' must be a multi-ret expression (function call or vararg). +*/ +void luaK_setreturns (FuncState *fs, expdesc *e, int nresults) { + Instruction *pc = &getinstruction(fs, e); + if (e->k == VCALL) /* expression is an open function call? */ + SETARG_C(*pc, nresults + 1); + else { + lua_assert(e->k == VVARARG); + SETARG_C(*pc, nresults + 1); + SETARG_A(*pc, fs->freereg); + luaK_reserveregs(fs, 1); + } +} + + +/* +** Convert a VKSTR to a VK +*/ +static void str2K (FuncState *fs, expdesc *e) { + lua_assert(e->k == VKSTR); + e->u.info = stringK(fs, e->u.strval); + e->k = VK; +} + + +/* +** Fix an expression to return one result. +** If expression is not a multi-ret expression (function call or +** vararg), it already returns one result, so nothing needs to be done. +** Function calls become VNONRELOC expressions (as its result comes +** fixed in the base register of the call), while vararg expressions +** become VRELOC (as OP_VARARG puts its results where it wants). +** (Calls are created returning one result, so that does not need +** to be fixed.) +*/ +void luaK_setoneret (FuncState *fs, expdesc *e) { + if (e->k == VCALL) { /* expression is an open function call? */ + /* already returns 1 value */ + lua_assert(GETARG_C(getinstruction(fs, e)) == 2); + e->k = VNONRELOC; /* result has fixed position */ + e->u.info = GETARG_A(getinstruction(fs, e)); + } + else if (e->k == VVARARG) { + SETARG_C(getinstruction(fs, e), 2); + e->k = VRELOC; /* can relocate its simple result */ + } +} + + +/* +** Ensure that expression 'e' is not a variable (nor a ). +** (Expression still may have jump lists.) +*/ +void luaK_dischargevars (FuncState *fs, expdesc *e) { + switch (e->k) { + case VCONST: { + const2exp(const2val(fs, e), e); + break; + } + case VLOCAL: { /* already in a register */ + e->u.info = e->u.var.ridx; + e->k = VNONRELOC; /* becomes a non-relocatable value */ + break; + } + case VUPVAL: { /* move value to some (pending) register */ + e->u.info = luaK_codeABC(fs, OP_GETUPVAL, 0, e->u.info, 0); + e->k = VRELOC; + break; + } + case VINDEXUP: { + e->u.info = luaK_codeABC(fs, OP_GETTABUP, 0, e->u.ind.t, e->u.ind.idx); + e->k = VRELOC; + break; + } + case VINDEXI: { + freereg(fs, e->u.ind.t); + e->u.info = luaK_codeABC(fs, OP_GETI, 0, e->u.ind.t, e->u.ind.idx); + e->k = VRELOC; + break; + } + case VINDEXSTR: { + freereg(fs, e->u.ind.t); + e->u.info = luaK_codeABC(fs, OP_GETFIELD, 0, e->u.ind.t, e->u.ind.idx); + e->k = VRELOC; + break; + } + case VINDEXED: { + freeregs(fs, e->u.ind.t, e->u.ind.idx); + e->u.info = luaK_codeABC(fs, OP_GETTABLE, 0, e->u.ind.t, e->u.ind.idx); + e->k = VRELOC; + break; + } + case VVARARG: case VCALL: { + luaK_setoneret(fs, e); + break; + } + default: break; /* there is one value available (somewhere) */ + } +} + + +/* +** Ensure expression value is in register 'reg', making 'e' a +** non-relocatable expression. +** (Expression still may have jump lists.) +*/ +static void discharge2reg (FuncState *fs, expdesc *e, int reg) { + luaK_dischargevars(fs, e); + switch (e->k) { + case VNIL: { + luaK_nil(fs, reg, 1); + break; + } + case VFALSE: { + luaK_codeABC(fs, OP_LOADFALSE, reg, 0, 0); + break; + } + case VTRUE: { + luaK_codeABC(fs, OP_LOADTRUE, reg, 0, 0); + break; + } + case VKSTR: { + str2K(fs, e); + } /* FALLTHROUGH */ + case VK: { + luaK_codek(fs, reg, e->u.info); + break; + } + case VKFLT: { + luaK_float(fs, reg, e->u.nval); + break; + } + case VKINT: { + luaK_int(fs, reg, e->u.ival); + break; + } + case VRELOC: { + Instruction *pc = &getinstruction(fs, e); + SETARG_A(*pc, reg); /* instruction will put result in 'reg' */ + break; + } + case VNONRELOC: { + if (reg != e->u.info) + luaK_codeABC(fs, OP_MOVE, reg, e->u.info, 0); + break; + } + default: { + lua_assert(e->k == VJMP); + return; /* nothing to do... */ + } + } + e->u.info = reg; + e->k = VNONRELOC; +} + + +/* +** Ensure expression value is in a register, making 'e' a +** non-relocatable expression. +** (Expression still may have jump lists.) +*/ +static void discharge2anyreg (FuncState *fs, expdesc *e) { + if (e->k != VNONRELOC) { /* no fixed register yet? */ + luaK_reserveregs(fs, 1); /* get a register */ + discharge2reg(fs, e, fs->freereg-1); /* put value there */ + } +} + + +static int code_loadbool (FuncState *fs, int A, OpCode op) { + luaK_getlabel(fs); /* those instructions may be jump targets */ + return luaK_codeABC(fs, op, A, 0, 0); +} + + +/* +** check whether list has any jump that do not produce a value +** or produce an inverted value +*/ +static int need_value (FuncState *fs, int list) { + for (; list != NO_JUMP; list = getjump(fs, list)) { + Instruction i = *getjumpcontrol(fs, list); + if (GET_OPCODE(i) != OP_TESTSET) return 1; + } + return 0; /* not found */ +} + + +/* +** Ensures final expression result (which includes results from its +** jump lists) is in register 'reg'. +** If expression has jumps, need to patch these jumps either to +** its final position or to "load" instructions (for those tests +** that do not produce values). +*/ +static void exp2reg (FuncState *fs, expdesc *e, int reg) { + discharge2reg(fs, e, reg); + if (e->k == VJMP) /* expression itself is a test? */ + luaK_concat(fs, &e->t, e->u.info); /* put this jump in 't' list */ + if (hasjumps(e)) { + int final; /* position after whole expression */ + int p_f = NO_JUMP; /* position of an eventual LOAD false */ + int p_t = NO_JUMP; /* position of an eventual LOAD true */ + if (need_value(fs, e->t) || need_value(fs, e->f)) { + int fj = (e->k == VJMP) ? NO_JUMP : luaK_jump(fs); + p_f = code_loadbool(fs, reg, OP_LFALSESKIP); /* skip next inst. */ + p_t = code_loadbool(fs, reg, OP_LOADTRUE); + /* jump around these booleans if 'e' is not a test */ + luaK_patchtohere(fs, fj); + } + final = luaK_getlabel(fs); + patchlistaux(fs, e->f, final, reg, p_f); + patchlistaux(fs, e->t, final, reg, p_t); + } + e->f = e->t = NO_JUMP; + e->u.info = reg; + e->k = VNONRELOC; +} + + +/* +** Ensures final expression result is in next available register. +*/ +void luaK_exp2nextreg (FuncState *fs, expdesc *e) { + luaK_dischargevars(fs, e); + freeexp(fs, e); + luaK_reserveregs(fs, 1); + exp2reg(fs, e, fs->freereg - 1); +} + + +/* +** Ensures final expression result is in some (any) register +** and return that register. +*/ +int luaK_exp2anyreg (FuncState *fs, expdesc *e) { + luaK_dischargevars(fs, e); + if (e->k == VNONRELOC) { /* expression already has a register? */ + if (!hasjumps(e)) /* no jumps? */ + return e->u.info; /* result is already in a register */ + if (e->u.info >= luaY_nvarstack(fs)) { /* reg. is not a local? */ + exp2reg(fs, e, e->u.info); /* put final result in it */ + return e->u.info; + } + /* else expression has jumps and cannot change its register + to hold the jump values, because it is a local variable. + Go through to the default case. */ + } + luaK_exp2nextreg(fs, e); /* default: use next available register */ + return e->u.info; +} + + +/* +** Ensures final expression result is either in a register +** or in an upvalue. +*/ +void luaK_exp2anyregup (FuncState *fs, expdesc *e) { + if (e->k != VUPVAL || hasjumps(e)) + luaK_exp2anyreg(fs, e); +} + + +/* +** Ensures final expression result is either in a register +** or it is a constant. +*/ +void luaK_exp2val (FuncState *fs, expdesc *e) { + if (hasjumps(e)) + luaK_exp2anyreg(fs, e); + else + luaK_dischargevars(fs, e); +} + + +/* +** Try to make 'e' a K expression with an index in the range of R/K +** indices. Return true iff succeeded. +*/ +static int luaK_exp2K (FuncState *fs, expdesc *e) { + if (!hasjumps(e)) { + int info; + switch (e->k) { /* move constants to 'k' */ + case VTRUE: info = boolT(fs); break; + case VFALSE: info = boolF(fs); break; + case VNIL: info = nilK(fs); break; + case VKINT: info = luaK_intK(fs, e->u.ival); break; + case VKFLT: info = luaK_numberK(fs, e->u.nval); break; + case VKSTR: info = stringK(fs, e->u.strval); break; + case VK: info = e->u.info; break; + default: return 0; /* not a constant */ + } + if (info <= MAXINDEXRK) { /* does constant fit in 'argC'? */ + e->k = VK; /* make expression a 'K' expression */ + e->u.info = info; + return 1; + } + } + /* else, expression doesn't fit; leave it unchanged */ + return 0; +} + + +/* +** Ensures final expression result is in a valid R/K index +** (that is, it is either in a register or in 'k' with an index +** in the range of R/K indices). +** Returns 1 iff expression is K. +*/ +int luaK_exp2RK (FuncState *fs, expdesc *e) { + if (luaK_exp2K(fs, e)) + return 1; + else { /* not a constant in the right range: put it in a register */ + luaK_exp2anyreg(fs, e); + return 0; + } +} + + +static void codeABRK (FuncState *fs, OpCode o, int a, int b, + expdesc *ec) { + int k = luaK_exp2RK(fs, ec); + luaK_codeABCk(fs, o, a, b, ec->u.info, k); +} + + +/* +** Generate code to store result of expression 'ex' into variable 'var'. +*/ +void luaK_storevar (FuncState *fs, expdesc *var, expdesc *ex) { + switch (var->k) { + case VLOCAL: { + freeexp(fs, ex); + exp2reg(fs, ex, var->u.var.ridx); /* compute 'ex' into proper place */ + return; + } + case VUPVAL: { + int e = luaK_exp2anyreg(fs, ex); + luaK_codeABC(fs, OP_SETUPVAL, e, var->u.info, 0); + break; + } + case VINDEXUP: { + codeABRK(fs, OP_SETTABUP, var->u.ind.t, var->u.ind.idx, ex); + break; + } + case VINDEXI: { + codeABRK(fs, OP_SETI, var->u.ind.t, var->u.ind.idx, ex); + break; + } + case VINDEXSTR: { + codeABRK(fs, OP_SETFIELD, var->u.ind.t, var->u.ind.idx, ex); + break; + } + case VINDEXED: { + codeABRK(fs, OP_SETTABLE, var->u.ind.t, var->u.ind.idx, ex); + break; + } + default: lua_assert(0); /* invalid var kind to store */ + } + freeexp(fs, ex); +} + + +/* +** Emit SELF instruction (convert expression 'e' into 'e:key(e,'). +*/ +void luaK_self (FuncState *fs, expdesc *e, expdesc *key) { + int ereg; + luaK_exp2anyreg(fs, e); + ereg = e->u.info; /* register where 'e' was placed */ + freeexp(fs, e); + e->u.info = fs->freereg; /* base register for op_self */ + e->k = VNONRELOC; /* self expression has a fixed register */ + luaK_reserveregs(fs, 2); /* function and 'self' produced by op_self */ + codeABRK(fs, OP_SELF, e->u.info, ereg, key); + freeexp(fs, key); +} + + +/* +** Negate condition 'e' (where 'e' is a comparison). +*/ +static void negatecondition (FuncState *fs, expdesc *e) { + Instruction *pc = getjumpcontrol(fs, e->u.info); + lua_assert(testTMode(GET_OPCODE(*pc)) && GET_OPCODE(*pc) != OP_TESTSET && + GET_OPCODE(*pc) != OP_TEST); + SETARG_k(*pc, (GETARG_k(*pc) ^ 1)); +} + + +/* +** Emit instruction to jump if 'e' is 'cond' (that is, if 'cond' +** is true, code will jump if 'e' is true.) Return jump position. +** Optimize when 'e' is 'not' something, inverting the condition +** and removing the 'not'. +*/ +static int jumponcond (FuncState *fs, expdesc *e, int cond) { + if (e->k == VRELOC) { + Instruction ie = getinstruction(fs, e); + if (GET_OPCODE(ie) == OP_NOT) { + removelastinstruction(fs); /* remove previous OP_NOT */ + return condjump(fs, OP_TEST, GETARG_B(ie), 0, 0, !cond); + } + /* else go through */ + } + discharge2anyreg(fs, e); + freeexp(fs, e); + return condjump(fs, OP_TESTSET, NO_REG, e->u.info, 0, cond); +} + + +/* +** Emit code to go through if 'e' is true, jump otherwise. +*/ +void luaK_goiftrue (FuncState *fs, expdesc *e) { + int pc; /* pc of new jump */ + luaK_dischargevars(fs, e); + switch (e->k) { + case VJMP: { /* condition? */ + negatecondition(fs, e); /* jump when it is false */ + pc = e->u.info; /* save jump position */ + break; + } + case VK: case VKFLT: case VKINT: case VKSTR: case VTRUE: { + pc = NO_JUMP; /* always true; do nothing */ + break; + } + default: { + pc = jumponcond(fs, e, 0); /* jump when false */ + break; + } + } + luaK_concat(fs, &e->f, pc); /* insert new jump in false list */ + luaK_patchtohere(fs, e->t); /* true list jumps to here (to go through) */ + e->t = NO_JUMP; +} + + +/* +** Emit code to go through if 'e' is false, jump otherwise. +*/ +void luaK_goiffalse (FuncState *fs, expdesc *e) { + int pc; /* pc of new jump */ + luaK_dischargevars(fs, e); + switch (e->k) { + case VJMP: { + pc = e->u.info; /* already jump if true */ + break; + } + case VNIL: case VFALSE: { + pc = NO_JUMP; /* always false; do nothing */ + break; + } + default: { + pc = jumponcond(fs, e, 1); /* jump if true */ + break; + } + } + luaK_concat(fs, &e->t, pc); /* insert new jump in 't' list */ + luaK_patchtohere(fs, e->f); /* false list jumps to here (to go through) */ + e->f = NO_JUMP; +} + + +/* +** Code 'not e', doing constant folding. +*/ +static void codenot (FuncState *fs, expdesc *e) { + switch (e->k) { + case VNIL: case VFALSE: { + e->k = VTRUE; /* true == not nil == not false */ + break; + } + case VK: case VKFLT: case VKINT: case VKSTR: case VTRUE: { + e->k = VFALSE; /* false == not "x" == not 0.5 == not 1 == not true */ + break; + } + case VJMP: { + negatecondition(fs, e); + break; + } + case VRELOC: + case VNONRELOC: { + discharge2anyreg(fs, e); + freeexp(fs, e); + e->u.info = luaK_codeABC(fs, OP_NOT, 0, e->u.info, 0); + e->k = VRELOC; + break; + } + default: lua_assert(0); /* cannot happen */ + } + /* interchange true and false lists */ + { int temp = e->f; e->f = e->t; e->t = temp; } + removevalues(fs, e->f); /* values are useless when negated */ + removevalues(fs, e->t); +} + + +/* +** Check whether expression 'e' is a small literal string +*/ +static int isKstr (FuncState *fs, expdesc *e) { + return (e->k == VK && !hasjumps(e) && e->u.info <= MAXARG_B && + ttisshrstring(&fs->f->k[e->u.info])); +} + +/* +** Check whether expression 'e' is a literal integer. +*/ +int luaK_isKint (expdesc *e) { + return (e->k == VKINT && !hasjumps(e)); +} + + +/* +** Check whether expression 'e' is a literal integer in +** proper range to fit in register C +*/ +static int isCint (expdesc *e) { + return luaK_isKint(e) && (l_castS2U(e->u.ival) <= l_castS2U(MAXARG_C)); +} + + +/* +** Check whether expression 'e' is a literal integer in +** proper range to fit in register sC +*/ +static int isSCint (expdesc *e) { + return luaK_isKint(e) && fitsC(e->u.ival); +} + + +/* +** Check whether expression 'e' is a literal integer or float in +** proper range to fit in a register (sB or sC). +*/ +static int isSCnumber (expdesc *e, int *pi, int *isfloat) { + lua_Integer i; + if (e->k == VKINT) + i = e->u.ival; + else if (e->k == VKFLT && luaV_flttointeger(e->u.nval, &i, F2Ieq)) + *isfloat = 1; + else + return 0; /* not a number */ + if (!hasjumps(e) && fitsC(i)) { + *pi = int2sC(cast_int(i)); + return 1; + } + else + return 0; +} + + +/* +** Create expression 't[k]'. 't' must have its final result already in a +** register or upvalue. Upvalues can only be indexed by literal strings. +** Keys can be literal strings in the constant table or arbitrary +** values in registers. +*/ +void luaK_indexed (FuncState *fs, expdesc *t, expdesc *k) { + if (k->k == VKSTR) + str2K(fs, k); + lua_assert(!hasjumps(t) && + (t->k == VLOCAL || t->k == VNONRELOC || t->k == VUPVAL)); + if (t->k == VUPVAL && !isKstr(fs, k)) /* upvalue indexed by non 'Kstr'? */ + luaK_exp2anyreg(fs, t); /* put it in a register */ + if (t->k == VUPVAL) { + t->u.ind.t = t->u.info; /* upvalue index */ + t->u.ind.idx = k->u.info; /* literal string */ + t->k = VINDEXUP; + } + else { + /* register index of the table */ + t->u.ind.t = (t->k == VLOCAL) ? t->u.var.ridx: t->u.info; + if (isKstr(fs, k)) { + t->u.ind.idx = k->u.info; /* literal string */ + t->k = VINDEXSTR; + } + else if (isCint(k)) { + t->u.ind.idx = cast_int(k->u.ival); /* int. constant in proper range */ + t->k = VINDEXI; + } + else { + t->u.ind.idx = luaK_exp2anyreg(fs, k); /* register */ + t->k = VINDEXED; + } + } +} + + +/* +** Return false if folding can raise an error. +** Bitwise operations need operands convertible to integers; division +** operations cannot have 0 as divisor. +*/ +static int validop (int op, TValue *v1, TValue *v2) { + switch (op) { + case LUA_OPBAND: case LUA_OPBOR: case LUA_OPBXOR: + case LUA_OPSHL: case LUA_OPSHR: case LUA_OPBNOT: { /* conversion errors */ + lua_Integer i; + return (luaV_tointegerns(v1, &i, LUA_FLOORN2I) && + luaV_tointegerns(v2, &i, LUA_FLOORN2I)); + } + case LUA_OPDIV: case LUA_OPIDIV: case LUA_OPMOD: /* division by 0 */ + return (nvalue(v2) != 0); + default: return 1; /* everything else is valid */ + } +} + + +/* +** Try to "constant-fold" an operation; return 1 iff successful. +** (In this case, 'e1' has the final result.) +*/ +static int constfolding (FuncState *fs, int op, expdesc *e1, + const expdesc *e2) { + TValue v1, v2, res; + if (!tonumeral(e1, &v1) || !tonumeral(e2, &v2) || !validop(op, &v1, &v2)) + return 0; /* non-numeric operands or not safe to fold */ + luaO_rawarith(fs->ls->L, op, &v1, &v2, &res); /* does operation */ + if (ttisinteger(&res)) { + e1->k = VKINT; + e1->u.ival = ivalue(&res); + } + else { /* folds neither NaN nor 0.0 (to avoid problems with -0.0) */ + lua_Number n = fltvalue(&res); + if (luai_numisnan(n) || n == 0) + return 0; + e1->k = VKFLT; + e1->u.nval = n; + } + return 1; +} + + +/* +** Convert a BinOpr to an OpCode (ORDER OPR - ORDER OP) +*/ +l_sinline OpCode binopr2op (BinOpr opr, BinOpr baser, OpCode base) { + lua_assert(baser <= opr && + ((baser == OPR_ADD && opr <= OPR_SHR) || + (baser == OPR_LT && opr <= OPR_LE))); + return cast(OpCode, (cast_int(opr) - cast_int(baser)) + cast_int(base)); +} + + +/* +** Convert a UnOpr to an OpCode (ORDER OPR - ORDER OP) +*/ +l_sinline OpCode unopr2op (UnOpr opr) { + return cast(OpCode, (cast_int(opr) - cast_int(OPR_MINUS)) + + cast_int(OP_UNM)); +} + + +/* +** Convert a BinOpr to a tag method (ORDER OPR - ORDER TM) +*/ +l_sinline TMS binopr2TM (BinOpr opr) { + lua_assert(OPR_ADD <= opr && opr <= OPR_SHR); + return cast(TMS, (cast_int(opr) - cast_int(OPR_ADD)) + cast_int(TM_ADD)); +} + + +/* +** Emit code for unary expressions that "produce values" +** (everything but 'not'). +** Expression to produce final result will be encoded in 'e'. +*/ +static void codeunexpval (FuncState *fs, OpCode op, expdesc *e, int line) { + int r = luaK_exp2anyreg(fs, e); /* opcodes operate only on registers */ + freeexp(fs, e); + e->u.info = luaK_codeABC(fs, op, 0, r, 0); /* generate opcode */ + e->k = VRELOC; /* all those operations are relocatable */ + luaK_fixline(fs, line); +} + + +/* +** Emit code for binary expressions that "produce values" +** (everything but logical operators 'and'/'or' and comparison +** operators). +** Expression to produce final result will be encoded in 'e1'. +*/ +static void finishbinexpval (FuncState *fs, expdesc *e1, expdesc *e2, + OpCode op, int v2, int flip, int line, + OpCode mmop, TMS event) { + int v1 = luaK_exp2anyreg(fs, e1); + int pc = luaK_codeABCk(fs, op, 0, v1, v2, 0); + freeexps(fs, e1, e2); + e1->u.info = pc; + e1->k = VRELOC; /* all those operations are relocatable */ + luaK_fixline(fs, line); + luaK_codeABCk(fs, mmop, v1, v2, event, flip); /* to call metamethod */ + luaK_fixline(fs, line); +} + + +/* +** Emit code for binary expressions that "produce values" over +** two registers. +*/ +static void codebinexpval (FuncState *fs, BinOpr opr, + expdesc *e1, expdesc *e2, int line) { + OpCode op = binopr2op(opr, OPR_ADD, OP_ADD); + int v2 = luaK_exp2anyreg(fs, e2); /* make sure 'e2' is in a register */ + /* 'e1' must be already in a register or it is a constant */ + lua_assert((VNIL <= e1->k && e1->k <= VKSTR) || + e1->k == VNONRELOC || e1->k == VRELOC); + lua_assert(OP_ADD <= op && op <= OP_SHR); + finishbinexpval(fs, e1, e2, op, v2, 0, line, OP_MMBIN, binopr2TM(opr)); +} + + +/* +** Code binary operators with immediate operands. +*/ +static void codebini (FuncState *fs, OpCode op, + expdesc *e1, expdesc *e2, int flip, int line, + TMS event) { + int v2 = int2sC(cast_int(e2->u.ival)); /* immediate operand */ + lua_assert(e2->k == VKINT); + finishbinexpval(fs, e1, e2, op, v2, flip, line, OP_MMBINI, event); +} + + +/* +** Code binary operators with K operand. +*/ +static void codebinK (FuncState *fs, BinOpr opr, + expdesc *e1, expdesc *e2, int flip, int line) { + TMS event = binopr2TM(opr); + int v2 = e2->u.info; /* K index */ + OpCode op = binopr2op(opr, OPR_ADD, OP_ADDK); + finishbinexpval(fs, e1, e2, op, v2, flip, line, OP_MMBINK, event); +} + + +/* Try to code a binary operator negating its second operand. +** For the metamethod, 2nd operand must keep its original value. +*/ +static int finishbinexpneg (FuncState *fs, expdesc *e1, expdesc *e2, + OpCode op, int line, TMS event) { + if (!luaK_isKint(e2)) + return 0; /* not an integer constant */ + else { + lua_Integer i2 = e2->u.ival; + if (!(fitsC(i2) && fitsC(-i2))) + return 0; /* not in the proper range */ + else { /* operating a small integer constant */ + int v2 = cast_int(i2); + finishbinexpval(fs, e1, e2, op, int2sC(-v2), 0, line, OP_MMBINI, event); + /* correct metamethod argument */ + SETARG_B(fs->f->code[fs->pc - 1], int2sC(v2)); + return 1; /* successfully coded */ + } + } +} + + +static void swapexps (expdesc *e1, expdesc *e2) { + expdesc temp = *e1; *e1 = *e2; *e2 = temp; /* swap 'e1' and 'e2' */ +} + + +/* +** Code binary operators with no constant operand. +*/ +static void codebinNoK (FuncState *fs, BinOpr opr, + expdesc *e1, expdesc *e2, int flip, int line) { + if (flip) + swapexps(e1, e2); /* back to original order */ + codebinexpval(fs, opr, e1, e2, line); /* use standard operators */ +} + + +/* +** Code arithmetic operators ('+', '-', ...). If second operand is a +** constant in the proper range, use variant opcodes with K operands. +*/ +static void codearith (FuncState *fs, BinOpr opr, + expdesc *e1, expdesc *e2, int flip, int line) { + if (tonumeral(e2, NULL) && luaK_exp2K(fs, e2)) /* K operand? */ + codebinK(fs, opr, e1, e2, flip, line); + else /* 'e2' is neither an immediate nor a K operand */ + codebinNoK(fs, opr, e1, e2, flip, line); +} + + +/* +** Code commutative operators ('+', '*'). If first operand is a +** numeric constant, change order of operands to try to use an +** immediate or K operator. +*/ +static void codecommutative (FuncState *fs, BinOpr op, + expdesc *e1, expdesc *e2, int line) { + int flip = 0; + if (tonumeral(e1, NULL)) { /* is first operand a numeric constant? */ + swapexps(e1, e2); /* change order */ + flip = 1; + } + if (op == OPR_ADD && isSCint(e2)) /* immediate operand? */ + codebini(fs, OP_ADDI, e1, e2, flip, line, TM_ADD); + else + codearith(fs, op, e1, e2, flip, line); +} + + +/* +** Code bitwise operations; they are all commutative, so the function +** tries to put an integer constant as the 2nd operand (a K operand). +*/ +static void codebitwise (FuncState *fs, BinOpr opr, + expdesc *e1, expdesc *e2, int line) { + int flip = 0; + if (e1->k == VKINT) { + swapexps(e1, e2); /* 'e2' will be the constant operand */ + flip = 1; + } + if (e2->k == VKINT && luaK_exp2K(fs, e2)) /* K operand? */ + codebinK(fs, opr, e1, e2, flip, line); + else /* no constants */ + codebinNoK(fs, opr, e1, e2, flip, line); +} + + +/* +** Emit code for order comparisons. When using an immediate operand, +** 'isfloat' tells whether the original value was a float. +*/ +static void codeorder (FuncState *fs, BinOpr opr, expdesc *e1, expdesc *e2) { + int r1, r2; + int im; + int isfloat = 0; + OpCode op; + if (isSCnumber(e2, &im, &isfloat)) { + /* use immediate operand */ + r1 = luaK_exp2anyreg(fs, e1); + r2 = im; + op = binopr2op(opr, OPR_LT, OP_LTI); + } + else if (isSCnumber(e1, &im, &isfloat)) { + /* transform (A < B) to (B > A) and (A <= B) to (B >= A) */ + r1 = luaK_exp2anyreg(fs, e2); + r2 = im; + op = binopr2op(opr, OPR_LT, OP_GTI); + } + else { /* regular case, compare two registers */ + r1 = luaK_exp2anyreg(fs, e1); + r2 = luaK_exp2anyreg(fs, e2); + op = binopr2op(opr, OPR_LT, OP_LT); + } + freeexps(fs, e1, e2); + e1->u.info = condjump(fs, op, r1, r2, isfloat, 1); + e1->k = VJMP; +} + + +/* +** Emit code for equality comparisons ('==', '~='). +** 'e1' was already put as RK by 'luaK_infix'. +*/ +static void codeeq (FuncState *fs, BinOpr opr, expdesc *e1, expdesc *e2) { + int r1, r2; + int im; + int isfloat = 0; /* not needed here, but kept for symmetry */ + OpCode op; + if (e1->k != VNONRELOC) { + lua_assert(e1->k == VK || e1->k == VKINT || e1->k == VKFLT); + swapexps(e1, e2); + } + r1 = luaK_exp2anyreg(fs, e1); /* 1st expression must be in register */ + if (isSCnumber(e2, &im, &isfloat)) { + op = OP_EQI; + r2 = im; /* immediate operand */ + } + else if (luaK_exp2RK(fs, e2)) { /* 2nd expression is constant? */ + op = OP_EQK; + r2 = e2->u.info; /* constant index */ + } + else { + op = OP_EQ; /* will compare two registers */ + r2 = luaK_exp2anyreg(fs, e2); + } + freeexps(fs, e1, e2); + e1->u.info = condjump(fs, op, r1, r2, isfloat, (opr == OPR_EQ)); + e1->k = VJMP; +} + + +/* +** Apply prefix operation 'op' to expression 'e'. +*/ +void luaK_prefix (FuncState *fs, UnOpr opr, expdesc *e, int line) { + static const expdesc ef = {VKINT, {0}, NO_JUMP, NO_JUMP}; + luaK_dischargevars(fs, e); + switch (opr) { + case OPR_MINUS: case OPR_BNOT: /* use 'ef' as fake 2nd operand */ + if (constfolding(fs, opr + LUA_OPUNM, e, &ef)) + break; + /* else */ /* FALLTHROUGH */ + case OPR_LEN: + codeunexpval(fs, unopr2op(opr), e, line); + break; + case OPR_NOT: codenot(fs, e); break; + default: lua_assert(0); + } +} + + +/* +** Process 1st operand 'v' of binary operation 'op' before reading +** 2nd operand. +*/ +void luaK_infix (FuncState *fs, BinOpr op, expdesc *v) { + luaK_dischargevars(fs, v); + switch (op) { + case OPR_AND: { + luaK_goiftrue(fs, v); /* go ahead only if 'v' is true */ + break; + } + case OPR_OR: { + luaK_goiffalse(fs, v); /* go ahead only if 'v' is false */ + break; + } + case OPR_CONCAT: { + luaK_exp2nextreg(fs, v); /* operand must be on the stack */ + break; + } + case OPR_ADD: case OPR_SUB: + case OPR_MUL: case OPR_DIV: case OPR_IDIV: + case OPR_MOD: case OPR_POW: + case OPR_BAND: case OPR_BOR: case OPR_BXOR: + case OPR_SHL: case OPR_SHR: { + if (!tonumeral(v, NULL)) + luaK_exp2anyreg(fs, v); + /* else keep numeral, which may be folded or used as an immediate + operand */ + break; + } + case OPR_EQ: case OPR_NE: { + if (!tonumeral(v, NULL)) + luaK_exp2RK(fs, v); + /* else keep numeral, which may be an immediate operand */ + break; + } + case OPR_LT: case OPR_LE: + case OPR_GT: case OPR_GE: { + int dummy, dummy2; + if (!isSCnumber(v, &dummy, &dummy2)) + luaK_exp2anyreg(fs, v); + /* else keep numeral, which may be an immediate operand */ + break; + } + default: lua_assert(0); + } +} + +/* +** Create code for '(e1 .. e2)'. +** For '(e1 .. e2.1 .. e2.2)' (which is '(e1 .. (e2.1 .. e2.2))', +** because concatenation is right associative), merge both CONCATs. +*/ +static void codeconcat (FuncState *fs, expdesc *e1, expdesc *e2, int line) { + Instruction *ie2 = previousinstruction(fs); + if (GET_OPCODE(*ie2) == OP_CONCAT) { /* is 'e2' a concatenation? */ + int n = GETARG_B(*ie2); /* # of elements concatenated in 'e2' */ + lua_assert(e1->u.info + 1 == GETARG_A(*ie2)); + freeexp(fs, e2); + SETARG_A(*ie2, e1->u.info); /* correct first element ('e1') */ + SETARG_B(*ie2, n + 1); /* will concatenate one more element */ + } + else { /* 'e2' is not a concatenation */ + luaK_codeABC(fs, OP_CONCAT, e1->u.info, 2, 0); /* new concat opcode */ + freeexp(fs, e2); + luaK_fixline(fs, line); + } +} + + +/* +** Finalize code for binary operation, after reading 2nd operand. +*/ +void luaK_posfix (FuncState *fs, BinOpr opr, + expdesc *e1, expdesc *e2, int line) { + luaK_dischargevars(fs, e2); + if (foldbinop(opr) && constfolding(fs, opr + LUA_OPADD, e1, e2)) + return; /* done by folding */ + switch (opr) { + case OPR_AND: { + lua_assert(e1->t == NO_JUMP); /* list closed by 'luaK_infix' */ + luaK_concat(fs, &e2->f, e1->f); + *e1 = *e2; + break; + } + case OPR_OR: { + lua_assert(e1->f == NO_JUMP); /* list closed by 'luaK_infix' */ + luaK_concat(fs, &e2->t, e1->t); + *e1 = *e2; + break; + } + case OPR_CONCAT: { /* e1 .. e2 */ + luaK_exp2nextreg(fs, e2); + codeconcat(fs, e1, e2, line); + break; + } + case OPR_ADD: case OPR_MUL: { + codecommutative(fs, opr, e1, e2, line); + break; + } + case OPR_SUB: { + if (finishbinexpneg(fs, e1, e2, OP_ADDI, line, TM_SUB)) + break; /* coded as (r1 + -I) */ + /* ELSE */ + } /* FALLTHROUGH */ + case OPR_DIV: case OPR_IDIV: case OPR_MOD: case OPR_POW: { + codearith(fs, opr, e1, e2, 0, line); + break; + } + case OPR_BAND: case OPR_BOR: case OPR_BXOR: { + codebitwise(fs, opr, e1, e2, line); + break; + } + case OPR_SHL: { + if (isSCint(e1)) { + swapexps(e1, e2); + codebini(fs, OP_SHLI, e1, e2, 1, line, TM_SHL); /* I << r2 */ + } + else if (finishbinexpneg(fs, e1, e2, OP_SHRI, line, TM_SHL)) { + /* coded as (r1 >> -I) */; + } + else /* regular case (two registers) */ + codebinexpval(fs, opr, e1, e2, line); + break; + } + case OPR_SHR: { + if (isSCint(e2)) + codebini(fs, OP_SHRI, e1, e2, 0, line, TM_SHR); /* r1 >> I */ + else /* regular case (two registers) */ + codebinexpval(fs, opr, e1, e2, line); + break; + } + case OPR_EQ: case OPR_NE: { + codeeq(fs, opr, e1, e2); + break; + } + case OPR_GT: case OPR_GE: { + /* '(a > b)' <=> '(b < a)'; '(a >= b)' <=> '(b <= a)' */ + swapexps(e1, e2); + opr = cast(BinOpr, (opr - OPR_GT) + OPR_LT); + } /* FALLTHROUGH */ + case OPR_LT: case OPR_LE: { + codeorder(fs, opr, e1, e2); + break; + } + default: lua_assert(0); + } +} + + +/* +** Change line information associated with current position, by removing +** previous info and adding it again with new line. +*/ +void luaK_fixline (FuncState *fs, int line) { + removelastlineinfo(fs); + savelineinfo(fs, fs->f, line); +} + + +void luaK_settablesize (FuncState *fs, int pc, int ra, int asize, int hsize) { + Instruction *inst = &fs->f->code[pc]; + int rb = (hsize != 0) ? luaO_ceillog2(hsize) + 1 : 0; /* hash size */ + int extra = asize / (MAXARG_C + 1); /* higher bits of array size */ + int rc = asize % (MAXARG_C + 1); /* lower bits of array size */ + int k = (extra > 0); /* true iff needs extra argument */ + *inst = CREATE_ABCk(OP_NEWTABLE, ra, rb, rc, k); + *(inst + 1) = CREATE_Ax(OP_EXTRAARG, extra); +} + + +/* +** Emit a SETLIST instruction. +** 'base' is register that keeps table; +** 'nelems' is #table plus those to be stored now; +** 'tostore' is number of values (in registers 'base + 1',...) to add to +** table (or LUA_MULTRET to add up to stack top). +*/ +void luaK_setlist (FuncState *fs, int base, int nelems, int tostore) { + lua_assert(tostore != 0 && tostore <= LFIELDS_PER_FLUSH); + if (tostore == LUA_MULTRET) + tostore = 0; + if (nelems <= MAXARG_C) + luaK_codeABC(fs, OP_SETLIST, base, tostore, nelems); + else { + int extra = nelems / (MAXARG_C + 1); + nelems %= (MAXARG_C + 1); + luaK_codeABCk(fs, OP_SETLIST, base, tostore, nelems, 1); + codeextraarg(fs, extra); + } + fs->freereg = base + 1; /* free registers with list values */ +} + + +/* +** return the final target of a jump (skipping jumps to jumps) +*/ +static int finaltarget (Instruction *code, int i) { + int count; + for (count = 0; count < 100; count++) { /* avoid infinite loops */ + Instruction pc = code[i]; + if (GET_OPCODE(pc) != OP_JMP) + break; + else + i += GETARG_sJ(pc) + 1; + } + return i; +} + + +/* +** Do a final pass over the code of a function, doing small peephole +** optimizations and adjustments. +*/ +void luaK_finish (FuncState *fs) { + int i; + Proto *p = fs->f; + for (i = 0; i < fs->pc; i++) { + Instruction *pc = &p->code[i]; + lua_assert(i == 0 || isOT(*(pc - 1)) == isIT(*pc)); + switch (GET_OPCODE(*pc)) { + case OP_RETURN0: case OP_RETURN1: { + if (!(fs->needclose || p->is_vararg)) + break; /* no extra work */ + /* else use OP_RETURN to do the extra work */ + SET_OPCODE(*pc, OP_RETURN); + } /* FALLTHROUGH */ + case OP_RETURN: case OP_TAILCALL: { + if (fs->needclose) + SETARG_k(*pc, 1); /* signal that it needs to close */ + if (p->is_vararg) + SETARG_C(*pc, p->numparams + 1); /* signal that it is vararg */ + break; + } + case OP_JMP: { + int target = finaltarget(p->code, i); + fixjump(fs, i, target); + break; + } + default: break; + } + } +} diff --git a/06/lua-5.4.6/src/lcode.h b/06/lua-5.4.6/src/lcode.h new file mode 100644 index 0000000..3265824 --- /dev/null +++ b/06/lua-5.4.6/src/lcode.h @@ -0,0 +1,104 @@ +/* +** $Id: lcode.h $ +** Code generator for Lua +** See Copyright Notice in lua.h +*/ + +#ifndef lcode_h +#define lcode_h + +#include "llex.h" +#include "lobject.h" +#include "lopcodes.h" +#include "lparser.h" + + +/* +** Marks the end of a patch list. It is an invalid value both as an absolute +** address, and as a list link (would link an element to itself). +*/ +#define NO_JUMP (-1) + + +/* +** grep "ORDER OPR" if you change these enums (ORDER OP) +*/ +typedef enum BinOpr { + /* arithmetic operators */ + OPR_ADD, OPR_SUB, OPR_MUL, OPR_MOD, OPR_POW, + OPR_DIV, OPR_IDIV, + /* bitwise operators */ + OPR_BAND, OPR_BOR, OPR_BXOR, + OPR_SHL, OPR_SHR, + /* string operator */ + OPR_CONCAT, + /* comparison operators */ + OPR_EQ, OPR_LT, OPR_LE, + OPR_NE, OPR_GT, OPR_GE, + /* logical operators */ + OPR_AND, OPR_OR, + OPR_NOBINOPR +} BinOpr; + + +/* true if operation is foldable (that is, it is arithmetic or bitwise) */ +#define foldbinop(op) ((op) <= OPR_SHR) + + +#define luaK_codeABC(fs,o,a,b,c) luaK_codeABCk(fs,o,a,b,c,0) + + +typedef enum UnOpr { OPR_MINUS, OPR_BNOT, OPR_NOT, OPR_LEN, OPR_NOUNOPR } UnOpr; + + +/* get (pointer to) instruction of given 'expdesc' */ +#define getinstruction(fs,e) ((fs)->f->code[(e)->u.info]) + + +#define luaK_setmultret(fs,e) luaK_setreturns(fs, e, LUA_MULTRET) + +#define luaK_jumpto(fs,t) luaK_patchlist(fs, luaK_jump(fs), t) + +LUAI_FUNC int luaK_code (FuncState *fs, Instruction i); +LUAI_FUNC int luaK_codeABx (FuncState *fs, OpCode o, int A, unsigned int Bx); +LUAI_FUNC int luaK_codeAsBx (FuncState *fs, OpCode o, int A, int Bx); +LUAI_FUNC int luaK_codeABCk (FuncState *fs, OpCode o, int A, + int B, int C, int k); +LUAI_FUNC int luaK_isKint (expdesc *e); +LUAI_FUNC int luaK_exp2const (FuncState *fs, const expdesc *e, TValue *v); +LUAI_FUNC void luaK_fixline (FuncState *fs, int line); +LUAI_FUNC void luaK_nil (FuncState *fs, int from, int n); +LUAI_FUNC void luaK_reserveregs (FuncState *fs, int n); +LUAI_FUNC void luaK_checkstack (FuncState *fs, int n); +LUAI_FUNC void luaK_int (FuncState *fs, int reg, lua_Integer n); +LUAI_FUNC void luaK_dischargevars (FuncState *fs, expdesc *e); +LUAI_FUNC int luaK_exp2anyreg (FuncState *fs, expdesc *e); +LUAI_FUNC void luaK_exp2anyregup (FuncState *fs, expdesc *e); +LUAI_FUNC void luaK_exp2nextreg (FuncState *fs, expdesc *e); +LUAI_FUNC void luaK_exp2val (FuncState *fs, expdesc *e); +LUAI_FUNC int luaK_exp2RK (FuncState *fs, expdesc *e); +LUAI_FUNC void luaK_self (FuncState *fs, expdesc *e, expdesc *key); +LUAI_FUNC void luaK_indexed (FuncState *fs, expdesc *t, expdesc *k); +LUAI_FUNC void luaK_goiftrue (FuncState *fs, expdesc *e); +LUAI_FUNC void luaK_goiffalse (FuncState *fs, expdesc *e); +LUAI_FUNC void luaK_storevar (FuncState *fs, expdesc *var, expdesc *e); +LUAI_FUNC void luaK_setreturns (FuncState *fs, expdesc *e, int nresults); +LUAI_FUNC void luaK_setoneret (FuncState *fs, expdesc *e); +LUAI_FUNC int luaK_jump (FuncState *fs); +LUAI_FUNC void luaK_ret (FuncState *fs, int first, int nret); +LUAI_FUNC void luaK_patchlist (FuncState *fs, int list, int target); +LUAI_FUNC void luaK_patchtohere (FuncState *fs, int list); +LUAI_FUNC void luaK_concat (FuncState *fs, int *l1, int l2); +LUAI_FUNC int luaK_getlabel (FuncState *fs); +LUAI_FUNC void luaK_prefix (FuncState *fs, UnOpr op, expdesc *v, int line); +LUAI_FUNC void luaK_infix (FuncState *fs, BinOpr op, expdesc *v); +LUAI_FUNC void luaK_posfix (FuncState *fs, BinOpr op, expdesc *v1, + expdesc *v2, int line); +LUAI_FUNC void luaK_settablesize (FuncState *fs, int pc, + int ra, int asize, int hsize); +LUAI_FUNC void luaK_setlist (FuncState *fs, int base, int nelems, int tostore); +LUAI_FUNC void luaK_finish (FuncState *fs); +LUAI_FUNC l_noret luaK_semerror (LexState *ls, const char *msg); + + +#endif diff --git a/06/lua-5.4.6/src/lcorolib.c b/06/lua-5.4.6/src/lcorolib.c new file mode 100644 index 0000000..c64adf0 --- /dev/null +++ b/06/lua-5.4.6/src/lcorolib.c @@ -0,0 +1,210 @@ +/* +** $Id: lcorolib.c $ +** Coroutine Library +** See Copyright Notice in lua.h +*/ + +#define lcorolib_c +#define LUA_LIB + +#include "lprefix.h" + + +#include + +#include "lua.h" + +#include "lauxlib.h" +#include "lualib.h" + + +static lua_State *getco (lua_State *L) { + lua_State *co = lua_tothread(L, 1); + luaL_argexpected(L, co, 1, "thread"); + return co; +} + + +/* +** Resumes a coroutine. Returns the number of results for non-error +** cases or -1 for errors. +*/ +static int auxresume (lua_State *L, lua_State *co, int narg) { + int status, nres; + if (l_unlikely(!lua_checkstack(co, narg))) { + lua_pushliteral(L, "too many arguments to resume"); + return -1; /* error flag */ + } + lua_xmove(L, co, narg); + status = lua_resume(co, L, narg, &nres); + if (l_likely(status == LUA_OK || status == LUA_YIELD)) { + if (l_unlikely(!lua_checkstack(L, nres + 1))) { + lua_pop(co, nres); /* remove results anyway */ + lua_pushliteral(L, "too many results to resume"); + return -1; /* error flag */ + } + lua_xmove(co, L, nres); /* move yielded values */ + return nres; + } + else { + lua_xmove(co, L, 1); /* move error message */ + return -1; /* error flag */ + } +} + + +static int luaB_coresume (lua_State *L) { + lua_State *co = getco(L); + int r; + r = auxresume(L, co, lua_gettop(L) - 1); + if (l_unlikely(r < 0)) { + lua_pushboolean(L, 0); + lua_insert(L, -2); + return 2; /* return false + error message */ + } + else { + lua_pushboolean(L, 1); + lua_insert(L, -(r + 1)); + return r + 1; /* return true + 'resume' returns */ + } +} + + +static int luaB_auxwrap (lua_State *L) { + lua_State *co = lua_tothread(L, lua_upvalueindex(1)); + int r = auxresume(L, co, lua_gettop(L)); + if (l_unlikely(r < 0)) { /* error? */ + int stat = lua_status(co); + if (stat != LUA_OK && stat != LUA_YIELD) { /* error in the coroutine? */ + stat = lua_closethread(co, L); /* close its tbc variables */ + lua_assert(stat != LUA_OK); + lua_xmove(co, L, 1); /* move error message to the caller */ + } + if (stat != LUA_ERRMEM && /* not a memory error and ... */ + lua_type(L, -1) == LUA_TSTRING) { /* ... error object is a string? */ + luaL_where(L, 1); /* add extra info, if available */ + lua_insert(L, -2); + lua_concat(L, 2); + } + return lua_error(L); /* propagate error */ + } + return r; +} + + +static int luaB_cocreate (lua_State *L) { + lua_State *NL; + luaL_checktype(L, 1, LUA_TFUNCTION); + NL = lua_newthread(L); + lua_pushvalue(L, 1); /* move function to top */ + lua_xmove(L, NL, 1); /* move function from L to NL */ + return 1; +} + + +static int luaB_cowrap (lua_State *L) { + luaB_cocreate(L); + lua_pushcclosure(L, luaB_auxwrap, 1); + return 1; +} + + +static int luaB_yield (lua_State *L) { + return lua_yield(L, lua_gettop(L)); +} + + +#define COS_RUN 0 +#define COS_DEAD 1 +#define COS_YIELD 2 +#define COS_NORM 3 + + +static const char *const statname[] = + {"running", "dead", "suspended", "normal"}; + + +static int auxstatus (lua_State *L, lua_State *co) { + if (L == co) return COS_RUN; + else { + switch (lua_status(co)) { + case LUA_YIELD: + return COS_YIELD; + case LUA_OK: { + lua_Debug ar; + if (lua_getstack(co, 0, &ar)) /* does it have frames? */ + return COS_NORM; /* it is running */ + else if (lua_gettop(co) == 0) + return COS_DEAD; + else + return COS_YIELD; /* initial state */ + } + default: /* some error occurred */ + return COS_DEAD; + } + } +} + + +static int luaB_costatus (lua_State *L) { + lua_State *co = getco(L); + lua_pushstring(L, statname[auxstatus(L, co)]); + return 1; +} + + +static int luaB_yieldable (lua_State *L) { + lua_State *co = lua_isnone(L, 1) ? L : getco(L); + lua_pushboolean(L, lua_isyieldable(co)); + return 1; +} + + +static int luaB_corunning (lua_State *L) { + int ismain = lua_pushthread(L); + lua_pushboolean(L, ismain); + return 2; +} + + +static int luaB_close (lua_State *L) { + lua_State *co = getco(L); + int status = auxstatus(L, co); + switch (status) { + case COS_DEAD: case COS_YIELD: { + status = lua_closethread(co, L); + if (status == LUA_OK) { + lua_pushboolean(L, 1); + return 1; + } + else { + lua_pushboolean(L, 0); + lua_xmove(co, L, 1); /* move error message */ + return 2; + } + } + default: /* normal or running coroutine */ + return luaL_error(L, "cannot close a %s coroutine", statname[status]); + } +} + + +static const luaL_Reg co_funcs[] = { + {"create", luaB_cocreate}, + {"resume", luaB_coresume}, + {"running", luaB_corunning}, + {"status", luaB_costatus}, + {"wrap", luaB_cowrap}, + {"yield", luaB_yield}, + {"isyieldable", luaB_yieldable}, + {"close", luaB_close}, + {NULL, NULL} +}; + + + +LUAMOD_API int luaopen_coroutine (lua_State *L) { + luaL_newlib(L, co_funcs); + return 1; +} + diff --git a/06/lua-5.4.6/src/lctype.c b/06/lua-5.4.6/src/lctype.c new file mode 100644 index 0000000..9542280 --- /dev/null +++ b/06/lua-5.4.6/src/lctype.c @@ -0,0 +1,64 @@ +/* +** $Id: lctype.c $ +** 'ctype' functions for Lua +** See Copyright Notice in lua.h +*/ + +#define lctype_c +#define LUA_CORE + +#include "lprefix.h" + + +#include "lctype.h" + +#if !LUA_USE_CTYPE /* { */ + +#include + + +#if defined (LUA_UCID) /* accept UniCode IDentifiers? */ +/* consider all non-ascii codepoints to be alphabetic */ +#define NONA 0x01 +#else +#define NONA 0x00 /* default */ +#endif + + +LUAI_DDEF const lu_byte luai_ctype_[UCHAR_MAX + 2] = { + 0x00, /* EOZ */ + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0. */ + 0x00, 0x08, 0x08, 0x08, 0x08, 0x08, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 1. */ + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x0c, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, /* 2. */ + 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, + 0x16, 0x16, 0x16, 0x16, 0x16, 0x16, 0x16, 0x16, /* 3. */ + 0x16, 0x16, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, + 0x04, 0x15, 0x15, 0x15, 0x15, 0x15, 0x15, 0x05, /* 4. */ + 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, + 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, /* 5. */ + 0x05, 0x05, 0x05, 0x04, 0x04, 0x04, 0x04, 0x05, + 0x04, 0x15, 0x15, 0x15, 0x15, 0x15, 0x15, 0x05, /* 6. */ + 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, + 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, /* 7. */ + 0x05, 0x05, 0x05, 0x04, 0x04, 0x04, 0x04, 0x00, + NONA, NONA, NONA, NONA, NONA, NONA, NONA, NONA, /* 8. */ + NONA, NONA, NONA, NONA, NONA, NONA, NONA, NONA, + NONA, NONA, NONA, NONA, NONA, NONA, NONA, NONA, /* 9. */ + NONA, NONA, NONA, NONA, NONA, NONA, NONA, NONA, + NONA, NONA, NONA, NONA, NONA, NONA, NONA, NONA, /* a. */ + NONA, NONA, NONA, NONA, NONA, NONA, NONA, NONA, + NONA, NONA, NONA, NONA, NONA, NONA, NONA, NONA, /* b. */ + NONA, NONA, NONA, NONA, NONA, NONA, NONA, NONA, + 0x00, 0x00, NONA, NONA, NONA, NONA, NONA, NONA, /* c. */ + NONA, NONA, NONA, NONA, NONA, NONA, NONA, NONA, + NONA, NONA, NONA, NONA, NONA, NONA, NONA, NONA, /* d. */ + NONA, NONA, NONA, NONA, NONA, NONA, NONA, NONA, + NONA, NONA, NONA, NONA, NONA, NONA, NONA, NONA, /* e. */ + NONA, NONA, NONA, NONA, NONA, NONA, NONA, NONA, + NONA, NONA, NONA, NONA, NONA, 0x00, 0x00, 0x00, /* f. */ + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 +}; + +#endif /* } */ diff --git a/06/lua-5.4.6/src/lctype.h b/06/lua-5.4.6/src/lctype.h new file mode 100644 index 0000000..864e190 --- /dev/null +++ b/06/lua-5.4.6/src/lctype.h @@ -0,0 +1,101 @@ +/* +** $Id: lctype.h $ +** 'ctype' functions for Lua +** See Copyright Notice in lua.h +*/ + +#ifndef lctype_h +#define lctype_h + +#include "lua.h" + + +/* +** WARNING: the functions defined here do not necessarily correspond +** to the similar functions in the standard C ctype.h. They are +** optimized for the specific needs of Lua. +*/ + +#if !defined(LUA_USE_CTYPE) + +#if 'A' == 65 && '0' == 48 +/* ASCII case: can use its own tables; faster and fixed */ +#define LUA_USE_CTYPE 0 +#else +/* must use standard C ctype */ +#define LUA_USE_CTYPE 1 +#endif + +#endif + + +#if !LUA_USE_CTYPE /* { */ + +#include + +#include "llimits.h" + + +#define ALPHABIT 0 +#define DIGITBIT 1 +#define PRINTBIT 2 +#define SPACEBIT 3 +#define XDIGITBIT 4 + + +#define MASK(B) (1 << (B)) + + +/* +** add 1 to char to allow index -1 (EOZ) +*/ +#define testprop(c,p) (luai_ctype_[(c)+1] & (p)) + +/* +** 'lalpha' (Lua alphabetic) and 'lalnum' (Lua alphanumeric) both include '_' +*/ +#define lislalpha(c) testprop(c, MASK(ALPHABIT)) +#define lislalnum(c) testprop(c, (MASK(ALPHABIT) | MASK(DIGITBIT))) +#define lisdigit(c) testprop(c, MASK(DIGITBIT)) +#define lisspace(c) testprop(c, MASK(SPACEBIT)) +#define lisprint(c) testprop(c, MASK(PRINTBIT)) +#define lisxdigit(c) testprop(c, MASK(XDIGITBIT)) + + +/* +** In ASCII, this 'ltolower' is correct for alphabetic characters and +** for '.'. That is enough for Lua needs. ('check_exp' ensures that +** the character either is an upper-case letter or is unchanged by +** the transformation, which holds for lower-case letters and '.'.) +*/ +#define ltolower(c) \ + check_exp(('A' <= (c) && (c) <= 'Z') || (c) == ((c) | ('A' ^ 'a')), \ + (c) | ('A' ^ 'a')) + + +/* one entry for each character and for -1 (EOZ) */ +LUAI_DDEC(const lu_byte luai_ctype_[UCHAR_MAX + 2];) + + +#else /* }{ */ + +/* +** use standard C ctypes +*/ + +#include + + +#define lislalpha(c) (isalpha(c) || (c) == '_') +#define lislalnum(c) (isalnum(c) || (c) == '_') +#define lisdigit(c) (isdigit(c)) +#define lisspace(c) (isspace(c)) +#define lisprint(c) (isprint(c)) +#define lisxdigit(c) (isxdigit(c)) + +#define ltolower(c) (tolower(c)) + +#endif /* } */ + +#endif + diff --git a/06/lua-5.4.6/src/ldblib.c b/06/lua-5.4.6/src/ldblib.c new file mode 100644 index 0000000..6dcbaa9 --- /dev/null +++ b/06/lua-5.4.6/src/ldblib.c @@ -0,0 +1,483 @@ +/* +** $Id: ldblib.c $ +** Interface from Lua to its debug API +** See Copyright Notice in lua.h +*/ + +#define ldblib_c +#define LUA_LIB + +#include "lprefix.h" + + +#include +#include +#include + +#include "lua.h" + +#include "lauxlib.h" +#include "lualib.h" + + +/* +** The hook table at registry[HOOKKEY] maps threads to their current +** hook function. +*/ +static const char *const HOOKKEY = "_HOOKKEY"; + + +/* +** If L1 != L, L1 can be in any state, and therefore there are no +** guarantees about its stack space; any push in L1 must be +** checked. +*/ +static void checkstack (lua_State *L, lua_State *L1, int n) { + if (l_unlikely(L != L1 && !lua_checkstack(L1, n))) + luaL_error(L, "stack overflow"); +} + + +static int db_getregistry (lua_State *L) { + lua_pushvalue(L, LUA_REGISTRYINDEX); + return 1; +} + + +static int db_getmetatable (lua_State *L) { + luaL_checkany(L, 1); + if (!lua_getmetatable(L, 1)) { + lua_pushnil(L); /* no metatable */ + } + return 1; +} + + +static int db_setmetatable (lua_State *L) { + int t = lua_type(L, 2); + luaL_argexpected(L, t == LUA_TNIL || t == LUA_TTABLE, 2, "nil or table"); + lua_settop(L, 2); + lua_setmetatable(L, 1); + return 1; /* return 1st argument */ +} + + +static int db_getuservalue (lua_State *L) { + int n = (int)luaL_optinteger(L, 2, 1); + if (lua_type(L, 1) != LUA_TUSERDATA) + luaL_pushfail(L); + else if (lua_getiuservalue(L, 1, n) != LUA_TNONE) { + lua_pushboolean(L, 1); + return 2; + } + return 1; +} + + +static int db_setuservalue (lua_State *L) { + int n = (int)luaL_optinteger(L, 3, 1); + luaL_checktype(L, 1, LUA_TUSERDATA); + luaL_checkany(L, 2); + lua_settop(L, 2); + if (!lua_setiuservalue(L, 1, n)) + luaL_pushfail(L); + return 1; +} + + +/* +** Auxiliary function used by several library functions: check for +** an optional thread as function's first argument and set 'arg' with +** 1 if this argument is present (so that functions can skip it to +** access their other arguments) +*/ +static lua_State *getthread (lua_State *L, int *arg) { + if (lua_isthread(L, 1)) { + *arg = 1; + return lua_tothread(L, 1); + } + else { + *arg = 0; + return L; /* function will operate over current thread */ + } +} + + +/* +** Variations of 'lua_settable', used by 'db_getinfo' to put results +** from 'lua_getinfo' into result table. Key is always a string; +** value can be a string, an int, or a boolean. +*/ +static void settabss (lua_State *L, const char *k, const char *v) { + lua_pushstring(L, v); + lua_setfield(L, -2, k); +} + +static void settabsi (lua_State *L, const char *k, int v) { + lua_pushinteger(L, v); + lua_setfield(L, -2, k); +} + +static void settabsb (lua_State *L, const char *k, int v) { + lua_pushboolean(L, v); + lua_setfield(L, -2, k); +} + + +/* +** In function 'db_getinfo', the call to 'lua_getinfo' may push +** results on the stack; later it creates the result table to put +** these objects. Function 'treatstackoption' puts the result from +** 'lua_getinfo' on top of the result table so that it can call +** 'lua_setfield'. +*/ +static void treatstackoption (lua_State *L, lua_State *L1, const char *fname) { + if (L == L1) + lua_rotate(L, -2, 1); /* exchange object and table */ + else + lua_xmove(L1, L, 1); /* move object to the "main" stack */ + lua_setfield(L, -2, fname); /* put object into table */ +} + + +/* +** Calls 'lua_getinfo' and collects all results in a new table. +** L1 needs stack space for an optional input (function) plus +** two optional outputs (function and line table) from function +** 'lua_getinfo'. +*/ +static int db_getinfo (lua_State *L) { + lua_Debug ar; + int arg; + lua_State *L1 = getthread(L, &arg); + const char *options = luaL_optstring(L, arg+2, "flnSrtu"); + checkstack(L, L1, 3); + luaL_argcheck(L, options[0] != '>', arg + 2, "invalid option '>'"); + if (lua_isfunction(L, arg + 1)) { /* info about a function? */ + options = lua_pushfstring(L, ">%s", options); /* add '>' to 'options' */ + lua_pushvalue(L, arg + 1); /* move function to 'L1' stack */ + lua_xmove(L, L1, 1); + } + else { /* stack level */ + if (!lua_getstack(L1, (int)luaL_checkinteger(L, arg + 1), &ar)) { + luaL_pushfail(L); /* level out of range */ + return 1; + } + } + if (!lua_getinfo(L1, options, &ar)) + return luaL_argerror(L, arg+2, "invalid option"); + lua_newtable(L); /* table to collect results */ + if (strchr(options, 'S')) { + lua_pushlstring(L, ar.source, ar.srclen); + lua_setfield(L, -2, "source"); + settabss(L, "short_src", ar.short_src); + settabsi(L, "linedefined", ar.linedefined); + settabsi(L, "lastlinedefined", ar.lastlinedefined); + settabss(L, "what", ar.what); + } + if (strchr(options, 'l')) + settabsi(L, "currentline", ar.currentline); + if (strchr(options, 'u')) { + settabsi(L, "nups", ar.nups); + settabsi(L, "nparams", ar.nparams); + settabsb(L, "isvararg", ar.isvararg); + } + if (strchr(options, 'n')) { + settabss(L, "name", ar.name); + settabss(L, "namewhat", ar.namewhat); + } + if (strchr(options, 'r')) { + settabsi(L, "ftransfer", ar.ftransfer); + settabsi(L, "ntransfer", ar.ntransfer); + } + if (strchr(options, 't')) + settabsb(L, "istailcall", ar.istailcall); + if (strchr(options, 'L')) + treatstackoption(L, L1, "activelines"); + if (strchr(options, 'f')) + treatstackoption(L, L1, "func"); + return 1; /* return table */ +} + + +static int db_getlocal (lua_State *L) { + int arg; + lua_State *L1 = getthread(L, &arg); + int nvar = (int)luaL_checkinteger(L, arg + 2); /* local-variable index */ + if (lua_isfunction(L, arg + 1)) { /* function argument? */ + lua_pushvalue(L, arg + 1); /* push function */ + lua_pushstring(L, lua_getlocal(L, NULL, nvar)); /* push local name */ + return 1; /* return only name (there is no value) */ + } + else { /* stack-level argument */ + lua_Debug ar; + const char *name; + int level = (int)luaL_checkinteger(L, arg + 1); + if (l_unlikely(!lua_getstack(L1, level, &ar))) /* out of range? */ + return luaL_argerror(L, arg+1, "level out of range"); + checkstack(L, L1, 1); + name = lua_getlocal(L1, &ar, nvar); + if (name) { + lua_xmove(L1, L, 1); /* move local value */ + lua_pushstring(L, name); /* push name */ + lua_rotate(L, -2, 1); /* re-order */ + return 2; + } + else { + luaL_pushfail(L); /* no name (nor value) */ + return 1; + } + } +} + + +static int db_setlocal (lua_State *L) { + int arg; + const char *name; + lua_State *L1 = getthread(L, &arg); + lua_Debug ar; + int level = (int)luaL_checkinteger(L, arg + 1); + int nvar = (int)luaL_checkinteger(L, arg + 2); + if (l_unlikely(!lua_getstack(L1, level, &ar))) /* out of range? */ + return luaL_argerror(L, arg+1, "level out of range"); + luaL_checkany(L, arg+3); + lua_settop(L, arg+3); + checkstack(L, L1, 1); + lua_xmove(L, L1, 1); + name = lua_setlocal(L1, &ar, nvar); + if (name == NULL) + lua_pop(L1, 1); /* pop value (if not popped by 'lua_setlocal') */ + lua_pushstring(L, name); + return 1; +} + + +/* +** get (if 'get' is true) or set an upvalue from a closure +*/ +static int auxupvalue (lua_State *L, int get) { + const char *name; + int n = (int)luaL_checkinteger(L, 2); /* upvalue index */ + luaL_checktype(L, 1, LUA_TFUNCTION); /* closure */ + name = get ? lua_getupvalue(L, 1, n) : lua_setupvalue(L, 1, n); + if (name == NULL) return 0; + lua_pushstring(L, name); + lua_insert(L, -(get+1)); /* no-op if get is false */ + return get + 1; +} + + +static int db_getupvalue (lua_State *L) { + return auxupvalue(L, 1); +} + + +static int db_setupvalue (lua_State *L) { + luaL_checkany(L, 3); + return auxupvalue(L, 0); +} + + +/* +** Check whether a given upvalue from a given closure exists and +** returns its index +*/ +static void *checkupval (lua_State *L, int argf, int argnup, int *pnup) { + void *id; + int nup = (int)luaL_checkinteger(L, argnup); /* upvalue index */ + luaL_checktype(L, argf, LUA_TFUNCTION); /* closure */ + id = lua_upvalueid(L, argf, nup); + if (pnup) { + luaL_argcheck(L, id != NULL, argnup, "invalid upvalue index"); + *pnup = nup; + } + return id; +} + + +static int db_upvalueid (lua_State *L) { + void *id = checkupval(L, 1, 2, NULL); + if (id != NULL) + lua_pushlightuserdata(L, id); + else + luaL_pushfail(L); + return 1; +} + + +static int db_upvaluejoin (lua_State *L) { + int n1, n2; + checkupval(L, 1, 2, &n1); + checkupval(L, 3, 4, &n2); + luaL_argcheck(L, !lua_iscfunction(L, 1), 1, "Lua function expected"); + luaL_argcheck(L, !lua_iscfunction(L, 3), 3, "Lua function expected"); + lua_upvaluejoin(L, 1, n1, 3, n2); + return 0; +} + + +/* +** Call hook function registered at hook table for the current +** thread (if there is one) +*/ +static void hookf (lua_State *L, lua_Debug *ar) { + static const char *const hooknames[] = + {"call", "return", "line", "count", "tail call"}; + lua_getfield(L, LUA_REGISTRYINDEX, HOOKKEY); + lua_pushthread(L); + if (lua_rawget(L, -2) == LUA_TFUNCTION) { /* is there a hook function? */ + lua_pushstring(L, hooknames[(int)ar->event]); /* push event name */ + if (ar->currentline >= 0) + lua_pushinteger(L, ar->currentline); /* push current line */ + else lua_pushnil(L); + lua_assert(lua_getinfo(L, "lS", ar)); + lua_call(L, 2, 0); /* call hook function */ + } +} + + +/* +** Convert a string mask (for 'sethook') into a bit mask +*/ +static int makemask (const char *smask, int count) { + int mask = 0; + if (strchr(smask, 'c')) mask |= LUA_MASKCALL; + if (strchr(smask, 'r')) mask |= LUA_MASKRET; + if (strchr(smask, 'l')) mask |= LUA_MASKLINE; + if (count > 0) mask |= LUA_MASKCOUNT; + return mask; +} + + +/* +** Convert a bit mask (for 'gethook') into a string mask +*/ +static char *unmakemask (int mask, char *smask) { + int i = 0; + if (mask & LUA_MASKCALL) smask[i++] = 'c'; + if (mask & LUA_MASKRET) smask[i++] = 'r'; + if (mask & LUA_MASKLINE) smask[i++] = 'l'; + smask[i] = '\0'; + return smask; +} + + +static int db_sethook (lua_State *L) { + int arg, mask, count; + lua_Hook func; + lua_State *L1 = getthread(L, &arg); + if (lua_isnoneornil(L, arg+1)) { /* no hook? */ + lua_settop(L, arg+1); + func = NULL; mask = 0; count = 0; /* turn off hooks */ + } + else { + const char *smask = luaL_checkstring(L, arg+2); + luaL_checktype(L, arg+1, LUA_TFUNCTION); + count = (int)luaL_optinteger(L, arg + 3, 0); + func = hookf; mask = makemask(smask, count); + } + if (!luaL_getsubtable(L, LUA_REGISTRYINDEX, HOOKKEY)) { + /* table just created; initialize it */ + lua_pushliteral(L, "k"); + lua_setfield(L, -2, "__mode"); /** hooktable.__mode = "k" */ + lua_pushvalue(L, -1); + lua_setmetatable(L, -2); /* metatable(hooktable) = hooktable */ + } + checkstack(L, L1, 1); + lua_pushthread(L1); lua_xmove(L1, L, 1); /* key (thread) */ + lua_pushvalue(L, arg + 1); /* value (hook function) */ + lua_rawset(L, -3); /* hooktable[L1] = new Lua hook */ + lua_sethook(L1, func, mask, count); + return 0; +} + + +static int db_gethook (lua_State *L) { + int arg; + lua_State *L1 = getthread(L, &arg); + char buff[5]; + int mask = lua_gethookmask(L1); + lua_Hook hook = lua_gethook(L1); + if (hook == NULL) { /* no hook? */ + luaL_pushfail(L); + return 1; + } + else if (hook != hookf) /* external hook? */ + lua_pushliteral(L, "external hook"); + else { /* hook table must exist */ + lua_getfield(L, LUA_REGISTRYINDEX, HOOKKEY); + checkstack(L, L1, 1); + lua_pushthread(L1); lua_xmove(L1, L, 1); + lua_rawget(L, -2); /* 1st result = hooktable[L1] */ + lua_remove(L, -2); /* remove hook table */ + } + lua_pushstring(L, unmakemask(mask, buff)); /* 2nd result = mask */ + lua_pushinteger(L, lua_gethookcount(L1)); /* 3rd result = count */ + return 3; +} + + +static int db_debug (lua_State *L) { + for (;;) { + char buffer[250]; + lua_writestringerror("%s", "lua_debug> "); + if (fgets(buffer, sizeof(buffer), stdin) == NULL || + strcmp(buffer, "cont\n") == 0) + return 0; + if (luaL_loadbuffer(L, buffer, strlen(buffer), "=(debug command)") || + lua_pcall(L, 0, 0, 0)) + lua_writestringerror("%s\n", luaL_tolstring(L, -1, NULL)); + lua_settop(L, 0); /* remove eventual returns */ + } +} + + +static int db_traceback (lua_State *L) { + int arg; + lua_State *L1 = getthread(L, &arg); + const char *msg = lua_tostring(L, arg + 1); + if (msg == NULL && !lua_isnoneornil(L, arg + 1)) /* non-string 'msg'? */ + lua_pushvalue(L, arg + 1); /* return it untouched */ + else { + int level = (int)luaL_optinteger(L, arg + 2, (L == L1) ? 1 : 0); + luaL_traceback(L, L1, msg, level); + } + return 1; +} + + +static int db_setcstacklimit (lua_State *L) { + int limit = (int)luaL_checkinteger(L, 1); + int res = lua_setcstacklimit(L, limit); + lua_pushinteger(L, res); + return 1; +} + + +static const luaL_Reg dblib[] = { + {"debug", db_debug}, + {"getuservalue", db_getuservalue}, + {"gethook", db_gethook}, + {"getinfo", db_getinfo}, + {"getlocal", db_getlocal}, + {"getregistry", db_getregistry}, + {"getmetatable", db_getmetatable}, + {"getupvalue", db_getupvalue}, + {"upvaluejoin", db_upvaluejoin}, + {"upvalueid", db_upvalueid}, + {"setuservalue", db_setuservalue}, + {"sethook", db_sethook}, + {"setlocal", db_setlocal}, + {"setmetatable", db_setmetatable}, + {"setupvalue", db_setupvalue}, + {"traceback", db_traceback}, + {"setcstacklimit", db_setcstacklimit}, + {NULL, NULL} +}; + + +LUAMOD_API int luaopen_debug (lua_State *L) { + luaL_newlib(L, dblib); + return 1; +} + diff --git a/06/lua-5.4.6/src/ldebug.c b/06/lua-5.4.6/src/ldebug.c new file mode 100644 index 0000000..28b1caa --- /dev/null +++ b/06/lua-5.4.6/src/ldebug.c @@ -0,0 +1,924 @@ +/* +** $Id: ldebug.c $ +** Debug Interface +** See Copyright Notice in lua.h +*/ + +#define ldebug_c +#define LUA_CORE + +#include "lprefix.h" + + +#include +#include +#include + +#include "lua.h" + +#include "lapi.h" +#include "lcode.h" +#include "ldebug.h" +#include "ldo.h" +#include "lfunc.h" +#include "lobject.h" +#include "lopcodes.h" +#include "lstate.h" +#include "lstring.h" +#include "ltable.h" +#include "ltm.h" +#include "lvm.h" + + + +#define noLuaClosure(f) ((f) == NULL || (f)->c.tt == LUA_VCCL) + + +static const char *funcnamefromcall (lua_State *L, CallInfo *ci, + const char **name); + + +static int currentpc (CallInfo *ci) { + lua_assert(isLua(ci)); + return pcRel(ci->u.l.savedpc, ci_func(ci)->p); +} + + +/* +** Get a "base line" to find the line corresponding to an instruction. +** Base lines are regularly placed at MAXIWTHABS intervals, so usually +** an integer division gets the right place. When the source file has +** large sequences of empty/comment lines, it may need extra entries, +** so the original estimate needs a correction. +** If the original estimate is -1, the initial 'if' ensures that the +** 'while' will run at least once. +** The assertion that the estimate is a lower bound for the correct base +** is valid as long as the debug info has been generated with the same +** value for MAXIWTHABS or smaller. (Previous releases use a little +** smaller value.) +*/ +static int getbaseline (const Proto *f, int pc, int *basepc) { + if (f->sizeabslineinfo == 0 || pc < f->abslineinfo[0].pc) { + *basepc = -1; /* start from the beginning */ + return f->linedefined; + } + else { + int i = cast_uint(pc) / MAXIWTHABS - 1; /* get an estimate */ + /* estimate must be a lower bound of the correct base */ + lua_assert(i < 0 || + (i < f->sizeabslineinfo && f->abslineinfo[i].pc <= pc)); + while (i + 1 < f->sizeabslineinfo && pc >= f->abslineinfo[i + 1].pc) + i++; /* low estimate; adjust it */ + *basepc = f->abslineinfo[i].pc; + return f->abslineinfo[i].line; + } +} + + +/* +** Get the line corresponding to instruction 'pc' in function 'f'; +** first gets a base line and from there does the increments until +** the desired instruction. +*/ +int luaG_getfuncline (const Proto *f, int pc) { + if (f->lineinfo == NULL) /* no debug information? */ + return -1; + else { + int basepc; + int baseline = getbaseline(f, pc, &basepc); + while (basepc++ < pc) { /* walk until given instruction */ + lua_assert(f->lineinfo[basepc] != ABSLINEINFO); + baseline += f->lineinfo[basepc]; /* correct line */ + } + return baseline; + } +} + + +static int getcurrentline (CallInfo *ci) { + return luaG_getfuncline(ci_func(ci)->p, currentpc(ci)); +} + + +/* +** Set 'trap' for all active Lua frames. +** This function can be called during a signal, under "reasonable" +** assumptions. A new 'ci' is completely linked in the list before it +** becomes part of the "active" list, and we assume that pointers are +** atomic; see comment in next function. +** (A compiler doing interprocedural optimizations could, theoretically, +** reorder memory writes in such a way that the list could be +** temporarily broken while inserting a new element. We simply assume it +** has no good reasons to do that.) +*/ +static void settraps (CallInfo *ci) { + for (; ci != NULL; ci = ci->previous) + if (isLua(ci)) + ci->u.l.trap = 1; +} + + +/* +** This function can be called during a signal, under "reasonable" +** assumptions. +** Fields 'basehookcount' and 'hookcount' (set by 'resethookcount') +** are for debug only, and it is no problem if they get arbitrary +** values (causes at most one wrong hook call). 'hookmask' is an atomic +** value. We assume that pointers are atomic too (e.g., gcc ensures that +** for all platforms where it runs). Moreover, 'hook' is always checked +** before being called (see 'luaD_hook'). +*/ +LUA_API void lua_sethook (lua_State *L, lua_Hook func, int mask, int count) { + if (func == NULL || mask == 0) { /* turn off hooks? */ + mask = 0; + func = NULL; + } + L->hook = func; + L->basehookcount = count; + resethookcount(L); + L->hookmask = cast_byte(mask); + if (mask) + settraps(L->ci); /* to trace inside 'luaV_execute' */ +} + + +LUA_API lua_Hook lua_gethook (lua_State *L) { + return L->hook; +} + + +LUA_API int lua_gethookmask (lua_State *L) { + return L->hookmask; +} + + +LUA_API int lua_gethookcount (lua_State *L) { + return L->basehookcount; +} + + +LUA_API int lua_getstack (lua_State *L, int level, lua_Debug *ar) { + int status; + CallInfo *ci; + if (level < 0) return 0; /* invalid (negative) level */ + lua_lock(L); + for (ci = L->ci; level > 0 && ci != &L->base_ci; ci = ci->previous) + level--; + if (level == 0 && ci != &L->base_ci) { /* level found? */ + status = 1; + ar->i_ci = ci; + } + else status = 0; /* no such level */ + lua_unlock(L); + return status; +} + + +static const char *upvalname (const Proto *p, int uv) { + TString *s = check_exp(uv < p->sizeupvalues, p->upvalues[uv].name); + if (s == NULL) return "?"; + else return getstr(s); +} + + +static const char *findvararg (CallInfo *ci, int n, StkId *pos) { + if (clLvalue(s2v(ci->func.p))->p->is_vararg) { + int nextra = ci->u.l.nextraargs; + if (n >= -nextra) { /* 'n' is negative */ + *pos = ci->func.p - nextra - (n + 1); + return "(vararg)"; /* generic name for any vararg */ + } + } + return NULL; /* no such vararg */ +} + + +const char *luaG_findlocal (lua_State *L, CallInfo *ci, int n, StkId *pos) { + StkId base = ci->func.p + 1; + const char *name = NULL; + if (isLua(ci)) { + if (n < 0) /* access to vararg values? */ + return findvararg(ci, n, pos); + else + name = luaF_getlocalname(ci_func(ci)->p, n, currentpc(ci)); + } + if (name == NULL) { /* no 'standard' name? */ + StkId limit = (ci == L->ci) ? L->top.p : ci->next->func.p; + if (limit - base >= n && n > 0) { /* is 'n' inside 'ci' stack? */ + /* generic name for any valid slot */ + name = isLua(ci) ? "(temporary)" : "(C temporary)"; + } + else + return NULL; /* no name */ + } + if (pos) + *pos = base + (n - 1); + return name; +} + + +LUA_API const char *lua_getlocal (lua_State *L, const lua_Debug *ar, int n) { + const char *name; + lua_lock(L); + if (ar == NULL) { /* information about non-active function? */ + if (!isLfunction(s2v(L->top.p - 1))) /* not a Lua function? */ + name = NULL; + else /* consider live variables at function start (parameters) */ + name = luaF_getlocalname(clLvalue(s2v(L->top.p - 1))->p, n, 0); + } + else { /* active function; get information through 'ar' */ + StkId pos = NULL; /* to avoid warnings */ + name = luaG_findlocal(L, ar->i_ci, n, &pos); + if (name) { + setobjs2s(L, L->top.p, pos); + api_incr_top(L); + } + } + lua_unlock(L); + return name; +} + + +LUA_API const char *lua_setlocal (lua_State *L, const lua_Debug *ar, int n) { + StkId pos = NULL; /* to avoid warnings */ + const char *name; + lua_lock(L); + name = luaG_findlocal(L, ar->i_ci, n, &pos); + if (name) { + setobjs2s(L, pos, L->top.p - 1); + L->top.p--; /* pop value */ + } + lua_unlock(L); + return name; +} + + +static void funcinfo (lua_Debug *ar, Closure *cl) { + if (noLuaClosure(cl)) { + ar->source = "=[C]"; + ar->srclen = LL("=[C]"); + ar->linedefined = -1; + ar->lastlinedefined = -1; + ar->what = "C"; + } + else { + const Proto *p = cl->l.p; + if (p->source) { + ar->source = getstr(p->source); + ar->srclen = tsslen(p->source); + } + else { + ar->source = "=?"; + ar->srclen = LL("=?"); + } + ar->linedefined = p->linedefined; + ar->lastlinedefined = p->lastlinedefined; + ar->what = (ar->linedefined == 0) ? "main" : "Lua"; + } + luaO_chunkid(ar->short_src, ar->source, ar->srclen); +} + + +static int nextline (const Proto *p, int currentline, int pc) { + if (p->lineinfo[pc] != ABSLINEINFO) + return currentline + p->lineinfo[pc]; + else + return luaG_getfuncline(p, pc); +} + + +static void collectvalidlines (lua_State *L, Closure *f) { + if (noLuaClosure(f)) { + setnilvalue(s2v(L->top.p)); + api_incr_top(L); + } + else { + int i; + TValue v; + const Proto *p = f->l.p; + int currentline = p->linedefined; + Table *t = luaH_new(L); /* new table to store active lines */ + sethvalue2s(L, L->top.p, t); /* push it on stack */ + api_incr_top(L); + setbtvalue(&v); /* boolean 'true' to be the value of all indices */ + if (!p->is_vararg) /* regular function? */ + i = 0; /* consider all instructions */ + else { /* vararg function */ + lua_assert(GET_OPCODE(p->code[0]) == OP_VARARGPREP); + currentline = nextline(p, currentline, 0); + i = 1; /* skip first instruction (OP_VARARGPREP) */ + } + for (; i < p->sizelineinfo; i++) { /* for each instruction */ + currentline = nextline(p, currentline, i); /* get its line */ + luaH_setint(L, t, currentline, &v); /* table[line] = true */ + } + } +} + + +static const char *getfuncname (lua_State *L, CallInfo *ci, const char **name) { + /* calling function is a known function? */ + if (ci != NULL && !(ci->callstatus & CIST_TAIL)) + return funcnamefromcall(L, ci->previous, name); + else return NULL; /* no way to find a name */ +} + + +static int auxgetinfo (lua_State *L, const char *what, lua_Debug *ar, + Closure *f, CallInfo *ci) { + int status = 1; + for (; *what; what++) { + switch (*what) { + case 'S': { + funcinfo(ar, f); + break; + } + case 'l': { + ar->currentline = (ci && isLua(ci)) ? getcurrentline(ci) : -1; + break; + } + case 'u': { + ar->nups = (f == NULL) ? 0 : f->c.nupvalues; + if (noLuaClosure(f)) { + ar->isvararg = 1; + ar->nparams = 0; + } + else { + ar->isvararg = f->l.p->is_vararg; + ar->nparams = f->l.p->numparams; + } + break; + } + case 't': { + ar->istailcall = (ci) ? ci->callstatus & CIST_TAIL : 0; + break; + } + case 'n': { + ar->namewhat = getfuncname(L, ci, &ar->name); + if (ar->namewhat == NULL) { + ar->namewhat = ""; /* not found */ + ar->name = NULL; + } + break; + } + case 'r': { + if (ci == NULL || !(ci->callstatus & CIST_TRAN)) + ar->ftransfer = ar->ntransfer = 0; + else { + ar->ftransfer = ci->u2.transferinfo.ftransfer; + ar->ntransfer = ci->u2.transferinfo.ntransfer; + } + break; + } + case 'L': + case 'f': /* handled by lua_getinfo */ + break; + default: status = 0; /* invalid option */ + } + } + return status; +} + + +LUA_API int lua_getinfo (lua_State *L, const char *what, lua_Debug *ar) { + int status; + Closure *cl; + CallInfo *ci; + TValue *func; + lua_lock(L); + if (*what == '>') { + ci = NULL; + func = s2v(L->top.p - 1); + api_check(L, ttisfunction(func), "function expected"); + what++; /* skip the '>' */ + L->top.p--; /* pop function */ + } + else { + ci = ar->i_ci; + func = s2v(ci->func.p); + lua_assert(ttisfunction(func)); + } + cl = ttisclosure(func) ? clvalue(func) : NULL; + status = auxgetinfo(L, what, ar, cl, ci); + if (strchr(what, 'f')) { + setobj2s(L, L->top.p, func); + api_incr_top(L); + } + if (strchr(what, 'L')) + collectvalidlines(L, cl); + lua_unlock(L); + return status; +} + + +/* +** {====================================================== +** Symbolic Execution +** ======================================================= +*/ + +static const char *getobjname (const Proto *p, int lastpc, int reg, + const char **name); + + +/* +** Find a "name" for the constant 'c'. +*/ +static void kname (const Proto *p, int c, const char **name) { + TValue *kvalue = &p->k[c]; + *name = (ttisstring(kvalue)) ? svalue(kvalue) : "?"; +} + + +/* +** Find a "name" for the register 'c'. +*/ +static void rname (const Proto *p, int pc, int c, const char **name) { + const char *what = getobjname(p, pc, c, name); /* search for 'c' */ + if (!(what && *what == 'c')) /* did not find a constant name? */ + *name = "?"; +} + + +/* +** Find a "name" for a 'C' value in an RK instruction. +*/ +static void rkname (const Proto *p, int pc, Instruction i, const char **name) { + int c = GETARG_C(i); /* key index */ + if (GETARG_k(i)) /* is 'c' a constant? */ + kname(p, c, name); + else /* 'c' is a register */ + rname(p, pc, c, name); +} + + +static int filterpc (int pc, int jmptarget) { + if (pc < jmptarget) /* is code conditional (inside a jump)? */ + return -1; /* cannot know who sets that register */ + else return pc; /* current position sets that register */ +} + + +/* +** Try to find last instruction before 'lastpc' that modified register 'reg'. +*/ +static int findsetreg (const Proto *p, int lastpc, int reg) { + int pc; + int setreg = -1; /* keep last instruction that changed 'reg' */ + int jmptarget = 0; /* any code before this address is conditional */ + if (testMMMode(GET_OPCODE(p->code[lastpc]))) + lastpc--; /* previous instruction was not actually executed */ + for (pc = 0; pc < lastpc; pc++) { + Instruction i = p->code[pc]; + OpCode op = GET_OPCODE(i); + int a = GETARG_A(i); + int change; /* true if current instruction changed 'reg' */ + switch (op) { + case OP_LOADNIL: { /* set registers from 'a' to 'a+b' */ + int b = GETARG_B(i); + change = (a <= reg && reg <= a + b); + break; + } + case OP_TFORCALL: { /* affect all regs above its base */ + change = (reg >= a + 2); + break; + } + case OP_CALL: + case OP_TAILCALL: { /* affect all registers above base */ + change = (reg >= a); + break; + } + case OP_JMP: { /* doesn't change registers, but changes 'jmptarget' */ + int b = GETARG_sJ(i); + int dest = pc + 1 + b; + /* jump does not skip 'lastpc' and is larger than current one? */ + if (dest <= lastpc && dest > jmptarget) + jmptarget = dest; /* update 'jmptarget' */ + change = 0; + break; + } + default: /* any instruction that sets A */ + change = (testAMode(op) && reg == a); + break; + } + if (change) + setreg = filterpc(pc, jmptarget); + } + return setreg; +} + + +/* +** Check whether table being indexed by instruction 'i' is the +** environment '_ENV' +*/ +static const char *gxf (const Proto *p, int pc, Instruction i, int isup) { + int t = GETARG_B(i); /* table index */ + const char *name; /* name of indexed variable */ + if (isup) /* is an upvalue? */ + name = upvalname(p, t); + else + getobjname(p, pc, t, &name); + return (name && strcmp(name, LUA_ENV) == 0) ? "global" : "field"; +} + + +static const char *getobjname (const Proto *p, int lastpc, int reg, + const char **name) { + int pc; + *name = luaF_getlocalname(p, reg + 1, lastpc); + if (*name) /* is a local? */ + return "local"; + /* else try symbolic execution */ + pc = findsetreg(p, lastpc, reg); + if (pc != -1) { /* could find instruction? */ + Instruction i = p->code[pc]; + OpCode op = GET_OPCODE(i); + switch (op) { + case OP_MOVE: { + int b = GETARG_B(i); /* move from 'b' to 'a' */ + if (b < GETARG_A(i)) + return getobjname(p, pc, b, name); /* get name for 'b' */ + break; + } + case OP_GETTABUP: { + int k = GETARG_C(i); /* key index */ + kname(p, k, name); + return gxf(p, pc, i, 1); + } + case OP_GETTABLE: { + int k = GETARG_C(i); /* key index */ + rname(p, pc, k, name); + return gxf(p, pc, i, 0); + } + case OP_GETI: { + *name = "integer index"; + return "field"; + } + case OP_GETFIELD: { + int k = GETARG_C(i); /* key index */ + kname(p, k, name); + return gxf(p, pc, i, 0); + } + case OP_GETUPVAL: { + *name = upvalname(p, GETARG_B(i)); + return "upvalue"; + } + case OP_LOADK: + case OP_LOADKX: { + int b = (op == OP_LOADK) ? GETARG_Bx(i) + : GETARG_Ax(p->code[pc + 1]); + if (ttisstring(&p->k[b])) { + *name = svalue(&p->k[b]); + return "constant"; + } + break; + } + case OP_SELF: { + rkname(p, pc, i, name); + return "method"; + } + default: break; /* go through to return NULL */ + } + } + return NULL; /* could not find reasonable name */ +} + + +/* +** Try to find a name for a function based on the code that called it. +** (Only works when function was called by a Lua function.) +** Returns what the name is (e.g., "for iterator", "method", +** "metamethod") and sets '*name' to point to the name. +*/ +static const char *funcnamefromcode (lua_State *L, const Proto *p, + int pc, const char **name) { + TMS tm = (TMS)0; /* (initial value avoids warnings) */ + Instruction i = p->code[pc]; /* calling instruction */ + switch (GET_OPCODE(i)) { + case OP_CALL: + case OP_TAILCALL: + return getobjname(p, pc, GETARG_A(i), name); /* get function name */ + case OP_TFORCALL: { /* for iterator */ + *name = "for iterator"; + return "for iterator"; + } + /* other instructions can do calls through metamethods */ + case OP_SELF: case OP_GETTABUP: case OP_GETTABLE: + case OP_GETI: case OP_GETFIELD: + tm = TM_INDEX; + break; + case OP_SETTABUP: case OP_SETTABLE: case OP_SETI: case OP_SETFIELD: + tm = TM_NEWINDEX; + break; + case OP_MMBIN: case OP_MMBINI: case OP_MMBINK: { + tm = cast(TMS, GETARG_C(i)); + break; + } + case OP_UNM: tm = TM_UNM; break; + case OP_BNOT: tm = TM_BNOT; break; + case OP_LEN: tm = TM_LEN; break; + case OP_CONCAT: tm = TM_CONCAT; break; + case OP_EQ: tm = TM_EQ; break; + /* no cases for OP_EQI and OP_EQK, as they don't call metamethods */ + case OP_LT: case OP_LTI: case OP_GTI: tm = TM_LT; break; + case OP_LE: case OP_LEI: case OP_GEI: tm = TM_LE; break; + case OP_CLOSE: case OP_RETURN: tm = TM_CLOSE; break; + default: + return NULL; /* cannot find a reasonable name */ + } + *name = getstr(G(L)->tmname[tm]) + 2; + return "metamethod"; +} + + +/* +** Try to find a name for a function based on how it was called. +*/ +static const char *funcnamefromcall (lua_State *L, CallInfo *ci, + const char **name) { + if (ci->callstatus & CIST_HOOKED) { /* was it called inside a hook? */ + *name = "?"; + return "hook"; + } + else if (ci->callstatus & CIST_FIN) { /* was it called as a finalizer? */ + *name = "__gc"; + return "metamethod"; /* report it as such */ + } + else if (isLua(ci)) + return funcnamefromcode(L, ci_func(ci)->p, currentpc(ci), name); + else + return NULL; +} + +/* }====================================================== */ + + + +/* +** Check whether pointer 'o' points to some value in the stack frame of +** the current function and, if so, returns its index. Because 'o' may +** not point to a value in this stack, we cannot compare it with the +** region boundaries (undefined behavior in ISO C). +*/ +static int instack (CallInfo *ci, const TValue *o) { + int pos; + StkId base = ci->func.p + 1; + for (pos = 0; base + pos < ci->top.p; pos++) { + if (o == s2v(base + pos)) + return pos; + } + return -1; /* not found */ +} + + +/* +** Checks whether value 'o' came from an upvalue. (That can only happen +** with instructions OP_GETTABUP/OP_SETTABUP, which operate directly on +** upvalues.) +*/ +static const char *getupvalname (CallInfo *ci, const TValue *o, + const char **name) { + LClosure *c = ci_func(ci); + int i; + for (i = 0; i < c->nupvalues; i++) { + if (c->upvals[i]->v.p == o) { + *name = upvalname(c->p, i); + return "upvalue"; + } + } + return NULL; +} + + +static const char *formatvarinfo (lua_State *L, const char *kind, + const char *name) { + if (kind == NULL) + return ""; /* no information */ + else + return luaO_pushfstring(L, " (%s '%s')", kind, name); +} + +/* +** Build a string with a "description" for the value 'o', such as +** "variable 'x'" or "upvalue 'y'". +*/ +static const char *varinfo (lua_State *L, const TValue *o) { + CallInfo *ci = L->ci; + const char *name = NULL; /* to avoid warnings */ + const char *kind = NULL; + if (isLua(ci)) { + kind = getupvalname(ci, o, &name); /* check whether 'o' is an upvalue */ + if (!kind) { /* not an upvalue? */ + int reg = instack(ci, o); /* try a register */ + if (reg >= 0) /* is 'o' a register? */ + kind = getobjname(ci_func(ci)->p, currentpc(ci), reg, &name); + } + } + return formatvarinfo(L, kind, name); +} + + +/* +** Raise a type error +*/ +static l_noret typeerror (lua_State *L, const TValue *o, const char *op, + const char *extra) { + const char *t = luaT_objtypename(L, o); + luaG_runerror(L, "attempt to %s a %s value%s", op, t, extra); +} + + +/* +** Raise a type error with "standard" information about the faulty +** object 'o' (using 'varinfo'). +*/ +l_noret luaG_typeerror (lua_State *L, const TValue *o, const char *op) { + typeerror(L, o, op, varinfo(L, o)); +} + + +/* +** Raise an error for calling a non-callable object. Try to find a name +** for the object based on how it was called ('funcnamefromcall'); if it +** cannot get a name there, try 'varinfo'. +*/ +l_noret luaG_callerror (lua_State *L, const TValue *o) { + CallInfo *ci = L->ci; + const char *name = NULL; /* to avoid warnings */ + const char *kind = funcnamefromcall(L, ci, &name); + const char *extra = kind ? formatvarinfo(L, kind, name) : varinfo(L, o); + typeerror(L, o, "call", extra); +} + + +l_noret luaG_forerror (lua_State *L, const TValue *o, const char *what) { + luaG_runerror(L, "bad 'for' %s (number expected, got %s)", + what, luaT_objtypename(L, o)); +} + + +l_noret luaG_concaterror (lua_State *L, const TValue *p1, const TValue *p2) { + if (ttisstring(p1) || cvt2str(p1)) p1 = p2; + luaG_typeerror(L, p1, "concatenate"); +} + + +l_noret luaG_opinterror (lua_State *L, const TValue *p1, + const TValue *p2, const char *msg) { + if (!ttisnumber(p1)) /* first operand is wrong? */ + p2 = p1; /* now second is wrong */ + luaG_typeerror(L, p2, msg); +} + + +/* +** Error when both values are convertible to numbers, but not to integers +*/ +l_noret luaG_tointerror (lua_State *L, const TValue *p1, const TValue *p2) { + lua_Integer temp; + if (!luaV_tointegerns(p1, &temp, LUA_FLOORN2I)) + p2 = p1; + luaG_runerror(L, "number%s has no integer representation", varinfo(L, p2)); +} + + +l_noret luaG_ordererror (lua_State *L, const TValue *p1, const TValue *p2) { + const char *t1 = luaT_objtypename(L, p1); + const char *t2 = luaT_objtypename(L, p2); + if (strcmp(t1, t2) == 0) + luaG_runerror(L, "attempt to compare two %s values", t1); + else + luaG_runerror(L, "attempt to compare %s with %s", t1, t2); +} + + +/* add src:line information to 'msg' */ +const char *luaG_addinfo (lua_State *L, const char *msg, TString *src, + int line) { + char buff[LUA_IDSIZE]; + if (src) + luaO_chunkid(buff, getstr(src), tsslen(src)); + else { /* no source available; use "?" instead */ + buff[0] = '?'; buff[1] = '\0'; + } + return luaO_pushfstring(L, "%s:%d: %s", buff, line, msg); +} + + +l_noret luaG_errormsg (lua_State *L) { + if (L->errfunc != 0) { /* is there an error handling function? */ + StkId errfunc = restorestack(L, L->errfunc); + lua_assert(ttisfunction(s2v(errfunc))); + setobjs2s(L, L->top.p, L->top.p - 1); /* move argument */ + setobjs2s(L, L->top.p - 1, errfunc); /* push function */ + L->top.p++; /* assume EXTRA_STACK */ + luaD_callnoyield(L, L->top.p - 2, 1); /* call it */ + } + luaD_throw(L, LUA_ERRRUN); +} + + +l_noret luaG_runerror (lua_State *L, const char *fmt, ...) { + CallInfo *ci = L->ci; + const char *msg; + va_list argp; + luaC_checkGC(L); /* error message uses memory */ + va_start(argp, fmt); + msg = luaO_pushvfstring(L, fmt, argp); /* format message */ + va_end(argp); + if (isLua(ci)) { /* if Lua function, add source:line information */ + luaG_addinfo(L, msg, ci_func(ci)->p->source, getcurrentline(ci)); + setobjs2s(L, L->top.p - 2, L->top.p - 1); /* remove 'msg' */ + L->top.p--; + } + luaG_errormsg(L); +} + + +/* +** Check whether new instruction 'newpc' is in a different line from +** previous instruction 'oldpc'. More often than not, 'newpc' is only +** one or a few instructions after 'oldpc' (it must be after, see +** caller), so try to avoid calling 'luaG_getfuncline'. If they are +** too far apart, there is a good chance of a ABSLINEINFO in the way, +** so it goes directly to 'luaG_getfuncline'. +*/ +static int changedline (const Proto *p, int oldpc, int newpc) { + if (p->lineinfo == NULL) /* no debug information? */ + return 0; + if (newpc - oldpc < MAXIWTHABS / 2) { /* not too far apart? */ + int delta = 0; /* line difference */ + int pc = oldpc; + for (;;) { + int lineinfo = p->lineinfo[++pc]; + if (lineinfo == ABSLINEINFO) + break; /* cannot compute delta; fall through */ + delta += lineinfo; + if (pc == newpc) + return (delta != 0); /* delta computed successfully */ + } + } + /* either instructions are too far apart or there is an absolute line + info in the way; compute line difference explicitly */ + return (luaG_getfuncline(p, oldpc) != luaG_getfuncline(p, newpc)); +} + + +/* +** Traces the execution of a Lua function. Called before the execution +** of each opcode, when debug is on. 'L->oldpc' stores the last +** instruction traced, to detect line changes. When entering a new +** function, 'npci' will be zero and will test as a new line whatever +** the value of 'oldpc'. Some exceptional conditions may return to +** a function without setting 'oldpc'. In that case, 'oldpc' may be +** invalid; if so, use zero as a valid value. (A wrong but valid 'oldpc' +** at most causes an extra call to a line hook.) +** This function is not "Protected" when called, so it should correct +** 'L->top.p' before calling anything that can run the GC. +*/ +int luaG_traceexec (lua_State *L, const Instruction *pc) { + CallInfo *ci = L->ci; + lu_byte mask = L->hookmask; + const Proto *p = ci_func(ci)->p; + int counthook; + if (!(mask & (LUA_MASKLINE | LUA_MASKCOUNT))) { /* no hooks? */ + ci->u.l.trap = 0; /* don't need to stop again */ + return 0; /* turn off 'trap' */ + } + pc++; /* reference is always next instruction */ + ci->u.l.savedpc = pc; /* save 'pc' */ + counthook = (--L->hookcount == 0 && (mask & LUA_MASKCOUNT)); + if (counthook) + resethookcount(L); /* reset count */ + else if (!(mask & LUA_MASKLINE)) + return 1; /* no line hook and count != 0; nothing to be done now */ + if (ci->callstatus & CIST_HOOKYIELD) { /* called hook last time? */ + ci->callstatus &= ~CIST_HOOKYIELD; /* erase mark */ + return 1; /* do not call hook again (VM yielded, so it did not move) */ + } + if (!isIT(*(ci->u.l.savedpc - 1))) /* top not being used? */ + L->top.p = ci->top.p; /* correct top */ + if (counthook) + luaD_hook(L, LUA_HOOKCOUNT, -1, 0, 0); /* call count hook */ + if (mask & LUA_MASKLINE) { + /* 'L->oldpc' may be invalid; use zero in this case */ + int oldpc = (L->oldpc < p->sizecode) ? L->oldpc : 0; + int npci = pcRel(pc, p); + if (npci <= oldpc || /* call hook when jump back (loop), */ + changedline(p, oldpc, npci)) { /* or when enter new line */ + int newline = luaG_getfuncline(p, npci); + luaD_hook(L, LUA_HOOKLINE, newline, 0, 0); /* call line hook */ + } + L->oldpc = npci; /* 'pc' of last call to line hook */ + } + if (L->status == LUA_YIELD) { /* did hook yield? */ + if (counthook) + L->hookcount = 1; /* undo decrement to zero */ + ci->u.l.savedpc--; /* undo increment (resume will increment it again) */ + ci->callstatus |= CIST_HOOKYIELD; /* mark that it yielded */ + luaD_throw(L, LUA_YIELD); + } + return 1; /* keep 'trap' on */ +} + diff --git a/06/lua-5.4.6/src/ldebug.h b/06/lua-5.4.6/src/ldebug.h new file mode 100644 index 0000000..2c3074c --- /dev/null +++ b/06/lua-5.4.6/src/ldebug.h @@ -0,0 +1,63 @@ +/* +** $Id: ldebug.h $ +** Auxiliary functions from Debug Interface module +** See Copyright Notice in lua.h +*/ + +#ifndef ldebug_h +#define ldebug_h + + +#include "lstate.h" + + +#define pcRel(pc, p) (cast_int((pc) - (p)->code) - 1) + + +/* Active Lua function (given call info) */ +#define ci_func(ci) (clLvalue(s2v((ci)->func.p))) + + +#define resethookcount(L) (L->hookcount = L->basehookcount) + +/* +** mark for entries in 'lineinfo' array that has absolute information in +** 'abslineinfo' array +*/ +#define ABSLINEINFO (-0x80) + + +/* +** MAXimum number of successive Instructions WiTHout ABSolute line +** information. (A power of two allows fast divisions.) +*/ +#if !defined(MAXIWTHABS) +#define MAXIWTHABS 128 +#endif + + +LUAI_FUNC int luaG_getfuncline (const Proto *f, int pc); +LUAI_FUNC const char *luaG_findlocal (lua_State *L, CallInfo *ci, int n, + StkId *pos); +LUAI_FUNC l_noret luaG_typeerror (lua_State *L, const TValue *o, + const char *opname); +LUAI_FUNC l_noret luaG_callerror (lua_State *L, const TValue *o); +LUAI_FUNC l_noret luaG_forerror (lua_State *L, const TValue *o, + const char *what); +LUAI_FUNC l_noret luaG_concaterror (lua_State *L, const TValue *p1, + const TValue *p2); +LUAI_FUNC l_noret luaG_opinterror (lua_State *L, const TValue *p1, + const TValue *p2, + const char *msg); +LUAI_FUNC l_noret luaG_tointerror (lua_State *L, const TValue *p1, + const TValue *p2); +LUAI_FUNC l_noret luaG_ordererror (lua_State *L, const TValue *p1, + const TValue *p2); +LUAI_FUNC l_noret luaG_runerror (lua_State *L, const char *fmt, ...); +LUAI_FUNC const char *luaG_addinfo (lua_State *L, const char *msg, + TString *src, int line); +LUAI_FUNC l_noret luaG_errormsg (lua_State *L); +LUAI_FUNC int luaG_traceexec (lua_State *L, const Instruction *pc); + + +#endif diff --git a/06/lua-5.4.6/src/ldo.c b/06/lua-5.4.6/src/ldo.c new file mode 100644 index 0000000..2a0017c --- /dev/null +++ b/06/lua-5.4.6/src/ldo.c @@ -0,0 +1,1024 @@ +/* +** $Id: ldo.c $ +** Stack and Call structure of Lua +** See Copyright Notice in lua.h +*/ + +#define ldo_c +#define LUA_CORE + +#include "lprefix.h" + + +#include +#include +#include + +#include "lua.h" + +#include "lapi.h" +#include "ldebug.h" +#include "ldo.h" +#include "lfunc.h" +#include "lgc.h" +#include "lmem.h" +#include "lobject.h" +#include "lopcodes.h" +#include "lparser.h" +#include "lstate.h" +#include "lstring.h" +#include "ltable.h" +#include "ltm.h" +#include "lundump.h" +#include "lvm.h" +#include "lzio.h" + + + +#define errorstatus(s) ((s) > LUA_YIELD) + + +/* +** {====================================================== +** Error-recovery functions +** ======================================================= +*/ + +/* +** LUAI_THROW/LUAI_TRY define how Lua does exception handling. By +** default, Lua handles errors with exceptions when compiling as +** C++ code, with _longjmp/_setjmp when asked to use them, and with +** longjmp/setjmp otherwise. +*/ +#if !defined(LUAI_THROW) /* { */ + +#if defined(__cplusplus) && !defined(LUA_USE_LONGJMP) /* { */ + +/* C++ exceptions */ +#define LUAI_THROW(L,c) throw(c) +#define LUAI_TRY(L,c,a) \ + try { a } catch(...) { if ((c)->status == 0) (c)->status = -1; } +#define luai_jmpbuf int /* dummy variable */ + +#elif defined(LUA_USE_POSIX) /* }{ */ + +/* in POSIX, try _longjmp/_setjmp (more efficient) */ +#define LUAI_THROW(L,c) _longjmp((c)->b, 1) +#define LUAI_TRY(L,c,a) if (_setjmp((c)->b) == 0) { a } +#define luai_jmpbuf jmp_buf + +#else /* }{ */ + +/* ISO C handling with long jumps */ +#define LUAI_THROW(L,c) longjmp((c)->b, 1) +#define LUAI_TRY(L,c,a) if (setjmp((c)->b) == 0) { a } +#define luai_jmpbuf jmp_buf + +#endif /* } */ + +#endif /* } */ + + + +/* chain list of long jump buffers */ +struct lua_longjmp { + struct lua_longjmp *previous; + luai_jmpbuf b; + volatile int status; /* error code */ +}; + + +void luaD_seterrorobj (lua_State *L, int errcode, StkId oldtop) { + switch (errcode) { + case LUA_ERRMEM: { /* memory error? */ + setsvalue2s(L, oldtop, G(L)->memerrmsg); /* reuse preregistered msg. */ + break; + } + case LUA_ERRERR: { + setsvalue2s(L, oldtop, luaS_newliteral(L, "error in error handling")); + break; + } + case LUA_OK: { /* special case only for closing upvalues */ + setnilvalue(s2v(oldtop)); /* no error message */ + break; + } + default: { + lua_assert(errorstatus(errcode)); /* real error */ + setobjs2s(L, oldtop, L->top.p - 1); /* error message on current top */ + break; + } + } + L->top.p = oldtop + 1; +} + + +l_noret luaD_throw (lua_State *L, int errcode) { + if (L->errorJmp) { /* thread has an error handler? */ + L->errorJmp->status = errcode; /* set status */ + LUAI_THROW(L, L->errorJmp); /* jump to it */ + } + else { /* thread has no error handler */ + global_State *g = G(L); + errcode = luaE_resetthread(L, errcode); /* close all upvalues */ + if (g->mainthread->errorJmp) { /* main thread has a handler? */ + setobjs2s(L, g->mainthread->top.p++, L->top.p - 1); /* copy error obj. */ + luaD_throw(g->mainthread, errcode); /* re-throw in main thread */ + } + else { /* no handler at all; abort */ + if (g->panic) { /* panic function? */ + lua_unlock(L); + g->panic(L); /* call panic function (last chance to jump out) */ + } + abort(); + } + } +} + + +int luaD_rawrunprotected (lua_State *L, Pfunc f, void *ud) { + l_uint32 oldnCcalls = L->nCcalls; + struct lua_longjmp lj; + lj.status = LUA_OK; + lj.previous = L->errorJmp; /* chain new error handler */ + L->errorJmp = &lj; + LUAI_TRY(L, &lj, + (*f)(L, ud); + ); + L->errorJmp = lj.previous; /* restore old error handler */ + L->nCcalls = oldnCcalls; + return lj.status; +} + +/* }====================================================== */ + + +/* +** {================================================================== +** Stack reallocation +** =================================================================== +*/ + + +/* +** Change all pointers to the stack into offsets. +*/ +static void relstack (lua_State *L) { + CallInfo *ci; + UpVal *up; + L->top.offset = savestack(L, L->top.p); + L->tbclist.offset = savestack(L, L->tbclist.p); + for (up = L->openupval; up != NULL; up = up->u.open.next) + up->v.offset = savestack(L, uplevel(up)); + for (ci = L->ci; ci != NULL; ci = ci->previous) { + ci->top.offset = savestack(L, ci->top.p); + ci->func.offset = savestack(L, ci->func.p); + } +} + + +/* +** Change back all offsets into pointers. +*/ +static void correctstack (lua_State *L) { + CallInfo *ci; + UpVal *up; + L->top.p = restorestack(L, L->top.offset); + L->tbclist.p = restorestack(L, L->tbclist.offset); + for (up = L->openupval; up != NULL; up = up->u.open.next) + up->v.p = s2v(restorestack(L, up->v.offset)); + for (ci = L->ci; ci != NULL; ci = ci->previous) { + ci->top.p = restorestack(L, ci->top.offset); + ci->func.p = restorestack(L, ci->func.offset); + if (isLua(ci)) + ci->u.l.trap = 1; /* signal to update 'trap' in 'luaV_execute' */ + } +} + + +/* some space for error handling */ +#define ERRORSTACKSIZE (LUAI_MAXSTACK + 200) + +/* +** Reallocate the stack to a new size, correcting all pointers into it. +** In ISO C, any pointer use after the pointer has been deallocated is +** undefined behavior. So, before the reallocation, all pointers are +** changed to offsets, and after the reallocation they are changed back +** to pointers. As during the reallocation the pointers are invalid, the +** reallocation cannot run emergency collections. +** +** In case of allocation error, raise an error or return false according +** to 'raiseerror'. +*/ +int luaD_reallocstack (lua_State *L, int newsize, int raiseerror) { + int oldsize = stacksize(L); + int i; + StkId newstack; + int oldgcstop = G(L)->gcstopem; + lua_assert(newsize <= LUAI_MAXSTACK || newsize == ERRORSTACKSIZE); + relstack(L); /* change pointers to offsets */ + G(L)->gcstopem = 1; /* stop emergency collection */ + newstack = luaM_reallocvector(L, L->stack.p, oldsize + EXTRA_STACK, + newsize + EXTRA_STACK, StackValue); + G(L)->gcstopem = oldgcstop; /* restore emergency collection */ + if (l_unlikely(newstack == NULL)) { /* reallocation failed? */ + correctstack(L); /* change offsets back to pointers */ + if (raiseerror) + luaM_error(L); + else return 0; /* do not raise an error */ + } + L->stack.p = newstack; + correctstack(L); /* change offsets back to pointers */ + L->stack_last.p = L->stack.p + newsize; + for (i = oldsize + EXTRA_STACK; i < newsize + EXTRA_STACK; i++) + setnilvalue(s2v(newstack + i)); /* erase new segment */ + return 1; +} + + +/* +** Try to grow the stack by at least 'n' elements. When 'raiseerror' +** is true, raises any error; otherwise, return 0 in case of errors. +*/ +int luaD_growstack (lua_State *L, int n, int raiseerror) { + int size = stacksize(L); + if (l_unlikely(size > LUAI_MAXSTACK)) { + /* if stack is larger than maximum, thread is already using the + extra space reserved for errors, that is, thread is handling + a stack error; cannot grow further than that. */ + lua_assert(stacksize(L) == ERRORSTACKSIZE); + if (raiseerror) + luaD_throw(L, LUA_ERRERR); /* error inside message handler */ + return 0; /* if not 'raiseerror', just signal it */ + } + else if (n < LUAI_MAXSTACK) { /* avoids arithmetic overflows */ + int newsize = 2 * size; /* tentative new size */ + int needed = cast_int(L->top.p - L->stack.p) + n; + if (newsize > LUAI_MAXSTACK) /* cannot cross the limit */ + newsize = LUAI_MAXSTACK; + if (newsize < needed) /* but must respect what was asked for */ + newsize = needed; + if (l_likely(newsize <= LUAI_MAXSTACK)) + return luaD_reallocstack(L, newsize, raiseerror); + } + /* else stack overflow */ + /* add extra size to be able to handle the error message */ + luaD_reallocstack(L, ERRORSTACKSIZE, raiseerror); + if (raiseerror) + luaG_runerror(L, "stack overflow"); + return 0; +} + + +/* +** Compute how much of the stack is being used, by computing the +** maximum top of all call frames in the stack and the current top. +*/ +static int stackinuse (lua_State *L) { + CallInfo *ci; + int res; + StkId lim = L->top.p; + for (ci = L->ci; ci != NULL; ci = ci->previous) { + if (lim < ci->top.p) lim = ci->top.p; + } + lua_assert(lim <= L->stack_last.p + EXTRA_STACK); + res = cast_int(lim - L->stack.p) + 1; /* part of stack in use */ + if (res < LUA_MINSTACK) + res = LUA_MINSTACK; /* ensure a minimum size */ + return res; +} + + +/* +** If stack size is more than 3 times the current use, reduce that size +** to twice the current use. (So, the final stack size is at most 2/3 the +** previous size, and half of its entries are empty.) +** As a particular case, if stack was handling a stack overflow and now +** it is not, 'max' (limited by LUAI_MAXSTACK) will be smaller than +** stacksize (equal to ERRORSTACKSIZE in this case), and so the stack +** will be reduced to a "regular" size. +*/ +void luaD_shrinkstack (lua_State *L) { + int inuse = stackinuse(L); + int max = (inuse > LUAI_MAXSTACK / 3) ? LUAI_MAXSTACK : inuse * 3; + /* if thread is currently not handling a stack overflow and its + size is larger than maximum "reasonable" size, shrink it */ + if (inuse <= LUAI_MAXSTACK && stacksize(L) > max) { + int nsize = (inuse > LUAI_MAXSTACK / 2) ? LUAI_MAXSTACK : inuse * 2; + luaD_reallocstack(L, nsize, 0); /* ok if that fails */ + } + else /* don't change stack */ + condmovestack(L,{},{}); /* (change only for debugging) */ + luaE_shrinkCI(L); /* shrink CI list */ +} + + +void luaD_inctop (lua_State *L) { + luaD_checkstack(L, 1); + L->top.p++; +} + +/* }================================================================== */ + + +/* +** Call a hook for the given event. Make sure there is a hook to be +** called. (Both 'L->hook' and 'L->hookmask', which trigger this +** function, can be changed asynchronously by signals.) +*/ +void luaD_hook (lua_State *L, int event, int line, + int ftransfer, int ntransfer) { + lua_Hook hook = L->hook; + if (hook && L->allowhook) { /* make sure there is a hook */ + int mask = CIST_HOOKED; + CallInfo *ci = L->ci; + ptrdiff_t top = savestack(L, L->top.p); /* preserve original 'top' */ + ptrdiff_t ci_top = savestack(L, ci->top.p); /* idem for 'ci->top' */ + lua_Debug ar; + ar.event = event; + ar.currentline = line; + ar.i_ci = ci; + if (ntransfer != 0) { + mask |= CIST_TRAN; /* 'ci' has transfer information */ + ci->u2.transferinfo.ftransfer = ftransfer; + ci->u2.transferinfo.ntransfer = ntransfer; + } + if (isLua(ci) && L->top.p < ci->top.p) + L->top.p = ci->top.p; /* protect entire activation register */ + luaD_checkstack(L, LUA_MINSTACK); /* ensure minimum stack size */ + if (ci->top.p < L->top.p + LUA_MINSTACK) + ci->top.p = L->top.p + LUA_MINSTACK; + L->allowhook = 0; /* cannot call hooks inside a hook */ + ci->callstatus |= mask; + lua_unlock(L); + (*hook)(L, &ar); + lua_lock(L); + lua_assert(!L->allowhook); + L->allowhook = 1; + ci->top.p = restorestack(L, ci_top); + L->top.p = restorestack(L, top); + ci->callstatus &= ~mask; + } +} + + +/* +** Executes a call hook for Lua functions. This function is called +** whenever 'hookmask' is not zero, so it checks whether call hooks are +** active. +*/ +void luaD_hookcall (lua_State *L, CallInfo *ci) { + L->oldpc = 0; /* set 'oldpc' for new function */ + if (L->hookmask & LUA_MASKCALL) { /* is call hook on? */ + int event = (ci->callstatus & CIST_TAIL) ? LUA_HOOKTAILCALL + : LUA_HOOKCALL; + Proto *p = ci_func(ci)->p; + ci->u.l.savedpc++; /* hooks assume 'pc' is already incremented */ + luaD_hook(L, event, -1, 1, p->numparams); + ci->u.l.savedpc--; /* correct 'pc' */ + } +} + + +/* +** Executes a return hook for Lua and C functions and sets/corrects +** 'oldpc'. (Note that this correction is needed by the line hook, so it +** is done even when return hooks are off.) +*/ +static void rethook (lua_State *L, CallInfo *ci, int nres) { + if (L->hookmask & LUA_MASKRET) { /* is return hook on? */ + StkId firstres = L->top.p - nres; /* index of first result */ + int delta = 0; /* correction for vararg functions */ + int ftransfer; + if (isLua(ci)) { + Proto *p = ci_func(ci)->p; + if (p->is_vararg) + delta = ci->u.l.nextraargs + p->numparams + 1; + } + ci->func.p += delta; /* if vararg, back to virtual 'func' */ + ftransfer = cast(unsigned short, firstres - ci->func.p); + luaD_hook(L, LUA_HOOKRET, -1, ftransfer, nres); /* call it */ + ci->func.p -= delta; + } + if (isLua(ci = ci->previous)) + L->oldpc = pcRel(ci->u.l.savedpc, ci_func(ci)->p); /* set 'oldpc' */ +} + + +/* +** Check whether 'func' has a '__call' metafield. If so, put it in the +** stack, below original 'func', so that 'luaD_precall' can call it. Raise +** an error if there is no '__call' metafield. +*/ +StkId luaD_tryfuncTM (lua_State *L, StkId func) { + const TValue *tm; + StkId p; + checkstackGCp(L, 1, func); /* space for metamethod */ + tm = luaT_gettmbyobj(L, s2v(func), TM_CALL); /* (after previous GC) */ + if (l_unlikely(ttisnil(tm))) + luaG_callerror(L, s2v(func)); /* nothing to call */ + for (p = L->top.p; p > func; p--) /* open space for metamethod */ + setobjs2s(L, p, p-1); + L->top.p++; /* stack space pre-allocated by the caller */ + setobj2s(L, func, tm); /* metamethod is the new function to be called */ + return func; +} + + +/* +** Given 'nres' results at 'firstResult', move 'wanted' of them to 'res'. +** Handle most typical cases (zero results for commands, one result for +** expressions, multiple results for tail calls/single parameters) +** separated. +*/ +l_sinline void moveresults (lua_State *L, StkId res, int nres, int wanted) { + StkId firstresult; + int i; + switch (wanted) { /* handle typical cases separately */ + case 0: /* no values needed */ + L->top.p = res; + return; + case 1: /* one value needed */ + if (nres == 0) /* no results? */ + setnilvalue(s2v(res)); /* adjust with nil */ + else /* at least one result */ + setobjs2s(L, res, L->top.p - nres); /* move it to proper place */ + L->top.p = res + 1; + return; + case LUA_MULTRET: + wanted = nres; /* we want all results */ + break; + default: /* two/more results and/or to-be-closed variables */ + if (hastocloseCfunc(wanted)) { /* to-be-closed variables? */ + L->ci->callstatus |= CIST_CLSRET; /* in case of yields */ + L->ci->u2.nres = nres; + res = luaF_close(L, res, CLOSEKTOP, 1); + L->ci->callstatus &= ~CIST_CLSRET; + if (L->hookmask) { /* if needed, call hook after '__close's */ + ptrdiff_t savedres = savestack(L, res); + rethook(L, L->ci, nres); + res = restorestack(L, savedres); /* hook can move stack */ + } + wanted = decodeNresults(wanted); + if (wanted == LUA_MULTRET) + wanted = nres; /* we want all results */ + } + break; + } + /* generic case */ + firstresult = L->top.p - nres; /* index of first result */ + if (nres > wanted) /* extra results? */ + nres = wanted; /* don't need them */ + for (i = 0; i < nres; i++) /* move all results to correct place */ + setobjs2s(L, res + i, firstresult + i); + for (; i < wanted; i++) /* complete wanted number of results */ + setnilvalue(s2v(res + i)); + L->top.p = res + wanted; /* top points after the last result */ +} + + +/* +** Finishes a function call: calls hook if necessary, moves current +** number of results to proper place, and returns to previous call +** info. If function has to close variables, hook must be called after +** that. +*/ +void luaD_poscall (lua_State *L, CallInfo *ci, int nres) { + int wanted = ci->nresults; + if (l_unlikely(L->hookmask && !hastocloseCfunc(wanted))) + rethook(L, ci, nres); + /* move results to proper place */ + moveresults(L, ci->func.p, nres, wanted); + /* function cannot be in any of these cases when returning */ + lua_assert(!(ci->callstatus & + (CIST_HOOKED | CIST_YPCALL | CIST_FIN | CIST_TRAN | CIST_CLSRET))); + L->ci = ci->previous; /* back to caller (after closing variables) */ +} + + + +#define next_ci(L) (L->ci->next ? L->ci->next : luaE_extendCI(L)) + + +l_sinline CallInfo *prepCallInfo (lua_State *L, StkId func, int nret, + int mask, StkId top) { + CallInfo *ci = L->ci = next_ci(L); /* new frame */ + ci->func.p = func; + ci->nresults = nret; + ci->callstatus = mask; + ci->top.p = top; + return ci; +} + + +/* +** precall for C functions +*/ +l_sinline int precallC (lua_State *L, StkId func, int nresults, + lua_CFunction f) { + int n; /* number of returns */ + CallInfo *ci; + checkstackGCp(L, LUA_MINSTACK, func); /* ensure minimum stack size */ + L->ci = ci = prepCallInfo(L, func, nresults, CIST_C, + L->top.p + LUA_MINSTACK); + lua_assert(ci->top.p <= L->stack_last.p); + if (l_unlikely(L->hookmask & LUA_MASKCALL)) { + int narg = cast_int(L->top.p - func) - 1; + luaD_hook(L, LUA_HOOKCALL, -1, 1, narg); + } + lua_unlock(L); + n = (*f)(L); /* do the actual call */ + lua_lock(L); + api_checknelems(L, n); + luaD_poscall(L, ci, n); + return n; +} + + +/* +** Prepare a function for a tail call, building its call info on top +** of the current call info. 'narg1' is the number of arguments plus 1 +** (so that it includes the function itself). Return the number of +** results, if it was a C function, or -1 for a Lua function. +*/ +int luaD_pretailcall (lua_State *L, CallInfo *ci, StkId func, + int narg1, int delta) { + retry: + switch (ttypetag(s2v(func))) { + case LUA_VCCL: /* C closure */ + return precallC(L, func, LUA_MULTRET, clCvalue(s2v(func))->f); + case LUA_VLCF: /* light C function */ + return precallC(L, func, LUA_MULTRET, fvalue(s2v(func))); + case LUA_VLCL: { /* Lua function */ + Proto *p = clLvalue(s2v(func))->p; + int fsize = p->maxstacksize; /* frame size */ + int nfixparams = p->numparams; + int i; + checkstackGCp(L, fsize - delta, func); + ci->func.p -= delta; /* restore 'func' (if vararg) */ + for (i = 0; i < narg1; i++) /* move down function and arguments */ + setobjs2s(L, ci->func.p + i, func + i); + func = ci->func.p; /* moved-down function */ + for (; narg1 <= nfixparams; narg1++) + setnilvalue(s2v(func + narg1)); /* complete missing arguments */ + ci->top.p = func + 1 + fsize; /* top for new function */ + lua_assert(ci->top.p <= L->stack_last.p); + ci->u.l.savedpc = p->code; /* starting point */ + ci->callstatus |= CIST_TAIL; + L->top.p = func + narg1; /* set top */ + return -1; + } + default: { /* not a function */ + func = luaD_tryfuncTM(L, func); /* try to get '__call' metamethod */ + /* return luaD_pretailcall(L, ci, func, narg1 + 1, delta); */ + narg1++; + goto retry; /* try again */ + } + } +} + + +/* +** Prepares the call to a function (C or Lua). For C functions, also do +** the call. The function to be called is at '*func'. The arguments +** are on the stack, right after the function. Returns the CallInfo +** to be executed, if it was a Lua function. Otherwise (a C function) +** returns NULL, with all the results on the stack, starting at the +** original function position. +*/ +CallInfo *luaD_precall (lua_State *L, StkId func, int nresults) { + retry: + switch (ttypetag(s2v(func))) { + case LUA_VCCL: /* C closure */ + precallC(L, func, nresults, clCvalue(s2v(func))->f); + return NULL; + case LUA_VLCF: /* light C function */ + precallC(L, func, nresults, fvalue(s2v(func))); + return NULL; + case LUA_VLCL: { /* Lua function */ + CallInfo *ci; + Proto *p = clLvalue(s2v(func))->p; + int narg = cast_int(L->top.p - func) - 1; /* number of real arguments */ + int nfixparams = p->numparams; + int fsize = p->maxstacksize; /* frame size */ + checkstackGCp(L, fsize, func); + L->ci = ci = prepCallInfo(L, func, nresults, 0, func + 1 + fsize); + ci->u.l.savedpc = p->code; /* starting point */ + for (; narg < nfixparams; narg++) + setnilvalue(s2v(L->top.p++)); /* complete missing arguments */ + lua_assert(ci->top.p <= L->stack_last.p); + return ci; + } + default: { /* not a function */ + func = luaD_tryfuncTM(L, func); /* try to get '__call' metamethod */ + /* return luaD_precall(L, func, nresults); */ + goto retry; /* try again with metamethod */ + } + } +} + + +/* +** Call a function (C or Lua) through C. 'inc' can be 1 (increment +** number of recursive invocations in the C stack) or nyci (the same +** plus increment number of non-yieldable calls). +** This function can be called with some use of EXTRA_STACK, so it should +** check the stack before doing anything else. 'luaD_precall' already +** does that. +*/ +l_sinline void ccall (lua_State *L, StkId func, int nResults, l_uint32 inc) { + CallInfo *ci; + L->nCcalls += inc; + if (l_unlikely(getCcalls(L) >= LUAI_MAXCCALLS)) { + checkstackp(L, 0, func); /* free any use of EXTRA_STACK */ + luaE_checkcstack(L); + } + if ((ci = luaD_precall(L, func, nResults)) != NULL) { /* Lua function? */ + ci->callstatus = CIST_FRESH; /* mark that it is a "fresh" execute */ + luaV_execute(L, ci); /* call it */ + } + L->nCcalls -= inc; +} + + +/* +** External interface for 'ccall' +*/ +void luaD_call (lua_State *L, StkId func, int nResults) { + ccall(L, func, nResults, 1); +} + + +/* +** Similar to 'luaD_call', but does not allow yields during the call. +*/ +void luaD_callnoyield (lua_State *L, StkId func, int nResults) { + ccall(L, func, nResults, nyci); +} + + +/* +** Finish the job of 'lua_pcallk' after it was interrupted by an yield. +** (The caller, 'finishCcall', does the final call to 'adjustresults'.) +** The main job is to complete the 'luaD_pcall' called by 'lua_pcallk'. +** If a '__close' method yields here, eventually control will be back +** to 'finishCcall' (when that '__close' method finally returns) and +** 'finishpcallk' will run again and close any still pending '__close' +** methods. Similarly, if a '__close' method errs, 'precover' calls +** 'unroll' which calls ''finishCcall' and we are back here again, to +** close any pending '__close' methods. +** Note that, up to the call to 'luaF_close', the corresponding +** 'CallInfo' is not modified, so that this repeated run works like the +** first one (except that it has at least one less '__close' to do). In +** particular, field CIST_RECST preserves the error status across these +** multiple runs, changing only if there is a new error. +*/ +static int finishpcallk (lua_State *L, CallInfo *ci) { + int status = getcistrecst(ci); /* get original status */ + if (l_likely(status == LUA_OK)) /* no error? */ + status = LUA_YIELD; /* was interrupted by an yield */ + else { /* error */ + StkId func = restorestack(L, ci->u2.funcidx); + L->allowhook = getoah(ci->callstatus); /* restore 'allowhook' */ + func = luaF_close(L, func, status, 1); /* can yield or raise an error */ + luaD_seterrorobj(L, status, func); + luaD_shrinkstack(L); /* restore stack size in case of overflow */ + setcistrecst(ci, LUA_OK); /* clear original status */ + } + ci->callstatus &= ~CIST_YPCALL; + L->errfunc = ci->u.c.old_errfunc; + /* if it is here, there were errors or yields; unlike 'lua_pcallk', + do not change status */ + return status; +} + + +/* +** Completes the execution of a C function interrupted by an yield. +** The interruption must have happened while the function was either +** closing its tbc variables in 'moveresults' or executing +** 'lua_callk'/'lua_pcallk'. In the first case, it just redoes +** 'luaD_poscall'. In the second case, the call to 'finishpcallk' +** finishes the interrupted execution of 'lua_pcallk'. After that, it +** calls the continuation of the interrupted function and finally it +** completes the job of the 'luaD_call' that called the function. In +** the call to 'adjustresults', we do not know the number of results +** of the function called by 'lua_callk'/'lua_pcallk', so we are +** conservative and use LUA_MULTRET (always adjust). +*/ +static void finishCcall (lua_State *L, CallInfo *ci) { + int n; /* actual number of results from C function */ + if (ci->callstatus & CIST_CLSRET) { /* was returning? */ + lua_assert(hastocloseCfunc(ci->nresults)); + n = ci->u2.nres; /* just redo 'luaD_poscall' */ + /* don't need to reset CIST_CLSRET, as it will be set again anyway */ + } + else { + int status = LUA_YIELD; /* default if there were no errors */ + /* must have a continuation and must be able to call it */ + lua_assert(ci->u.c.k != NULL && yieldable(L)); + if (ci->callstatus & CIST_YPCALL) /* was inside a 'lua_pcallk'? */ + status = finishpcallk(L, ci); /* finish it */ + adjustresults(L, LUA_MULTRET); /* finish 'lua_callk' */ + lua_unlock(L); + n = (*ci->u.c.k)(L, status, ci->u.c.ctx); /* call continuation */ + lua_lock(L); + api_checknelems(L, n); + } + luaD_poscall(L, ci, n); /* finish 'luaD_call' */ +} + + +/* +** Executes "full continuation" (everything in the stack) of a +** previously interrupted coroutine until the stack is empty (or another +** interruption long-jumps out of the loop). +*/ +static void unroll (lua_State *L, void *ud) { + CallInfo *ci; + UNUSED(ud); + while ((ci = L->ci) != &L->base_ci) { /* something in the stack */ + if (!isLua(ci)) /* C function? */ + finishCcall(L, ci); /* complete its execution */ + else { /* Lua function */ + luaV_finishOp(L); /* finish interrupted instruction */ + luaV_execute(L, ci); /* execute down to higher C 'boundary' */ + } + } +} + + +/* +** Try to find a suspended protected call (a "recover point") for the +** given thread. +*/ +static CallInfo *findpcall (lua_State *L) { + CallInfo *ci; + for (ci = L->ci; ci != NULL; ci = ci->previous) { /* search for a pcall */ + if (ci->callstatus & CIST_YPCALL) + return ci; + } + return NULL; /* no pending pcall */ +} + + +/* +** Signal an error in the call to 'lua_resume', not in the execution +** of the coroutine itself. (Such errors should not be handled by any +** coroutine error handler and should not kill the coroutine.) +*/ +static int resume_error (lua_State *L, const char *msg, int narg) { + L->top.p -= narg; /* remove args from the stack */ + setsvalue2s(L, L->top.p, luaS_new(L, msg)); /* push error message */ + api_incr_top(L); + lua_unlock(L); + return LUA_ERRRUN; +} + + +/* +** Do the work for 'lua_resume' in protected mode. Most of the work +** depends on the status of the coroutine: initial state, suspended +** inside a hook, or regularly suspended (optionally with a continuation +** function), plus erroneous cases: non-suspended coroutine or dead +** coroutine. +*/ +static void resume (lua_State *L, void *ud) { + int n = *(cast(int*, ud)); /* number of arguments */ + StkId firstArg = L->top.p - n; /* first argument */ + CallInfo *ci = L->ci; + if (L->status == LUA_OK) /* starting a coroutine? */ + ccall(L, firstArg - 1, LUA_MULTRET, 0); /* just call its body */ + else { /* resuming from previous yield */ + lua_assert(L->status == LUA_YIELD); + L->status = LUA_OK; /* mark that it is running (again) */ + if (isLua(ci)) { /* yielded inside a hook? */ + L->top.p = firstArg; /* discard arguments */ + luaV_execute(L, ci); /* just continue running Lua code */ + } + else { /* 'common' yield */ + if (ci->u.c.k != NULL) { /* does it have a continuation function? */ + lua_unlock(L); + n = (*ci->u.c.k)(L, LUA_YIELD, ci->u.c.ctx); /* call continuation */ + lua_lock(L); + api_checknelems(L, n); + } + luaD_poscall(L, ci, n); /* finish 'luaD_call' */ + } + unroll(L, NULL); /* run continuation */ + } +} + + +/* +** Unrolls a coroutine in protected mode while there are recoverable +** errors, that is, errors inside a protected call. (Any error +** interrupts 'unroll', and this loop protects it again so it can +** continue.) Stops with a normal end (status == LUA_OK), an yield +** (status == LUA_YIELD), or an unprotected error ('findpcall' doesn't +** find a recover point). +*/ +static int precover (lua_State *L, int status) { + CallInfo *ci; + while (errorstatus(status) && (ci = findpcall(L)) != NULL) { + L->ci = ci; /* go down to recovery functions */ + setcistrecst(ci, status); /* status to finish 'pcall' */ + status = luaD_rawrunprotected(L, unroll, NULL); + } + return status; +} + + +LUA_API int lua_resume (lua_State *L, lua_State *from, int nargs, + int *nresults) { + int status; + lua_lock(L); + if (L->status == LUA_OK) { /* may be starting a coroutine */ + if (L->ci != &L->base_ci) /* not in base level? */ + return resume_error(L, "cannot resume non-suspended coroutine", nargs); + else if (L->top.p - (L->ci->func.p + 1) == nargs) /* no function? */ + return resume_error(L, "cannot resume dead coroutine", nargs); + } + else if (L->status != LUA_YIELD) /* ended with errors? */ + return resume_error(L, "cannot resume dead coroutine", nargs); + L->nCcalls = (from) ? getCcalls(from) : 0; + if (getCcalls(L) >= LUAI_MAXCCALLS) + return resume_error(L, "C stack overflow", nargs); + L->nCcalls++; + luai_userstateresume(L, nargs); + api_checknelems(L, (L->status == LUA_OK) ? nargs + 1 : nargs); + status = luaD_rawrunprotected(L, resume, &nargs); + /* continue running after recoverable errors */ + status = precover(L, status); + if (l_likely(!errorstatus(status))) + lua_assert(status == L->status); /* normal end or yield */ + else { /* unrecoverable error */ + L->status = cast_byte(status); /* mark thread as 'dead' */ + luaD_seterrorobj(L, status, L->top.p); /* push error message */ + L->ci->top.p = L->top.p; + } + *nresults = (status == LUA_YIELD) ? L->ci->u2.nyield + : cast_int(L->top.p - (L->ci->func.p + 1)); + lua_unlock(L); + return status; +} + + +LUA_API int lua_isyieldable (lua_State *L) { + return yieldable(L); +} + + +LUA_API int lua_yieldk (lua_State *L, int nresults, lua_KContext ctx, + lua_KFunction k) { + CallInfo *ci; + luai_userstateyield(L, nresults); + lua_lock(L); + ci = L->ci; + api_checknelems(L, nresults); + if (l_unlikely(!yieldable(L))) { + if (L != G(L)->mainthread) + luaG_runerror(L, "attempt to yield across a C-call boundary"); + else + luaG_runerror(L, "attempt to yield from outside a coroutine"); + } + L->status = LUA_YIELD; + ci->u2.nyield = nresults; /* save number of results */ + if (isLua(ci)) { /* inside a hook? */ + lua_assert(!isLuacode(ci)); + api_check(L, nresults == 0, "hooks cannot yield values"); + api_check(L, k == NULL, "hooks cannot continue after yielding"); + } + else { + if ((ci->u.c.k = k) != NULL) /* is there a continuation? */ + ci->u.c.ctx = ctx; /* save context */ + luaD_throw(L, LUA_YIELD); + } + lua_assert(ci->callstatus & CIST_HOOKED); /* must be inside a hook */ + lua_unlock(L); + return 0; /* return to 'luaD_hook' */ +} + + +/* +** Auxiliary structure to call 'luaF_close' in protected mode. +*/ +struct CloseP { + StkId level; + int status; +}; + + +/* +** Auxiliary function to call 'luaF_close' in protected mode. +*/ +static void closepaux (lua_State *L, void *ud) { + struct CloseP *pcl = cast(struct CloseP *, ud); + luaF_close(L, pcl->level, pcl->status, 0); +} + + +/* +** Calls 'luaF_close' in protected mode. Return the original status +** or, in case of errors, the new status. +*/ +int luaD_closeprotected (lua_State *L, ptrdiff_t level, int status) { + CallInfo *old_ci = L->ci; + lu_byte old_allowhooks = L->allowhook; + for (;;) { /* keep closing upvalues until no more errors */ + struct CloseP pcl; + pcl.level = restorestack(L, level); pcl.status = status; + status = luaD_rawrunprotected(L, &closepaux, &pcl); + if (l_likely(status == LUA_OK)) /* no more errors? */ + return pcl.status; + else { /* an error occurred; restore saved state and repeat */ + L->ci = old_ci; + L->allowhook = old_allowhooks; + } + } +} + + +/* +** Call the C function 'func' in protected mode, restoring basic +** thread information ('allowhook', etc.) and in particular +** its stack level in case of errors. +*/ +int luaD_pcall (lua_State *L, Pfunc func, void *u, + ptrdiff_t old_top, ptrdiff_t ef) { + int status; + CallInfo *old_ci = L->ci; + lu_byte old_allowhooks = L->allowhook; + ptrdiff_t old_errfunc = L->errfunc; + L->errfunc = ef; + status = luaD_rawrunprotected(L, func, u); + if (l_unlikely(status != LUA_OK)) { /* an error occurred? */ + L->ci = old_ci; + L->allowhook = old_allowhooks; + status = luaD_closeprotected(L, old_top, status); + luaD_seterrorobj(L, status, restorestack(L, old_top)); + luaD_shrinkstack(L); /* restore stack size in case of overflow */ + } + L->errfunc = old_errfunc; + return status; +} + + + +/* +** Execute a protected parser. +*/ +struct SParser { /* data to 'f_parser' */ + ZIO *z; + Mbuffer buff; /* dynamic structure used by the scanner */ + Dyndata dyd; /* dynamic structures used by the parser */ + const char *mode; + const char *name; +}; + + +static void checkmode (lua_State *L, const char *mode, const char *x) { + if (mode && strchr(mode, x[0]) == NULL) { + luaO_pushfstring(L, + "attempt to load a %s chunk (mode is '%s')", x, mode); + luaD_throw(L, LUA_ERRSYNTAX); + } +} + + +static void f_parser (lua_State *L, void *ud) { + LClosure *cl; + struct SParser *p = cast(struct SParser *, ud); + int c = zgetc(p->z); /* read first character */ + if (c == LUA_SIGNATURE[0]) { + checkmode(L, p->mode, "binary"); + cl = luaU_undump(L, p->z, p->name); + } + else { + checkmode(L, p->mode, "text"); + cl = luaY_parser(L, p->z, &p->buff, &p->dyd, p->name, c); + } + lua_assert(cl->nupvalues == cl->p->sizeupvalues); + luaF_initupvals(L, cl); +} + + +int luaD_protectedparser (lua_State *L, ZIO *z, const char *name, + const char *mode) { + struct SParser p; + int status; + incnny(L); /* cannot yield during parsing */ + p.z = z; p.name = name; p.mode = mode; + p.dyd.actvar.arr = NULL; p.dyd.actvar.size = 0; + p.dyd.gt.arr = NULL; p.dyd.gt.size = 0; + p.dyd.label.arr = NULL; p.dyd.label.size = 0; + luaZ_initbuffer(L, &p.buff); + status = luaD_pcall(L, f_parser, &p, savestack(L, L->top.p), L->errfunc); + luaZ_freebuffer(L, &p.buff); + luaM_freearray(L, p.dyd.actvar.arr, p.dyd.actvar.size); + luaM_freearray(L, p.dyd.gt.arr, p.dyd.gt.size); + luaM_freearray(L, p.dyd.label.arr, p.dyd.label.size); + decnny(L); + return status; +} + + diff --git a/06/lua-5.4.6/src/ldo.h b/06/lua-5.4.6/src/ldo.h new file mode 100644 index 0000000..1aa446a --- /dev/null +++ b/06/lua-5.4.6/src/ldo.h @@ -0,0 +1,88 @@ +/* +** $Id: ldo.h $ +** Stack and Call structure of Lua +** See Copyright Notice in lua.h +*/ + +#ifndef ldo_h +#define ldo_h + + +#include "llimits.h" +#include "lobject.h" +#include "lstate.h" +#include "lzio.h" + + +/* +** Macro to check stack size and grow stack if needed. Parameters +** 'pre'/'pos' allow the macro to preserve a pointer into the +** stack across reallocations, doing the work only when needed. +** It also allows the running of one GC step when the stack is +** reallocated. +** 'condmovestack' is used in heavy tests to force a stack reallocation +** at every check. +*/ +#define luaD_checkstackaux(L,n,pre,pos) \ + if (l_unlikely(L->stack_last.p - L->top.p <= (n))) \ + { pre; luaD_growstack(L, n, 1); pos; } \ + else { condmovestack(L,pre,pos); } + +/* In general, 'pre'/'pos' are empty (nothing to save) */ +#define luaD_checkstack(L,n) luaD_checkstackaux(L,n,(void)0,(void)0) + + + +#define savestack(L,pt) (cast_charp(pt) - cast_charp(L->stack.p)) +#define restorestack(L,n) cast(StkId, cast_charp(L->stack.p) + (n)) + + +/* macro to check stack size, preserving 'p' */ +#define checkstackp(L,n,p) \ + luaD_checkstackaux(L, n, \ + ptrdiff_t t__ = savestack(L, p), /* save 'p' */ \ + p = restorestack(L, t__)) /* 'pos' part: restore 'p' */ + + +/* macro to check stack size and GC, preserving 'p' */ +#define checkstackGCp(L,n,p) \ + luaD_checkstackaux(L, n, \ + ptrdiff_t t__ = savestack(L, p); /* save 'p' */ \ + luaC_checkGC(L), /* stack grow uses memory */ \ + p = restorestack(L, t__)) /* 'pos' part: restore 'p' */ + + +/* macro to check stack size and GC */ +#define checkstackGC(L,fsize) \ + luaD_checkstackaux(L, (fsize), luaC_checkGC(L), (void)0) + + +/* type of protected functions, to be ran by 'runprotected' */ +typedef void (*Pfunc) (lua_State *L, void *ud); + +LUAI_FUNC void luaD_seterrorobj (lua_State *L, int errcode, StkId oldtop); +LUAI_FUNC int luaD_protectedparser (lua_State *L, ZIO *z, const char *name, + const char *mode); +LUAI_FUNC void luaD_hook (lua_State *L, int event, int line, + int fTransfer, int nTransfer); +LUAI_FUNC void luaD_hookcall (lua_State *L, CallInfo *ci); +LUAI_FUNC int luaD_pretailcall (lua_State *L, CallInfo *ci, StkId func, + int narg1, int delta); +LUAI_FUNC CallInfo *luaD_precall (lua_State *L, StkId func, int nResults); +LUAI_FUNC void luaD_call (lua_State *L, StkId func, int nResults); +LUAI_FUNC void luaD_callnoyield (lua_State *L, StkId func, int nResults); +LUAI_FUNC StkId luaD_tryfuncTM (lua_State *L, StkId func); +LUAI_FUNC int luaD_closeprotected (lua_State *L, ptrdiff_t level, int status); +LUAI_FUNC int luaD_pcall (lua_State *L, Pfunc func, void *u, + ptrdiff_t oldtop, ptrdiff_t ef); +LUAI_FUNC void luaD_poscall (lua_State *L, CallInfo *ci, int nres); +LUAI_FUNC int luaD_reallocstack (lua_State *L, int newsize, int raiseerror); +LUAI_FUNC int luaD_growstack (lua_State *L, int n, int raiseerror); +LUAI_FUNC void luaD_shrinkstack (lua_State *L); +LUAI_FUNC void luaD_inctop (lua_State *L); + +LUAI_FUNC l_noret luaD_throw (lua_State *L, int errcode); +LUAI_FUNC int luaD_rawrunprotected (lua_State *L, Pfunc f, void *ud); + +#endif + diff --git a/06/lua-5.4.6/src/ldump.c b/06/lua-5.4.6/src/ldump.c new file mode 100644 index 0000000..f231691 --- /dev/null +++ b/06/lua-5.4.6/src/ldump.c @@ -0,0 +1,230 @@ +/* +** $Id: ldump.c $ +** save precompiled Lua chunks +** See Copyright Notice in lua.h +*/ + +#define ldump_c +#define LUA_CORE + +#include "lprefix.h" + + +#include +#include + +#include "lua.h" + +#include "lobject.h" +#include "lstate.h" +#include "lundump.h" + + +typedef struct { + lua_State *L; + lua_Writer writer; + void *data; + int strip; + int status; +} DumpState; + + +/* +** All high-level dumps go through dumpVector; you can change it to +** change the endianness of the result +*/ +#define dumpVector(D,v,n) dumpBlock(D,v,(n)*sizeof((v)[0])) + +#define dumpLiteral(D, s) dumpBlock(D,s,sizeof(s) - sizeof(char)) + + +static void dumpBlock (DumpState *D, const void *b, size_t size) { + if (D->status == 0 && size > 0) { + lua_unlock(D->L); + D->status = (*D->writer)(D->L, b, size, D->data); + lua_lock(D->L); + } +} + + +#define dumpVar(D,x) dumpVector(D,&x,1) + + +static void dumpByte (DumpState *D, int y) { + lu_byte x = (lu_byte)y; + dumpVar(D, x); +} + + +/* +** 'dumpSize' buffer size: each byte can store up to 7 bits. (The "+6" +** rounds up the division.) +*/ +#define DIBS ((sizeof(size_t) * CHAR_BIT + 6) / 7) + +static void dumpSize (DumpState *D, size_t x) { + lu_byte buff[DIBS]; + int n = 0; + do { + buff[DIBS - (++n)] = x & 0x7f; /* fill buffer in reverse order */ + x >>= 7; + } while (x != 0); + buff[DIBS - 1] |= 0x80; /* mark last byte */ + dumpVector(D, buff + DIBS - n, n); +} + + +static void dumpInt (DumpState *D, int x) { + dumpSize(D, x); +} + + +static void dumpNumber (DumpState *D, lua_Number x) { + dumpVar(D, x); +} + + +static void dumpInteger (DumpState *D, lua_Integer x) { + dumpVar(D, x); +} + + +static void dumpString (DumpState *D, const TString *s) { + if (s == NULL) + dumpSize(D, 0); + else { + size_t size = tsslen(s); + const char *str = getstr(s); + dumpSize(D, size + 1); + dumpVector(D, str, size); + } +} + + +static void dumpCode (DumpState *D, const Proto *f) { + dumpInt(D, f->sizecode); + dumpVector(D, f->code, f->sizecode); +} + + +static void dumpFunction(DumpState *D, const Proto *f, TString *psource); + +static void dumpConstants (DumpState *D, const Proto *f) { + int i; + int n = f->sizek; + dumpInt(D, n); + for (i = 0; i < n; i++) { + const TValue *o = &f->k[i]; + int tt = ttypetag(o); + dumpByte(D, tt); + switch (tt) { + case LUA_VNUMFLT: + dumpNumber(D, fltvalue(o)); + break; + case LUA_VNUMINT: + dumpInteger(D, ivalue(o)); + break; + case LUA_VSHRSTR: + case LUA_VLNGSTR: + dumpString(D, tsvalue(o)); + break; + default: + lua_assert(tt == LUA_VNIL || tt == LUA_VFALSE || tt == LUA_VTRUE); + } + } +} + + +static void dumpProtos (DumpState *D, const Proto *f) { + int i; + int n = f->sizep; + dumpInt(D, n); + for (i = 0; i < n; i++) + dumpFunction(D, f->p[i], f->source); +} + + +static void dumpUpvalues (DumpState *D, const Proto *f) { + int i, n = f->sizeupvalues; + dumpInt(D, n); + for (i = 0; i < n; i++) { + dumpByte(D, f->upvalues[i].instack); + dumpByte(D, f->upvalues[i].idx); + dumpByte(D, f->upvalues[i].kind); + } +} + + +static void dumpDebug (DumpState *D, const Proto *f) { + int i, n; + n = (D->strip) ? 0 : f->sizelineinfo; + dumpInt(D, n); + dumpVector(D, f->lineinfo, n); + n = (D->strip) ? 0 : f->sizeabslineinfo; + dumpInt(D, n); + for (i = 0; i < n; i++) { + dumpInt(D, f->abslineinfo[i].pc); + dumpInt(D, f->abslineinfo[i].line); + } + n = (D->strip) ? 0 : f->sizelocvars; + dumpInt(D, n); + for (i = 0; i < n; i++) { + dumpString(D, f->locvars[i].varname); + dumpInt(D, f->locvars[i].startpc); + dumpInt(D, f->locvars[i].endpc); + } + n = (D->strip) ? 0 : f->sizeupvalues; + dumpInt(D, n); + for (i = 0; i < n; i++) + dumpString(D, f->upvalues[i].name); +} + + +static void dumpFunction (DumpState *D, const Proto *f, TString *psource) { + if (D->strip || f->source == psource) + dumpString(D, NULL); /* no debug info or same source as its parent */ + else + dumpString(D, f->source); + dumpInt(D, f->linedefined); + dumpInt(D, f->lastlinedefined); + dumpByte(D, f->numparams); + dumpByte(D, f->is_vararg); + dumpByte(D, f->maxstacksize); + dumpCode(D, f); + dumpConstants(D, f); + dumpUpvalues(D, f); + dumpProtos(D, f); + dumpDebug(D, f); +} + + +static void dumpHeader (DumpState *D) { + dumpLiteral(D, LUA_SIGNATURE); + dumpByte(D, LUAC_VERSION); + dumpByte(D, LUAC_FORMAT); + dumpLiteral(D, LUAC_DATA); + dumpByte(D, sizeof(Instruction)); + dumpByte(D, sizeof(lua_Integer)); + dumpByte(D, sizeof(lua_Number)); + dumpInteger(D, LUAC_INT); + dumpNumber(D, LUAC_NUM); +} + + +/* +** dump Lua function as precompiled chunk +*/ +int luaU_dump(lua_State *L, const Proto *f, lua_Writer w, void *data, + int strip) { + DumpState D; + D.L = L; + D.writer = w; + D.data = data; + D.strip = strip; + D.status = 0; + dumpHeader(&D); + dumpByte(&D, f->sizeupvalues); + dumpFunction(&D, f, NULL); + return D.status; +} + diff --git a/06/lua-5.4.6/src/lfunc.c b/06/lua-5.4.6/src/lfunc.c new file mode 100644 index 0000000..0945f24 --- /dev/null +++ b/06/lua-5.4.6/src/lfunc.c @@ -0,0 +1,294 @@ +/* +** $Id: lfunc.c $ +** Auxiliary functions to manipulate prototypes and closures +** See Copyright Notice in lua.h +*/ + +#define lfunc_c +#define LUA_CORE + +#include "lprefix.h" + + +#include + +#include "lua.h" + +#include "ldebug.h" +#include "ldo.h" +#include "lfunc.h" +#include "lgc.h" +#include "lmem.h" +#include "lobject.h" +#include "lstate.h" + + + +CClosure *luaF_newCclosure (lua_State *L, int nupvals) { + GCObject *o = luaC_newobj(L, LUA_VCCL, sizeCclosure(nupvals)); + CClosure *c = gco2ccl(o); + c->nupvalues = cast_byte(nupvals); + return c; +} + + +LClosure *luaF_newLclosure (lua_State *L, int nupvals) { + GCObject *o = luaC_newobj(L, LUA_VLCL, sizeLclosure(nupvals)); + LClosure *c = gco2lcl(o); + c->p = NULL; + c->nupvalues = cast_byte(nupvals); + while (nupvals--) c->upvals[nupvals] = NULL; + return c; +} + + +/* +** fill a closure with new closed upvalues +*/ +void luaF_initupvals (lua_State *L, LClosure *cl) { + int i; + for (i = 0; i < cl->nupvalues; i++) { + GCObject *o = luaC_newobj(L, LUA_VUPVAL, sizeof(UpVal)); + UpVal *uv = gco2upv(o); + uv->v.p = &uv->u.value; /* make it closed */ + setnilvalue(uv->v.p); + cl->upvals[i] = uv; + luaC_objbarrier(L, cl, uv); + } +} + + +/* +** Create a new upvalue at the given level, and link it to the list of +** open upvalues of 'L' after entry 'prev'. +**/ +static UpVal *newupval (lua_State *L, StkId level, UpVal **prev) { + GCObject *o = luaC_newobj(L, LUA_VUPVAL, sizeof(UpVal)); + UpVal *uv = gco2upv(o); + UpVal *next = *prev; + uv->v.p = s2v(level); /* current value lives in the stack */ + uv->u.open.next = next; /* link it to list of open upvalues */ + uv->u.open.previous = prev; + if (next) + next->u.open.previous = &uv->u.open.next; + *prev = uv; + if (!isintwups(L)) { /* thread not in list of threads with upvalues? */ + L->twups = G(L)->twups; /* link it to the list */ + G(L)->twups = L; + } + return uv; +} + + +/* +** Find and reuse, or create if it does not exist, an upvalue +** at the given level. +*/ +UpVal *luaF_findupval (lua_State *L, StkId level) { + UpVal **pp = &L->openupval; + UpVal *p; + lua_assert(isintwups(L) || L->openupval == NULL); + while ((p = *pp) != NULL && uplevel(p) >= level) { /* search for it */ + lua_assert(!isdead(G(L), p)); + if (uplevel(p) == level) /* corresponding upvalue? */ + return p; /* return it */ + pp = &p->u.open.next; + } + /* not found: create a new upvalue after 'pp' */ + return newupval(L, level, pp); +} + + +/* +** Call closing method for object 'obj' with error message 'err'. The +** boolean 'yy' controls whether the call is yieldable. +** (This function assumes EXTRA_STACK.) +*/ +static void callclosemethod (lua_State *L, TValue *obj, TValue *err, int yy) { + StkId top = L->top.p; + const TValue *tm = luaT_gettmbyobj(L, obj, TM_CLOSE); + setobj2s(L, top, tm); /* will call metamethod... */ + setobj2s(L, top + 1, obj); /* with 'self' as the 1st argument */ + setobj2s(L, top + 2, err); /* and error msg. as 2nd argument */ + L->top.p = top + 3; /* add function and arguments */ + if (yy) + luaD_call(L, top, 0); + else + luaD_callnoyield(L, top, 0); +} + + +/* +** Check whether object at given level has a close metamethod and raise +** an error if not. +*/ +static void checkclosemth (lua_State *L, StkId level) { + const TValue *tm = luaT_gettmbyobj(L, s2v(level), TM_CLOSE); + if (ttisnil(tm)) { /* no metamethod? */ + int idx = cast_int(level - L->ci->func.p); /* variable index */ + const char *vname = luaG_findlocal(L, L->ci, idx, NULL); + if (vname == NULL) vname = "?"; + luaG_runerror(L, "variable '%s' got a non-closable value", vname); + } +} + + +/* +** Prepare and call a closing method. +** If status is CLOSEKTOP, the call to the closing method will be pushed +** at the top of the stack. Otherwise, values can be pushed right after +** the 'level' of the upvalue being closed, as everything after that +** won't be used again. +*/ +static void prepcallclosemth (lua_State *L, StkId level, int status, int yy) { + TValue *uv = s2v(level); /* value being closed */ + TValue *errobj; + if (status == CLOSEKTOP) + errobj = &G(L)->nilvalue; /* error object is nil */ + else { /* 'luaD_seterrorobj' will set top to level + 2 */ + errobj = s2v(level + 1); /* error object goes after 'uv' */ + luaD_seterrorobj(L, status, level + 1); /* set error object */ + } + callclosemethod(L, uv, errobj, yy); +} + + +/* +** Maximum value for deltas in 'tbclist', dependent on the type +** of delta. (This macro assumes that an 'L' is in scope where it +** is used.) +*/ +#define MAXDELTA \ + ((256ul << ((sizeof(L->stack.p->tbclist.delta) - 1) * 8)) - 1) + + +/* +** Insert a variable in the list of to-be-closed variables. +*/ +void luaF_newtbcupval (lua_State *L, StkId level) { + lua_assert(level > L->tbclist.p); + if (l_isfalse(s2v(level))) + return; /* false doesn't need to be closed */ + checkclosemth(L, level); /* value must have a close method */ + while (cast_uint(level - L->tbclist.p) > MAXDELTA) { + L->tbclist.p += MAXDELTA; /* create a dummy node at maximum delta */ + L->tbclist.p->tbclist.delta = 0; + } + level->tbclist.delta = cast(unsigned short, level - L->tbclist.p); + L->tbclist.p = level; +} + + +void luaF_unlinkupval (UpVal *uv) { + lua_assert(upisopen(uv)); + *uv->u.open.previous = uv->u.open.next; + if (uv->u.open.next) + uv->u.open.next->u.open.previous = uv->u.open.previous; +} + + +/* +** Close all upvalues up to the given stack level. +*/ +void luaF_closeupval (lua_State *L, StkId level) { + UpVal *uv; + StkId upl; /* stack index pointed by 'uv' */ + while ((uv = L->openupval) != NULL && (upl = uplevel(uv)) >= level) { + TValue *slot = &uv->u.value; /* new position for value */ + lua_assert(uplevel(uv) < L->top.p); + luaF_unlinkupval(uv); /* remove upvalue from 'openupval' list */ + setobj(L, slot, uv->v.p); /* move value to upvalue slot */ + uv->v.p = slot; /* now current value lives here */ + if (!iswhite(uv)) { /* neither white nor dead? */ + nw2black(uv); /* closed upvalues cannot be gray */ + luaC_barrier(L, uv, slot); + } + } +} + + +/* +** Remove first element from the tbclist plus its dummy nodes. +*/ +static void poptbclist (lua_State *L) { + StkId tbc = L->tbclist.p; + lua_assert(tbc->tbclist.delta > 0); /* first element cannot be dummy */ + tbc -= tbc->tbclist.delta; + while (tbc > L->stack.p && tbc->tbclist.delta == 0) + tbc -= MAXDELTA; /* remove dummy nodes */ + L->tbclist.p = tbc; +} + + +/* +** Close all upvalues and to-be-closed variables up to the given stack +** level. Return restored 'level'. +*/ +StkId luaF_close (lua_State *L, StkId level, int status, int yy) { + ptrdiff_t levelrel = savestack(L, level); + luaF_closeupval(L, level); /* first, close the upvalues */ + while (L->tbclist.p >= level) { /* traverse tbc's down to that level */ + StkId tbc = L->tbclist.p; /* get variable index */ + poptbclist(L); /* remove it from list */ + prepcallclosemth(L, tbc, status, yy); /* close variable */ + level = restorestack(L, levelrel); + } + return level; +} + + +Proto *luaF_newproto (lua_State *L) { + GCObject *o = luaC_newobj(L, LUA_VPROTO, sizeof(Proto)); + Proto *f = gco2p(o); + f->k = NULL; + f->sizek = 0; + f->p = NULL; + f->sizep = 0; + f->code = NULL; + f->sizecode = 0; + f->lineinfo = NULL; + f->sizelineinfo = 0; + f->abslineinfo = NULL; + f->sizeabslineinfo = 0; + f->upvalues = NULL; + f->sizeupvalues = 0; + f->numparams = 0; + f->is_vararg = 0; + f->maxstacksize = 0; + f->locvars = NULL; + f->sizelocvars = 0; + f->linedefined = 0; + f->lastlinedefined = 0; + f->source = NULL; + return f; +} + + +void luaF_freeproto (lua_State *L, Proto *f) { + luaM_freearray(L, f->code, f->sizecode); + luaM_freearray(L, f->p, f->sizep); + luaM_freearray(L, f->k, f->sizek); + luaM_freearray(L, f->lineinfo, f->sizelineinfo); + luaM_freearray(L, f->abslineinfo, f->sizeabslineinfo); + luaM_freearray(L, f->locvars, f->sizelocvars); + luaM_freearray(L, f->upvalues, f->sizeupvalues); + luaM_free(L, f); +} + + +/* +** Look for n-th local variable at line 'line' in function 'func'. +** Returns NULL if not found. +*/ +const char *luaF_getlocalname (const Proto *f, int local_number, int pc) { + int i; + for (i = 0; isizelocvars && f->locvars[i].startpc <= pc; i++) { + if (pc < f->locvars[i].endpc) { /* is variable active? */ + local_number--; + if (local_number == 0) + return getstr(f->locvars[i].varname); + } + } + return NULL; /* not found */ +} + diff --git a/06/lua-5.4.6/src/lfunc.h b/06/lua-5.4.6/src/lfunc.h new file mode 100644 index 0000000..3be265e --- /dev/null +++ b/06/lua-5.4.6/src/lfunc.h @@ -0,0 +1,64 @@ +/* +** $Id: lfunc.h $ +** Auxiliary functions to manipulate prototypes and closures +** See Copyright Notice in lua.h +*/ + +#ifndef lfunc_h +#define lfunc_h + + +#include "lobject.h" + + +#define sizeCclosure(n) (cast_int(offsetof(CClosure, upvalue)) + \ + cast_int(sizeof(TValue)) * (n)) + +#define sizeLclosure(n) (cast_int(offsetof(LClosure, upvals)) + \ + cast_int(sizeof(TValue *)) * (n)) + + +/* test whether thread is in 'twups' list */ +#define isintwups(L) (L->twups != L) + + +/* +** maximum number of upvalues in a closure (both C and Lua). (Value +** must fit in a VM register.) +*/ +#define MAXUPVAL 255 + + +#define upisopen(up) ((up)->v.p != &(up)->u.value) + + +#define uplevel(up) check_exp(upisopen(up), cast(StkId, (up)->v.p)) + + +/* +** maximum number of misses before giving up the cache of closures +** in prototypes +*/ +#define MAXMISS 10 + + + +/* special status to close upvalues preserving the top of the stack */ +#define CLOSEKTOP (-1) + + +LUAI_FUNC Proto *luaF_newproto (lua_State *L); +LUAI_FUNC CClosure *luaF_newCclosure (lua_State *L, int nupvals); +LUAI_FUNC LClosure *luaF_newLclosure (lua_State *L, int nupvals); +LUAI_FUNC void luaF_initupvals (lua_State *L, LClosure *cl); +LUAI_FUNC UpVal *luaF_findupval (lua_State *L, StkId level); +LUAI_FUNC void luaF_newtbcupval (lua_State *L, StkId level); +LUAI_FUNC void luaF_closeupval (lua_State *L, StkId level); +LUAI_FUNC StkId luaF_close (lua_State *L, StkId level, int status, int yy); +LUAI_FUNC void luaF_unlinkupval (UpVal *uv); +LUAI_FUNC void luaF_freeproto (lua_State *L, Proto *f); +LUAI_FUNC const char *luaF_getlocalname (const Proto *func, int local_number, + int pc); + + +#endif diff --git a/06/lua-5.4.6/src/lgc.c b/06/lua-5.4.6/src/lgc.c new file mode 100644 index 0000000..a3094ff --- /dev/null +++ b/06/lua-5.4.6/src/lgc.c @@ -0,0 +1,1739 @@ +/* +** $Id: lgc.c $ +** Garbage Collector +** See Copyright Notice in lua.h +*/ + +#define lgc_c +#define LUA_CORE + +#include "lprefix.h" + +#include +#include + + +#include "lua.h" + +#include "ldebug.h" +#include "ldo.h" +#include "lfunc.h" +#include "lgc.h" +#include "lmem.h" +#include "lobject.h" +#include "lstate.h" +#include "lstring.h" +#include "ltable.h" +#include "ltm.h" + + +/* +** Maximum number of elements to sweep in each single step. +** (Large enough to dissipate fixed overheads but small enough +** to allow small steps for the collector.) +*/ +#define GCSWEEPMAX 100 + +/* +** Maximum number of finalizers to call in each single step. +*/ +#define GCFINMAX 10 + + +/* +** Cost of calling one finalizer. +*/ +#define GCFINALIZECOST 50 + + +/* +** The equivalent, in bytes, of one unit of "work" (visiting a slot, +** sweeping an object, etc.) +*/ +#define WORK2MEM sizeof(TValue) + + +/* +** macro to adjust 'pause': 'pause' is actually used like +** 'pause / PAUSEADJ' (value chosen by tests) +*/ +#define PAUSEADJ 100 + + +/* mask with all color bits */ +#define maskcolors (bitmask(BLACKBIT) | WHITEBITS) + +/* mask with all GC bits */ +#define maskgcbits (maskcolors | AGEBITS) + + +/* macro to erase all color bits then set only the current white bit */ +#define makewhite(g,x) \ + (x->marked = cast_byte((x->marked & ~maskcolors) | luaC_white(g))) + +/* make an object gray (neither white nor black) */ +#define set2gray(x) resetbits(x->marked, maskcolors) + + +/* make an object black (coming from any color) */ +#define set2black(x) \ + (x->marked = cast_byte((x->marked & ~WHITEBITS) | bitmask(BLACKBIT))) + + +#define valiswhite(x) (iscollectable(x) && iswhite(gcvalue(x))) + +#define keyiswhite(n) (keyiscollectable(n) && iswhite(gckey(n))) + + +/* +** Protected access to objects in values +*/ +#define gcvalueN(o) (iscollectable(o) ? gcvalue(o) : NULL) + + +#define markvalue(g,o) { checkliveness(g->mainthread,o); \ + if (valiswhite(o)) reallymarkobject(g,gcvalue(o)); } + +#define markkey(g, n) { if keyiswhite(n) reallymarkobject(g,gckey(n)); } + +#define markobject(g,t) { if (iswhite(t)) reallymarkobject(g, obj2gco(t)); } + +/* +** mark an object that can be NULL (either because it is really optional, +** or it was stripped as debug info, or inside an uncompleted structure) +*/ +#define markobjectN(g,t) { if (t) markobject(g,t); } + +static void reallymarkobject (global_State *g, GCObject *o); +static lu_mem atomic (lua_State *L); +static void entersweep (lua_State *L); + + +/* +** {====================================================== +** Generic functions +** ======================================================= +*/ + + +/* +** one after last element in a hash array +*/ +#define gnodelast(h) gnode(h, cast_sizet(sizenode(h))) + + +static GCObject **getgclist (GCObject *o) { + switch (o->tt) { + case LUA_VTABLE: return &gco2t(o)->gclist; + case LUA_VLCL: return &gco2lcl(o)->gclist; + case LUA_VCCL: return &gco2ccl(o)->gclist; + case LUA_VTHREAD: return &gco2th(o)->gclist; + case LUA_VPROTO: return &gco2p(o)->gclist; + case LUA_VUSERDATA: { + Udata *u = gco2u(o); + lua_assert(u->nuvalue > 0); + return &u->gclist; + } + default: lua_assert(0); return 0; + } +} + + +/* +** Link a collectable object 'o' with a known type into the list 'p'. +** (Must be a macro to access the 'gclist' field in different types.) +*/ +#define linkgclist(o,p) linkgclist_(obj2gco(o), &(o)->gclist, &(p)) + +static void linkgclist_ (GCObject *o, GCObject **pnext, GCObject **list) { + lua_assert(!isgray(o)); /* cannot be in a gray list */ + *pnext = *list; + *list = o; + set2gray(o); /* now it is */ +} + + +/* +** Link a generic collectable object 'o' into the list 'p'. +*/ +#define linkobjgclist(o,p) linkgclist_(obj2gco(o), getgclist(o), &(p)) + + + +/* +** Clear keys for empty entries in tables. If entry is empty, mark its +** entry as dead. This allows the collection of the key, but keeps its +** entry in the table: its removal could break a chain and could break +** a table traversal. Other places never manipulate dead keys, because +** its associated empty value is enough to signal that the entry is +** logically empty. +*/ +static void clearkey (Node *n) { + lua_assert(isempty(gval(n))); + if (keyiscollectable(n)) + setdeadkey(n); /* unused key; remove it */ +} + + +/* +** tells whether a key or value can be cleared from a weak +** table. Non-collectable objects are never removed from weak +** tables. Strings behave as 'values', so are never removed too. for +** other objects: if really collected, cannot keep them; for objects +** being finalized, keep them in keys, but not in values +*/ +static int iscleared (global_State *g, const GCObject *o) { + if (o == NULL) return 0; /* non-collectable value */ + else if (novariant(o->tt) == LUA_TSTRING) { + markobject(g, o); /* strings are 'values', so are never weak */ + return 0; + } + else return iswhite(o); +} + + +/* +** Barrier that moves collector forward, that is, marks the white object +** 'v' being pointed by the black object 'o'. In the generational +** mode, 'v' must also become old, if 'o' is old; however, it cannot +** be changed directly to OLD, because it may still point to non-old +** objects. So, it is marked as OLD0. In the next cycle it will become +** OLD1, and in the next it will finally become OLD (regular old). By +** then, any object it points to will also be old. If called in the +** incremental sweep phase, it clears the black object to white (sweep +** it) to avoid other barrier calls for this same object. (That cannot +** be done is generational mode, as its sweep does not distinguish +** whites from deads.) +*/ +void luaC_barrier_ (lua_State *L, GCObject *o, GCObject *v) { + global_State *g = G(L); + lua_assert(isblack(o) && iswhite(v) && !isdead(g, v) && !isdead(g, o)); + if (keepinvariant(g)) { /* must keep invariant? */ + reallymarkobject(g, v); /* restore invariant */ + if (isold(o)) { + lua_assert(!isold(v)); /* white object could not be old */ + setage(v, G_OLD0); /* restore generational invariant */ + } + } + else { /* sweep phase */ + lua_assert(issweepphase(g)); + if (g->gckind == KGC_INC) /* incremental mode? */ + makewhite(g, o); /* mark 'o' as white to avoid other barriers */ + } +} + + +/* +** barrier that moves collector backward, that is, mark the black object +** pointing to a white object as gray again. +*/ +void luaC_barrierback_ (lua_State *L, GCObject *o) { + global_State *g = G(L); + lua_assert(isblack(o) && !isdead(g, o)); + lua_assert((g->gckind == KGC_GEN) == (isold(o) && getage(o) != G_TOUCHED1)); + if (getage(o) == G_TOUCHED2) /* already in gray list? */ + set2gray(o); /* make it gray to become touched1 */ + else /* link it in 'grayagain' and paint it gray */ + linkobjgclist(o, g->grayagain); + if (isold(o)) /* generational mode? */ + setage(o, G_TOUCHED1); /* touched in current cycle */ +} + + +void luaC_fix (lua_State *L, GCObject *o) { + global_State *g = G(L); + lua_assert(g->allgc == o); /* object must be 1st in 'allgc' list! */ + set2gray(o); /* they will be gray forever */ + setage(o, G_OLD); /* and old forever */ + g->allgc = o->next; /* remove object from 'allgc' list */ + o->next = g->fixedgc; /* link it to 'fixedgc' list */ + g->fixedgc = o; +} + + +/* +** create a new collectable object (with given type, size, and offset) +** and link it to 'allgc' list. +*/ +GCObject *luaC_newobjdt (lua_State *L, int tt, size_t sz, size_t offset) { + global_State *g = G(L); + char *p = cast_charp(luaM_newobject(L, novariant(tt), sz)); + GCObject *o = cast(GCObject *, p + offset); + o->marked = luaC_white(g); + o->tt = tt; + o->next = g->allgc; + g->allgc = o; + return o; +} + + +GCObject *luaC_newobj (lua_State *L, int tt, size_t sz) { + return luaC_newobjdt(L, tt, sz, 0); +} + +/* }====================================================== */ + + + +/* +** {====================================================== +** Mark functions +** ======================================================= +*/ + + +/* +** Mark an object. Userdata with no user values, strings, and closed +** upvalues are visited and turned black here. Open upvalues are +** already indirectly linked through their respective threads in the +** 'twups' list, so they don't go to the gray list; nevertheless, they +** are kept gray to avoid barriers, as their values will be revisited +** by the thread or by 'remarkupvals'. Other objects are added to the +** gray list to be visited (and turned black) later. Both userdata and +** upvalues can call this function recursively, but this recursion goes +** for at most two levels: An upvalue cannot refer to another upvalue +** (only closures can), and a userdata's metatable must be a table. +*/ +static void reallymarkobject (global_State *g, GCObject *o) { + switch (o->tt) { + case LUA_VSHRSTR: + case LUA_VLNGSTR: { + set2black(o); /* nothing to visit */ + break; + } + case LUA_VUPVAL: { + UpVal *uv = gco2upv(o); + if (upisopen(uv)) + set2gray(uv); /* open upvalues are kept gray */ + else + set2black(uv); /* closed upvalues are visited here */ + markvalue(g, uv->v.p); /* mark its content */ + break; + } + case LUA_VUSERDATA: { + Udata *u = gco2u(o); + if (u->nuvalue == 0) { /* no user values? */ + markobjectN(g, u->metatable); /* mark its metatable */ + set2black(u); /* nothing else to mark */ + break; + } + /* else... */ + } /* FALLTHROUGH */ + case LUA_VLCL: case LUA_VCCL: case LUA_VTABLE: + case LUA_VTHREAD: case LUA_VPROTO: { + linkobjgclist(o, g->gray); /* to be visited later */ + break; + } + default: lua_assert(0); break; + } +} + + +/* +** mark metamethods for basic types +*/ +static void markmt (global_State *g) { + int i; + for (i=0; i < LUA_NUMTAGS; i++) + markobjectN(g, g->mt[i]); +} + + +/* +** mark all objects in list of being-finalized +*/ +static lu_mem markbeingfnz (global_State *g) { + GCObject *o; + lu_mem count = 0; + for (o = g->tobefnz; o != NULL; o = o->next) { + count++; + markobject(g, o); + } + return count; +} + + +/* +** For each non-marked thread, simulates a barrier between each open +** upvalue and its value. (If the thread is collected, the value will be +** assigned to the upvalue, but then it can be too late for the barrier +** to act. The "barrier" does not need to check colors: A non-marked +** thread must be young; upvalues cannot be older than their threads; so +** any visited upvalue must be young too.) Also removes the thread from +** the list, as it was already visited. Removes also threads with no +** upvalues, as they have nothing to be checked. (If the thread gets an +** upvalue later, it will be linked in the list again.) +*/ +static int remarkupvals (global_State *g) { + lua_State *thread; + lua_State **p = &g->twups; + int work = 0; /* estimate of how much work was done here */ + while ((thread = *p) != NULL) { + work++; + if (!iswhite(thread) && thread->openupval != NULL) + p = &thread->twups; /* keep marked thread with upvalues in the list */ + else { /* thread is not marked or without upvalues */ + UpVal *uv; + lua_assert(!isold(thread) || thread->openupval == NULL); + *p = thread->twups; /* remove thread from the list */ + thread->twups = thread; /* mark that it is out of list */ + for (uv = thread->openupval; uv != NULL; uv = uv->u.open.next) { + lua_assert(getage(uv) <= getage(thread)); + work++; + if (!iswhite(uv)) { /* upvalue already visited? */ + lua_assert(upisopen(uv) && isgray(uv)); + markvalue(g, uv->v.p); /* mark its value */ + } + } + } + } + return work; +} + + +static void cleargraylists (global_State *g) { + g->gray = g->grayagain = NULL; + g->weak = g->allweak = g->ephemeron = NULL; +} + + +/* +** mark root set and reset all gray lists, to start a new collection +*/ +static void restartcollection (global_State *g) { + cleargraylists(g); + markobject(g, g->mainthread); + markvalue(g, &g->l_registry); + markmt(g); + markbeingfnz(g); /* mark any finalizing object left from previous cycle */ +} + +/* }====================================================== */ + + +/* +** {====================================================== +** Traverse functions +** ======================================================= +*/ + + +/* +** Check whether object 'o' should be kept in the 'grayagain' list for +** post-processing by 'correctgraylist'. (It could put all old objects +** in the list and leave all the work to 'correctgraylist', but it is +** more efficient to avoid adding elements that will be removed.) Only +** TOUCHED1 objects need to be in the list. TOUCHED2 doesn't need to go +** back to a gray list, but then it must become OLD. (That is what +** 'correctgraylist' does when it finds a TOUCHED2 object.) +*/ +static void genlink (global_State *g, GCObject *o) { + lua_assert(isblack(o)); + if (getage(o) == G_TOUCHED1) { /* touched in this cycle? */ + linkobjgclist(o, g->grayagain); /* link it back in 'grayagain' */ + } /* everything else do not need to be linked back */ + else if (getage(o) == G_TOUCHED2) + changeage(o, G_TOUCHED2, G_OLD); /* advance age */ +} + + +/* +** Traverse a table with weak values and link it to proper list. During +** propagate phase, keep it in 'grayagain' list, to be revisited in the +** atomic phase. In the atomic phase, if table has any white value, +** put it in 'weak' list, to be cleared. +*/ +static void traverseweakvalue (global_State *g, Table *h) { + Node *n, *limit = gnodelast(h); + /* if there is array part, assume it may have white values (it is not + worth traversing it now just to check) */ + int hasclears = (h->alimit > 0); + for (n = gnode(h, 0); n < limit; n++) { /* traverse hash part */ + if (isempty(gval(n))) /* entry is empty? */ + clearkey(n); /* clear its key */ + else { + lua_assert(!keyisnil(n)); + markkey(g, n); + if (!hasclears && iscleared(g, gcvalueN(gval(n)))) /* a white value? */ + hasclears = 1; /* table will have to be cleared */ + } + } + if (g->gcstate == GCSatomic && hasclears) + linkgclist(h, g->weak); /* has to be cleared later */ + else + linkgclist(h, g->grayagain); /* must retraverse it in atomic phase */ +} + + +/* +** Traverse an ephemeron table and link it to proper list. Returns true +** iff any object was marked during this traversal (which implies that +** convergence has to continue). During propagation phase, keep table +** in 'grayagain' list, to be visited again in the atomic phase. In +** the atomic phase, if table has any white->white entry, it has to +** be revisited during ephemeron convergence (as that key may turn +** black). Otherwise, if it has any white key, table has to be cleared +** (in the atomic phase). In generational mode, some tables +** must be kept in some gray list for post-processing; this is done +** by 'genlink'. +*/ +static int traverseephemeron (global_State *g, Table *h, int inv) { + int marked = 0; /* true if an object is marked in this traversal */ + int hasclears = 0; /* true if table has white keys */ + int hasww = 0; /* true if table has entry "white-key -> white-value" */ + unsigned int i; + unsigned int asize = luaH_realasize(h); + unsigned int nsize = sizenode(h); + /* traverse array part */ + for (i = 0; i < asize; i++) { + if (valiswhite(&h->array[i])) { + marked = 1; + reallymarkobject(g, gcvalue(&h->array[i])); + } + } + /* traverse hash part; if 'inv', traverse descending + (see 'convergeephemerons') */ + for (i = 0; i < nsize; i++) { + Node *n = inv ? gnode(h, nsize - 1 - i) : gnode(h, i); + if (isempty(gval(n))) /* entry is empty? */ + clearkey(n); /* clear its key */ + else if (iscleared(g, gckeyN(n))) { /* key is not marked (yet)? */ + hasclears = 1; /* table must be cleared */ + if (valiswhite(gval(n))) /* value not marked yet? */ + hasww = 1; /* white-white entry */ + } + else if (valiswhite(gval(n))) { /* value not marked yet? */ + marked = 1; + reallymarkobject(g, gcvalue(gval(n))); /* mark it now */ + } + } + /* link table into proper list */ + if (g->gcstate == GCSpropagate) + linkgclist(h, g->grayagain); /* must retraverse it in atomic phase */ + else if (hasww) /* table has white->white entries? */ + linkgclist(h, g->ephemeron); /* have to propagate again */ + else if (hasclears) /* table has white keys? */ + linkgclist(h, g->allweak); /* may have to clean white keys */ + else + genlink(g, obj2gco(h)); /* check whether collector still needs to see it */ + return marked; +} + + +static void traversestrongtable (global_State *g, Table *h) { + Node *n, *limit = gnodelast(h); + unsigned int i; + unsigned int asize = luaH_realasize(h); + for (i = 0; i < asize; i++) /* traverse array part */ + markvalue(g, &h->array[i]); + for (n = gnode(h, 0); n < limit; n++) { /* traverse hash part */ + if (isempty(gval(n))) /* entry is empty? */ + clearkey(n); /* clear its key */ + else { + lua_assert(!keyisnil(n)); + markkey(g, n); + markvalue(g, gval(n)); + } + } + genlink(g, obj2gco(h)); +} + + +static lu_mem traversetable (global_State *g, Table *h) { + const char *weakkey, *weakvalue; + const TValue *mode = gfasttm(g, h->metatable, TM_MODE); + markobjectN(g, h->metatable); + if (mode && ttisstring(mode) && /* is there a weak mode? */ + (cast_void(weakkey = strchr(svalue(mode), 'k')), + cast_void(weakvalue = strchr(svalue(mode), 'v')), + (weakkey || weakvalue))) { /* is really weak? */ + if (!weakkey) /* strong keys? */ + traverseweakvalue(g, h); + else if (!weakvalue) /* strong values? */ + traverseephemeron(g, h, 0); + else /* all weak */ + linkgclist(h, g->allweak); /* nothing to traverse now */ + } + else /* not weak */ + traversestrongtable(g, h); + return 1 + h->alimit + 2 * allocsizenode(h); +} + + +static int traverseudata (global_State *g, Udata *u) { + int i; + markobjectN(g, u->metatable); /* mark its metatable */ + for (i = 0; i < u->nuvalue; i++) + markvalue(g, &u->uv[i].uv); + genlink(g, obj2gco(u)); + return 1 + u->nuvalue; +} + + +/* +** Traverse a prototype. (While a prototype is being build, its +** arrays can be larger than needed; the extra slots are filled with +** NULL, so the use of 'markobjectN') +*/ +static int traverseproto (global_State *g, Proto *f) { + int i; + markobjectN(g, f->source); + for (i = 0; i < f->sizek; i++) /* mark literals */ + markvalue(g, &f->k[i]); + for (i = 0; i < f->sizeupvalues; i++) /* mark upvalue names */ + markobjectN(g, f->upvalues[i].name); + for (i = 0; i < f->sizep; i++) /* mark nested protos */ + markobjectN(g, f->p[i]); + for (i = 0; i < f->sizelocvars; i++) /* mark local-variable names */ + markobjectN(g, f->locvars[i].varname); + return 1 + f->sizek + f->sizeupvalues + f->sizep + f->sizelocvars; +} + + +static int traverseCclosure (global_State *g, CClosure *cl) { + int i; + for (i = 0; i < cl->nupvalues; i++) /* mark its upvalues */ + markvalue(g, &cl->upvalue[i]); + return 1 + cl->nupvalues; +} + +/* +** Traverse a Lua closure, marking its prototype and its upvalues. +** (Both can be NULL while closure is being created.) +*/ +static int traverseLclosure (global_State *g, LClosure *cl) { + int i; + markobjectN(g, cl->p); /* mark its prototype */ + for (i = 0; i < cl->nupvalues; i++) { /* visit its upvalues */ + UpVal *uv = cl->upvals[i]; + markobjectN(g, uv); /* mark upvalue */ + } + return 1 + cl->nupvalues; +} + + +/* +** Traverse a thread, marking the elements in the stack up to its top +** and cleaning the rest of the stack in the final traversal. That +** ensures that the entire stack have valid (non-dead) objects. +** Threads have no barriers. In gen. mode, old threads must be visited +** at every cycle, because they might point to young objects. In inc. +** mode, the thread can still be modified before the end of the cycle, +** and therefore it must be visited again in the atomic phase. To ensure +** these visits, threads must return to a gray list if they are not new +** (which can only happen in generational mode) or if the traverse is in +** the propagate phase (which can only happen in incremental mode). +*/ +static int traversethread (global_State *g, lua_State *th) { + UpVal *uv; + StkId o = th->stack.p; + if (isold(th) || g->gcstate == GCSpropagate) + linkgclist(th, g->grayagain); /* insert into 'grayagain' list */ + if (o == NULL) + return 1; /* stack not completely built yet */ + lua_assert(g->gcstate == GCSatomic || + th->openupval == NULL || isintwups(th)); + for (; o < th->top.p; o++) /* mark live elements in the stack */ + markvalue(g, s2v(o)); + for (uv = th->openupval; uv != NULL; uv = uv->u.open.next) + markobject(g, uv); /* open upvalues cannot be collected */ + if (g->gcstate == GCSatomic) { /* final traversal? */ + for (; o < th->stack_last.p + EXTRA_STACK; o++) + setnilvalue(s2v(o)); /* clear dead stack slice */ + /* 'remarkupvals' may have removed thread from 'twups' list */ + if (!isintwups(th) && th->openupval != NULL) { + th->twups = g->twups; /* link it back to the list */ + g->twups = th; + } + } + else if (!g->gcemergency) + luaD_shrinkstack(th); /* do not change stack in emergency cycle */ + return 1 + stacksize(th); +} + + +/* +** traverse one gray object, turning it to black. +*/ +static lu_mem propagatemark (global_State *g) { + GCObject *o = g->gray; + nw2black(o); + g->gray = *getgclist(o); /* remove from 'gray' list */ + switch (o->tt) { + case LUA_VTABLE: return traversetable(g, gco2t(o)); + case LUA_VUSERDATA: return traverseudata(g, gco2u(o)); + case LUA_VLCL: return traverseLclosure(g, gco2lcl(o)); + case LUA_VCCL: return traverseCclosure(g, gco2ccl(o)); + case LUA_VPROTO: return traverseproto(g, gco2p(o)); + case LUA_VTHREAD: return traversethread(g, gco2th(o)); + default: lua_assert(0); return 0; + } +} + + +static lu_mem propagateall (global_State *g) { + lu_mem tot = 0; + while (g->gray) + tot += propagatemark(g); + return tot; +} + + +/* +** Traverse all ephemeron tables propagating marks from keys to values. +** Repeat until it converges, that is, nothing new is marked. 'dir' +** inverts the direction of the traversals, trying to speed up +** convergence on chains in the same table. +** +*/ +static void convergeephemerons (global_State *g) { + int changed; + int dir = 0; + do { + GCObject *w; + GCObject *next = g->ephemeron; /* get ephemeron list */ + g->ephemeron = NULL; /* tables may return to this list when traversed */ + changed = 0; + while ((w = next) != NULL) { /* for each ephemeron table */ + Table *h = gco2t(w); + next = h->gclist; /* list is rebuilt during loop */ + nw2black(h); /* out of the list (for now) */ + if (traverseephemeron(g, h, dir)) { /* marked some value? */ + propagateall(g); /* propagate changes */ + changed = 1; /* will have to revisit all ephemeron tables */ + } + } + dir = !dir; /* invert direction next time */ + } while (changed); /* repeat until no more changes */ +} + +/* }====================================================== */ + + +/* +** {====================================================== +** Sweep Functions +** ======================================================= +*/ + + +/* +** clear entries with unmarked keys from all weaktables in list 'l' +*/ +static void clearbykeys (global_State *g, GCObject *l) { + for (; l; l = gco2t(l)->gclist) { + Table *h = gco2t(l); + Node *limit = gnodelast(h); + Node *n; + for (n = gnode(h, 0); n < limit; n++) { + if (iscleared(g, gckeyN(n))) /* unmarked key? */ + setempty(gval(n)); /* remove entry */ + if (isempty(gval(n))) /* is entry empty? */ + clearkey(n); /* clear its key */ + } + } +} + + +/* +** clear entries with unmarked values from all weaktables in list 'l' up +** to element 'f' +*/ +static void clearbyvalues (global_State *g, GCObject *l, GCObject *f) { + for (; l != f; l = gco2t(l)->gclist) { + Table *h = gco2t(l); + Node *n, *limit = gnodelast(h); + unsigned int i; + unsigned int asize = luaH_realasize(h); + for (i = 0; i < asize; i++) { + TValue *o = &h->array[i]; + if (iscleared(g, gcvalueN(o))) /* value was collected? */ + setempty(o); /* remove entry */ + } + for (n = gnode(h, 0); n < limit; n++) { + if (iscleared(g, gcvalueN(gval(n)))) /* unmarked value? */ + setempty(gval(n)); /* remove entry */ + if (isempty(gval(n))) /* is entry empty? */ + clearkey(n); /* clear its key */ + } + } +} + + +static void freeupval (lua_State *L, UpVal *uv) { + if (upisopen(uv)) + luaF_unlinkupval(uv); + luaM_free(L, uv); +} + + +static void freeobj (lua_State *L, GCObject *o) { + switch (o->tt) { + case LUA_VPROTO: + luaF_freeproto(L, gco2p(o)); + break; + case LUA_VUPVAL: + freeupval(L, gco2upv(o)); + break; + case LUA_VLCL: { + LClosure *cl = gco2lcl(o); + luaM_freemem(L, cl, sizeLclosure(cl->nupvalues)); + break; + } + case LUA_VCCL: { + CClosure *cl = gco2ccl(o); + luaM_freemem(L, cl, sizeCclosure(cl->nupvalues)); + break; + } + case LUA_VTABLE: + luaH_free(L, gco2t(o)); + break; + case LUA_VTHREAD: + luaE_freethread(L, gco2th(o)); + break; + case LUA_VUSERDATA: { + Udata *u = gco2u(o); + luaM_freemem(L, o, sizeudata(u->nuvalue, u->len)); + break; + } + case LUA_VSHRSTR: { + TString *ts = gco2ts(o); + luaS_remove(L, ts); /* remove it from hash table */ + luaM_freemem(L, ts, sizelstring(ts->shrlen)); + break; + } + case LUA_VLNGSTR: { + TString *ts = gco2ts(o); + luaM_freemem(L, ts, sizelstring(ts->u.lnglen)); + break; + } + default: lua_assert(0); + } +} + + +/* +** sweep at most 'countin' elements from a list of GCObjects erasing dead +** objects, where a dead object is one marked with the old (non current) +** white; change all non-dead objects back to white, preparing for next +** collection cycle. Return where to continue the traversal or NULL if +** list is finished. ('*countout' gets the number of elements traversed.) +*/ +static GCObject **sweeplist (lua_State *L, GCObject **p, int countin, + int *countout) { + global_State *g = G(L); + int ow = otherwhite(g); + int i; + int white = luaC_white(g); /* current white */ + for (i = 0; *p != NULL && i < countin; i++) { + GCObject *curr = *p; + int marked = curr->marked; + if (isdeadm(ow, marked)) { /* is 'curr' dead? */ + *p = curr->next; /* remove 'curr' from list */ + freeobj(L, curr); /* erase 'curr' */ + } + else { /* change mark to 'white' */ + curr->marked = cast_byte((marked & ~maskgcbits) | white); + p = &curr->next; /* go to next element */ + } + } + if (countout) + *countout = i; /* number of elements traversed */ + return (*p == NULL) ? NULL : p; +} + + +/* +** sweep a list until a live object (or end of list) +*/ +static GCObject **sweeptolive (lua_State *L, GCObject **p) { + GCObject **old = p; + do { + p = sweeplist(L, p, 1, NULL); + } while (p == old); + return p; +} + +/* }====================================================== */ + + +/* +** {====================================================== +** Finalization +** ======================================================= +*/ + +/* +** If possible, shrink string table. +*/ +static void checkSizes (lua_State *L, global_State *g) { + if (!g->gcemergency) { + if (g->strt.nuse < g->strt.size / 4) { /* string table too big? */ + l_mem olddebt = g->GCdebt; + luaS_resize(L, g->strt.size / 2); + g->GCestimate += g->GCdebt - olddebt; /* correct estimate */ + } + } +} + + +/* +** Get the next udata to be finalized from the 'tobefnz' list, and +** link it back into the 'allgc' list. +*/ +static GCObject *udata2finalize (global_State *g) { + GCObject *o = g->tobefnz; /* get first element */ + lua_assert(tofinalize(o)); + g->tobefnz = o->next; /* remove it from 'tobefnz' list */ + o->next = g->allgc; /* return it to 'allgc' list */ + g->allgc = o; + resetbit(o->marked, FINALIZEDBIT); /* object is "normal" again */ + if (issweepphase(g)) + makewhite(g, o); /* "sweep" object */ + else if (getage(o) == G_OLD1) + g->firstold1 = o; /* it is the first OLD1 object in the list */ + return o; +} + + +static void dothecall (lua_State *L, void *ud) { + UNUSED(ud); + luaD_callnoyield(L, L->top.p - 2, 0); +} + + +static void GCTM (lua_State *L) { + global_State *g = G(L); + const TValue *tm; + TValue v; + lua_assert(!g->gcemergency); + setgcovalue(L, &v, udata2finalize(g)); + tm = luaT_gettmbyobj(L, &v, TM_GC); + if (!notm(tm)) { /* is there a finalizer? */ + int status; + lu_byte oldah = L->allowhook; + int oldgcstp = g->gcstp; + g->gcstp |= GCSTPGC; /* avoid GC steps */ + L->allowhook = 0; /* stop debug hooks during GC metamethod */ + setobj2s(L, L->top.p++, tm); /* push finalizer... */ + setobj2s(L, L->top.p++, &v); /* ... and its argument */ + L->ci->callstatus |= CIST_FIN; /* will run a finalizer */ + status = luaD_pcall(L, dothecall, NULL, savestack(L, L->top.p - 2), 0); + L->ci->callstatus &= ~CIST_FIN; /* not running a finalizer anymore */ + L->allowhook = oldah; /* restore hooks */ + g->gcstp = oldgcstp; /* restore state */ + if (l_unlikely(status != LUA_OK)) { /* error while running __gc? */ + luaE_warnerror(L, "__gc"); + L->top.p--; /* pops error object */ + } + } +} + + +/* +** Call a few finalizers +*/ +static int runafewfinalizers (lua_State *L, int n) { + global_State *g = G(L); + int i; + for (i = 0; i < n && g->tobefnz; i++) + GCTM(L); /* call one finalizer */ + return i; +} + + +/* +** call all pending finalizers +*/ +static void callallpendingfinalizers (lua_State *L) { + global_State *g = G(L); + while (g->tobefnz) + GCTM(L); +} + + +/* +** find last 'next' field in list 'p' list (to add elements in its end) +*/ +static GCObject **findlast (GCObject **p) { + while (*p != NULL) + p = &(*p)->next; + return p; +} + + +/* +** Move all unreachable objects (or 'all' objects) that need +** finalization from list 'finobj' to list 'tobefnz' (to be finalized). +** (Note that objects after 'finobjold1' cannot be white, so they +** don't need to be traversed. In incremental mode, 'finobjold1' is NULL, +** so the whole list is traversed.) +*/ +static void separatetobefnz (global_State *g, int all) { + GCObject *curr; + GCObject **p = &g->finobj; + GCObject **lastnext = findlast(&g->tobefnz); + while ((curr = *p) != g->finobjold1) { /* traverse all finalizable objects */ + lua_assert(tofinalize(curr)); + if (!(iswhite(curr) || all)) /* not being collected? */ + p = &curr->next; /* don't bother with it */ + else { + if (curr == g->finobjsur) /* removing 'finobjsur'? */ + g->finobjsur = curr->next; /* correct it */ + *p = curr->next; /* remove 'curr' from 'finobj' list */ + curr->next = *lastnext; /* link at the end of 'tobefnz' list */ + *lastnext = curr; + lastnext = &curr->next; + } + } +} + + +/* +** If pointer 'p' points to 'o', move it to the next element. +*/ +static void checkpointer (GCObject **p, GCObject *o) { + if (o == *p) + *p = o->next; +} + + +/* +** Correct pointers to objects inside 'allgc' list when +** object 'o' is being removed from the list. +*/ +static void correctpointers (global_State *g, GCObject *o) { + checkpointer(&g->survival, o); + checkpointer(&g->old1, o); + checkpointer(&g->reallyold, o); + checkpointer(&g->firstold1, o); +} + + +/* +** if object 'o' has a finalizer, remove it from 'allgc' list (must +** search the list to find it) and link it in 'finobj' list. +*/ +void luaC_checkfinalizer (lua_State *L, GCObject *o, Table *mt) { + global_State *g = G(L); + if (tofinalize(o) || /* obj. is already marked... */ + gfasttm(g, mt, TM_GC) == NULL || /* or has no finalizer... */ + (g->gcstp & GCSTPCLS)) /* or closing state? */ + return; /* nothing to be done */ + else { /* move 'o' to 'finobj' list */ + GCObject **p; + if (issweepphase(g)) { + makewhite(g, o); /* "sweep" object 'o' */ + if (g->sweepgc == &o->next) /* should not remove 'sweepgc' object */ + g->sweepgc = sweeptolive(L, g->sweepgc); /* change 'sweepgc' */ + } + else + correctpointers(g, o); + /* search for pointer pointing to 'o' */ + for (p = &g->allgc; *p != o; p = &(*p)->next) { /* empty */ } + *p = o->next; /* remove 'o' from 'allgc' list */ + o->next = g->finobj; /* link it in 'finobj' list */ + g->finobj = o; + l_setbit(o->marked, FINALIZEDBIT); /* mark it as such */ + } +} + +/* }====================================================== */ + + +/* +** {====================================================== +** Generational Collector +** ======================================================= +*/ + + +/* +** Set the "time" to wait before starting a new GC cycle; cycle will +** start when memory use hits the threshold of ('estimate' * pause / +** PAUSEADJ). (Division by 'estimate' should be OK: it cannot be zero, +** because Lua cannot even start with less than PAUSEADJ bytes). +*/ +static void setpause (global_State *g) { + l_mem threshold, debt; + int pause = getgcparam(g->gcpause); + l_mem estimate = g->GCestimate / PAUSEADJ; /* adjust 'estimate' */ + lua_assert(estimate > 0); + threshold = (pause < MAX_LMEM / estimate) /* overflow? */ + ? estimate * pause /* no overflow */ + : MAX_LMEM; /* overflow; truncate to maximum */ + debt = gettotalbytes(g) - threshold; + if (debt > 0) debt = 0; + luaE_setdebt(g, debt); +} + + +/* +** Sweep a list of objects to enter generational mode. Deletes dead +** objects and turns the non dead to old. All non-dead threads---which +** are now old---must be in a gray list. Everything else is not in a +** gray list. Open upvalues are also kept gray. +*/ +static void sweep2old (lua_State *L, GCObject **p) { + GCObject *curr; + global_State *g = G(L); + while ((curr = *p) != NULL) { + if (iswhite(curr)) { /* is 'curr' dead? */ + lua_assert(isdead(g, curr)); + *p = curr->next; /* remove 'curr' from list */ + freeobj(L, curr); /* erase 'curr' */ + } + else { /* all surviving objects become old */ + setage(curr, G_OLD); + if (curr->tt == LUA_VTHREAD) { /* threads must be watched */ + lua_State *th = gco2th(curr); + linkgclist(th, g->grayagain); /* insert into 'grayagain' list */ + } + else if (curr->tt == LUA_VUPVAL && upisopen(gco2upv(curr))) + set2gray(curr); /* open upvalues are always gray */ + else /* everything else is black */ + nw2black(curr); + p = &curr->next; /* go to next element */ + } + } +} + + +/* +** Sweep for generational mode. Delete dead objects. (Because the +** collection is not incremental, there are no "new white" objects +** during the sweep. So, any white object must be dead.) For +** non-dead objects, advance their ages and clear the color of +** new objects. (Old objects keep their colors.) +** The ages of G_TOUCHED1 and G_TOUCHED2 objects cannot be advanced +** here, because these old-generation objects are usually not swept +** here. They will all be advanced in 'correctgraylist'. That function +** will also remove objects turned white here from any gray list. +*/ +static GCObject **sweepgen (lua_State *L, global_State *g, GCObject **p, + GCObject *limit, GCObject **pfirstold1) { + static const lu_byte nextage[] = { + G_SURVIVAL, /* from G_NEW */ + G_OLD1, /* from G_SURVIVAL */ + G_OLD1, /* from G_OLD0 */ + G_OLD, /* from G_OLD1 */ + G_OLD, /* from G_OLD (do not change) */ + G_TOUCHED1, /* from G_TOUCHED1 (do not change) */ + G_TOUCHED2 /* from G_TOUCHED2 (do not change) */ + }; + int white = luaC_white(g); + GCObject *curr; + while ((curr = *p) != limit) { + if (iswhite(curr)) { /* is 'curr' dead? */ + lua_assert(!isold(curr) && isdead(g, curr)); + *p = curr->next; /* remove 'curr' from list */ + freeobj(L, curr); /* erase 'curr' */ + } + else { /* correct mark and age */ + if (getage(curr) == G_NEW) { /* new objects go back to white */ + int marked = curr->marked & ~maskgcbits; /* erase GC bits */ + curr->marked = cast_byte(marked | G_SURVIVAL | white); + } + else { /* all other objects will be old, and so keep their color */ + setage(curr, nextage[getage(curr)]); + if (getage(curr) == G_OLD1 && *pfirstold1 == NULL) + *pfirstold1 = curr; /* first OLD1 object in the list */ + } + p = &curr->next; /* go to next element */ + } + } + return p; +} + + +/* +** Traverse a list making all its elements white and clearing their +** age. In incremental mode, all objects are 'new' all the time, +** except for fixed strings (which are always old). +*/ +static void whitelist (global_State *g, GCObject *p) { + int white = luaC_white(g); + for (; p != NULL; p = p->next) + p->marked = cast_byte((p->marked & ~maskgcbits) | white); +} + + +/* +** Correct a list of gray objects. Return pointer to where rest of the +** list should be linked. +** Because this correction is done after sweeping, young objects might +** be turned white and still be in the list. They are only removed. +** 'TOUCHED1' objects are advanced to 'TOUCHED2' and remain on the list; +** Non-white threads also remain on the list; 'TOUCHED2' objects become +** regular old; they and anything else are removed from the list. +*/ +static GCObject **correctgraylist (GCObject **p) { + GCObject *curr; + while ((curr = *p) != NULL) { + GCObject **next = getgclist(curr); + if (iswhite(curr)) + goto remove; /* remove all white objects */ + else if (getage(curr) == G_TOUCHED1) { /* touched in this cycle? */ + lua_assert(isgray(curr)); + nw2black(curr); /* make it black, for next barrier */ + changeage(curr, G_TOUCHED1, G_TOUCHED2); + goto remain; /* keep it in the list and go to next element */ + } + else if (curr->tt == LUA_VTHREAD) { + lua_assert(isgray(curr)); + goto remain; /* keep non-white threads on the list */ + } + else { /* everything else is removed */ + lua_assert(isold(curr)); /* young objects should be white here */ + if (getage(curr) == G_TOUCHED2) /* advance from TOUCHED2... */ + changeage(curr, G_TOUCHED2, G_OLD); /* ... to OLD */ + nw2black(curr); /* make object black (to be removed) */ + goto remove; + } + remove: *p = *next; continue; + remain: p = next; continue; + } + return p; +} + + +/* +** Correct all gray lists, coalescing them into 'grayagain'. +*/ +static void correctgraylists (global_State *g) { + GCObject **list = correctgraylist(&g->grayagain); + *list = g->weak; g->weak = NULL; + list = correctgraylist(list); + *list = g->allweak; g->allweak = NULL; + list = correctgraylist(list); + *list = g->ephemeron; g->ephemeron = NULL; + correctgraylist(list); +} + + +/* +** Mark black 'OLD1' objects when starting a new young collection. +** Gray objects are already in some gray list, and so will be visited +** in the atomic step. +*/ +static void markold (global_State *g, GCObject *from, GCObject *to) { + GCObject *p; + for (p = from; p != to; p = p->next) { + if (getage(p) == G_OLD1) { + lua_assert(!iswhite(p)); + changeage(p, G_OLD1, G_OLD); /* now they are old */ + if (isblack(p)) + reallymarkobject(g, p); + } + } +} + + +/* +** Finish a young-generation collection. +*/ +static void finishgencycle (lua_State *L, global_State *g) { + correctgraylists(g); + checkSizes(L, g); + g->gcstate = GCSpropagate; /* skip restart */ + if (!g->gcemergency) + callallpendingfinalizers(L); +} + + +/* +** Does a young collection. First, mark 'OLD1' objects. Then does the +** atomic step. Then, sweep all lists and advance pointers. Finally, +** finish the collection. +*/ +static void youngcollection (lua_State *L, global_State *g) { + GCObject **psurvival; /* to point to first non-dead survival object */ + GCObject *dummy; /* dummy out parameter to 'sweepgen' */ + lua_assert(g->gcstate == GCSpropagate); + if (g->firstold1) { /* are there regular OLD1 objects? */ + markold(g, g->firstold1, g->reallyold); /* mark them */ + g->firstold1 = NULL; /* no more OLD1 objects (for now) */ + } + markold(g, g->finobj, g->finobjrold); + markold(g, g->tobefnz, NULL); + atomic(L); + + /* sweep nursery and get a pointer to its last live element */ + g->gcstate = GCSswpallgc; + psurvival = sweepgen(L, g, &g->allgc, g->survival, &g->firstold1); + /* sweep 'survival' */ + sweepgen(L, g, psurvival, g->old1, &g->firstold1); + g->reallyold = g->old1; + g->old1 = *psurvival; /* 'survival' survivals are old now */ + g->survival = g->allgc; /* all news are survivals */ + + /* repeat for 'finobj' lists */ + dummy = NULL; /* no 'firstold1' optimization for 'finobj' lists */ + psurvival = sweepgen(L, g, &g->finobj, g->finobjsur, &dummy); + /* sweep 'survival' */ + sweepgen(L, g, psurvival, g->finobjold1, &dummy); + g->finobjrold = g->finobjold1; + g->finobjold1 = *psurvival; /* 'survival' survivals are old now */ + g->finobjsur = g->finobj; /* all news are survivals */ + + sweepgen(L, g, &g->tobefnz, NULL, &dummy); + finishgencycle(L, g); +} + + +/* +** Clears all gray lists, sweeps objects, and prepare sublists to enter +** generational mode. The sweeps remove dead objects and turn all +** surviving objects to old. Threads go back to 'grayagain'; everything +** else is turned black (not in any gray list). +*/ +static void atomic2gen (lua_State *L, global_State *g) { + cleargraylists(g); + /* sweep all elements making them old */ + g->gcstate = GCSswpallgc; + sweep2old(L, &g->allgc); + /* everything alive now is old */ + g->reallyold = g->old1 = g->survival = g->allgc; + g->firstold1 = NULL; /* there are no OLD1 objects anywhere */ + + /* repeat for 'finobj' lists */ + sweep2old(L, &g->finobj); + g->finobjrold = g->finobjold1 = g->finobjsur = g->finobj; + + sweep2old(L, &g->tobefnz); + + g->gckind = KGC_GEN; + g->lastatomic = 0; + g->GCestimate = gettotalbytes(g); /* base for memory control */ + finishgencycle(L, g); +} + + +/* +** Set debt for the next minor collection, which will happen when +** memory grows 'genminormul'%. +*/ +static void setminordebt (global_State *g) { + luaE_setdebt(g, -(cast(l_mem, (gettotalbytes(g) / 100)) * g->genminormul)); +} + + +/* +** Enter generational mode. Must go until the end of an atomic cycle +** to ensure that all objects are correctly marked and weak tables +** are cleared. Then, turn all objects into old and finishes the +** collection. +*/ +static lu_mem entergen (lua_State *L, global_State *g) { + lu_mem numobjs; + luaC_runtilstate(L, bitmask(GCSpause)); /* prepare to start a new cycle */ + luaC_runtilstate(L, bitmask(GCSpropagate)); /* start new cycle */ + numobjs = atomic(L); /* propagates all and then do the atomic stuff */ + atomic2gen(L, g); + setminordebt(g); /* set debt assuming next cycle will be minor */ + return numobjs; +} + + +/* +** Enter incremental mode. Turn all objects white, make all +** intermediate lists point to NULL (to avoid invalid pointers), +** and go to the pause state. +*/ +static void enterinc (global_State *g) { + whitelist(g, g->allgc); + g->reallyold = g->old1 = g->survival = NULL; + whitelist(g, g->finobj); + whitelist(g, g->tobefnz); + g->finobjrold = g->finobjold1 = g->finobjsur = NULL; + g->gcstate = GCSpause; + g->gckind = KGC_INC; + g->lastatomic = 0; +} + + +/* +** Change collector mode to 'newmode'. +*/ +void luaC_changemode (lua_State *L, int newmode) { + global_State *g = G(L); + if (newmode != g->gckind) { + if (newmode == KGC_GEN) /* entering generational mode? */ + entergen(L, g); + else + enterinc(g); /* entering incremental mode */ + } + g->lastatomic = 0; +} + + +/* +** Does a full collection in generational mode. +*/ +static lu_mem fullgen (lua_State *L, global_State *g) { + enterinc(g); + return entergen(L, g); +} + + +/* +** Does a major collection after last collection was a "bad collection". +** +** When the program is building a big structure, it allocates lots of +** memory but generates very little garbage. In those scenarios, +** the generational mode just wastes time doing small collections, and +** major collections are frequently what we call a "bad collection", a +** collection that frees too few objects. To avoid the cost of switching +** between generational mode and the incremental mode needed for full +** (major) collections, the collector tries to stay in incremental mode +** after a bad collection, and to switch back to generational mode only +** after a "good" collection (one that traverses less than 9/8 objects +** of the previous one). +** The collector must choose whether to stay in incremental mode or to +** switch back to generational mode before sweeping. At this point, it +** does not know the real memory in use, so it cannot use memory to +** decide whether to return to generational mode. Instead, it uses the +** number of objects traversed (returned by 'atomic') as a proxy. The +** field 'g->lastatomic' keeps this count from the last collection. +** ('g->lastatomic != 0' also means that the last collection was bad.) +*/ +static void stepgenfull (lua_State *L, global_State *g) { + lu_mem newatomic; /* count of traversed objects */ + lu_mem lastatomic = g->lastatomic; /* count from last collection */ + if (g->gckind == KGC_GEN) /* still in generational mode? */ + enterinc(g); /* enter incremental mode */ + luaC_runtilstate(L, bitmask(GCSpropagate)); /* start new cycle */ + newatomic = atomic(L); /* mark everybody */ + if (newatomic < lastatomic + (lastatomic >> 3)) { /* good collection? */ + atomic2gen(L, g); /* return to generational mode */ + setminordebt(g); + } + else { /* another bad collection; stay in incremental mode */ + g->GCestimate = gettotalbytes(g); /* first estimate */; + entersweep(L); + luaC_runtilstate(L, bitmask(GCSpause)); /* finish collection */ + setpause(g); + g->lastatomic = newatomic; + } +} + + +/* +** Does a generational "step". +** Usually, this means doing a minor collection and setting the debt to +** make another collection when memory grows 'genminormul'% larger. +** +** However, there are exceptions. If memory grows 'genmajormul'% +** larger than it was at the end of the last major collection (kept +** in 'g->GCestimate'), the function does a major collection. At the +** end, it checks whether the major collection was able to free a +** decent amount of memory (at least half the growth in memory since +** previous major collection). If so, the collector keeps its state, +** and the next collection will probably be minor again. Otherwise, +** we have what we call a "bad collection". In that case, set the field +** 'g->lastatomic' to signal that fact, so that the next collection will +** go to 'stepgenfull'. +** +** 'GCdebt <= 0' means an explicit call to GC step with "size" zero; +** in that case, do a minor collection. +*/ +static void genstep (lua_State *L, global_State *g) { + if (g->lastatomic != 0) /* last collection was a bad one? */ + stepgenfull(L, g); /* do a full step */ + else { + lu_mem majorbase = g->GCestimate; /* memory after last major collection */ + lu_mem majorinc = (majorbase / 100) * getgcparam(g->genmajormul); + if (g->GCdebt > 0 && gettotalbytes(g) > majorbase + majorinc) { + lu_mem numobjs = fullgen(L, g); /* do a major collection */ + if (gettotalbytes(g) < majorbase + (majorinc / 2)) { + /* collected at least half of memory growth since last major + collection; keep doing minor collections. */ + lua_assert(g->lastatomic == 0); + } + else { /* bad collection */ + g->lastatomic = numobjs; /* signal that last collection was bad */ + setpause(g); /* do a long wait for next (major) collection */ + } + } + else { /* regular case; do a minor collection */ + youngcollection(L, g); + setminordebt(g); + g->GCestimate = majorbase; /* preserve base value */ + } + } + lua_assert(isdecGCmodegen(g)); +} + +/* }====================================================== */ + + +/* +** {====================================================== +** GC control +** ======================================================= +*/ + + +/* +** Enter first sweep phase. +** The call to 'sweeptolive' makes the pointer point to an object +** inside the list (instead of to the header), so that the real sweep do +** not need to skip objects created between "now" and the start of the +** real sweep. +*/ +static void entersweep (lua_State *L) { + global_State *g = G(L); + g->gcstate = GCSswpallgc; + lua_assert(g->sweepgc == NULL); + g->sweepgc = sweeptolive(L, &g->allgc); +} + + +/* +** Delete all objects in list 'p' until (but not including) object +** 'limit'. +*/ +static void deletelist (lua_State *L, GCObject *p, GCObject *limit) { + while (p != limit) { + GCObject *next = p->next; + freeobj(L, p); + p = next; + } +} + + +/* +** Call all finalizers of the objects in the given Lua state, and +** then free all objects, except for the main thread. +*/ +void luaC_freeallobjects (lua_State *L) { + global_State *g = G(L); + g->gcstp = GCSTPCLS; /* no extra finalizers after here */ + luaC_changemode(L, KGC_INC); + separatetobefnz(g, 1); /* separate all objects with finalizers */ + lua_assert(g->finobj == NULL); + callallpendingfinalizers(L); + deletelist(L, g->allgc, obj2gco(g->mainthread)); + lua_assert(g->finobj == NULL); /* no new finalizers */ + deletelist(L, g->fixedgc, NULL); /* collect fixed objects */ + lua_assert(g->strt.nuse == 0); +} + + +static lu_mem atomic (lua_State *L) { + global_State *g = G(L); + lu_mem work = 0; + GCObject *origweak, *origall; + GCObject *grayagain = g->grayagain; /* save original list */ + g->grayagain = NULL; + lua_assert(g->ephemeron == NULL && g->weak == NULL); + lua_assert(!iswhite(g->mainthread)); + g->gcstate = GCSatomic; + markobject(g, L); /* mark running thread */ + /* registry and global metatables may be changed by API */ + markvalue(g, &g->l_registry); + markmt(g); /* mark global metatables */ + work += propagateall(g); /* empties 'gray' list */ + /* remark occasional upvalues of (maybe) dead threads */ + work += remarkupvals(g); + work += propagateall(g); /* propagate changes */ + g->gray = grayagain; + work += propagateall(g); /* traverse 'grayagain' list */ + convergeephemerons(g); + /* at this point, all strongly accessible objects are marked. */ + /* Clear values from weak tables, before checking finalizers */ + clearbyvalues(g, g->weak, NULL); + clearbyvalues(g, g->allweak, NULL); + origweak = g->weak; origall = g->allweak; + separatetobefnz(g, 0); /* separate objects to be finalized */ + work += markbeingfnz(g); /* mark objects that will be finalized */ + work += propagateall(g); /* remark, to propagate 'resurrection' */ + convergeephemerons(g); + /* at this point, all resurrected objects are marked. */ + /* remove dead objects from weak tables */ + clearbykeys(g, g->ephemeron); /* clear keys from all ephemeron tables */ + clearbykeys(g, g->allweak); /* clear keys from all 'allweak' tables */ + /* clear values from resurrected weak tables */ + clearbyvalues(g, g->weak, origweak); + clearbyvalues(g, g->allweak, origall); + luaS_clearcache(g); + g->currentwhite = cast_byte(otherwhite(g)); /* flip current white */ + lua_assert(g->gray == NULL); + return work; /* estimate of slots marked by 'atomic' */ +} + + +static int sweepstep (lua_State *L, global_State *g, + int nextstate, GCObject **nextlist) { + if (g->sweepgc) { + l_mem olddebt = g->GCdebt; + int count; + g->sweepgc = sweeplist(L, g->sweepgc, GCSWEEPMAX, &count); + g->GCestimate += g->GCdebt - olddebt; /* update estimate */ + return count; + } + else { /* enter next state */ + g->gcstate = nextstate; + g->sweepgc = nextlist; + return 0; /* no work done */ + } +} + + +static lu_mem singlestep (lua_State *L) { + global_State *g = G(L); + lu_mem work; + lua_assert(!g->gcstopem); /* collector is not reentrant */ + g->gcstopem = 1; /* no emergency collections while collecting */ + switch (g->gcstate) { + case GCSpause: { + restartcollection(g); + g->gcstate = GCSpropagate; + work = 1; + break; + } + case GCSpropagate: { + if (g->gray == NULL) { /* no more gray objects? */ + g->gcstate = GCSenteratomic; /* finish propagate phase */ + work = 0; + } + else + work = propagatemark(g); /* traverse one gray object */ + break; + } + case GCSenteratomic: { + work = atomic(L); /* work is what was traversed by 'atomic' */ + entersweep(L); + g->GCestimate = gettotalbytes(g); /* first estimate */; + break; + } + case GCSswpallgc: { /* sweep "regular" objects */ + work = sweepstep(L, g, GCSswpfinobj, &g->finobj); + break; + } + case GCSswpfinobj: { /* sweep objects with finalizers */ + work = sweepstep(L, g, GCSswptobefnz, &g->tobefnz); + break; + } + case GCSswptobefnz: { /* sweep objects to be finalized */ + work = sweepstep(L, g, GCSswpend, NULL); + break; + } + case GCSswpend: { /* finish sweeps */ + checkSizes(L, g); + g->gcstate = GCScallfin; + work = 0; + break; + } + case GCScallfin: { /* call remaining finalizers */ + if (g->tobefnz && !g->gcemergency) { + g->gcstopem = 0; /* ok collections during finalizers */ + work = runafewfinalizers(L, GCFINMAX) * GCFINALIZECOST; + } + else { /* emergency mode or no more finalizers */ + g->gcstate = GCSpause; /* finish collection */ + work = 0; + } + break; + } + default: lua_assert(0); return 0; + } + g->gcstopem = 0; + return work; +} + + +/* +** advances the garbage collector until it reaches a state allowed +** by 'statemask' +*/ +void luaC_runtilstate (lua_State *L, int statesmask) { + global_State *g = G(L); + while (!testbit(statesmask, g->gcstate)) + singlestep(L); +} + + + +/* +** Performs a basic incremental step. The debt and step size are +** converted from bytes to "units of work"; then the function loops +** running single steps until adding that many units of work or +** finishing a cycle (pause state). Finally, it sets the debt that +** controls when next step will be performed. +*/ +static void incstep (lua_State *L, global_State *g) { + int stepmul = (getgcparam(g->gcstepmul) | 1); /* avoid division by 0 */ + l_mem debt = (g->GCdebt / WORK2MEM) * stepmul; + l_mem stepsize = (g->gcstepsize <= log2maxs(l_mem)) + ? ((cast(l_mem, 1) << g->gcstepsize) / WORK2MEM) * stepmul + : MAX_LMEM; /* overflow; keep maximum value */ + do { /* repeat until pause or enough "credit" (negative debt) */ + lu_mem work = singlestep(L); /* perform one single step */ + debt -= work; + } while (debt > -stepsize && g->gcstate != GCSpause); + if (g->gcstate == GCSpause) + setpause(g); /* pause until next cycle */ + else { + debt = (debt / stepmul) * WORK2MEM; /* convert 'work units' to bytes */ + luaE_setdebt(g, debt); + } +} + +/* +** Performs a basic GC step if collector is running. (If collector is +** not running, set a reasonable debt to avoid it being called at +** every single check.) +*/ +void luaC_step (lua_State *L) { + global_State *g = G(L); + if (!gcrunning(g)) /* not running? */ + luaE_setdebt(g, -2000); + else { + if(isdecGCmodegen(g)) + genstep(L, g); + else + incstep(L, g); + } +} + + +/* +** Perform a full collection in incremental mode. +** Before running the collection, check 'keepinvariant'; if it is true, +** there may be some objects marked as black, so the collector has +** to sweep all objects to turn them back to white (as white has not +** changed, nothing will be collected). +*/ +static void fullinc (lua_State *L, global_State *g) { + if (keepinvariant(g)) /* black objects? */ + entersweep(L); /* sweep everything to turn them back to white */ + /* finish any pending sweep phase to start a new cycle */ + luaC_runtilstate(L, bitmask(GCSpause)); + luaC_runtilstate(L, bitmask(GCScallfin)); /* run up to finalizers */ + /* estimate must be correct after a full GC cycle */ + lua_assert(g->GCestimate == gettotalbytes(g)); + luaC_runtilstate(L, bitmask(GCSpause)); /* finish collection */ + setpause(g); +} + + +/* +** Performs a full GC cycle; if 'isemergency', set a flag to avoid +** some operations which could change the interpreter state in some +** unexpected ways (running finalizers and shrinking some structures). +*/ +void luaC_fullgc (lua_State *L, int isemergency) { + global_State *g = G(L); + lua_assert(!g->gcemergency); + g->gcemergency = isemergency; /* set flag */ + if (g->gckind == KGC_INC) + fullinc(L, g); + else + fullgen(L, g); + g->gcemergency = 0; +} + +/* }====================================================== */ + + diff --git a/06/lua-5.4.6/src/lgc.h b/06/lua-5.4.6/src/lgc.h new file mode 100644 index 0000000..538f6ed --- /dev/null +++ b/06/lua-5.4.6/src/lgc.h @@ -0,0 +1,202 @@ +/* +** $Id: lgc.h $ +** Garbage Collector +** See Copyright Notice in lua.h +*/ + +#ifndef lgc_h +#define lgc_h + + +#include "lobject.h" +#include "lstate.h" + +/* +** Collectable objects may have one of three colors: white, which means +** the object is not marked; gray, which means the object is marked, but +** its references may be not marked; and black, which means that the +** object and all its references are marked. The main invariant of the +** garbage collector, while marking objects, is that a black object can +** never point to a white one. Moreover, any gray object must be in a +** "gray list" (gray, grayagain, weak, allweak, ephemeron) so that it +** can be visited again before finishing the collection cycle. (Open +** upvalues are an exception to this rule.) These lists have no meaning +** when the invariant is not being enforced (e.g., sweep phase). +*/ + + +/* +** Possible states of the Garbage Collector +*/ +#define GCSpropagate 0 +#define GCSenteratomic 1 +#define GCSatomic 2 +#define GCSswpallgc 3 +#define GCSswpfinobj 4 +#define GCSswptobefnz 5 +#define GCSswpend 6 +#define GCScallfin 7 +#define GCSpause 8 + + +#define issweepphase(g) \ + (GCSswpallgc <= (g)->gcstate && (g)->gcstate <= GCSswpend) + + +/* +** macro to tell when main invariant (white objects cannot point to black +** ones) must be kept. During a collection, the sweep +** phase may break the invariant, as objects turned white may point to +** still-black objects. The invariant is restored when sweep ends and +** all objects are white again. +*/ + +#define keepinvariant(g) ((g)->gcstate <= GCSatomic) + + +/* +** some useful bit tricks +*/ +#define resetbits(x,m) ((x) &= cast_byte(~(m))) +#define setbits(x,m) ((x) |= (m)) +#define testbits(x,m) ((x) & (m)) +#define bitmask(b) (1<<(b)) +#define bit2mask(b1,b2) (bitmask(b1) | bitmask(b2)) +#define l_setbit(x,b) setbits(x, bitmask(b)) +#define resetbit(x,b) resetbits(x, bitmask(b)) +#define testbit(x,b) testbits(x, bitmask(b)) + + +/* +** Layout for bit use in 'marked' field. First three bits are +** used for object "age" in generational mode. Last bit is used +** by tests. +*/ +#define WHITE0BIT 3 /* object is white (type 0) */ +#define WHITE1BIT 4 /* object is white (type 1) */ +#define BLACKBIT 5 /* object is black */ +#define FINALIZEDBIT 6 /* object has been marked for finalization */ + +#define TESTBIT 7 + + + +#define WHITEBITS bit2mask(WHITE0BIT, WHITE1BIT) + + +#define iswhite(x) testbits((x)->marked, WHITEBITS) +#define isblack(x) testbit((x)->marked, BLACKBIT) +#define isgray(x) /* neither white nor black */ \ + (!testbits((x)->marked, WHITEBITS | bitmask(BLACKBIT))) + +#define tofinalize(x) testbit((x)->marked, FINALIZEDBIT) + +#define otherwhite(g) ((g)->currentwhite ^ WHITEBITS) +#define isdeadm(ow,m) ((m) & (ow)) +#define isdead(g,v) isdeadm(otherwhite(g), (v)->marked) + +#define changewhite(x) ((x)->marked ^= WHITEBITS) +#define nw2black(x) \ + check_exp(!iswhite(x), l_setbit((x)->marked, BLACKBIT)) + +#define luaC_white(g) cast_byte((g)->currentwhite & WHITEBITS) + + +/* object age in generational mode */ +#define G_NEW 0 /* created in current cycle */ +#define G_SURVIVAL 1 /* created in previous cycle */ +#define G_OLD0 2 /* marked old by frw. barrier in this cycle */ +#define G_OLD1 3 /* first full cycle as old */ +#define G_OLD 4 /* really old object (not to be visited) */ +#define G_TOUCHED1 5 /* old object touched this cycle */ +#define G_TOUCHED2 6 /* old object touched in previous cycle */ + +#define AGEBITS 7 /* all age bits (111) */ + +#define getage(o) ((o)->marked & AGEBITS) +#define setage(o,a) ((o)->marked = cast_byte(((o)->marked & (~AGEBITS)) | a)) +#define isold(o) (getage(o) > G_SURVIVAL) + +#define changeage(o,f,t) \ + check_exp(getage(o) == (f), (o)->marked ^= ((f)^(t))) + + +/* Default Values for GC parameters */ +#define LUAI_GENMAJORMUL 100 +#define LUAI_GENMINORMUL 20 + +/* wait memory to double before starting new cycle */ +#define LUAI_GCPAUSE 200 + +/* +** some gc parameters are stored divided by 4 to allow a maximum value +** up to 1023 in a 'lu_byte'. +*/ +#define getgcparam(p) ((p) * 4) +#define setgcparam(p,v) ((p) = (v) / 4) + +#define LUAI_GCMUL 100 + +/* how much to allocate before next GC step (log2) */ +#define LUAI_GCSTEPSIZE 13 /* 8 KB */ + + +/* +** Check whether the declared GC mode is generational. While in +** generational mode, the collector can go temporarily to incremental +** mode to improve performance. This is signaled by 'g->lastatomic != 0'. +*/ +#define isdecGCmodegen(g) (g->gckind == KGC_GEN || g->lastatomic != 0) + + +/* +** Control when GC is running: +*/ +#define GCSTPUSR 1 /* bit true when GC stopped by user */ +#define GCSTPGC 2 /* bit true when GC stopped by itself */ +#define GCSTPCLS 4 /* bit true when closing Lua state */ +#define gcrunning(g) ((g)->gcstp == 0) + + +/* +** Does one step of collection when debt becomes positive. 'pre'/'pos' +** allows some adjustments to be done only when needed. macro +** 'condchangemem' is used only for heavy tests (forcing a full +** GC cycle on every opportunity) +*/ +#define luaC_condGC(L,pre,pos) \ + { if (G(L)->GCdebt > 0) { pre; luaC_step(L); pos;}; \ + condchangemem(L,pre,pos); } + +/* more often than not, 'pre'/'pos' are empty */ +#define luaC_checkGC(L) luaC_condGC(L,(void)0,(void)0) + + +#define luaC_objbarrier(L,p,o) ( \ + (isblack(p) && iswhite(o)) ? \ + luaC_barrier_(L,obj2gco(p),obj2gco(o)) : cast_void(0)) + +#define luaC_barrier(L,p,v) ( \ + iscollectable(v) ? luaC_objbarrier(L,p,gcvalue(v)) : cast_void(0)) + +#define luaC_objbarrierback(L,p,o) ( \ + (isblack(p) && iswhite(o)) ? luaC_barrierback_(L,p) : cast_void(0)) + +#define luaC_barrierback(L,p,v) ( \ + iscollectable(v) ? luaC_objbarrierback(L, p, gcvalue(v)) : cast_void(0)) + +LUAI_FUNC void luaC_fix (lua_State *L, GCObject *o); +LUAI_FUNC void luaC_freeallobjects (lua_State *L); +LUAI_FUNC void luaC_step (lua_State *L); +LUAI_FUNC void luaC_runtilstate (lua_State *L, int statesmask); +LUAI_FUNC void luaC_fullgc (lua_State *L, int isemergency); +LUAI_FUNC GCObject *luaC_newobj (lua_State *L, int tt, size_t sz); +LUAI_FUNC GCObject *luaC_newobjdt (lua_State *L, int tt, size_t sz, + size_t offset); +LUAI_FUNC void luaC_barrier_ (lua_State *L, GCObject *o, GCObject *v); +LUAI_FUNC void luaC_barrierback_ (lua_State *L, GCObject *o); +LUAI_FUNC void luaC_checkfinalizer (lua_State *L, GCObject *o, Table *mt); +LUAI_FUNC void luaC_changemode (lua_State *L, int newmode); + + +#endif diff --git a/06/lua-5.4.6/src/linit.c b/06/lua-5.4.6/src/linit.c new file mode 100644 index 0000000..69808f8 --- /dev/null +++ b/06/lua-5.4.6/src/linit.c @@ -0,0 +1,65 @@ +/* +** $Id: linit.c $ +** Initialization of libraries for lua.c and other clients +** See Copyright Notice in lua.h +*/ + + +#define linit_c +#define LUA_LIB + +/* +** If you embed Lua in your program and need to open the standard +** libraries, call luaL_openlibs in your program. If you need a +** different set of libraries, copy this file to your project and edit +** it to suit your needs. +** +** You can also *preload* libraries, so that a later 'require' can +** open the library, which is already linked to the application. +** For that, do the following code: +** +** luaL_getsubtable(L, LUA_REGISTRYINDEX, LUA_PRELOAD_TABLE); +** lua_pushcfunction(L, luaopen_modname); +** lua_setfield(L, -2, modname); +** lua_pop(L, 1); // remove PRELOAD table +*/ + +#include "lprefix.h" + + +#include + +#include "lua.h" + +#include "lualib.h" +#include "lauxlib.h" + + +/* +** these libs are loaded by lua.c and are readily available to any Lua +** program +*/ +static const luaL_Reg loadedlibs[] = { + {LUA_GNAME, luaopen_base}, + {LUA_LOADLIBNAME, luaopen_package}, + {LUA_COLIBNAME, luaopen_coroutine}, + {LUA_TABLIBNAME, luaopen_table}, + {LUA_IOLIBNAME, luaopen_io}, + {LUA_OSLIBNAME, luaopen_os}, + {LUA_STRLIBNAME, luaopen_string}, + {LUA_MATHLIBNAME, luaopen_math}, + {LUA_UTF8LIBNAME, luaopen_utf8}, + {LUA_DBLIBNAME, luaopen_debug}, + {NULL, NULL} +}; + + +LUALIB_API void luaL_openlibs (lua_State *L) { + const luaL_Reg *lib; + /* "require" functions from 'loadedlibs' and set results to global table */ + for (lib = loadedlibs; lib->func; lib++) { + luaL_requiref(L, lib->name, lib->func, 1); + lua_pop(L, 1); /* remove lib */ + } +} + diff --git a/06/lua-5.4.6/src/liolib.c b/06/lua-5.4.6/src/liolib.c new file mode 100644 index 0000000..b08397d --- /dev/null +++ b/06/lua-5.4.6/src/liolib.c @@ -0,0 +1,828 @@ +/* +** $Id: liolib.c $ +** Standard I/O (and system) library +** See Copyright Notice in lua.h +*/ + +#define liolib_c +#define LUA_LIB + +#include "lprefix.h" + + +#include +#include +#include +#include +#include +#include + +#include "lua.h" + +#include "lauxlib.h" +#include "lualib.h" + + + + +/* +** Change this macro to accept other modes for 'fopen' besides +** the standard ones. +*/ +#if !defined(l_checkmode) + +/* accepted extensions to 'mode' in 'fopen' */ +#if !defined(L_MODEEXT) +#define L_MODEEXT "b" +#endif + +/* Check whether 'mode' matches '[rwa]%+?[L_MODEEXT]*' */ +static int l_checkmode (const char *mode) { + return (*mode != '\0' && strchr("rwa", *(mode++)) != NULL && + (*mode != '+' || ((void)(++mode), 1)) && /* skip if char is '+' */ + (strspn(mode, L_MODEEXT) == strlen(mode))); /* check extensions */ +} + +#endif + +/* +** {====================================================== +** l_popen spawns a new process connected to the current +** one through the file streams. +** ======================================================= +*/ + +#if !defined(l_popen) /* { */ + +#if defined(LUA_USE_POSIX) /* { */ + +#define l_popen(L,c,m) (fflush(NULL), popen(c,m)) +#define l_pclose(L,file) (pclose(file)) + +#elif defined(LUA_USE_WINDOWS) /* }{ */ + +#define l_popen(L,c,m) (_popen(c,m)) +#define l_pclose(L,file) (_pclose(file)) + +#if !defined(l_checkmodep) +/* Windows accepts "[rw][bt]?" as valid modes */ +#define l_checkmodep(m) ((m[0] == 'r' || m[0] == 'w') && \ + (m[1] == '\0' || ((m[1] == 'b' || m[1] == 't') && m[2] == '\0'))) +#endif + +#else /* }{ */ + +/* ISO C definitions */ +#define l_popen(L,c,m) \ + ((void)c, (void)m, \ + luaL_error(L, "'popen' not supported"), \ + (FILE*)0) +#define l_pclose(L,file) ((void)L, (void)file, -1) + +#endif /* } */ + +#endif /* } */ + + +#if !defined(l_checkmodep) +/* By default, Lua accepts only "r" or "w" as valid modes */ +#define l_checkmodep(m) ((m[0] == 'r' || m[0] == 'w') && m[1] == '\0') +#endif + +/* }====================================================== */ + + +#if !defined(l_getc) /* { */ + +#if defined(LUA_USE_POSIX) +#define l_getc(f) getc_unlocked(f) +#define l_lockfile(f) flockfile(f) +#define l_unlockfile(f) funlockfile(f) +#else +#define l_getc(f) getc(f) +#define l_lockfile(f) ((void)0) +#define l_unlockfile(f) ((void)0) +#endif + +#endif /* } */ + + +/* +** {====================================================== +** l_fseek: configuration for longer offsets +** ======================================================= +*/ + +#if !defined(l_fseek) /* { */ + +#if defined(LUA_USE_POSIX) /* { */ + +#include + +#define l_fseek(f,o,w) fseeko(f,o,w) +#define l_ftell(f) ftello(f) +#define l_seeknum off_t + +#elif defined(LUA_USE_WINDOWS) && !defined(_CRTIMP_TYPEINFO) \ + && defined(_MSC_VER) && (_MSC_VER >= 1400) /* }{ */ + +/* Windows (but not DDK) and Visual C++ 2005 or higher */ +#define l_fseek(f,o,w) _fseeki64(f,o,w) +#define l_ftell(f) _ftelli64(f) +#define l_seeknum __int64 + +#else /* }{ */ + +/* ISO C definitions */ +#define l_fseek(f,o,w) fseek(f,o,w) +#define l_ftell(f) ftell(f) +#define l_seeknum long + +#endif /* } */ + +#endif /* } */ + +/* }====================================================== */ + + + +#define IO_PREFIX "_IO_" +#define IOPREF_LEN (sizeof(IO_PREFIX)/sizeof(char) - 1) +#define IO_INPUT (IO_PREFIX "input") +#define IO_OUTPUT (IO_PREFIX "output") + + +typedef luaL_Stream LStream; + + +#define tolstream(L) ((LStream *)luaL_checkudata(L, 1, LUA_FILEHANDLE)) + +#define isclosed(p) ((p)->closef == NULL) + + +static int io_type (lua_State *L) { + LStream *p; + luaL_checkany(L, 1); + p = (LStream *)luaL_testudata(L, 1, LUA_FILEHANDLE); + if (p == NULL) + luaL_pushfail(L); /* not a file */ + else if (isclosed(p)) + lua_pushliteral(L, "closed file"); + else + lua_pushliteral(L, "file"); + return 1; +} + + +static int f_tostring (lua_State *L) { + LStream *p = tolstream(L); + if (isclosed(p)) + lua_pushliteral(L, "file (closed)"); + else + lua_pushfstring(L, "file (%p)", p->f); + return 1; +} + + +static FILE *tofile (lua_State *L) { + LStream *p = tolstream(L); + if (l_unlikely(isclosed(p))) + luaL_error(L, "attempt to use a closed file"); + lua_assert(p->f); + return p->f; +} + + +/* +** When creating file handles, always creates a 'closed' file handle +** before opening the actual file; so, if there is a memory error, the +** handle is in a consistent state. +*/ +static LStream *newprefile (lua_State *L) { + LStream *p = (LStream *)lua_newuserdatauv(L, sizeof(LStream), 0); + p->closef = NULL; /* mark file handle as 'closed' */ + luaL_setmetatable(L, LUA_FILEHANDLE); + return p; +} + + +/* +** Calls the 'close' function from a file handle. The 'volatile' avoids +** a bug in some versions of the Clang compiler (e.g., clang 3.0 for +** 32 bits). +*/ +static int aux_close (lua_State *L) { + LStream *p = tolstream(L); + volatile lua_CFunction cf = p->closef; + p->closef = NULL; /* mark stream as closed */ + return (*cf)(L); /* close it */ +} + + +static int f_close (lua_State *L) { + tofile(L); /* make sure argument is an open stream */ + return aux_close(L); +} + + +static int io_close (lua_State *L) { + if (lua_isnone(L, 1)) /* no argument? */ + lua_getfield(L, LUA_REGISTRYINDEX, IO_OUTPUT); /* use default output */ + return f_close(L); +} + + +static int f_gc (lua_State *L) { + LStream *p = tolstream(L); + if (!isclosed(p) && p->f != NULL) + aux_close(L); /* ignore closed and incompletely open files */ + return 0; +} + + +/* +** function to close regular files +*/ +static int io_fclose (lua_State *L) { + LStream *p = tolstream(L); + int res = fclose(p->f); + return luaL_fileresult(L, (res == 0), NULL); +} + + +static LStream *newfile (lua_State *L) { + LStream *p = newprefile(L); + p->f = NULL; + p->closef = &io_fclose; + return p; +} + + +static void opencheck (lua_State *L, const char *fname, const char *mode) { + LStream *p = newfile(L); + p->f = fopen(fname, mode); + if (l_unlikely(p->f == NULL)) + luaL_error(L, "cannot open file '%s' (%s)", fname, strerror(errno)); +} + + +static int io_open (lua_State *L) { + const char *filename = luaL_checkstring(L, 1); + const char *mode = luaL_optstring(L, 2, "r"); + LStream *p = newfile(L); + const char *md = mode; /* to traverse/check mode */ + luaL_argcheck(L, l_checkmode(md), 2, "invalid mode"); + p->f = fopen(filename, mode); + return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1; +} + + +/* +** function to close 'popen' files +*/ +static int io_pclose (lua_State *L) { + LStream *p = tolstream(L); + errno = 0; + return luaL_execresult(L, l_pclose(L, p->f)); +} + + +static int io_popen (lua_State *L) { + const char *filename = luaL_checkstring(L, 1); + const char *mode = luaL_optstring(L, 2, "r"); + LStream *p = newprefile(L); + luaL_argcheck(L, l_checkmodep(mode), 2, "invalid mode"); + p->f = l_popen(L, filename, mode); + p->closef = &io_pclose; + return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1; +} + + +static int io_tmpfile (lua_State *L) { + LStream *p = newfile(L); + p->f = tmpfile(); + return (p->f == NULL) ? luaL_fileresult(L, 0, NULL) : 1; +} + + +static FILE *getiofile (lua_State *L, const char *findex) { + LStream *p; + lua_getfield(L, LUA_REGISTRYINDEX, findex); + p = (LStream *)lua_touserdata(L, -1); + if (l_unlikely(isclosed(p))) + luaL_error(L, "default %s file is closed", findex + IOPREF_LEN); + return p->f; +} + + +static int g_iofile (lua_State *L, const char *f, const char *mode) { + if (!lua_isnoneornil(L, 1)) { + const char *filename = lua_tostring(L, 1); + if (filename) + opencheck(L, filename, mode); + else { + tofile(L); /* check that it's a valid file handle */ + lua_pushvalue(L, 1); + } + lua_setfield(L, LUA_REGISTRYINDEX, f); + } + /* return current value */ + lua_getfield(L, LUA_REGISTRYINDEX, f); + return 1; +} + + +static int io_input (lua_State *L) { + return g_iofile(L, IO_INPUT, "r"); +} + + +static int io_output (lua_State *L) { + return g_iofile(L, IO_OUTPUT, "w"); +} + + +static int io_readline (lua_State *L); + + +/* +** maximum number of arguments to 'f:lines'/'io.lines' (it + 3 must fit +** in the limit for upvalues of a closure) +*/ +#define MAXARGLINE 250 + +/* +** Auxiliary function to create the iteration function for 'lines'. +** The iteration function is a closure over 'io_readline', with +** the following upvalues: +** 1) The file being read (first value in the stack) +** 2) the number of arguments to read +** 3) a boolean, true iff file has to be closed when finished ('toclose') +** *) a variable number of format arguments (rest of the stack) +*/ +static void aux_lines (lua_State *L, int toclose) { + int n = lua_gettop(L) - 1; /* number of arguments to read */ + luaL_argcheck(L, n <= MAXARGLINE, MAXARGLINE + 2, "too many arguments"); + lua_pushvalue(L, 1); /* file */ + lua_pushinteger(L, n); /* number of arguments to read */ + lua_pushboolean(L, toclose); /* close/not close file when finished */ + lua_rotate(L, 2, 3); /* move the three values to their positions */ + lua_pushcclosure(L, io_readline, 3 + n); +} + + +static int f_lines (lua_State *L) { + tofile(L); /* check that it's a valid file handle */ + aux_lines(L, 0); + return 1; +} + + +/* +** Return an iteration function for 'io.lines'. If file has to be +** closed, also returns the file itself as a second result (to be +** closed as the state at the exit of a generic for). +*/ +static int io_lines (lua_State *L) { + int toclose; + if (lua_isnone(L, 1)) lua_pushnil(L); /* at least one argument */ + if (lua_isnil(L, 1)) { /* no file name? */ + lua_getfield(L, LUA_REGISTRYINDEX, IO_INPUT); /* get default input */ + lua_replace(L, 1); /* put it at index 1 */ + tofile(L); /* check that it's a valid file handle */ + toclose = 0; /* do not close it after iteration */ + } + else { /* open a new file */ + const char *filename = luaL_checkstring(L, 1); + opencheck(L, filename, "r"); + lua_replace(L, 1); /* put file at index 1 */ + toclose = 1; /* close it after iteration */ + } + aux_lines(L, toclose); /* push iteration function */ + if (toclose) { + lua_pushnil(L); /* state */ + lua_pushnil(L); /* control */ + lua_pushvalue(L, 1); /* file is the to-be-closed variable (4th result) */ + return 4; + } + else + return 1; +} + + +/* +** {====================================================== +** READ +** ======================================================= +*/ + + +/* maximum length of a numeral */ +#if !defined (L_MAXLENNUM) +#define L_MAXLENNUM 200 +#endif + + +/* auxiliary structure used by 'read_number' */ +typedef struct { + FILE *f; /* file being read */ + int c; /* current character (look ahead) */ + int n; /* number of elements in buffer 'buff' */ + char buff[L_MAXLENNUM + 1]; /* +1 for ending '\0' */ +} RN; + + +/* +** Add current char to buffer (if not out of space) and read next one +*/ +static int nextc (RN *rn) { + if (l_unlikely(rn->n >= L_MAXLENNUM)) { /* buffer overflow? */ + rn->buff[0] = '\0'; /* invalidate result */ + return 0; /* fail */ + } + else { + rn->buff[rn->n++] = rn->c; /* save current char */ + rn->c = l_getc(rn->f); /* read next one */ + return 1; + } +} + + +/* +** Accept current char if it is in 'set' (of size 2) +*/ +static int test2 (RN *rn, const char *set) { + if (rn->c == set[0] || rn->c == set[1]) + return nextc(rn); + else return 0; +} + + +/* +** Read a sequence of (hex)digits +*/ +static int readdigits (RN *rn, int hex) { + int count = 0; + while ((hex ? isxdigit(rn->c) : isdigit(rn->c)) && nextc(rn)) + count++; + return count; +} + + +/* +** Read a number: first reads a valid prefix of a numeral into a buffer. +** Then it calls 'lua_stringtonumber' to check whether the format is +** correct and to convert it to a Lua number. +*/ +static int read_number (lua_State *L, FILE *f) { + RN rn; + int count = 0; + int hex = 0; + char decp[2]; + rn.f = f; rn.n = 0; + decp[0] = lua_getlocaledecpoint(); /* get decimal point from locale */ + decp[1] = '.'; /* always accept a dot */ + l_lockfile(rn.f); + do { rn.c = l_getc(rn.f); } while (isspace(rn.c)); /* skip spaces */ + test2(&rn, "-+"); /* optional sign */ + if (test2(&rn, "00")) { + if (test2(&rn, "xX")) hex = 1; /* numeral is hexadecimal */ + else count = 1; /* count initial '0' as a valid digit */ + } + count += readdigits(&rn, hex); /* integral part */ + if (test2(&rn, decp)) /* decimal point? */ + count += readdigits(&rn, hex); /* fractional part */ + if (count > 0 && test2(&rn, (hex ? "pP" : "eE"))) { /* exponent mark? */ + test2(&rn, "-+"); /* exponent sign */ + readdigits(&rn, 0); /* exponent digits */ + } + ungetc(rn.c, rn.f); /* unread look-ahead char */ + l_unlockfile(rn.f); + rn.buff[rn.n] = '\0'; /* finish string */ + if (l_likely(lua_stringtonumber(L, rn.buff))) + return 1; /* ok, it is a valid number */ + else { /* invalid format */ + lua_pushnil(L); /* "result" to be removed */ + return 0; /* read fails */ + } +} + + +static int test_eof (lua_State *L, FILE *f) { + int c = getc(f); + ungetc(c, f); /* no-op when c == EOF */ + lua_pushliteral(L, ""); + return (c != EOF); +} + + +static int read_line (lua_State *L, FILE *f, int chop) { + luaL_Buffer b; + int c; + luaL_buffinit(L, &b); + do { /* may need to read several chunks to get whole line */ + char *buff = luaL_prepbuffer(&b); /* preallocate buffer space */ + int i = 0; + l_lockfile(f); /* no memory errors can happen inside the lock */ + while (i < LUAL_BUFFERSIZE && (c = l_getc(f)) != EOF && c != '\n') + buff[i++] = c; /* read up to end of line or buffer limit */ + l_unlockfile(f); + luaL_addsize(&b, i); + } while (c != EOF && c != '\n'); /* repeat until end of line */ + if (!chop && c == '\n') /* want a newline and have one? */ + luaL_addchar(&b, c); /* add ending newline to result */ + luaL_pushresult(&b); /* close buffer */ + /* return ok if read something (either a newline or something else) */ + return (c == '\n' || lua_rawlen(L, -1) > 0); +} + + +static void read_all (lua_State *L, FILE *f) { + size_t nr; + luaL_Buffer b; + luaL_buffinit(L, &b); + do { /* read file in chunks of LUAL_BUFFERSIZE bytes */ + char *p = luaL_prepbuffer(&b); + nr = fread(p, sizeof(char), LUAL_BUFFERSIZE, f); + luaL_addsize(&b, nr); + } while (nr == LUAL_BUFFERSIZE); + luaL_pushresult(&b); /* close buffer */ +} + + +static int read_chars (lua_State *L, FILE *f, size_t n) { + size_t nr; /* number of chars actually read */ + char *p; + luaL_Buffer b; + luaL_buffinit(L, &b); + p = luaL_prepbuffsize(&b, n); /* prepare buffer to read whole block */ + nr = fread(p, sizeof(char), n, f); /* try to read 'n' chars */ + luaL_addsize(&b, nr); + luaL_pushresult(&b); /* close buffer */ + return (nr > 0); /* true iff read something */ +} + + +static int g_read (lua_State *L, FILE *f, int first) { + int nargs = lua_gettop(L) - 1; + int n, success; + clearerr(f); + if (nargs == 0) { /* no arguments? */ + success = read_line(L, f, 1); + n = first + 1; /* to return 1 result */ + } + else { + /* ensure stack space for all results and for auxlib's buffer */ + luaL_checkstack(L, nargs+LUA_MINSTACK, "too many arguments"); + success = 1; + for (n = first; nargs-- && success; n++) { + if (lua_type(L, n) == LUA_TNUMBER) { + size_t l = (size_t)luaL_checkinteger(L, n); + success = (l == 0) ? test_eof(L, f) : read_chars(L, f, l); + } + else { + const char *p = luaL_checkstring(L, n); + if (*p == '*') p++; /* skip optional '*' (for compatibility) */ + switch (*p) { + case 'n': /* number */ + success = read_number(L, f); + break; + case 'l': /* line */ + success = read_line(L, f, 1); + break; + case 'L': /* line with end-of-line */ + success = read_line(L, f, 0); + break; + case 'a': /* file */ + read_all(L, f); /* read entire file */ + success = 1; /* always success */ + break; + default: + return luaL_argerror(L, n, "invalid format"); + } + } + } + } + if (ferror(f)) + return luaL_fileresult(L, 0, NULL); + if (!success) { + lua_pop(L, 1); /* remove last result */ + luaL_pushfail(L); /* push nil instead */ + } + return n - first; +} + + +static int io_read (lua_State *L) { + return g_read(L, getiofile(L, IO_INPUT), 1); +} + + +static int f_read (lua_State *L) { + return g_read(L, tofile(L), 2); +} + + +/* +** Iteration function for 'lines'. +*/ +static int io_readline (lua_State *L) { + LStream *p = (LStream *)lua_touserdata(L, lua_upvalueindex(1)); + int i; + int n = (int)lua_tointeger(L, lua_upvalueindex(2)); + if (isclosed(p)) /* file is already closed? */ + return luaL_error(L, "file is already closed"); + lua_settop(L , 1); + luaL_checkstack(L, n, "too many arguments"); + for (i = 1; i <= n; i++) /* push arguments to 'g_read' */ + lua_pushvalue(L, lua_upvalueindex(3 + i)); + n = g_read(L, p->f, 2); /* 'n' is number of results */ + lua_assert(n > 0); /* should return at least a nil */ + if (lua_toboolean(L, -n)) /* read at least one value? */ + return n; /* return them */ + else { /* first result is false: EOF or error */ + if (n > 1) { /* is there error information? */ + /* 2nd result is error message */ + return luaL_error(L, "%s", lua_tostring(L, -n + 1)); + } + if (lua_toboolean(L, lua_upvalueindex(3))) { /* generator created file? */ + lua_settop(L, 0); /* clear stack */ + lua_pushvalue(L, lua_upvalueindex(1)); /* push file at index 1 */ + aux_close(L); /* close it */ + } + return 0; + } +} + +/* }====================================================== */ + + +static int g_write (lua_State *L, FILE *f, int arg) { + int nargs = lua_gettop(L) - arg; + int status = 1; + for (; nargs--; arg++) { + if (lua_type(L, arg) == LUA_TNUMBER) { + /* optimization: could be done exactly as for strings */ + int len = lua_isinteger(L, arg) + ? fprintf(f, LUA_INTEGER_FMT, + (LUAI_UACINT)lua_tointeger(L, arg)) + : fprintf(f, LUA_NUMBER_FMT, + (LUAI_UACNUMBER)lua_tonumber(L, arg)); + status = status && (len > 0); + } + else { + size_t l; + const char *s = luaL_checklstring(L, arg, &l); + status = status && (fwrite(s, sizeof(char), l, f) == l); + } + } + if (l_likely(status)) + return 1; /* file handle already on stack top */ + else return luaL_fileresult(L, status, NULL); +} + + +static int io_write (lua_State *L) { + return g_write(L, getiofile(L, IO_OUTPUT), 1); +} + + +static int f_write (lua_State *L) { + FILE *f = tofile(L); + lua_pushvalue(L, 1); /* push file at the stack top (to be returned) */ + return g_write(L, f, 2); +} + + +static int f_seek (lua_State *L) { + static const int mode[] = {SEEK_SET, SEEK_CUR, SEEK_END}; + static const char *const modenames[] = {"set", "cur", "end", NULL}; + FILE *f = tofile(L); + int op = luaL_checkoption(L, 2, "cur", modenames); + lua_Integer p3 = luaL_optinteger(L, 3, 0); + l_seeknum offset = (l_seeknum)p3; + luaL_argcheck(L, (lua_Integer)offset == p3, 3, + "not an integer in proper range"); + op = l_fseek(f, offset, mode[op]); + if (l_unlikely(op)) + return luaL_fileresult(L, 0, NULL); /* error */ + else { + lua_pushinteger(L, (lua_Integer)l_ftell(f)); + return 1; + } +} + + +static int f_setvbuf (lua_State *L) { + static const int mode[] = {_IONBF, _IOFBF, _IOLBF}; + static const char *const modenames[] = {"no", "full", "line", NULL}; + FILE *f = tofile(L); + int op = luaL_checkoption(L, 2, NULL, modenames); + lua_Integer sz = luaL_optinteger(L, 3, LUAL_BUFFERSIZE); + int res = setvbuf(f, NULL, mode[op], (size_t)sz); + return luaL_fileresult(L, res == 0, NULL); +} + + + +static int io_flush (lua_State *L) { + return luaL_fileresult(L, fflush(getiofile(L, IO_OUTPUT)) == 0, NULL); +} + + +static int f_flush (lua_State *L) { + return luaL_fileresult(L, fflush(tofile(L)) == 0, NULL); +} + + +/* +** functions for 'io' library +*/ +static const luaL_Reg iolib[] = { + {"close", io_close}, + {"flush", io_flush}, + {"input", io_input}, + {"lines", io_lines}, + {"open", io_open}, + {"output", io_output}, + {"popen", io_popen}, + {"read", io_read}, + {"tmpfile", io_tmpfile}, + {"type", io_type}, + {"write", io_write}, + {NULL, NULL} +}; + + +/* +** methods for file handles +*/ +static const luaL_Reg meth[] = { + {"read", f_read}, + {"write", f_write}, + {"lines", f_lines}, + {"flush", f_flush}, + {"seek", f_seek}, + {"close", f_close}, + {"setvbuf", f_setvbuf}, + {NULL, NULL} +}; + + +/* +** metamethods for file handles +*/ +static const luaL_Reg metameth[] = { + {"__index", NULL}, /* place holder */ + {"__gc", f_gc}, + {"__close", f_gc}, + {"__tostring", f_tostring}, + {NULL, NULL} +}; + + +static void createmeta (lua_State *L) { + luaL_newmetatable(L, LUA_FILEHANDLE); /* metatable for file handles */ + luaL_setfuncs(L, metameth, 0); /* add metamethods to new metatable */ + luaL_newlibtable(L, meth); /* create method table */ + luaL_setfuncs(L, meth, 0); /* add file methods to method table */ + lua_setfield(L, -2, "__index"); /* metatable.__index = method table */ + lua_pop(L, 1); /* pop metatable */ +} + + +/* +** function to (not) close the standard files stdin, stdout, and stderr +*/ +static int io_noclose (lua_State *L) { + LStream *p = tolstream(L); + p->closef = &io_noclose; /* keep file opened */ + luaL_pushfail(L); + lua_pushliteral(L, "cannot close standard file"); + return 2; +} + + +static void createstdfile (lua_State *L, FILE *f, const char *k, + const char *fname) { + LStream *p = newprefile(L); + p->f = f; + p->closef = &io_noclose; + if (k != NULL) { + lua_pushvalue(L, -1); + lua_setfield(L, LUA_REGISTRYINDEX, k); /* add file to registry */ + } + lua_setfield(L, -2, fname); /* add file to module */ +} + + +LUAMOD_API int luaopen_io (lua_State *L) { + luaL_newlib(L, iolib); /* new module */ + createmeta(L); + /* create (and set) default files */ + createstdfile(L, stdin, IO_INPUT, "stdin"); + createstdfile(L, stdout, IO_OUTPUT, "stdout"); + createstdfile(L, stderr, NULL, "stderr"); + return 1; +} + diff --git a/06/lua-5.4.6/src/ljumptab.h b/06/lua-5.4.6/src/ljumptab.h new file mode 100644 index 0000000..8306f25 --- /dev/null +++ b/06/lua-5.4.6/src/ljumptab.h @@ -0,0 +1,112 @@ +/* +** $Id: ljumptab.h $ +** Jump Table for the Lua interpreter +** See Copyright Notice in lua.h +*/ + + +#undef vmdispatch +#undef vmcase +#undef vmbreak + +#define vmdispatch(x) goto *disptab[x]; + +#define vmcase(l) L_##l: + +#define vmbreak vmfetch(); vmdispatch(GET_OPCODE(i)); + + +static const void *const disptab[NUM_OPCODES] = { + +#if 0 +** you can update the following list with this command: +** +** sed -n '/^OP_/\!d; s/OP_/\&\&L_OP_/ ; s/,.*/,/ ; s/\/.*// ; p' lopcodes.h +** +#endif + +&&L_OP_MOVE, +&&L_OP_LOADI, +&&L_OP_LOADF, +&&L_OP_LOADK, +&&L_OP_LOADKX, +&&L_OP_LOADFALSE, +&&L_OP_LFALSESKIP, +&&L_OP_LOADTRUE, +&&L_OP_LOADNIL, +&&L_OP_GETUPVAL, +&&L_OP_SETUPVAL, +&&L_OP_GETTABUP, +&&L_OP_GETTABLE, +&&L_OP_GETI, +&&L_OP_GETFIELD, +&&L_OP_SETTABUP, +&&L_OP_SETTABLE, +&&L_OP_SETI, +&&L_OP_SETFIELD, +&&L_OP_NEWTABLE, +&&L_OP_SELF, +&&L_OP_ADDI, +&&L_OP_ADDK, +&&L_OP_SUBK, +&&L_OP_MULK, +&&L_OP_MODK, +&&L_OP_POWK, +&&L_OP_DIVK, +&&L_OP_IDIVK, +&&L_OP_BANDK, +&&L_OP_BORK, +&&L_OP_BXORK, +&&L_OP_SHRI, +&&L_OP_SHLI, +&&L_OP_ADD, +&&L_OP_SUB, +&&L_OP_MUL, +&&L_OP_MOD, +&&L_OP_POW, +&&L_OP_DIV, +&&L_OP_IDIV, +&&L_OP_BAND, +&&L_OP_BOR, +&&L_OP_BXOR, +&&L_OP_SHL, +&&L_OP_SHR, +&&L_OP_MMBIN, +&&L_OP_MMBINI, +&&L_OP_MMBINK, +&&L_OP_UNM, +&&L_OP_BNOT, +&&L_OP_NOT, +&&L_OP_LEN, +&&L_OP_CONCAT, +&&L_OP_CLOSE, +&&L_OP_TBC, +&&L_OP_JMP, +&&L_OP_EQ, +&&L_OP_LT, +&&L_OP_LE, +&&L_OP_EQK, +&&L_OP_EQI, +&&L_OP_LTI, +&&L_OP_LEI, +&&L_OP_GTI, +&&L_OP_GEI, +&&L_OP_TEST, +&&L_OP_TESTSET, +&&L_OP_CALL, +&&L_OP_TAILCALL, +&&L_OP_RETURN, +&&L_OP_RETURN0, +&&L_OP_RETURN1, +&&L_OP_FORLOOP, +&&L_OP_FORPREP, +&&L_OP_TFORPREP, +&&L_OP_TFORCALL, +&&L_OP_TFORLOOP, +&&L_OP_SETLIST, +&&L_OP_CLOSURE, +&&L_OP_VARARG, +&&L_OP_VARARGPREP, +&&L_OP_EXTRAARG + +}; diff --git a/06/lua-5.4.6/src/llex.c b/06/lua-5.4.6/src/llex.c new file mode 100644 index 0000000..5fc39a5 --- /dev/null +++ b/06/lua-5.4.6/src/llex.c @@ -0,0 +1,581 @@ +/* +** $Id: llex.c $ +** Lexical Analyzer +** See Copyright Notice in lua.h +*/ + +#define llex_c +#define LUA_CORE + +#include "lprefix.h" + + +#include +#include + +#include "lua.h" + +#include "lctype.h" +#include "ldebug.h" +#include "ldo.h" +#include "lgc.h" +#include "llex.h" +#include "lobject.h" +#include "lparser.h" +#include "lstate.h" +#include "lstring.h" +#include "ltable.h" +#include "lzio.h" + + + +#define next(ls) (ls->current = zgetc(ls->z)) + + + +#define currIsNewline(ls) (ls->current == '\n' || ls->current == '\r') + + +/* ORDER RESERVED */ +static const char *const luaX_tokens [] = { + "and", "break", "do", "else", "elseif", + "end", "false", "for", "function", "goto", "if", + "in", "local", "nil", "not", "or", "repeat", + "return", "then", "true", "until", "while", + "//", "..", "...", "==", ">=", "<=", "~=", + "<<", ">>", "::", "", + "", "", "", "" +}; + + +#define save_and_next(ls) (save(ls, ls->current), next(ls)) + + +static l_noret lexerror (LexState *ls, const char *msg, int token); + + +static void save (LexState *ls, int c) { + Mbuffer *b = ls->buff; + if (luaZ_bufflen(b) + 1 > luaZ_sizebuffer(b)) { + size_t newsize; + if (luaZ_sizebuffer(b) >= MAX_SIZE/2) + lexerror(ls, "lexical element too long", 0); + newsize = luaZ_sizebuffer(b) * 2; + luaZ_resizebuffer(ls->L, b, newsize); + } + b->buffer[luaZ_bufflen(b)++] = cast_char(c); +} + + +void luaX_init (lua_State *L) { + int i; + TString *e = luaS_newliteral(L, LUA_ENV); /* create env name */ + luaC_fix(L, obj2gco(e)); /* never collect this name */ + for (i=0; iextra = cast_byte(i+1); /* reserved word */ + } +} + + +const char *luaX_token2str (LexState *ls, int token) { + if (token < FIRST_RESERVED) { /* single-byte symbols? */ + if (lisprint(token)) + return luaO_pushfstring(ls->L, "'%c'", token); + else /* control character */ + return luaO_pushfstring(ls->L, "'<\\%d>'", token); + } + else { + const char *s = luaX_tokens[token - FIRST_RESERVED]; + if (token < TK_EOS) /* fixed format (symbols and reserved words)? */ + return luaO_pushfstring(ls->L, "'%s'", s); + else /* names, strings, and numerals */ + return s; + } +} + + +static const char *txtToken (LexState *ls, int token) { + switch (token) { + case TK_NAME: case TK_STRING: + case TK_FLT: case TK_INT: + save(ls, '\0'); + return luaO_pushfstring(ls->L, "'%s'", luaZ_buffer(ls->buff)); + default: + return luaX_token2str(ls, token); + } +} + + +static l_noret lexerror (LexState *ls, const char *msg, int token) { + msg = luaG_addinfo(ls->L, msg, ls->source, ls->linenumber); + if (token) + luaO_pushfstring(ls->L, "%s near %s", msg, txtToken(ls, token)); + luaD_throw(ls->L, LUA_ERRSYNTAX); +} + + +l_noret luaX_syntaxerror (LexState *ls, const char *msg) { + lexerror(ls, msg, ls->t.token); +} + + +/* +** Creates a new string and anchors it in scanner's table so that it +** will not be collected until the end of the compilation; by that time +** it should be anchored somewhere. It also internalizes long strings, +** ensuring there is only one copy of each unique string. The table +** here is used as a set: the string enters as the key, while its value +** is irrelevant. We use the string itself as the value only because it +** is a TValue readily available. Later, the code generation can change +** this value. +*/ +TString *luaX_newstring (LexState *ls, const char *str, size_t l) { + lua_State *L = ls->L; + TString *ts = luaS_newlstr(L, str, l); /* create new string */ + const TValue *o = luaH_getstr(ls->h, ts); + if (!ttisnil(o)) /* string already present? */ + ts = keystrval(nodefromval(o)); /* get saved copy */ + else { /* not in use yet */ + TValue *stv = s2v(L->top.p++); /* reserve stack space for string */ + setsvalue(L, stv, ts); /* temporarily anchor the string */ + luaH_finishset(L, ls->h, stv, o, stv); /* t[string] = string */ + /* table is not a metatable, so it does not need to invalidate cache */ + luaC_checkGC(L); + L->top.p--; /* remove string from stack */ + } + return ts; +} + + +/* +** increment line number and skips newline sequence (any of +** \n, \r, \n\r, or \r\n) +*/ +static void inclinenumber (LexState *ls) { + int old = ls->current; + lua_assert(currIsNewline(ls)); + next(ls); /* skip '\n' or '\r' */ + if (currIsNewline(ls) && ls->current != old) + next(ls); /* skip '\n\r' or '\r\n' */ + if (++ls->linenumber >= MAX_INT) + lexerror(ls, "chunk has too many lines", 0); +} + + +void luaX_setinput (lua_State *L, LexState *ls, ZIO *z, TString *source, + int firstchar) { + ls->t.token = 0; + ls->L = L; + ls->current = firstchar; + ls->lookahead.token = TK_EOS; /* no look-ahead token */ + ls->z = z; + ls->fs = NULL; + ls->linenumber = 1; + ls->lastline = 1; + ls->source = source; + ls->envn = luaS_newliteral(L, LUA_ENV); /* get env name */ + luaZ_resizebuffer(ls->L, ls->buff, LUA_MINBUFFER); /* initialize buffer */ +} + + + +/* +** ======================================================= +** LEXICAL ANALYZER +** ======================================================= +*/ + + +static int check_next1 (LexState *ls, int c) { + if (ls->current == c) { + next(ls); + return 1; + } + else return 0; +} + + +/* +** Check whether current char is in set 'set' (with two chars) and +** saves it +*/ +static int check_next2 (LexState *ls, const char *set) { + lua_assert(set[2] == '\0'); + if (ls->current == set[0] || ls->current == set[1]) { + save_and_next(ls); + return 1; + } + else return 0; +} + + +/* LUA_NUMBER */ +/* +** This function is quite liberal in what it accepts, as 'luaO_str2num' +** will reject ill-formed numerals. Roughly, it accepts the following +** pattern: +** +** %d(%x|%.|([Ee][+-]?))* | 0[Xx](%x|%.|([Pp][+-]?))* +** +** The only tricky part is to accept [+-] only after a valid exponent +** mark, to avoid reading '3-4' or '0xe+1' as a single number. +** +** The caller might have already read an initial dot. +*/ +static int read_numeral (LexState *ls, SemInfo *seminfo) { + TValue obj; + const char *expo = "Ee"; + int first = ls->current; + lua_assert(lisdigit(ls->current)); + save_and_next(ls); + if (first == '0' && check_next2(ls, "xX")) /* hexadecimal? */ + expo = "Pp"; + for (;;) { + if (check_next2(ls, expo)) /* exponent mark? */ + check_next2(ls, "-+"); /* optional exponent sign */ + else if (lisxdigit(ls->current) || ls->current == '.') /* '%x|%.' */ + save_and_next(ls); + else break; + } + if (lislalpha(ls->current)) /* is numeral touching a letter? */ + save_and_next(ls); /* force an error */ + save(ls, '\0'); + if (luaO_str2num(luaZ_buffer(ls->buff), &obj) == 0) /* format error? */ + lexerror(ls, "malformed number", TK_FLT); + if (ttisinteger(&obj)) { + seminfo->i = ivalue(&obj); + return TK_INT; + } + else { + lua_assert(ttisfloat(&obj)); + seminfo->r = fltvalue(&obj); + return TK_FLT; + } +} + + +/* +** read a sequence '[=*[' or ']=*]', leaving the last bracket. If +** sequence is well formed, return its number of '='s + 2; otherwise, +** return 1 if it is a single bracket (no '='s and no 2nd bracket); +** otherwise (an unfinished '[==...') return 0. +*/ +static size_t skip_sep (LexState *ls) { + size_t count = 0; + int s = ls->current; + lua_assert(s == '[' || s == ']'); + save_and_next(ls); + while (ls->current == '=') { + save_and_next(ls); + count++; + } + return (ls->current == s) ? count + 2 + : (count == 0) ? 1 + : 0; +} + + +static void read_long_string (LexState *ls, SemInfo *seminfo, size_t sep) { + int line = ls->linenumber; /* initial line (for error message) */ + save_and_next(ls); /* skip 2nd '[' */ + if (currIsNewline(ls)) /* string starts with a newline? */ + inclinenumber(ls); /* skip it */ + for (;;) { + switch (ls->current) { + case EOZ: { /* error */ + const char *what = (seminfo ? "string" : "comment"); + const char *msg = luaO_pushfstring(ls->L, + "unfinished long %s (starting at line %d)", what, line); + lexerror(ls, msg, TK_EOS); + break; /* to avoid warnings */ + } + case ']': { + if (skip_sep(ls) == sep) { + save_and_next(ls); /* skip 2nd ']' */ + goto endloop; + } + break; + } + case '\n': case '\r': { + save(ls, '\n'); + inclinenumber(ls); + if (!seminfo) luaZ_resetbuffer(ls->buff); /* avoid wasting space */ + break; + } + default: { + if (seminfo) save_and_next(ls); + else next(ls); + } + } + } endloop: + if (seminfo) + seminfo->ts = luaX_newstring(ls, luaZ_buffer(ls->buff) + sep, + luaZ_bufflen(ls->buff) - 2 * sep); +} + + +static void esccheck (LexState *ls, int c, const char *msg) { + if (!c) { + if (ls->current != EOZ) + save_and_next(ls); /* add current to buffer for error message */ + lexerror(ls, msg, TK_STRING); + } +} + + +static int gethexa (LexState *ls) { + save_and_next(ls); + esccheck (ls, lisxdigit(ls->current), "hexadecimal digit expected"); + return luaO_hexavalue(ls->current); +} + + +static int readhexaesc (LexState *ls) { + int r = gethexa(ls); + r = (r << 4) + gethexa(ls); + luaZ_buffremove(ls->buff, 2); /* remove saved chars from buffer */ + return r; +} + + +static unsigned long readutf8esc (LexState *ls) { + unsigned long r; + int i = 4; /* chars to be removed: '\', 'u', '{', and first digit */ + save_and_next(ls); /* skip 'u' */ + esccheck(ls, ls->current == '{', "missing '{'"); + r = gethexa(ls); /* must have at least one digit */ + while (cast_void(save_and_next(ls)), lisxdigit(ls->current)) { + i++; + esccheck(ls, r <= (0x7FFFFFFFu >> 4), "UTF-8 value too large"); + r = (r << 4) + luaO_hexavalue(ls->current); + } + esccheck(ls, ls->current == '}', "missing '}'"); + next(ls); /* skip '}' */ + luaZ_buffremove(ls->buff, i); /* remove saved chars from buffer */ + return r; +} + + +static void utf8esc (LexState *ls) { + char buff[UTF8BUFFSZ]; + int n = luaO_utf8esc(buff, readutf8esc(ls)); + for (; n > 0; n--) /* add 'buff' to string */ + save(ls, buff[UTF8BUFFSZ - n]); +} + + +static int readdecesc (LexState *ls) { + int i; + int r = 0; /* result accumulator */ + for (i = 0; i < 3 && lisdigit(ls->current); i++) { /* read up to 3 digits */ + r = 10*r + ls->current - '0'; + save_and_next(ls); + } + esccheck(ls, r <= UCHAR_MAX, "decimal escape too large"); + luaZ_buffremove(ls->buff, i); /* remove read digits from buffer */ + return r; +} + + +static void read_string (LexState *ls, int del, SemInfo *seminfo) { + save_and_next(ls); /* keep delimiter (for error messages) */ + while (ls->current != del) { + switch (ls->current) { + case EOZ: + lexerror(ls, "unfinished string", TK_EOS); + break; /* to avoid warnings */ + case '\n': + case '\r': + lexerror(ls, "unfinished string", TK_STRING); + break; /* to avoid warnings */ + case '\\': { /* escape sequences */ + int c; /* final character to be saved */ + save_and_next(ls); /* keep '\\' for error messages */ + switch (ls->current) { + case 'a': c = '\a'; goto read_save; + case 'b': c = '\b'; goto read_save; + case 'f': c = '\f'; goto read_save; + case 'n': c = '\n'; goto read_save; + case 'r': c = '\r'; goto read_save; + case 't': c = '\t'; goto read_save; + case 'v': c = '\v'; goto read_save; + case 'x': c = readhexaesc(ls); goto read_save; + case 'u': utf8esc(ls); goto no_save; + case '\n': case '\r': + inclinenumber(ls); c = '\n'; goto only_save; + case '\\': case '\"': case '\'': + c = ls->current; goto read_save; + case EOZ: goto no_save; /* will raise an error next loop */ + case 'z': { /* zap following span of spaces */ + luaZ_buffremove(ls->buff, 1); /* remove '\\' */ + next(ls); /* skip the 'z' */ + while (lisspace(ls->current)) { + if (currIsNewline(ls)) inclinenumber(ls); + else next(ls); + } + goto no_save; + } + default: { + esccheck(ls, lisdigit(ls->current), "invalid escape sequence"); + c = readdecesc(ls); /* digital escape '\ddd' */ + goto only_save; + } + } + read_save: + next(ls); + /* go through */ + only_save: + luaZ_buffremove(ls->buff, 1); /* remove '\\' */ + save(ls, c); + /* go through */ + no_save: break; + } + default: + save_and_next(ls); + } + } + save_and_next(ls); /* skip delimiter */ + seminfo->ts = luaX_newstring(ls, luaZ_buffer(ls->buff) + 1, + luaZ_bufflen(ls->buff) - 2); +} + + +static int llex (LexState *ls, SemInfo *seminfo) { + luaZ_resetbuffer(ls->buff); + for (;;) { + switch (ls->current) { + case '\n': case '\r': { /* line breaks */ + inclinenumber(ls); + break; + } + case ' ': case '\f': case '\t': case '\v': { /* spaces */ + next(ls); + break; + } + case '-': { /* '-' or '--' (comment) */ + next(ls); + if (ls->current != '-') return '-'; + /* else is a comment */ + next(ls); + if (ls->current == '[') { /* long comment? */ + size_t sep = skip_sep(ls); + luaZ_resetbuffer(ls->buff); /* 'skip_sep' may dirty the buffer */ + if (sep >= 2) { + read_long_string(ls, NULL, sep); /* skip long comment */ + luaZ_resetbuffer(ls->buff); /* previous call may dirty the buff. */ + break; + } + } + /* else short comment */ + while (!currIsNewline(ls) && ls->current != EOZ) + next(ls); /* skip until end of line (or end of file) */ + break; + } + case '[': { /* long string or simply '[' */ + size_t sep = skip_sep(ls); + if (sep >= 2) { + read_long_string(ls, seminfo, sep); + return TK_STRING; + } + else if (sep == 0) /* '[=...' missing second bracket? */ + lexerror(ls, "invalid long string delimiter", TK_STRING); + return '['; + } + case '=': { + next(ls); + if (check_next1(ls, '=')) return TK_EQ; /* '==' */ + else return '='; + } + case '<': { + next(ls); + if (check_next1(ls, '=')) return TK_LE; /* '<=' */ + else if (check_next1(ls, '<')) return TK_SHL; /* '<<' */ + else return '<'; + } + case '>': { + next(ls); + if (check_next1(ls, '=')) return TK_GE; /* '>=' */ + else if (check_next1(ls, '>')) return TK_SHR; /* '>>' */ + else return '>'; + } + case '/': { + next(ls); + if (check_next1(ls, '/')) return TK_IDIV; /* '//' */ + else return '/'; + } + case '~': { + next(ls); + if (check_next1(ls, '=')) return TK_NE; /* '~=' */ + else return '~'; + } + case ':': { + next(ls); + if (check_next1(ls, ':')) return TK_DBCOLON; /* '::' */ + else return ':'; + } + case '"': case '\'': { /* short literal strings */ + read_string(ls, ls->current, seminfo); + return TK_STRING; + } + case '.': { /* '.', '..', '...', or number */ + save_and_next(ls); + if (check_next1(ls, '.')) { + if (check_next1(ls, '.')) + return TK_DOTS; /* '...' */ + else return TK_CONCAT; /* '..' */ + } + else if (!lisdigit(ls->current)) return '.'; + else return read_numeral(ls, seminfo); + } + case '0': case '1': case '2': case '3': case '4': + case '5': case '6': case '7': case '8': case '9': { + return read_numeral(ls, seminfo); + } + case EOZ: { + return TK_EOS; + } + default: { + if (lislalpha(ls->current)) { /* identifier or reserved word? */ + TString *ts; + do { + save_and_next(ls); + } while (lislalnum(ls->current)); + ts = luaX_newstring(ls, luaZ_buffer(ls->buff), + luaZ_bufflen(ls->buff)); + seminfo->ts = ts; + if (isreserved(ts)) /* reserved word? */ + return ts->extra - 1 + FIRST_RESERVED; + else { + return TK_NAME; + } + } + else { /* single-char tokens ('+', '*', '%', '{', '}', ...) */ + int c = ls->current; + next(ls); + return c; + } + } + } + } +} + + +void luaX_next (LexState *ls) { + ls->lastline = ls->linenumber; + if (ls->lookahead.token != TK_EOS) { /* is there a look-ahead token? */ + ls->t = ls->lookahead; /* use this one */ + ls->lookahead.token = TK_EOS; /* and discharge it */ + } + else + ls->t.token = llex(ls, &ls->t.seminfo); /* read next token */ +} + + +int luaX_lookahead (LexState *ls) { + lua_assert(ls->lookahead.token == TK_EOS); + ls->lookahead.token = llex(ls, &ls->lookahead.seminfo); + return ls->lookahead.token; +} + diff --git a/06/lua-5.4.6/src/llex.h b/06/lua-5.4.6/src/llex.h new file mode 100644 index 0000000..389d2f8 --- /dev/null +++ b/06/lua-5.4.6/src/llex.h @@ -0,0 +1,91 @@ +/* +** $Id: llex.h $ +** Lexical Analyzer +** See Copyright Notice in lua.h +*/ + +#ifndef llex_h +#define llex_h + +#include + +#include "lobject.h" +#include "lzio.h" + + +/* +** Single-char tokens (terminal symbols) are represented by their own +** numeric code. Other tokens start at the following value. +*/ +#define FIRST_RESERVED (UCHAR_MAX + 1) + + +#if !defined(LUA_ENV) +#define LUA_ENV "_ENV" +#endif + + +/* +* WARNING: if you change the order of this enumeration, +* grep "ORDER RESERVED" +*/ +enum RESERVED { + /* terminal symbols denoted by reserved words */ + TK_AND = FIRST_RESERVED, TK_BREAK, + TK_DO, TK_ELSE, TK_ELSEIF, TK_END, TK_FALSE, TK_FOR, TK_FUNCTION, + TK_GOTO, TK_IF, TK_IN, TK_LOCAL, TK_NIL, TK_NOT, TK_OR, TK_REPEAT, + TK_RETURN, TK_THEN, TK_TRUE, TK_UNTIL, TK_WHILE, + /* other terminal symbols */ + TK_IDIV, TK_CONCAT, TK_DOTS, TK_EQ, TK_GE, TK_LE, TK_NE, + TK_SHL, TK_SHR, + TK_DBCOLON, TK_EOS, + TK_FLT, TK_INT, TK_NAME, TK_STRING +}; + +/* number of reserved words */ +#define NUM_RESERVED (cast_int(TK_WHILE-FIRST_RESERVED + 1)) + + +typedef union { + lua_Number r; + lua_Integer i; + TString *ts; +} SemInfo; /* semantics information */ + + +typedef struct Token { + int token; + SemInfo seminfo; +} Token; + + +/* state of the lexer plus state of the parser when shared by all + functions */ +typedef struct LexState { + int current; /* current character (charint) */ + int linenumber; /* input line counter */ + int lastline; /* line of last token 'consumed' */ + Token t; /* current token */ + Token lookahead; /* look ahead token */ + struct FuncState *fs; /* current function (parser) */ + struct lua_State *L; + ZIO *z; /* input stream */ + Mbuffer *buff; /* buffer for tokens */ + Table *h; /* to avoid collection/reuse strings */ + struct Dyndata *dyd; /* dynamic structures used by the parser */ + TString *source; /* current source name */ + TString *envn; /* environment variable name */ +} LexState; + + +LUAI_FUNC void luaX_init (lua_State *L); +LUAI_FUNC void luaX_setinput (lua_State *L, LexState *ls, ZIO *z, + TString *source, int firstchar); +LUAI_FUNC TString *luaX_newstring (LexState *ls, const char *str, size_t l); +LUAI_FUNC void luaX_next (LexState *ls); +LUAI_FUNC int luaX_lookahead (LexState *ls); +LUAI_FUNC l_noret luaX_syntaxerror (LexState *ls, const char *s); +LUAI_FUNC const char *luaX_token2str (LexState *ls, int token); + + +#endif diff --git a/06/lua-5.4.6/src/llimits.h b/06/lua-5.4.6/src/llimits.h new file mode 100644 index 0000000..1c826f7 --- /dev/null +++ b/06/lua-5.4.6/src/llimits.h @@ -0,0 +1,380 @@ +/* +** $Id: llimits.h $ +** Limits, basic types, and some other 'installation-dependent' definitions +** See Copyright Notice in lua.h +*/ + +#ifndef llimits_h +#define llimits_h + + +#include +#include + + +#include "lua.h" + + +/* +** 'lu_mem' and 'l_mem' are unsigned/signed integers big enough to count +** the total memory used by Lua (in bytes). Usually, 'size_t' and +** 'ptrdiff_t' should work, but we use 'long' for 16-bit machines. +*/ +#if defined(LUAI_MEM) /* { external definitions? */ +typedef LUAI_UMEM lu_mem; +typedef LUAI_MEM l_mem; +#elif LUAI_IS32INT /* }{ */ +typedef size_t lu_mem; +typedef ptrdiff_t l_mem; +#else /* 16-bit ints */ /* }{ */ +typedef unsigned long lu_mem; +typedef long l_mem; +#endif /* } */ + + +/* chars used as small naturals (so that 'char' is reserved for characters) */ +typedef unsigned char lu_byte; +typedef signed char ls_byte; + + +/* maximum value for size_t */ +#define MAX_SIZET ((size_t)(~(size_t)0)) + +/* maximum size visible for Lua (must be representable in a lua_Integer) */ +#define MAX_SIZE (sizeof(size_t) < sizeof(lua_Integer) ? MAX_SIZET \ + : (size_t)(LUA_MAXINTEGER)) + + +#define MAX_LUMEM ((lu_mem)(~(lu_mem)0)) + +#define MAX_LMEM ((l_mem)(MAX_LUMEM >> 1)) + + +#define MAX_INT INT_MAX /* maximum value of an int */ + + +/* +** floor of the log2 of the maximum signed value for integral type 't'. +** (That is, maximum 'n' such that '2^n' fits in the given signed type.) +*/ +#define log2maxs(t) (sizeof(t) * 8 - 2) + + +/* +** test whether an unsigned value is a power of 2 (or zero) +*/ +#define ispow2(x) (((x) & ((x) - 1)) == 0) + + +/* number of chars of a literal string without the ending \0 */ +#define LL(x) (sizeof(x)/sizeof(char) - 1) + + +/* +** conversion of pointer to unsigned integer: this is for hashing only; +** there is no problem if the integer cannot hold the whole pointer +** value. (In strict ISO C this may cause undefined behavior, but no +** actual machine seems to bother.) +*/ +#if !defined(LUA_USE_C89) && defined(__STDC_VERSION__) && \ + __STDC_VERSION__ >= 199901L +#include +#if defined(UINTPTR_MAX) /* even in C99 this type is optional */ +#define L_P2I uintptr_t +#else /* no 'intptr'? */ +#define L_P2I uintmax_t /* use the largest available integer */ +#endif +#else /* C89 option */ +#define L_P2I size_t +#endif + +#define point2uint(p) ((unsigned int)((L_P2I)(p) & UINT_MAX)) + + + +/* types of 'usual argument conversions' for lua_Number and lua_Integer */ +typedef LUAI_UACNUMBER l_uacNumber; +typedef LUAI_UACINT l_uacInt; + + +/* +** Internal assertions for in-house debugging +*/ +#if defined LUAI_ASSERT +#undef NDEBUG +#include +#define lua_assert(c) assert(c) +#endif + +#if defined(lua_assert) +#define check_exp(c,e) (lua_assert(c), (e)) +/* to avoid problems with conditions too long */ +#define lua_longassert(c) ((c) ? (void)0 : lua_assert(0)) +#else +#define lua_assert(c) ((void)0) +#define check_exp(c,e) (e) +#define lua_longassert(c) ((void)0) +#endif + +/* +** assertion for checking API calls +*/ +#if !defined(luai_apicheck) +#define luai_apicheck(l,e) ((void)l, lua_assert(e)) +#endif + +#define api_check(l,e,msg) luai_apicheck(l,(e) && msg) + + +/* macro to avoid warnings about unused variables */ +#if !defined(UNUSED) +#define UNUSED(x) ((void)(x)) +#endif + + +/* type casts (a macro highlights casts in the code) */ +#define cast(t, exp) ((t)(exp)) + +#define cast_void(i) cast(void, (i)) +#define cast_voidp(i) cast(void *, (i)) +#define cast_num(i) cast(lua_Number, (i)) +#define cast_int(i) cast(int, (i)) +#define cast_uint(i) cast(unsigned int, (i)) +#define cast_byte(i) cast(lu_byte, (i)) +#define cast_uchar(i) cast(unsigned char, (i)) +#define cast_char(i) cast(char, (i)) +#define cast_charp(i) cast(char *, (i)) +#define cast_sizet(i) cast(size_t, (i)) + + +/* cast a signed lua_Integer to lua_Unsigned */ +#if !defined(l_castS2U) +#define l_castS2U(i) ((lua_Unsigned)(i)) +#endif + +/* +** cast a lua_Unsigned to a signed lua_Integer; this cast is +** not strict ISO C, but two-complement architectures should +** work fine. +*/ +#if !defined(l_castU2S) +#define l_castU2S(i) ((lua_Integer)(i)) +#endif + + +/* +** non-return type +*/ +#if !defined(l_noret) + +#if defined(__GNUC__) +#define l_noret void __attribute__((noreturn)) +#elif defined(_MSC_VER) && _MSC_VER >= 1200 +#define l_noret void __declspec(noreturn) +#else +#define l_noret void +#endif + +#endif + + +/* +** Inline functions +*/ +#if !defined(LUA_USE_C89) +#define l_inline inline +#elif defined(__GNUC__) +#define l_inline __inline__ +#else +#define l_inline /* empty */ +#endif + +#define l_sinline static l_inline + + +/* +** type for virtual-machine instructions; +** must be an unsigned with (at least) 4 bytes (see details in lopcodes.h) +*/ +#if LUAI_IS32INT +typedef unsigned int l_uint32; +#else +typedef unsigned long l_uint32; +#endif + +typedef l_uint32 Instruction; + + + +/* +** Maximum length for short strings, that is, strings that are +** internalized. (Cannot be smaller than reserved words or tags for +** metamethods, as these strings must be internalized; +** #("function") = 8, #("__newindex") = 10.) +*/ +#if !defined(LUAI_MAXSHORTLEN) +#define LUAI_MAXSHORTLEN 40 +#endif + + +/* +** Initial size for the string table (must be power of 2). +** The Lua core alone registers ~50 strings (reserved words + +** metaevent keys + a few others). Libraries would typically add +** a few dozens more. +*/ +#if !defined(MINSTRTABSIZE) +#define MINSTRTABSIZE 128 +#endif + + +/* +** Size of cache for strings in the API. 'N' is the number of +** sets (better be a prime) and "M" is the size of each set (M == 1 +** makes a direct cache.) +*/ +#if !defined(STRCACHE_N) +#define STRCACHE_N 53 +#define STRCACHE_M 2 +#endif + + +/* minimum size for string buffer */ +#if !defined(LUA_MINBUFFER) +#define LUA_MINBUFFER 32 +#endif + + +/* +** Maximum depth for nested C calls, syntactical nested non-terminals, +** and other features implemented through recursion in C. (Value must +** fit in a 16-bit unsigned integer. It must also be compatible with +** the size of the C stack.) +*/ +#if !defined(LUAI_MAXCCALLS) +#define LUAI_MAXCCALLS 200 +#endif + + +/* +** macros that are executed whenever program enters the Lua core +** ('lua_lock') and leaves the core ('lua_unlock') +*/ +#if !defined(lua_lock) +#define lua_lock(L) ((void) 0) +#define lua_unlock(L) ((void) 0) +#endif + +/* +** macro executed during Lua functions at points where the +** function can yield. +*/ +#if !defined(luai_threadyield) +#define luai_threadyield(L) {lua_unlock(L); lua_lock(L);} +#endif + + +/* +** these macros allow user-specific actions when a thread is +** created/deleted/resumed/yielded. +*/ +#if !defined(luai_userstateopen) +#define luai_userstateopen(L) ((void)L) +#endif + +#if !defined(luai_userstateclose) +#define luai_userstateclose(L) ((void)L) +#endif + +#if !defined(luai_userstatethread) +#define luai_userstatethread(L,L1) ((void)L) +#endif + +#if !defined(luai_userstatefree) +#define luai_userstatefree(L,L1) ((void)L) +#endif + +#if !defined(luai_userstateresume) +#define luai_userstateresume(L,n) ((void)L) +#endif + +#if !defined(luai_userstateyield) +#define luai_userstateyield(L,n) ((void)L) +#endif + + + +/* +** The luai_num* macros define the primitive operations over numbers. +*/ + +/* floor division (defined as 'floor(a/b)') */ +#if !defined(luai_numidiv) +#define luai_numidiv(L,a,b) ((void)L, l_floor(luai_numdiv(L,a,b))) +#endif + +/* float division */ +#if !defined(luai_numdiv) +#define luai_numdiv(L,a,b) ((a)/(b)) +#endif + +/* +** modulo: defined as 'a - floor(a/b)*b'; the direct computation +** using this definition has several problems with rounding errors, +** so it is better to use 'fmod'. 'fmod' gives the result of +** 'a - trunc(a/b)*b', and therefore must be corrected when +** 'trunc(a/b) ~= floor(a/b)'. That happens when the division has a +** non-integer negative result: non-integer result is equivalent to +** a non-zero remainder 'm'; negative result is equivalent to 'a' and +** 'b' with different signs, or 'm' and 'b' with different signs +** (as the result 'm' of 'fmod' has the same sign of 'a'). +*/ +#if !defined(luai_nummod) +#define luai_nummod(L,a,b,m) \ + { (void)L; (m) = l_mathop(fmod)(a,b); \ + if (((m) > 0) ? (b) < 0 : ((m) < 0 && (b) > 0)) (m) += (b); } +#endif + +/* exponentiation */ +#if !defined(luai_numpow) +#define luai_numpow(L,a,b) \ + ((void)L, (b == 2) ? (a)*(a) : l_mathop(pow)(a,b)) +#endif + +/* the others are quite standard operations */ +#if !defined(luai_numadd) +#define luai_numadd(L,a,b) ((a)+(b)) +#define luai_numsub(L,a,b) ((a)-(b)) +#define luai_nummul(L,a,b) ((a)*(b)) +#define luai_numunm(L,a) (-(a)) +#define luai_numeq(a,b) ((a)==(b)) +#define luai_numlt(a,b) ((a)<(b)) +#define luai_numle(a,b) ((a)<=(b)) +#define luai_numgt(a,b) ((a)>(b)) +#define luai_numge(a,b) ((a)>=(b)) +#define luai_numisnan(a) (!luai_numeq((a), (a))) +#endif + + + + + +/* +** macro to control inclusion of some hard tests on stack reallocation +*/ +#if !defined(HARDSTACKTESTS) +#define condmovestack(L,pre,pos) ((void)0) +#else +/* realloc stack keeping its size */ +#define condmovestack(L,pre,pos) \ + { int sz_ = stacksize(L); pre; luaD_reallocstack((L), sz_, 0); pos; } +#endif + +#if !defined(HARDMEMTESTS) +#define condchangemem(L,pre,pos) ((void)0) +#else +#define condchangemem(L,pre,pos) \ + { if (gcrunning(G(L))) { pre; luaC_fullgc(L, 0); pos; } } +#endif + +#endif diff --git a/06/lua-5.4.6/src/lmathlib.c b/06/lua-5.4.6/src/lmathlib.c new file mode 100644 index 0000000..d0b1e1e --- /dev/null +++ b/06/lua-5.4.6/src/lmathlib.c @@ -0,0 +1,764 @@ +/* +** $Id: lmathlib.c $ +** Standard mathematical library +** See Copyright Notice in lua.h +*/ + +#define lmathlib_c +#define LUA_LIB + +#include "lprefix.h" + + +#include +#include +#include +#include +#include + +#include "lua.h" + +#include "lauxlib.h" +#include "lualib.h" + + +#undef PI +#define PI (l_mathop(3.141592653589793238462643383279502884)) + + +static int math_abs (lua_State *L) { + if (lua_isinteger(L, 1)) { + lua_Integer n = lua_tointeger(L, 1); + if (n < 0) n = (lua_Integer)(0u - (lua_Unsigned)n); + lua_pushinteger(L, n); + } + else + lua_pushnumber(L, l_mathop(fabs)(luaL_checknumber(L, 1))); + return 1; +} + +static int math_sin (lua_State *L) { + lua_pushnumber(L, l_mathop(sin)(luaL_checknumber(L, 1))); + return 1; +} + +static int math_cos (lua_State *L) { + lua_pushnumber(L, l_mathop(cos)(luaL_checknumber(L, 1))); + return 1; +} + +static int math_tan (lua_State *L) { + lua_pushnumber(L, l_mathop(tan)(luaL_checknumber(L, 1))); + return 1; +} + +static int math_asin (lua_State *L) { + lua_pushnumber(L, l_mathop(asin)(luaL_checknumber(L, 1))); + return 1; +} + +static int math_acos (lua_State *L) { + lua_pushnumber(L, l_mathop(acos)(luaL_checknumber(L, 1))); + return 1; +} + +static int math_atan (lua_State *L) { + lua_Number y = luaL_checknumber(L, 1); + lua_Number x = luaL_optnumber(L, 2, 1); + lua_pushnumber(L, l_mathop(atan2)(y, x)); + return 1; +} + + +static int math_toint (lua_State *L) { + int valid; + lua_Integer n = lua_tointegerx(L, 1, &valid); + if (l_likely(valid)) + lua_pushinteger(L, n); + else { + luaL_checkany(L, 1); + luaL_pushfail(L); /* value is not convertible to integer */ + } + return 1; +} + + +static void pushnumint (lua_State *L, lua_Number d) { + lua_Integer n; + if (lua_numbertointeger(d, &n)) /* does 'd' fit in an integer? */ + lua_pushinteger(L, n); /* result is integer */ + else + lua_pushnumber(L, d); /* result is float */ +} + + +static int math_floor (lua_State *L) { + if (lua_isinteger(L, 1)) + lua_settop(L, 1); /* integer is its own floor */ + else { + lua_Number d = l_mathop(floor)(luaL_checknumber(L, 1)); + pushnumint(L, d); + } + return 1; +} + + +static int math_ceil (lua_State *L) { + if (lua_isinteger(L, 1)) + lua_settop(L, 1); /* integer is its own ceil */ + else { + lua_Number d = l_mathop(ceil)(luaL_checknumber(L, 1)); + pushnumint(L, d); + } + return 1; +} + + +static int math_fmod (lua_State *L) { + if (lua_isinteger(L, 1) && lua_isinteger(L, 2)) { + lua_Integer d = lua_tointeger(L, 2); + if ((lua_Unsigned)d + 1u <= 1u) { /* special cases: -1 or 0 */ + luaL_argcheck(L, d != 0, 2, "zero"); + lua_pushinteger(L, 0); /* avoid overflow with 0x80000... / -1 */ + } + else + lua_pushinteger(L, lua_tointeger(L, 1) % d); + } + else + lua_pushnumber(L, l_mathop(fmod)(luaL_checknumber(L, 1), + luaL_checknumber(L, 2))); + return 1; +} + + +/* +** next function does not use 'modf', avoiding problems with 'double*' +** (which is not compatible with 'float*') when lua_Number is not +** 'double'. +*/ +static int math_modf (lua_State *L) { + if (lua_isinteger(L ,1)) { + lua_settop(L, 1); /* number is its own integer part */ + lua_pushnumber(L, 0); /* no fractional part */ + } + else { + lua_Number n = luaL_checknumber(L, 1); + /* integer part (rounds toward zero) */ + lua_Number ip = (n < 0) ? l_mathop(ceil)(n) : l_mathop(floor)(n); + pushnumint(L, ip); + /* fractional part (test needed for inf/-inf) */ + lua_pushnumber(L, (n == ip) ? l_mathop(0.0) : (n - ip)); + } + return 2; +} + + +static int math_sqrt (lua_State *L) { + lua_pushnumber(L, l_mathop(sqrt)(luaL_checknumber(L, 1))); + return 1; +} + + +static int math_ult (lua_State *L) { + lua_Integer a = luaL_checkinteger(L, 1); + lua_Integer b = luaL_checkinteger(L, 2); + lua_pushboolean(L, (lua_Unsigned)a < (lua_Unsigned)b); + return 1; +} + +static int math_log (lua_State *L) { + lua_Number x = luaL_checknumber(L, 1); + lua_Number res; + if (lua_isnoneornil(L, 2)) + res = l_mathop(log)(x); + else { + lua_Number base = luaL_checknumber(L, 2); +#if !defined(LUA_USE_C89) + if (base == l_mathop(2.0)) + res = l_mathop(log2)(x); + else +#endif + if (base == l_mathop(10.0)) + res = l_mathop(log10)(x); + else + res = l_mathop(log)(x)/l_mathop(log)(base); + } + lua_pushnumber(L, res); + return 1; +} + +static int math_exp (lua_State *L) { + lua_pushnumber(L, l_mathop(exp)(luaL_checknumber(L, 1))); + return 1; +} + +static int math_deg (lua_State *L) { + lua_pushnumber(L, luaL_checknumber(L, 1) * (l_mathop(180.0) / PI)); + return 1; +} + +static int math_rad (lua_State *L) { + lua_pushnumber(L, luaL_checknumber(L, 1) * (PI / l_mathop(180.0))); + return 1; +} + + +static int math_min (lua_State *L) { + int n = lua_gettop(L); /* number of arguments */ + int imin = 1; /* index of current minimum value */ + int i; + luaL_argcheck(L, n >= 1, 1, "value expected"); + for (i = 2; i <= n; i++) { + if (lua_compare(L, i, imin, LUA_OPLT)) + imin = i; + } + lua_pushvalue(L, imin); + return 1; +} + + +static int math_max (lua_State *L) { + int n = lua_gettop(L); /* number of arguments */ + int imax = 1; /* index of current maximum value */ + int i; + luaL_argcheck(L, n >= 1, 1, "value expected"); + for (i = 2; i <= n; i++) { + if (lua_compare(L, imax, i, LUA_OPLT)) + imax = i; + } + lua_pushvalue(L, imax); + return 1; +} + + +static int math_type (lua_State *L) { + if (lua_type(L, 1) == LUA_TNUMBER) + lua_pushstring(L, (lua_isinteger(L, 1)) ? "integer" : "float"); + else { + luaL_checkany(L, 1); + luaL_pushfail(L); + } + return 1; +} + + + +/* +** {================================================================== +** Pseudo-Random Number Generator based on 'xoshiro256**'. +** =================================================================== +*/ + +/* number of binary digits in the mantissa of a float */ +#define FIGS l_floatatt(MANT_DIG) + +#if FIGS > 64 +/* there are only 64 random bits; use them all */ +#undef FIGS +#define FIGS 64 +#endif + + +/* +** LUA_RAND32 forces the use of 32-bit integers in the implementation +** of the PRN generator (mainly for testing). +*/ +#if !defined(LUA_RAND32) && !defined(Rand64) + +/* try to find an integer type with at least 64 bits */ + +#if ((ULONG_MAX >> 31) >> 31) >= 3 + +/* 'long' has at least 64 bits */ +#define Rand64 unsigned long + +#elif !defined(LUA_USE_C89) && defined(LLONG_MAX) + +/* there is a 'long long' type (which must have at least 64 bits) */ +#define Rand64 unsigned long long + +#elif ((LUA_MAXUNSIGNED >> 31) >> 31) >= 3 + +/* 'lua_Unsigned' has at least 64 bits */ +#define Rand64 lua_Unsigned + +#endif + +#endif + + +#if defined(Rand64) /* { */ + +/* +** Standard implementation, using 64-bit integers. +** If 'Rand64' has more than 64 bits, the extra bits do not interfere +** with the 64 initial bits, except in a right shift. Moreover, the +** final result has to discard the extra bits. +*/ + +/* avoid using extra bits when needed */ +#define trim64(x) ((x) & 0xffffffffffffffffu) + + +/* rotate left 'x' by 'n' bits */ +static Rand64 rotl (Rand64 x, int n) { + return (x << n) | (trim64(x) >> (64 - n)); +} + +static Rand64 nextrand (Rand64 *state) { + Rand64 state0 = state[0]; + Rand64 state1 = state[1]; + Rand64 state2 = state[2] ^ state0; + Rand64 state3 = state[3] ^ state1; + Rand64 res = rotl(state1 * 5, 7) * 9; + state[0] = state0 ^ state3; + state[1] = state1 ^ state2; + state[2] = state2 ^ (state1 << 17); + state[3] = rotl(state3, 45); + return res; +} + + +/* must take care to not shift stuff by more than 63 slots */ + + +/* +** Convert bits from a random integer into a float in the +** interval [0,1), getting the higher FIG bits from the +** random unsigned integer and converting that to a float. +*/ + +/* must throw out the extra (64 - FIGS) bits */ +#define shift64_FIG (64 - FIGS) + +/* to scale to [0, 1), multiply by scaleFIG = 2^(-FIGS) */ +#define scaleFIG (l_mathop(0.5) / ((Rand64)1 << (FIGS - 1))) + +static lua_Number I2d (Rand64 x) { + return (lua_Number)(trim64(x) >> shift64_FIG) * scaleFIG; +} + +/* convert a 'Rand64' to a 'lua_Unsigned' */ +#define I2UInt(x) ((lua_Unsigned)trim64(x)) + +/* convert a 'lua_Unsigned' to a 'Rand64' */ +#define Int2I(x) ((Rand64)(x)) + + +#else /* no 'Rand64' }{ */ + +/* get an integer with at least 32 bits */ +#if LUAI_IS32INT +typedef unsigned int lu_int32; +#else +typedef unsigned long lu_int32; +#endif + + +/* +** Use two 32-bit integers to represent a 64-bit quantity. +*/ +typedef struct Rand64 { + lu_int32 h; /* higher half */ + lu_int32 l; /* lower half */ +} Rand64; + + +/* +** If 'lu_int32' has more than 32 bits, the extra bits do not interfere +** with the 32 initial bits, except in a right shift and comparisons. +** Moreover, the final result has to discard the extra bits. +*/ + +/* avoid using extra bits when needed */ +#define trim32(x) ((x) & 0xffffffffu) + + +/* +** basic operations on 'Rand64' values +*/ + +/* build a new Rand64 value */ +static Rand64 packI (lu_int32 h, lu_int32 l) { + Rand64 result; + result.h = h; + result.l = l; + return result; +} + +/* return i << n */ +static Rand64 Ishl (Rand64 i, int n) { + lua_assert(n > 0 && n < 32); + return packI((i.h << n) | (trim32(i.l) >> (32 - n)), i.l << n); +} + +/* i1 ^= i2 */ +static void Ixor (Rand64 *i1, Rand64 i2) { + i1->h ^= i2.h; + i1->l ^= i2.l; +} + +/* return i1 + i2 */ +static Rand64 Iadd (Rand64 i1, Rand64 i2) { + Rand64 result = packI(i1.h + i2.h, i1.l + i2.l); + if (trim32(result.l) < trim32(i1.l)) /* carry? */ + result.h++; + return result; +} + +/* return i * 5 */ +static Rand64 times5 (Rand64 i) { + return Iadd(Ishl(i, 2), i); /* i * 5 == (i << 2) + i */ +} + +/* return i * 9 */ +static Rand64 times9 (Rand64 i) { + return Iadd(Ishl(i, 3), i); /* i * 9 == (i << 3) + i */ +} + +/* return 'i' rotated left 'n' bits */ +static Rand64 rotl (Rand64 i, int n) { + lua_assert(n > 0 && n < 32); + return packI((i.h << n) | (trim32(i.l) >> (32 - n)), + (trim32(i.h) >> (32 - n)) | (i.l << n)); +} + +/* for offsets larger than 32, rotate right by 64 - offset */ +static Rand64 rotl1 (Rand64 i, int n) { + lua_assert(n > 32 && n < 64); + n = 64 - n; + return packI((trim32(i.h) >> n) | (i.l << (32 - n)), + (i.h << (32 - n)) | (trim32(i.l) >> n)); +} + +/* +** implementation of 'xoshiro256**' algorithm on 'Rand64' values +*/ +static Rand64 nextrand (Rand64 *state) { + Rand64 res = times9(rotl(times5(state[1]), 7)); + Rand64 t = Ishl(state[1], 17); + Ixor(&state[2], state[0]); + Ixor(&state[3], state[1]); + Ixor(&state[1], state[2]); + Ixor(&state[0], state[3]); + Ixor(&state[2], t); + state[3] = rotl1(state[3], 45); + return res; +} + + +/* +** Converts a 'Rand64' into a float. +*/ + +/* an unsigned 1 with proper type */ +#define UONE ((lu_int32)1) + + +#if FIGS <= 32 + +/* 2^(-FIGS) */ +#define scaleFIG (l_mathop(0.5) / (UONE << (FIGS - 1))) + +/* +** get up to 32 bits from higher half, shifting right to +** throw out the extra bits. +*/ +static lua_Number I2d (Rand64 x) { + lua_Number h = (lua_Number)(trim32(x.h) >> (32 - FIGS)); + return h * scaleFIG; +} + +#else /* 32 < FIGS <= 64 */ + +/* must take care to not shift stuff by more than 31 slots */ + +/* 2^(-FIGS) = 1.0 / 2^30 / 2^3 / 2^(FIGS-33) */ +#define scaleFIG \ + (l_mathop(1.0) / (UONE << 30) / l_mathop(8.0) / (UONE << (FIGS - 33))) + +/* +** use FIGS - 32 bits from lower half, throwing out the other +** (32 - (FIGS - 32)) = (64 - FIGS) bits +*/ +#define shiftLOW (64 - FIGS) + +/* +** higher 32 bits go after those (FIGS - 32) bits: shiftHI = 2^(FIGS - 32) +*/ +#define shiftHI ((lua_Number)(UONE << (FIGS - 33)) * l_mathop(2.0)) + + +static lua_Number I2d (Rand64 x) { + lua_Number h = (lua_Number)trim32(x.h) * shiftHI; + lua_Number l = (lua_Number)(trim32(x.l) >> shiftLOW); + return (h + l) * scaleFIG; +} + +#endif + + +/* convert a 'Rand64' to a 'lua_Unsigned' */ +static lua_Unsigned I2UInt (Rand64 x) { + return (((lua_Unsigned)trim32(x.h) << 31) << 1) | (lua_Unsigned)trim32(x.l); +} + +/* convert a 'lua_Unsigned' to a 'Rand64' */ +static Rand64 Int2I (lua_Unsigned n) { + return packI((lu_int32)((n >> 31) >> 1), (lu_int32)n); +} + +#endif /* } */ + + +/* +** A state uses four 'Rand64' values. +*/ +typedef struct { + Rand64 s[4]; +} RanState; + + +/* +** Project the random integer 'ran' into the interval [0, n]. +** Because 'ran' has 2^B possible values, the projection can only be +** uniform when the size of the interval is a power of 2 (exact +** division). Otherwise, to get a uniform projection into [0, n], we +** first compute 'lim', the smallest Mersenne number not smaller than +** 'n'. We then project 'ran' into the interval [0, lim]. If the result +** is inside [0, n], we are done. Otherwise, we try with another 'ran', +** until we have a result inside the interval. +*/ +static lua_Unsigned project (lua_Unsigned ran, lua_Unsigned n, + RanState *state) { + if ((n & (n + 1)) == 0) /* is 'n + 1' a power of 2? */ + return ran & n; /* no bias */ + else { + lua_Unsigned lim = n; + /* compute the smallest (2^b - 1) not smaller than 'n' */ + lim |= (lim >> 1); + lim |= (lim >> 2); + lim |= (lim >> 4); + lim |= (lim >> 8); + lim |= (lim >> 16); +#if (LUA_MAXUNSIGNED >> 31) >= 3 + lim |= (lim >> 32); /* integer type has more than 32 bits */ +#endif + lua_assert((lim & (lim + 1)) == 0 /* 'lim + 1' is a power of 2, */ + && lim >= n /* not smaller than 'n', */ + && (lim >> 1) < n); /* and it is the smallest one */ + while ((ran &= lim) > n) /* project 'ran' into [0..lim] */ + ran = I2UInt(nextrand(state->s)); /* not inside [0..n]? try again */ + return ran; + } +} + + +static int math_random (lua_State *L) { + lua_Integer low, up; + lua_Unsigned p; + RanState *state = (RanState *)lua_touserdata(L, lua_upvalueindex(1)); + Rand64 rv = nextrand(state->s); /* next pseudo-random value */ + switch (lua_gettop(L)) { /* check number of arguments */ + case 0: { /* no arguments */ + lua_pushnumber(L, I2d(rv)); /* float between 0 and 1 */ + return 1; + } + case 1: { /* only upper limit */ + low = 1; + up = luaL_checkinteger(L, 1); + if (up == 0) { /* single 0 as argument? */ + lua_pushinteger(L, I2UInt(rv)); /* full random integer */ + return 1; + } + break; + } + case 2: { /* lower and upper limits */ + low = luaL_checkinteger(L, 1); + up = luaL_checkinteger(L, 2); + break; + } + default: return luaL_error(L, "wrong number of arguments"); + } + /* random integer in the interval [low, up] */ + luaL_argcheck(L, low <= up, 1, "interval is empty"); + /* project random integer into the interval [0, up - low] */ + p = project(I2UInt(rv), (lua_Unsigned)up - (lua_Unsigned)low, state); + lua_pushinteger(L, p + (lua_Unsigned)low); + return 1; +} + + +static void setseed (lua_State *L, Rand64 *state, + lua_Unsigned n1, lua_Unsigned n2) { + int i; + state[0] = Int2I(n1); + state[1] = Int2I(0xff); /* avoid a zero state */ + state[2] = Int2I(n2); + state[3] = Int2I(0); + for (i = 0; i < 16; i++) + nextrand(state); /* discard initial values to "spread" seed */ + lua_pushinteger(L, n1); + lua_pushinteger(L, n2); +} + + +/* +** Set a "random" seed. To get some randomness, use the current time +** and the address of 'L' (in case the machine does address space layout +** randomization). +*/ +static void randseed (lua_State *L, RanState *state) { + lua_Unsigned seed1 = (lua_Unsigned)time(NULL); + lua_Unsigned seed2 = (lua_Unsigned)(size_t)L; + setseed(L, state->s, seed1, seed2); +} + + +static int math_randomseed (lua_State *L) { + RanState *state = (RanState *)lua_touserdata(L, lua_upvalueindex(1)); + if (lua_isnone(L, 1)) { + randseed(L, state); + } + else { + lua_Integer n1 = luaL_checkinteger(L, 1); + lua_Integer n2 = luaL_optinteger(L, 2, 0); + setseed(L, state->s, n1, n2); + } + return 2; /* return seeds */ +} + + +static const luaL_Reg randfuncs[] = { + {"random", math_random}, + {"randomseed", math_randomseed}, + {NULL, NULL} +}; + + +/* +** Register the random functions and initialize their state. +*/ +static void setrandfunc (lua_State *L) { + RanState *state = (RanState *)lua_newuserdatauv(L, sizeof(RanState), 0); + randseed(L, state); /* initialize with a "random" seed */ + lua_pop(L, 2); /* remove pushed seeds */ + luaL_setfuncs(L, randfuncs, 1); +} + +/* }================================================================== */ + + +/* +** {================================================================== +** Deprecated functions (for compatibility only) +** =================================================================== +*/ +#if defined(LUA_COMPAT_MATHLIB) + +static int math_cosh (lua_State *L) { + lua_pushnumber(L, l_mathop(cosh)(luaL_checknumber(L, 1))); + return 1; +} + +static int math_sinh (lua_State *L) { + lua_pushnumber(L, l_mathop(sinh)(luaL_checknumber(L, 1))); + return 1; +} + +static int math_tanh (lua_State *L) { + lua_pushnumber(L, l_mathop(tanh)(luaL_checknumber(L, 1))); + return 1; +} + +static int math_pow (lua_State *L) { + lua_Number x = luaL_checknumber(L, 1); + lua_Number y = luaL_checknumber(L, 2); + lua_pushnumber(L, l_mathop(pow)(x, y)); + return 1; +} + +static int math_frexp (lua_State *L) { + int e; + lua_pushnumber(L, l_mathop(frexp)(luaL_checknumber(L, 1), &e)); + lua_pushinteger(L, e); + return 2; +} + +static int math_ldexp (lua_State *L) { + lua_Number x = luaL_checknumber(L, 1); + int ep = (int)luaL_checkinteger(L, 2); + lua_pushnumber(L, l_mathop(ldexp)(x, ep)); + return 1; +} + +static int math_log10 (lua_State *L) { + lua_pushnumber(L, l_mathop(log10)(luaL_checknumber(L, 1))); + return 1; +} + +#endif +/* }================================================================== */ + + + +static const luaL_Reg mathlib[] = { + {"abs", math_abs}, + {"acos", math_acos}, + {"asin", math_asin}, + {"atan", math_atan}, + {"ceil", math_ceil}, + {"cos", math_cos}, + {"deg", math_deg}, + {"exp", math_exp}, + {"tointeger", math_toint}, + {"floor", math_floor}, + {"fmod", math_fmod}, + {"ult", math_ult}, + {"log", math_log}, + {"max", math_max}, + {"min", math_min}, + {"modf", math_modf}, + {"rad", math_rad}, + {"sin", math_sin}, + {"sqrt", math_sqrt}, + {"tan", math_tan}, + {"type", math_type}, +#if defined(LUA_COMPAT_MATHLIB) + {"atan2", math_atan}, + {"cosh", math_cosh}, + {"sinh", math_sinh}, + {"tanh", math_tanh}, + {"pow", math_pow}, + {"frexp", math_frexp}, + {"ldexp", math_ldexp}, + {"log10", math_log10}, +#endif + /* placeholders */ + {"random", NULL}, + {"randomseed", NULL}, + {"pi", NULL}, + {"huge", NULL}, + {"maxinteger", NULL}, + {"mininteger", NULL}, + {NULL, NULL} +}; + + +/* +** Open math library +*/ +LUAMOD_API int luaopen_math (lua_State *L) { + luaL_newlib(L, mathlib); + lua_pushnumber(L, PI); + lua_setfield(L, -2, "pi"); + lua_pushnumber(L, (lua_Number)HUGE_VAL); + lua_setfield(L, -2, "huge"); + lua_pushinteger(L, LUA_MAXINTEGER); + lua_setfield(L, -2, "maxinteger"); + lua_pushinteger(L, LUA_MININTEGER); + lua_setfield(L, -2, "mininteger"); + setrandfunc(L); + return 1; +} + diff --git a/06/lua-5.4.6/src/lmem.c b/06/lua-5.4.6/src/lmem.c new file mode 100644 index 0000000..9800a86 --- /dev/null +++ b/06/lua-5.4.6/src/lmem.c @@ -0,0 +1,215 @@ +/* +** $Id: lmem.c $ +** Interface to Memory Manager +** See Copyright Notice in lua.h +*/ + +#define lmem_c +#define LUA_CORE + +#include "lprefix.h" + + +#include + +#include "lua.h" + +#include "ldebug.h" +#include "ldo.h" +#include "lgc.h" +#include "lmem.h" +#include "lobject.h" +#include "lstate.h" + + + +/* +** About the realloc function: +** void *frealloc (void *ud, void *ptr, size_t osize, size_t nsize); +** ('osize' is the old size, 'nsize' is the new size) +** +** - frealloc(ud, p, x, 0) frees the block 'p' and returns NULL. +** Particularly, frealloc(ud, NULL, 0, 0) does nothing, +** which is equivalent to free(NULL) in ISO C. +** +** - frealloc(ud, NULL, x, s) creates a new block of size 's' +** (no matter 'x'). Returns NULL if it cannot create the new block. +** +** - otherwise, frealloc(ud, b, x, y) reallocates the block 'b' from +** size 'x' to size 'y'. Returns NULL if it cannot reallocate the +** block to the new size. +*/ + + +/* +** Macro to call the allocation function. +*/ +#define callfrealloc(g,block,os,ns) ((*g->frealloc)(g->ud, block, os, ns)) + + +/* +** When an allocation fails, it will try again after an emergency +** collection, except when it cannot run a collection. The GC should +** not be called while the state is not fully built, as the collector +** is not yet fully initialized. Also, it should not be called when +** 'gcstopem' is true, because then the interpreter is in the middle of +** a collection step. +*/ +#define cantryagain(g) (completestate(g) && !g->gcstopem) + + + + +#if defined(EMERGENCYGCTESTS) +/* +** First allocation will fail except when freeing a block (frees never +** fail) and when it cannot try again; this fail will trigger 'tryagain' +** and a full GC cycle at every allocation. +*/ +static void *firsttry (global_State *g, void *block, size_t os, size_t ns) { + if (ns > 0 && cantryagain(g)) + return NULL; /* fail */ + else /* normal allocation */ + return callfrealloc(g, block, os, ns); +} +#else +#define firsttry(g,block,os,ns) callfrealloc(g, block, os, ns) +#endif + + + + + +/* +** {================================================================== +** Functions to allocate/deallocate arrays for the Parser +** =================================================================== +*/ + +/* +** Minimum size for arrays during parsing, to avoid overhead of +** reallocating to size 1, then 2, and then 4. All these arrays +** will be reallocated to exact sizes or erased when parsing ends. +*/ +#define MINSIZEARRAY 4 + + +void *luaM_growaux_ (lua_State *L, void *block, int nelems, int *psize, + int size_elems, int limit, const char *what) { + void *newblock; + int size = *psize; + if (nelems + 1 <= size) /* does one extra element still fit? */ + return block; /* nothing to be done */ + if (size >= limit / 2) { /* cannot double it? */ + if (l_unlikely(size >= limit)) /* cannot grow even a little? */ + luaG_runerror(L, "too many %s (limit is %d)", what, limit); + size = limit; /* still have at least one free place */ + } + else { + size *= 2; + if (size < MINSIZEARRAY) + size = MINSIZEARRAY; /* minimum size */ + } + lua_assert(nelems + 1 <= size && size <= limit); + /* 'limit' ensures that multiplication will not overflow */ + newblock = luaM_saferealloc_(L, block, cast_sizet(*psize) * size_elems, + cast_sizet(size) * size_elems); + *psize = size; /* update only when everything else is OK */ + return newblock; +} + + +/* +** In prototypes, the size of the array is also its number of +** elements (to save memory). So, if it cannot shrink an array +** to its number of elements, the only option is to raise an +** error. +*/ +void *luaM_shrinkvector_ (lua_State *L, void *block, int *size, + int final_n, int size_elem) { + void *newblock; + size_t oldsize = cast_sizet((*size) * size_elem); + size_t newsize = cast_sizet(final_n * size_elem); + lua_assert(newsize <= oldsize); + newblock = luaM_saferealloc_(L, block, oldsize, newsize); + *size = final_n; + return newblock; +} + +/* }================================================================== */ + + +l_noret luaM_toobig (lua_State *L) { + luaG_runerror(L, "memory allocation error: block too big"); +} + + +/* +** Free memory +*/ +void luaM_free_ (lua_State *L, void *block, size_t osize) { + global_State *g = G(L); + lua_assert((osize == 0) == (block == NULL)); + callfrealloc(g, block, osize, 0); + g->GCdebt -= osize; +} + + +/* +** In case of allocation fail, this function will do an emergency +** collection to free some memory and then try the allocation again. +*/ +static void *tryagain (lua_State *L, void *block, + size_t osize, size_t nsize) { + global_State *g = G(L); + if (cantryagain(g)) { + luaC_fullgc(L, 1); /* try to free some memory... */ + return callfrealloc(g, block, osize, nsize); /* try again */ + } + else return NULL; /* cannot run an emergency collection */ +} + + +/* +** Generic allocation routine. +*/ +void *luaM_realloc_ (lua_State *L, void *block, size_t osize, size_t nsize) { + void *newblock; + global_State *g = G(L); + lua_assert((osize == 0) == (block == NULL)); + newblock = firsttry(g, block, osize, nsize); + if (l_unlikely(newblock == NULL && nsize > 0)) { + newblock = tryagain(L, block, osize, nsize); + if (newblock == NULL) /* still no memory? */ + return NULL; /* do not update 'GCdebt' */ + } + lua_assert((nsize == 0) == (newblock == NULL)); + g->GCdebt = (g->GCdebt + nsize) - osize; + return newblock; +} + + +void *luaM_saferealloc_ (lua_State *L, void *block, size_t osize, + size_t nsize) { + void *newblock = luaM_realloc_(L, block, osize, nsize); + if (l_unlikely(newblock == NULL && nsize > 0)) /* allocation failed? */ + luaM_error(L); + return newblock; +} + + +void *luaM_malloc_ (lua_State *L, size_t size, int tag) { + if (size == 0) + return NULL; /* that's all */ + else { + global_State *g = G(L); + void *newblock = firsttry(g, NULL, tag, size); + if (l_unlikely(newblock == NULL)) { + newblock = tryagain(L, NULL, tag, size); + if (newblock == NULL) + luaM_error(L); + } + g->GCdebt += size; + return newblock; + } +} diff --git a/06/lua-5.4.6/src/lmem.h b/06/lua-5.4.6/src/lmem.h new file mode 100644 index 0000000..8c75a44 --- /dev/null +++ b/06/lua-5.4.6/src/lmem.h @@ -0,0 +1,93 @@ +/* +** $Id: lmem.h $ +** Interface to Memory Manager +** See Copyright Notice in lua.h +*/ + +#ifndef lmem_h +#define lmem_h + + +#include + +#include "llimits.h" +#include "lua.h" + + +#define luaM_error(L) luaD_throw(L, LUA_ERRMEM) + + +/* +** This macro tests whether it is safe to multiply 'n' by the size of +** type 't' without overflows. Because 'e' is always constant, it avoids +** the runtime division MAX_SIZET/(e). +** (The macro is somewhat complex to avoid warnings: The 'sizeof' +** comparison avoids a runtime comparison when overflow cannot occur. +** The compiler should be able to optimize the real test by itself, but +** when it does it, it may give a warning about "comparison is always +** false due to limited range of data type"; the +1 tricks the compiler, +** avoiding this warning but also this optimization.) +*/ +#define luaM_testsize(n,e) \ + (sizeof(n) >= sizeof(size_t) && cast_sizet((n)) + 1 > MAX_SIZET/(e)) + +#define luaM_checksize(L,n,e) \ + (luaM_testsize(n,e) ? luaM_toobig(L) : cast_void(0)) + + +/* +** Computes the minimum between 'n' and 'MAX_SIZET/sizeof(t)', so that +** the result is not larger than 'n' and cannot overflow a 'size_t' +** when multiplied by the size of type 't'. (Assumes that 'n' is an +** 'int' or 'unsigned int' and that 'int' is not larger than 'size_t'.) +*/ +#define luaM_limitN(n,t) \ + ((cast_sizet(n) <= MAX_SIZET/sizeof(t)) ? (n) : \ + cast_uint((MAX_SIZET/sizeof(t)))) + + +/* +** Arrays of chars do not need any test +*/ +#define luaM_reallocvchar(L,b,on,n) \ + cast_charp(luaM_saferealloc_(L, (b), (on)*sizeof(char), (n)*sizeof(char))) + +#define luaM_freemem(L, b, s) luaM_free_(L, (b), (s)) +#define luaM_free(L, b) luaM_free_(L, (b), sizeof(*(b))) +#define luaM_freearray(L, b, n) luaM_free_(L, (b), (n)*sizeof(*(b))) + +#define luaM_new(L,t) cast(t*, luaM_malloc_(L, sizeof(t), 0)) +#define luaM_newvector(L,n,t) cast(t*, luaM_malloc_(L, (n)*sizeof(t), 0)) +#define luaM_newvectorchecked(L,n,t) \ + (luaM_checksize(L,n,sizeof(t)), luaM_newvector(L,n,t)) + +#define luaM_newobject(L,tag,s) luaM_malloc_(L, (s), tag) + +#define luaM_growvector(L,v,nelems,size,t,limit,e) \ + ((v)=cast(t *, luaM_growaux_(L,v,nelems,&(size),sizeof(t), \ + luaM_limitN(limit,t),e))) + +#define luaM_reallocvector(L, v,oldn,n,t) \ + (cast(t *, luaM_realloc_(L, v, cast_sizet(oldn) * sizeof(t), \ + cast_sizet(n) * sizeof(t)))) + +#define luaM_shrinkvector(L,v,size,fs,t) \ + ((v)=cast(t *, luaM_shrinkvector_(L, v, &(size), fs, sizeof(t)))) + +LUAI_FUNC l_noret luaM_toobig (lua_State *L); + +/* not to be called directly */ +LUAI_FUNC void *luaM_realloc_ (lua_State *L, void *block, size_t oldsize, + size_t size); +LUAI_FUNC void *luaM_saferealloc_ (lua_State *L, void *block, size_t oldsize, + size_t size); +LUAI_FUNC void luaM_free_ (lua_State *L, void *block, size_t osize); +LUAI_FUNC void *luaM_growaux_ (lua_State *L, void *block, int nelems, + int *size, int size_elem, int limit, + const char *what); +LUAI_FUNC void *luaM_shrinkvector_ (lua_State *L, void *block, int *nelem, + int final_n, int size_elem); +LUAI_FUNC void *luaM_malloc_ (lua_State *L, size_t size, int tag); + +#endif + diff --git a/06/lua-5.4.6/src/loadlib.c b/06/lua-5.4.6/src/loadlib.c new file mode 100644 index 0000000..d792dff --- /dev/null +++ b/06/lua-5.4.6/src/loadlib.c @@ -0,0 +1,767 @@ +/* +** $Id: loadlib.c $ +** Dynamic library loader for Lua +** See Copyright Notice in lua.h +** +** This module contains an implementation of loadlib for Unix systems +** that have dlfcn, an implementation for Windows, and a stub for other +** systems. +*/ + +#define loadlib_c +#define LUA_LIB + +#include "lprefix.h" + + +#include +#include +#include + +#include "lua.h" + +#include "lauxlib.h" +#include "lualib.h" + + +/* +** LUA_IGMARK is a mark to ignore all before it when building the +** luaopen_ function name. +*/ +#if !defined (LUA_IGMARK) +#define LUA_IGMARK "-" +#endif + + +/* +** LUA_CSUBSEP is the character that replaces dots in submodule names +** when searching for a C loader. +** LUA_LSUBSEP is the character that replaces dots in submodule names +** when searching for a Lua loader. +*/ +#if !defined(LUA_CSUBSEP) +#define LUA_CSUBSEP LUA_DIRSEP +#endif + +#if !defined(LUA_LSUBSEP) +#define LUA_LSUBSEP LUA_DIRSEP +#endif + + +/* prefix for open functions in C libraries */ +#define LUA_POF "luaopen_" + +/* separator for open functions in C libraries */ +#define LUA_OFSEP "_" + + +/* +** key for table in the registry that keeps handles +** for all loaded C libraries +*/ +static const char *const CLIBS = "_CLIBS"; + +#define LIB_FAIL "open" + + +#define setprogdir(L) ((void)0) + + +/* +** Special type equivalent to '(void*)' for functions in gcc +** (to suppress warnings when converting function pointers) +*/ +typedef void (*voidf)(void); + + +/* +** system-dependent functions +*/ + +/* +** unload library 'lib' +*/ +static void lsys_unloadlib (void *lib); + +/* +** load C library in file 'path'. If 'seeglb', load with all names in +** the library global. +** Returns the library; in case of error, returns NULL plus an +** error string in the stack. +*/ +static void *lsys_load (lua_State *L, const char *path, int seeglb); + +/* +** Try to find a function named 'sym' in library 'lib'. +** Returns the function; in case of error, returns NULL plus an +** error string in the stack. +*/ +static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym); + + + + +#if defined(LUA_USE_DLOPEN) /* { */ +/* +** {======================================================================== +** This is an implementation of loadlib based on the dlfcn interface. +** The dlfcn interface is available in Linux, SunOS, Solaris, IRIX, FreeBSD, +** NetBSD, AIX 4.2, HPUX 11, and probably most other Unix flavors, at least +** as an emulation layer on top of native functions. +** ========================================================================= +*/ + +#include + +/* +** Macro to convert pointer-to-void* to pointer-to-function. This cast +** is undefined according to ISO C, but POSIX assumes that it works. +** (The '__extension__' in gnu compilers is only to avoid warnings.) +*/ +#if defined(__GNUC__) +#define cast_func(p) (__extension__ (lua_CFunction)(p)) +#else +#define cast_func(p) ((lua_CFunction)(p)) +#endif + + +static void lsys_unloadlib (void *lib) { + dlclose(lib); +} + + +static void *lsys_load (lua_State *L, const char *path, int seeglb) { + void *lib = dlopen(path, RTLD_NOW | (seeglb ? RTLD_GLOBAL : RTLD_LOCAL)); + if (l_unlikely(lib == NULL)) + lua_pushstring(L, dlerror()); + return lib; +} + + +static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym) { + lua_CFunction f = cast_func(dlsym(lib, sym)); + if (l_unlikely(f == NULL)) + lua_pushstring(L, dlerror()); + return f; +} + +/* }====================================================== */ + + + +#elif defined(LUA_DL_DLL) /* }{ */ +/* +** {====================================================================== +** This is an implementation of loadlib for Windows using native functions. +** ======================================================================= +*/ + +#include + + +/* +** optional flags for LoadLibraryEx +*/ +#if !defined(LUA_LLE_FLAGS) +#define LUA_LLE_FLAGS 0 +#endif + + +#undef setprogdir + + +/* +** Replace in the path (on the top of the stack) any occurrence +** of LUA_EXEC_DIR with the executable's path. +*/ +static void setprogdir (lua_State *L) { + char buff[MAX_PATH + 1]; + char *lb; + DWORD nsize = sizeof(buff)/sizeof(char); + DWORD n = GetModuleFileNameA(NULL, buff, nsize); /* get exec. name */ + if (n == 0 || n == nsize || (lb = strrchr(buff, '\\')) == NULL) + luaL_error(L, "unable to get ModuleFileName"); + else { + *lb = '\0'; /* cut name on the last '\\' to get the path */ + luaL_gsub(L, lua_tostring(L, -1), LUA_EXEC_DIR, buff); + lua_remove(L, -2); /* remove original string */ + } +} + + + + +static void pusherror (lua_State *L) { + int error = GetLastError(); + char buffer[128]; + if (FormatMessageA(FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_FROM_SYSTEM, + NULL, error, 0, buffer, sizeof(buffer)/sizeof(char), NULL)) + lua_pushstring(L, buffer); + else + lua_pushfstring(L, "system error %d\n", error); +} + +static void lsys_unloadlib (void *lib) { + FreeLibrary((HMODULE)lib); +} + + +static void *lsys_load (lua_State *L, const char *path, int seeglb) { + HMODULE lib = LoadLibraryExA(path, NULL, LUA_LLE_FLAGS); + (void)(seeglb); /* not used: symbols are 'global' by default */ + if (lib == NULL) pusherror(L); + return lib; +} + + +static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym) { + lua_CFunction f = (lua_CFunction)(voidf)GetProcAddress((HMODULE)lib, sym); + if (f == NULL) pusherror(L); + return f; +} + +/* }====================================================== */ + + +#else /* }{ */ +/* +** {====================================================== +** Fallback for other systems +** ======================================================= +*/ + +#undef LIB_FAIL +#define LIB_FAIL "absent" + + +#define DLMSG "dynamic libraries not enabled; check your Lua installation" + + +static void lsys_unloadlib (void *lib) { + (void)(lib); /* not used */ +} + + +static void *lsys_load (lua_State *L, const char *path, int seeglb) { + (void)(path); (void)(seeglb); /* not used */ + lua_pushliteral(L, DLMSG); + return NULL; +} + + +static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym) { + (void)(lib); (void)(sym); /* not used */ + lua_pushliteral(L, DLMSG); + return NULL; +} + +/* }====================================================== */ +#endif /* } */ + + +/* +** {================================================================== +** Set Paths +** =================================================================== +*/ + +/* +** LUA_PATH_VAR and LUA_CPATH_VAR are the names of the environment +** variables that Lua check to set its paths. +*/ +#if !defined(LUA_PATH_VAR) +#define LUA_PATH_VAR "LUA_PATH" +#endif + +#if !defined(LUA_CPATH_VAR) +#define LUA_CPATH_VAR "LUA_CPATH" +#endif + + + +/* +** return registry.LUA_NOENV as a boolean +*/ +static int noenv (lua_State *L) { + int b; + lua_getfield(L, LUA_REGISTRYINDEX, "LUA_NOENV"); + b = lua_toboolean(L, -1); + lua_pop(L, 1); /* remove value */ + return b; +} + + +/* +** Set a path +*/ +static void setpath (lua_State *L, const char *fieldname, + const char *envname, + const char *dft) { + const char *dftmark; + const char *nver = lua_pushfstring(L, "%s%s", envname, LUA_VERSUFFIX); + const char *path = getenv(nver); /* try versioned name */ + if (path == NULL) /* no versioned environment variable? */ + path = getenv(envname); /* try unversioned name */ + if (path == NULL || noenv(L)) /* no environment variable? */ + lua_pushstring(L, dft); /* use default */ + else if ((dftmark = strstr(path, LUA_PATH_SEP LUA_PATH_SEP)) == NULL) + lua_pushstring(L, path); /* nothing to change */ + else { /* path contains a ";;": insert default path in its place */ + size_t len = strlen(path); + luaL_Buffer b; + luaL_buffinit(L, &b); + if (path < dftmark) { /* is there a prefix before ';;'? */ + luaL_addlstring(&b, path, dftmark - path); /* add it */ + luaL_addchar(&b, *LUA_PATH_SEP); + } + luaL_addstring(&b, dft); /* add default */ + if (dftmark < path + len - 2) { /* is there a suffix after ';;'? */ + luaL_addchar(&b, *LUA_PATH_SEP); + luaL_addlstring(&b, dftmark + 2, (path + len - 2) - dftmark); + } + luaL_pushresult(&b); + } + setprogdir(L); + lua_setfield(L, -3, fieldname); /* package[fieldname] = path value */ + lua_pop(L, 1); /* pop versioned variable name ('nver') */ +} + +/* }================================================================== */ + + +/* +** return registry.CLIBS[path] +*/ +static void *checkclib (lua_State *L, const char *path) { + void *plib; + lua_getfield(L, LUA_REGISTRYINDEX, CLIBS); + lua_getfield(L, -1, path); + plib = lua_touserdata(L, -1); /* plib = CLIBS[path] */ + lua_pop(L, 2); /* pop CLIBS table and 'plib' */ + return plib; +} + + +/* +** registry.CLIBS[path] = plib -- for queries +** registry.CLIBS[#CLIBS + 1] = plib -- also keep a list of all libraries +*/ +static void addtoclib (lua_State *L, const char *path, void *plib) { + lua_getfield(L, LUA_REGISTRYINDEX, CLIBS); + lua_pushlightuserdata(L, plib); + lua_pushvalue(L, -1); + lua_setfield(L, -3, path); /* CLIBS[path] = plib */ + lua_rawseti(L, -2, luaL_len(L, -2) + 1); /* CLIBS[#CLIBS + 1] = plib */ + lua_pop(L, 1); /* pop CLIBS table */ +} + + +/* +** __gc tag method for CLIBS table: calls 'lsys_unloadlib' for all lib +** handles in list CLIBS +*/ +static int gctm (lua_State *L) { + lua_Integer n = luaL_len(L, 1); + for (; n >= 1; n--) { /* for each handle, in reverse order */ + lua_rawgeti(L, 1, n); /* get handle CLIBS[n] */ + lsys_unloadlib(lua_touserdata(L, -1)); + lua_pop(L, 1); /* pop handle */ + } + return 0; +} + + + +/* error codes for 'lookforfunc' */ +#define ERRLIB 1 +#define ERRFUNC 2 + +/* +** Look for a C function named 'sym' in a dynamically loaded library +** 'path'. +** First, check whether the library is already loaded; if not, try +** to load it. +** Then, if 'sym' is '*', return true (as library has been loaded). +** Otherwise, look for symbol 'sym' in the library and push a +** C function with that symbol. +** Return 0 and 'true' or a function in the stack; in case of +** errors, return an error code and an error message in the stack. +*/ +static int lookforfunc (lua_State *L, const char *path, const char *sym) { + void *reg = checkclib(L, path); /* check loaded C libraries */ + if (reg == NULL) { /* must load library? */ + reg = lsys_load(L, path, *sym == '*'); /* global symbols if 'sym'=='*' */ + if (reg == NULL) return ERRLIB; /* unable to load library */ + addtoclib(L, path, reg); + } + if (*sym == '*') { /* loading only library (no function)? */ + lua_pushboolean(L, 1); /* return 'true' */ + return 0; /* no errors */ + } + else { + lua_CFunction f = lsys_sym(L, reg, sym); + if (f == NULL) + return ERRFUNC; /* unable to find function */ + lua_pushcfunction(L, f); /* else create new function */ + return 0; /* no errors */ + } +} + + +static int ll_loadlib (lua_State *L) { + const char *path = luaL_checkstring(L, 1); + const char *init = luaL_checkstring(L, 2); + int stat = lookforfunc(L, path, init); + if (l_likely(stat == 0)) /* no errors? */ + return 1; /* return the loaded function */ + else { /* error; error message is on stack top */ + luaL_pushfail(L); + lua_insert(L, -2); + lua_pushstring(L, (stat == ERRLIB) ? LIB_FAIL : "init"); + return 3; /* return fail, error message, and where */ + } +} + + + +/* +** {====================================================== +** 'require' function +** ======================================================= +*/ + + +static int readable (const char *filename) { + FILE *f = fopen(filename, "r"); /* try to open file */ + if (f == NULL) return 0; /* open failed */ + fclose(f); + return 1; +} + + +/* +** Get the next name in '*path' = 'name1;name2;name3;...', changing +** the ending ';' to '\0' to create a zero-terminated string. Return +** NULL when list ends. +*/ +static const char *getnextfilename (char **path, char *end) { + char *sep; + char *name = *path; + if (name == end) + return NULL; /* no more names */ + else if (*name == '\0') { /* from previous iteration? */ + *name = *LUA_PATH_SEP; /* restore separator */ + name++; /* skip it */ + } + sep = strchr(name, *LUA_PATH_SEP); /* find next separator */ + if (sep == NULL) /* separator not found? */ + sep = end; /* name goes until the end */ + *sep = '\0'; /* finish file name */ + *path = sep; /* will start next search from here */ + return name; +} + + +/* +** Given a path such as ";blabla.so;blublu.so", pushes the string +** +** no file 'blabla.so' +** no file 'blublu.so' +*/ +static void pusherrornotfound (lua_State *L, const char *path) { + luaL_Buffer b; + luaL_buffinit(L, &b); + luaL_addstring(&b, "no file '"); + luaL_addgsub(&b, path, LUA_PATH_SEP, "'\n\tno file '"); + luaL_addstring(&b, "'"); + luaL_pushresult(&b); +} + + +static const char *searchpath (lua_State *L, const char *name, + const char *path, + const char *sep, + const char *dirsep) { + luaL_Buffer buff; + char *pathname; /* path with name inserted */ + char *endpathname; /* its end */ + const char *filename; + /* separator is non-empty and appears in 'name'? */ + if (*sep != '\0' && strchr(name, *sep) != NULL) + name = luaL_gsub(L, name, sep, dirsep); /* replace it by 'dirsep' */ + luaL_buffinit(L, &buff); + /* add path to the buffer, replacing marks ('?') with the file name */ + luaL_addgsub(&buff, path, LUA_PATH_MARK, name); + luaL_addchar(&buff, '\0'); + pathname = luaL_buffaddr(&buff); /* writable list of file names */ + endpathname = pathname + luaL_bufflen(&buff) - 1; + while ((filename = getnextfilename(&pathname, endpathname)) != NULL) { + if (readable(filename)) /* does file exist and is readable? */ + return lua_pushstring(L, filename); /* save and return name */ + } + luaL_pushresult(&buff); /* push path to create error message */ + pusherrornotfound(L, lua_tostring(L, -1)); /* create error message */ + return NULL; /* not found */ +} + + +static int ll_searchpath (lua_State *L) { + const char *f = searchpath(L, luaL_checkstring(L, 1), + luaL_checkstring(L, 2), + luaL_optstring(L, 3, "."), + luaL_optstring(L, 4, LUA_DIRSEP)); + if (f != NULL) return 1; + else { /* error message is on top of the stack */ + luaL_pushfail(L); + lua_insert(L, -2); + return 2; /* return fail + error message */ + } +} + + +static const char *findfile (lua_State *L, const char *name, + const char *pname, + const char *dirsep) { + const char *path; + lua_getfield(L, lua_upvalueindex(1), pname); + path = lua_tostring(L, -1); + if (l_unlikely(path == NULL)) + luaL_error(L, "'package.%s' must be a string", pname); + return searchpath(L, name, path, ".", dirsep); +} + + +static int checkload (lua_State *L, int stat, const char *filename) { + if (l_likely(stat)) { /* module loaded successfully? */ + lua_pushstring(L, filename); /* will be 2nd argument to module */ + return 2; /* return open function and file name */ + } + else + return luaL_error(L, "error loading module '%s' from file '%s':\n\t%s", + lua_tostring(L, 1), filename, lua_tostring(L, -1)); +} + + +static int searcher_Lua (lua_State *L) { + const char *filename; + const char *name = luaL_checkstring(L, 1); + filename = findfile(L, name, "path", LUA_LSUBSEP); + if (filename == NULL) return 1; /* module not found in this path */ + return checkload(L, (luaL_loadfile(L, filename) == LUA_OK), filename); +} + + +/* +** Try to find a load function for module 'modname' at file 'filename'. +** First, change '.' to '_' in 'modname'; then, if 'modname' has +** the form X-Y (that is, it has an "ignore mark"), build a function +** name "luaopen_X" and look for it. (For compatibility, if that +** fails, it also tries "luaopen_Y".) If there is no ignore mark, +** look for a function named "luaopen_modname". +*/ +static int loadfunc (lua_State *L, const char *filename, const char *modname) { + const char *openfunc; + const char *mark; + modname = luaL_gsub(L, modname, ".", LUA_OFSEP); + mark = strchr(modname, *LUA_IGMARK); + if (mark) { + int stat; + openfunc = lua_pushlstring(L, modname, mark - modname); + openfunc = lua_pushfstring(L, LUA_POF"%s", openfunc); + stat = lookforfunc(L, filename, openfunc); + if (stat != ERRFUNC) return stat; + modname = mark + 1; /* else go ahead and try old-style name */ + } + openfunc = lua_pushfstring(L, LUA_POF"%s", modname); + return lookforfunc(L, filename, openfunc); +} + + +static int searcher_C (lua_State *L) { + const char *name = luaL_checkstring(L, 1); + const char *filename = findfile(L, name, "cpath", LUA_CSUBSEP); + if (filename == NULL) return 1; /* module not found in this path */ + return checkload(L, (loadfunc(L, filename, name) == 0), filename); +} + + +static int searcher_Croot (lua_State *L) { + const char *filename; + const char *name = luaL_checkstring(L, 1); + const char *p = strchr(name, '.'); + int stat; + if (p == NULL) return 0; /* is root */ + lua_pushlstring(L, name, p - name); + filename = findfile(L, lua_tostring(L, -1), "cpath", LUA_CSUBSEP); + if (filename == NULL) return 1; /* root not found */ + if ((stat = loadfunc(L, filename, name)) != 0) { + if (stat != ERRFUNC) + return checkload(L, 0, filename); /* real error */ + else { /* open function not found */ + lua_pushfstring(L, "no module '%s' in file '%s'", name, filename); + return 1; + } + } + lua_pushstring(L, filename); /* will be 2nd argument to module */ + return 2; +} + + +static int searcher_preload (lua_State *L) { + const char *name = luaL_checkstring(L, 1); + lua_getfield(L, LUA_REGISTRYINDEX, LUA_PRELOAD_TABLE); + if (lua_getfield(L, -1, name) == LUA_TNIL) { /* not found? */ + lua_pushfstring(L, "no field package.preload['%s']", name); + return 1; + } + else { + lua_pushliteral(L, ":preload:"); + return 2; + } +} + + +static void findloader (lua_State *L, const char *name) { + int i; + luaL_Buffer msg; /* to build error message */ + /* push 'package.searchers' to index 3 in the stack */ + if (l_unlikely(lua_getfield(L, lua_upvalueindex(1), "searchers") + != LUA_TTABLE)) + luaL_error(L, "'package.searchers' must be a table"); + luaL_buffinit(L, &msg); + /* iterate over available searchers to find a loader */ + for (i = 1; ; i++) { + luaL_addstring(&msg, "\n\t"); /* error-message prefix */ + if (l_unlikely(lua_rawgeti(L, 3, i) == LUA_TNIL)) { /* no more searchers? */ + lua_pop(L, 1); /* remove nil */ + luaL_buffsub(&msg, 2); /* remove prefix */ + luaL_pushresult(&msg); /* create error message */ + luaL_error(L, "module '%s' not found:%s", name, lua_tostring(L, -1)); + } + lua_pushstring(L, name); + lua_call(L, 1, 2); /* call it */ + if (lua_isfunction(L, -2)) /* did it find a loader? */ + return; /* module loader found */ + else if (lua_isstring(L, -2)) { /* searcher returned error message? */ + lua_pop(L, 1); /* remove extra return */ + luaL_addvalue(&msg); /* concatenate error message */ + } + else { /* no error message */ + lua_pop(L, 2); /* remove both returns */ + luaL_buffsub(&msg, 2); /* remove prefix */ + } + } +} + + +static int ll_require (lua_State *L) { + const char *name = luaL_checkstring(L, 1); + lua_settop(L, 1); /* LOADED table will be at index 2 */ + lua_getfield(L, LUA_REGISTRYINDEX, LUA_LOADED_TABLE); + lua_getfield(L, 2, name); /* LOADED[name] */ + if (lua_toboolean(L, -1)) /* is it there? */ + return 1; /* package is already loaded */ + /* else must load package */ + lua_pop(L, 1); /* remove 'getfield' result */ + findloader(L, name); + lua_rotate(L, -2, 1); /* function <-> loader data */ + lua_pushvalue(L, 1); /* name is 1st argument to module loader */ + lua_pushvalue(L, -3); /* loader data is 2nd argument */ + /* stack: ...; loader data; loader function; mod. name; loader data */ + lua_call(L, 2, 1); /* run loader to load module */ + /* stack: ...; loader data; result from loader */ + if (!lua_isnil(L, -1)) /* non-nil return? */ + lua_setfield(L, 2, name); /* LOADED[name] = returned value */ + else + lua_pop(L, 1); /* pop nil */ + if (lua_getfield(L, 2, name) == LUA_TNIL) { /* module set no value? */ + lua_pushboolean(L, 1); /* use true as result */ + lua_copy(L, -1, -2); /* replace loader result */ + lua_setfield(L, 2, name); /* LOADED[name] = true */ + } + lua_rotate(L, -2, 1); /* loader data <-> module result */ + return 2; /* return module result and loader data */ +} + +/* }====================================================== */ + + + + +static const luaL_Reg pk_funcs[] = { + {"loadlib", ll_loadlib}, + {"searchpath", ll_searchpath}, + /* placeholders */ + {"preload", NULL}, + {"cpath", NULL}, + {"path", NULL}, + {"searchers", NULL}, + {"loaded", NULL}, + {NULL, NULL} +}; + + +static const luaL_Reg ll_funcs[] = { + {"require", ll_require}, + {NULL, NULL} +}; + + +static void createsearcherstable (lua_State *L) { + static const lua_CFunction searchers[] = { + searcher_preload, + searcher_Lua, + searcher_C, + searcher_Croot, + NULL + }; + int i; + /* create 'searchers' table */ + lua_createtable(L, sizeof(searchers)/sizeof(searchers[0]) - 1, 0); + /* fill it with predefined searchers */ + for (i=0; searchers[i] != NULL; i++) { + lua_pushvalue(L, -2); /* set 'package' as upvalue for all searchers */ + lua_pushcclosure(L, searchers[i], 1); + lua_rawseti(L, -2, i+1); + } + lua_setfield(L, -2, "searchers"); /* put it in field 'searchers' */ +} + + +/* +** create table CLIBS to keep track of loaded C libraries, +** setting a finalizer to close all libraries when closing state. +*/ +static void createclibstable (lua_State *L) { + luaL_getsubtable(L, LUA_REGISTRYINDEX, CLIBS); /* create CLIBS table */ + lua_createtable(L, 0, 1); /* create metatable for CLIBS */ + lua_pushcfunction(L, gctm); + lua_setfield(L, -2, "__gc"); /* set finalizer for CLIBS table */ + lua_setmetatable(L, -2); +} + + +LUAMOD_API int luaopen_package (lua_State *L) { + createclibstable(L); + luaL_newlib(L, pk_funcs); /* create 'package' table */ + createsearcherstable(L); + /* set paths */ + setpath(L, "path", LUA_PATH_VAR, LUA_PATH_DEFAULT); + setpath(L, "cpath", LUA_CPATH_VAR, LUA_CPATH_DEFAULT); + /* store config information */ + lua_pushliteral(L, LUA_DIRSEP "\n" LUA_PATH_SEP "\n" LUA_PATH_MARK "\n" + LUA_EXEC_DIR "\n" LUA_IGMARK "\n"); + lua_setfield(L, -2, "config"); + /* set field 'loaded' */ + luaL_getsubtable(L, LUA_REGISTRYINDEX, LUA_LOADED_TABLE); + lua_setfield(L, -2, "loaded"); + /* set field 'preload' */ + luaL_getsubtable(L, LUA_REGISTRYINDEX, LUA_PRELOAD_TABLE); + lua_setfield(L, -2, "preload"); + lua_pushglobaltable(L); + lua_pushvalue(L, -2); /* set 'package' as upvalue for next lib */ + luaL_setfuncs(L, ll_funcs, 1); /* open lib into global table */ + lua_pop(L, 1); /* pop global table */ + return 1; /* return 'package' table */ +} + diff --git a/06/lua-5.4.6/src/lobject.c b/06/lua-5.4.6/src/lobject.c new file mode 100644 index 0000000..f73ffc6 --- /dev/null +++ b/06/lua-5.4.6/src/lobject.c @@ -0,0 +1,602 @@ +/* +** $Id: lobject.c $ +** Some generic functions over Lua objects +** See Copyright Notice in lua.h +*/ + +#define lobject_c +#define LUA_CORE + +#include "lprefix.h" + + +#include +#include +#include +#include +#include +#include + +#include "lua.h" + +#include "lctype.h" +#include "ldebug.h" +#include "ldo.h" +#include "lmem.h" +#include "lobject.h" +#include "lstate.h" +#include "lstring.h" +#include "lvm.h" + + +/* +** Computes ceil(log2(x)) +*/ +int luaO_ceillog2 (unsigned int x) { + static const lu_byte log_2[256] = { /* log_2[i] = ceil(log2(i - 1)) */ + 0,1,2,2,3,3,3,3,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5, + 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6, + 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, + 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8 + }; + int l = 0; + x--; + while (x >= 256) { l += 8; x >>= 8; } + return l + log_2[x]; +} + + +static lua_Integer intarith (lua_State *L, int op, lua_Integer v1, + lua_Integer v2) { + switch (op) { + case LUA_OPADD: return intop(+, v1, v2); + case LUA_OPSUB:return intop(-, v1, v2); + case LUA_OPMUL:return intop(*, v1, v2); + case LUA_OPMOD: return luaV_mod(L, v1, v2); + case LUA_OPIDIV: return luaV_idiv(L, v1, v2); + case LUA_OPBAND: return intop(&, v1, v2); + case LUA_OPBOR: return intop(|, v1, v2); + case LUA_OPBXOR: return intop(^, v1, v2); + case LUA_OPSHL: return luaV_shiftl(v1, v2); + case LUA_OPSHR: return luaV_shiftr(v1, v2); + case LUA_OPUNM: return intop(-, 0, v1); + case LUA_OPBNOT: return intop(^, ~l_castS2U(0), v1); + default: lua_assert(0); return 0; + } +} + + +static lua_Number numarith (lua_State *L, int op, lua_Number v1, + lua_Number v2) { + switch (op) { + case LUA_OPADD: return luai_numadd(L, v1, v2); + case LUA_OPSUB: return luai_numsub(L, v1, v2); + case LUA_OPMUL: return luai_nummul(L, v1, v2); + case LUA_OPDIV: return luai_numdiv(L, v1, v2); + case LUA_OPPOW: return luai_numpow(L, v1, v2); + case LUA_OPIDIV: return luai_numidiv(L, v1, v2); + case LUA_OPUNM: return luai_numunm(L, v1); + case LUA_OPMOD: return luaV_modf(L, v1, v2); + default: lua_assert(0); return 0; + } +} + + +int luaO_rawarith (lua_State *L, int op, const TValue *p1, const TValue *p2, + TValue *res) { + switch (op) { + case LUA_OPBAND: case LUA_OPBOR: case LUA_OPBXOR: + case LUA_OPSHL: case LUA_OPSHR: + case LUA_OPBNOT: { /* operate only on integers */ + lua_Integer i1; lua_Integer i2; + if (tointegerns(p1, &i1) && tointegerns(p2, &i2)) { + setivalue(res, intarith(L, op, i1, i2)); + return 1; + } + else return 0; /* fail */ + } + case LUA_OPDIV: case LUA_OPPOW: { /* operate only on floats */ + lua_Number n1; lua_Number n2; + if (tonumberns(p1, n1) && tonumberns(p2, n2)) { + setfltvalue(res, numarith(L, op, n1, n2)); + return 1; + } + else return 0; /* fail */ + } + default: { /* other operations */ + lua_Number n1; lua_Number n2; + if (ttisinteger(p1) && ttisinteger(p2)) { + setivalue(res, intarith(L, op, ivalue(p1), ivalue(p2))); + return 1; + } + else if (tonumberns(p1, n1) && tonumberns(p2, n2)) { + setfltvalue(res, numarith(L, op, n1, n2)); + return 1; + } + else return 0; /* fail */ + } + } +} + + +void luaO_arith (lua_State *L, int op, const TValue *p1, const TValue *p2, + StkId res) { + if (!luaO_rawarith(L, op, p1, p2, s2v(res))) { + /* could not perform raw operation; try metamethod */ + luaT_trybinTM(L, p1, p2, res, cast(TMS, (op - LUA_OPADD) + TM_ADD)); + } +} + + +int luaO_hexavalue (int c) { + if (lisdigit(c)) return c - '0'; + else return (ltolower(c) - 'a') + 10; +} + + +static int isneg (const char **s) { + if (**s == '-') { (*s)++; return 1; } + else if (**s == '+') (*s)++; + return 0; +} + + + +/* +** {================================================================== +** Lua's implementation for 'lua_strx2number' +** =================================================================== +*/ + +#if !defined(lua_strx2number) + +/* maximum number of significant digits to read (to avoid overflows + even with single floats) */ +#define MAXSIGDIG 30 + +/* +** convert a hexadecimal numeric string to a number, following +** C99 specification for 'strtod' +*/ +static lua_Number lua_strx2number (const char *s, char **endptr) { + int dot = lua_getlocaledecpoint(); + lua_Number r = l_mathop(0.0); /* result (accumulator) */ + int sigdig = 0; /* number of significant digits */ + int nosigdig = 0; /* number of non-significant digits */ + int e = 0; /* exponent correction */ + int neg; /* 1 if number is negative */ + int hasdot = 0; /* true after seen a dot */ + *endptr = cast_charp(s); /* nothing is valid yet */ + while (lisspace(cast_uchar(*s))) s++; /* skip initial spaces */ + neg = isneg(&s); /* check sign */ + if (!(*s == '0' && (*(s + 1) == 'x' || *(s + 1) == 'X'))) /* check '0x' */ + return l_mathop(0.0); /* invalid format (no '0x') */ + for (s += 2; ; s++) { /* skip '0x' and read numeral */ + if (*s == dot) { + if (hasdot) break; /* second dot? stop loop */ + else hasdot = 1; + } + else if (lisxdigit(cast_uchar(*s))) { + if (sigdig == 0 && *s == '0') /* non-significant digit (zero)? */ + nosigdig++; + else if (++sigdig <= MAXSIGDIG) /* can read it without overflow? */ + r = (r * l_mathop(16.0)) + luaO_hexavalue(*s); + else e++; /* too many digits; ignore, but still count for exponent */ + if (hasdot) e--; /* decimal digit? correct exponent */ + } + else break; /* neither a dot nor a digit */ + } + if (nosigdig + sigdig == 0) /* no digits? */ + return l_mathop(0.0); /* invalid format */ + *endptr = cast_charp(s); /* valid up to here */ + e *= 4; /* each digit multiplies/divides value by 2^4 */ + if (*s == 'p' || *s == 'P') { /* exponent part? */ + int exp1 = 0; /* exponent value */ + int neg1; /* exponent sign */ + s++; /* skip 'p' */ + neg1 = isneg(&s); /* sign */ + if (!lisdigit(cast_uchar(*s))) + return l_mathop(0.0); /* invalid; must have at least one digit */ + while (lisdigit(cast_uchar(*s))) /* read exponent */ + exp1 = exp1 * 10 + *(s++) - '0'; + if (neg1) exp1 = -exp1; + e += exp1; + *endptr = cast_charp(s); /* valid up to here */ + } + if (neg) r = -r; + return l_mathop(ldexp)(r, e); +} + +#endif +/* }====================================================== */ + + +/* maximum length of a numeral to be converted to a number */ +#if !defined (L_MAXLENNUM) +#define L_MAXLENNUM 200 +#endif + +/* +** Convert string 's' to a Lua number (put in 'result'). Return NULL on +** fail or the address of the ending '\0' on success. ('mode' == 'x') +** means a hexadecimal numeral. +*/ +static const char *l_str2dloc (const char *s, lua_Number *result, int mode) { + char *endptr; + *result = (mode == 'x') ? lua_strx2number(s, &endptr) /* try to convert */ + : lua_str2number(s, &endptr); + if (endptr == s) return NULL; /* nothing recognized? */ + while (lisspace(cast_uchar(*endptr))) endptr++; /* skip trailing spaces */ + return (*endptr == '\0') ? endptr : NULL; /* OK iff no trailing chars */ +} + + +/* +** Convert string 's' to a Lua number (put in 'result') handling the +** current locale. +** This function accepts both the current locale or a dot as the radix +** mark. If the conversion fails, it may mean number has a dot but +** locale accepts something else. In that case, the code copies 's' +** to a buffer (because 's' is read-only), changes the dot to the +** current locale radix mark, and tries to convert again. +** The variable 'mode' checks for special characters in the string: +** - 'n' means 'inf' or 'nan' (which should be rejected) +** - 'x' means a hexadecimal numeral +** - '.' just optimizes the search for the common case (no special chars) +*/ +static const char *l_str2d (const char *s, lua_Number *result) { + const char *endptr; + const char *pmode = strpbrk(s, ".xXnN"); /* look for special chars */ + int mode = pmode ? ltolower(cast_uchar(*pmode)) : 0; + if (mode == 'n') /* reject 'inf' and 'nan' */ + return NULL; + endptr = l_str2dloc(s, result, mode); /* try to convert */ + if (endptr == NULL) { /* failed? may be a different locale */ + char buff[L_MAXLENNUM + 1]; + const char *pdot = strchr(s, '.'); + if (pdot == NULL || strlen(s) > L_MAXLENNUM) + return NULL; /* string too long or no dot; fail */ + strcpy(buff, s); /* copy string to buffer */ + buff[pdot - s] = lua_getlocaledecpoint(); /* correct decimal point */ + endptr = l_str2dloc(buff, result, mode); /* try again */ + if (endptr != NULL) + endptr = s + (endptr - buff); /* make relative to 's' */ + } + return endptr; +} + + +#define MAXBY10 cast(lua_Unsigned, LUA_MAXINTEGER / 10) +#define MAXLASTD cast_int(LUA_MAXINTEGER % 10) + +static const char *l_str2int (const char *s, lua_Integer *result) { + lua_Unsigned a = 0; + int empty = 1; + int neg; + while (lisspace(cast_uchar(*s))) s++; /* skip initial spaces */ + neg = isneg(&s); + if (s[0] == '0' && + (s[1] == 'x' || s[1] == 'X')) { /* hex? */ + s += 2; /* skip '0x' */ + for (; lisxdigit(cast_uchar(*s)); s++) { + a = a * 16 + luaO_hexavalue(*s); + empty = 0; + } + } + else { /* decimal */ + for (; lisdigit(cast_uchar(*s)); s++) { + int d = *s - '0'; + if (a >= MAXBY10 && (a > MAXBY10 || d > MAXLASTD + neg)) /* overflow? */ + return NULL; /* do not accept it (as integer) */ + a = a * 10 + d; + empty = 0; + } + } + while (lisspace(cast_uchar(*s))) s++; /* skip trailing spaces */ + if (empty || *s != '\0') return NULL; /* something wrong in the numeral */ + else { + *result = l_castU2S((neg) ? 0u - a : a); + return s; + } +} + + +size_t luaO_str2num (const char *s, TValue *o) { + lua_Integer i; lua_Number n; + const char *e; + if ((e = l_str2int(s, &i)) != NULL) { /* try as an integer */ + setivalue(o, i); + } + else if ((e = l_str2d(s, &n)) != NULL) { /* else try as a float */ + setfltvalue(o, n); + } + else + return 0; /* conversion failed */ + return (e - s) + 1; /* success; return string size */ +} + + +int luaO_utf8esc (char *buff, unsigned long x) { + int n = 1; /* number of bytes put in buffer (backwards) */ + lua_assert(x <= 0x7FFFFFFFu); + if (x < 0x80) /* ascii? */ + buff[UTF8BUFFSZ - 1] = cast_char(x); + else { /* need continuation bytes */ + unsigned int mfb = 0x3f; /* maximum that fits in first byte */ + do { /* add continuation bytes */ + buff[UTF8BUFFSZ - (n++)] = cast_char(0x80 | (x & 0x3f)); + x >>= 6; /* remove added bits */ + mfb >>= 1; /* now there is one less bit available in first byte */ + } while (x > mfb); /* still needs continuation byte? */ + buff[UTF8BUFFSZ - n] = cast_char((~mfb << 1) | x); /* add first byte */ + } + return n; +} + + +/* +** Maximum length of the conversion of a number to a string. Must be +** enough to accommodate both LUA_INTEGER_FMT and LUA_NUMBER_FMT. +** (For a long long int, this is 19 digits plus a sign and a final '\0', +** adding to 21. For a long double, it can go to a sign, 33 digits, +** the dot, an exponent letter, an exponent sign, 5 exponent digits, +** and a final '\0', adding to 43.) +*/ +#define MAXNUMBER2STR 44 + + +/* +** Convert a number object to a string, adding it to a buffer +*/ +static int tostringbuff (TValue *obj, char *buff) { + int len; + lua_assert(ttisnumber(obj)); + if (ttisinteger(obj)) + len = lua_integer2str(buff, MAXNUMBER2STR, ivalue(obj)); + else { + len = lua_number2str(buff, MAXNUMBER2STR, fltvalue(obj)); + if (buff[strspn(buff, "-0123456789")] == '\0') { /* looks like an int? */ + buff[len++] = lua_getlocaledecpoint(); + buff[len++] = '0'; /* adds '.0' to result */ + } + } + return len; +} + + +/* +** Convert a number object to a Lua string, replacing the value at 'obj' +*/ +void luaO_tostring (lua_State *L, TValue *obj) { + char buff[MAXNUMBER2STR]; + int len = tostringbuff(obj, buff); + setsvalue(L, obj, luaS_newlstr(L, buff, len)); +} + + + + +/* +** {================================================================== +** 'luaO_pushvfstring' +** =================================================================== +*/ + +/* +** Size for buffer space used by 'luaO_pushvfstring'. It should be +** (LUA_IDSIZE + MAXNUMBER2STR) + a minimal space for basic messages, +** so that 'luaG_addinfo' can work directly on the buffer. +*/ +#define BUFVFS (LUA_IDSIZE + MAXNUMBER2STR + 95) + +/* buffer used by 'luaO_pushvfstring' */ +typedef struct BuffFS { + lua_State *L; + int pushed; /* true if there is a part of the result on the stack */ + int blen; /* length of partial string in 'space' */ + char space[BUFVFS]; /* holds last part of the result */ +} BuffFS; + + +/* +** Push given string to the stack, as part of the result, and +** join it to previous partial result if there is one. +** It may call 'luaV_concat' while using one slot from EXTRA_STACK. +** This call cannot invoke metamethods, as both operands must be +** strings. It can, however, raise an error if the result is too +** long. In that case, 'luaV_concat' frees the extra slot before +** raising the error. +*/ +static void pushstr (BuffFS *buff, const char *str, size_t lstr) { + lua_State *L = buff->L; + setsvalue2s(L, L->top.p, luaS_newlstr(L, str, lstr)); + L->top.p++; /* may use one slot from EXTRA_STACK */ + if (!buff->pushed) /* no previous string on the stack? */ + buff->pushed = 1; /* now there is one */ + else /* join previous string with new one */ + luaV_concat(L, 2); +} + + +/* +** empty the buffer space into the stack +*/ +static void clearbuff (BuffFS *buff) { + pushstr(buff, buff->space, buff->blen); /* push buffer contents */ + buff->blen = 0; /* space now is empty */ +} + + +/* +** Get a space of size 'sz' in the buffer. If buffer has not enough +** space, empty it. 'sz' must fit in an empty buffer. +*/ +static char *getbuff (BuffFS *buff, int sz) { + lua_assert(buff->blen <= BUFVFS); lua_assert(sz <= BUFVFS); + if (sz > BUFVFS - buff->blen) /* not enough space? */ + clearbuff(buff); + return buff->space + buff->blen; +} + + +#define addsize(b,sz) ((b)->blen += (sz)) + + +/* +** Add 'str' to the buffer. If string is larger than the buffer space, +** push the string directly to the stack. +*/ +static void addstr2buff (BuffFS *buff, const char *str, size_t slen) { + if (slen <= BUFVFS) { /* does string fit into buffer? */ + char *bf = getbuff(buff, cast_int(slen)); + memcpy(bf, str, slen); /* add string to buffer */ + addsize(buff, cast_int(slen)); + } + else { /* string larger than buffer */ + clearbuff(buff); /* string comes after buffer's content */ + pushstr(buff, str, slen); /* push string */ + } +} + + +/* +** Add a numeral to the buffer. +*/ +static void addnum2buff (BuffFS *buff, TValue *num) { + char *numbuff = getbuff(buff, MAXNUMBER2STR); + int len = tostringbuff(num, numbuff); /* format number into 'numbuff' */ + addsize(buff, len); +} + + +/* +** this function handles only '%d', '%c', '%f', '%p', '%s', and '%%' + conventional formats, plus Lua-specific '%I' and '%U' +*/ +const char *luaO_pushvfstring (lua_State *L, const char *fmt, va_list argp) { + BuffFS buff; /* holds last part of the result */ + const char *e; /* points to next '%' */ + buff.pushed = buff.blen = 0; + buff.L = L; + while ((e = strchr(fmt, '%')) != NULL) { + addstr2buff(&buff, fmt, e - fmt); /* add 'fmt' up to '%' */ + switch (*(e + 1)) { /* conversion specifier */ + case 's': { /* zero-terminated string */ + const char *s = va_arg(argp, char *); + if (s == NULL) s = "(null)"; + addstr2buff(&buff, s, strlen(s)); + break; + } + case 'c': { /* an 'int' as a character */ + char c = cast_uchar(va_arg(argp, int)); + addstr2buff(&buff, &c, sizeof(char)); + break; + } + case 'd': { /* an 'int' */ + TValue num; + setivalue(&num, va_arg(argp, int)); + addnum2buff(&buff, &num); + break; + } + case 'I': { /* a 'lua_Integer' */ + TValue num; + setivalue(&num, cast(lua_Integer, va_arg(argp, l_uacInt))); + addnum2buff(&buff, &num); + break; + } + case 'f': { /* a 'lua_Number' */ + TValue num; + setfltvalue(&num, cast_num(va_arg(argp, l_uacNumber))); + addnum2buff(&buff, &num); + break; + } + case 'p': { /* a pointer */ + const int sz = 3 * sizeof(void*) + 8; /* enough space for '%p' */ + char *bf = getbuff(&buff, sz); + void *p = va_arg(argp, void *); + int len = lua_pointer2str(bf, sz, p); + addsize(&buff, len); + break; + } + case 'U': { /* a 'long' as a UTF-8 sequence */ + char bf[UTF8BUFFSZ]; + int len = luaO_utf8esc(bf, va_arg(argp, long)); + addstr2buff(&buff, bf + UTF8BUFFSZ - len, len); + break; + } + case '%': { + addstr2buff(&buff, "%", 1); + break; + } + default: { + luaG_runerror(L, "invalid option '%%%c' to 'lua_pushfstring'", + *(e + 1)); + } + } + fmt = e + 2; /* skip '%' and the specifier */ + } + addstr2buff(&buff, fmt, strlen(fmt)); /* rest of 'fmt' */ + clearbuff(&buff); /* empty buffer into the stack */ + lua_assert(buff.pushed == 1); + return svalue(s2v(L->top.p - 1)); +} + + +const char *luaO_pushfstring (lua_State *L, const char *fmt, ...) { + const char *msg; + va_list argp; + va_start(argp, fmt); + msg = luaO_pushvfstring(L, fmt, argp); + va_end(argp); + return msg; +} + +/* }================================================================== */ + + +#define RETS "..." +#define PRE "[string \"" +#define POS "\"]" + +#define addstr(a,b,l) ( memcpy(a,b,(l) * sizeof(char)), a += (l) ) + +void luaO_chunkid (char *out, const char *source, size_t srclen) { + size_t bufflen = LUA_IDSIZE; /* free space in buffer */ + if (*source == '=') { /* 'literal' source */ + if (srclen <= bufflen) /* small enough? */ + memcpy(out, source + 1, srclen * sizeof(char)); + else { /* truncate it */ + addstr(out, source + 1, bufflen - 1); + *out = '\0'; + } + } + else if (*source == '@') { /* file name */ + if (srclen <= bufflen) /* small enough? */ + memcpy(out, source + 1, srclen * sizeof(char)); + else { /* add '...' before rest of name */ + addstr(out, RETS, LL(RETS)); + bufflen -= LL(RETS); + memcpy(out, source + 1 + srclen - bufflen, bufflen * sizeof(char)); + } + } + else { /* string; format as [string "source"] */ + const char *nl = strchr(source, '\n'); /* find first new line (if any) */ + addstr(out, PRE, LL(PRE)); /* add prefix */ + bufflen -= LL(PRE RETS POS) + 1; /* save space for prefix+suffix+'\0' */ + if (srclen < bufflen && nl == NULL) { /* small one-line source? */ + addstr(out, source, srclen); /* keep it */ + } + else { + if (nl != NULL) srclen = nl - source; /* stop at first newline */ + if (srclen > bufflen) srclen = bufflen; + addstr(out, source, srclen); + addstr(out, RETS, LL(RETS)); + } + memcpy(out, POS, (LL(POS) + 1) * sizeof(char)); + } +} + diff --git a/06/lua-5.4.6/src/lobject.h b/06/lua-5.4.6/src/lobject.h new file mode 100644 index 0000000..556608e --- /dev/null +++ b/06/lua-5.4.6/src/lobject.h @@ -0,0 +1,815 @@ +/* +** $Id: lobject.h $ +** Type definitions for Lua objects +** See Copyright Notice in lua.h +*/ + + +#ifndef lobject_h +#define lobject_h + + +#include + + +#include "llimits.h" +#include "lua.h" + + +/* +** Extra types for collectable non-values +*/ +#define LUA_TUPVAL LUA_NUMTYPES /* upvalues */ +#define LUA_TPROTO (LUA_NUMTYPES+1) /* function prototypes */ +#define LUA_TDEADKEY (LUA_NUMTYPES+2) /* removed keys in tables */ + + + +/* +** number of all possible types (including LUA_TNONE but excluding DEADKEY) +*/ +#define LUA_TOTALTYPES (LUA_TPROTO + 2) + + +/* +** tags for Tagged Values have the following use of bits: +** bits 0-3: actual tag (a LUA_T* constant) +** bits 4-5: variant bits +** bit 6: whether value is collectable +*/ + +/* add variant bits to a type */ +#define makevariant(t,v) ((t) | ((v) << 4)) + + + +/* +** Union of all Lua values +*/ +typedef union Value { + struct GCObject *gc; /* collectable objects */ + void *p; /* light userdata */ + lua_CFunction f; /* light C functions */ + lua_Integer i; /* integer numbers */ + lua_Number n; /* float numbers */ + /* not used, but may avoid warnings for uninitialized value */ + lu_byte ub; +} Value; + + +/* +** Tagged Values. This is the basic representation of values in Lua: +** an actual value plus a tag with its type. +*/ + +#define TValuefields Value value_; lu_byte tt_ + +typedef struct TValue { + TValuefields; +} TValue; + + +#define val_(o) ((o)->value_) +#define valraw(o) (val_(o)) + + +/* raw type tag of a TValue */ +#define rawtt(o) ((o)->tt_) + +/* tag with no variants (bits 0-3) */ +#define novariant(t) ((t) & 0x0F) + +/* type tag of a TValue (bits 0-3 for tags + variant bits 4-5) */ +#define withvariant(t) ((t) & 0x3F) +#define ttypetag(o) withvariant(rawtt(o)) + +/* type of a TValue */ +#define ttype(o) (novariant(rawtt(o))) + + +/* Macros to test type */ +#define checktag(o,t) (rawtt(o) == (t)) +#define checktype(o,t) (ttype(o) == (t)) + + +/* Macros for internal tests */ + +/* collectable object has the same tag as the original value */ +#define righttt(obj) (ttypetag(obj) == gcvalue(obj)->tt) + +/* +** Any value being manipulated by the program either is non +** collectable, or the collectable object has the right tag +** and it is not dead. The option 'L == NULL' allows other +** macros using this one to be used where L is not available. +*/ +#define checkliveness(L,obj) \ + ((void)L, lua_longassert(!iscollectable(obj) || \ + (righttt(obj) && (L == NULL || !isdead(G(L),gcvalue(obj)))))) + + +/* Macros to set values */ + +/* set a value's tag */ +#define settt_(o,t) ((o)->tt_=(t)) + + +/* main macro to copy values (from 'obj2' to 'obj1') */ +#define setobj(L,obj1,obj2) \ + { TValue *io1=(obj1); const TValue *io2=(obj2); \ + io1->value_ = io2->value_; settt_(io1, io2->tt_); \ + checkliveness(L,io1); lua_assert(!isnonstrictnil(io1)); } + +/* +** Different types of assignments, according to source and destination. +** (They are mostly equal now, but may be different in the future.) +*/ + +/* from stack to stack */ +#define setobjs2s(L,o1,o2) setobj(L,s2v(o1),s2v(o2)) +/* to stack (not from same stack) */ +#define setobj2s(L,o1,o2) setobj(L,s2v(o1),o2) +/* from table to same table */ +#define setobjt2t setobj +/* to new object */ +#define setobj2n setobj +/* to table */ +#define setobj2t setobj + + +/* +** Entries in a Lua stack. Field 'tbclist' forms a list of all +** to-be-closed variables active in this stack. Dummy entries are +** used when the distance between two tbc variables does not fit +** in an unsigned short. They are represented by delta==0, and +** their real delta is always the maximum value that fits in +** that field. +*/ +typedef union StackValue { + TValue val; + struct { + TValuefields; + unsigned short delta; + } tbclist; +} StackValue; + + +/* index to stack elements */ +typedef StackValue *StkId; + + +/* +** When reallocating the stack, change all pointers to the stack into +** proper offsets. +*/ +typedef union { + StkId p; /* actual pointer */ + ptrdiff_t offset; /* used while the stack is being reallocated */ +} StkIdRel; + + +/* convert a 'StackValue' to a 'TValue' */ +#define s2v(o) (&(o)->val) + + + +/* +** {================================================================== +** Nil +** =================================================================== +*/ + +/* Standard nil */ +#define LUA_VNIL makevariant(LUA_TNIL, 0) + +/* Empty slot (which might be different from a slot containing nil) */ +#define LUA_VEMPTY makevariant(LUA_TNIL, 1) + +/* Value returned for a key not found in a table (absent key) */ +#define LUA_VABSTKEY makevariant(LUA_TNIL, 2) + + +/* macro to test for (any kind of) nil */ +#define ttisnil(v) checktype((v), LUA_TNIL) + + +/* macro to test for a standard nil */ +#define ttisstrictnil(o) checktag((o), LUA_VNIL) + + +#define setnilvalue(obj) settt_(obj, LUA_VNIL) + + +#define isabstkey(v) checktag((v), LUA_VABSTKEY) + + +/* +** macro to detect non-standard nils (used only in assertions) +*/ +#define isnonstrictnil(v) (ttisnil(v) && !ttisstrictnil(v)) + + +/* +** By default, entries with any kind of nil are considered empty. +** (In any definition, values associated with absent keys must also +** be accepted as empty.) +*/ +#define isempty(v) ttisnil(v) + + +/* macro defining a value corresponding to an absent key */ +#define ABSTKEYCONSTANT {NULL}, LUA_VABSTKEY + + +/* mark an entry as empty */ +#define setempty(v) settt_(v, LUA_VEMPTY) + + + +/* }================================================================== */ + + +/* +** {================================================================== +** Booleans +** =================================================================== +*/ + + +#define LUA_VFALSE makevariant(LUA_TBOOLEAN, 0) +#define LUA_VTRUE makevariant(LUA_TBOOLEAN, 1) + +#define ttisboolean(o) checktype((o), LUA_TBOOLEAN) +#define ttisfalse(o) checktag((o), LUA_VFALSE) +#define ttistrue(o) checktag((o), LUA_VTRUE) + + +#define l_isfalse(o) (ttisfalse(o) || ttisnil(o)) + + +#define setbfvalue(obj) settt_(obj, LUA_VFALSE) +#define setbtvalue(obj) settt_(obj, LUA_VTRUE) + +/* }================================================================== */ + + +/* +** {================================================================== +** Threads +** =================================================================== +*/ + +#define LUA_VTHREAD makevariant(LUA_TTHREAD, 0) + +#define ttisthread(o) checktag((o), ctb(LUA_VTHREAD)) + +#define thvalue(o) check_exp(ttisthread(o), gco2th(val_(o).gc)) + +#define setthvalue(L,obj,x) \ + { TValue *io = (obj); lua_State *x_ = (x); \ + val_(io).gc = obj2gco(x_); settt_(io, ctb(LUA_VTHREAD)); \ + checkliveness(L,io); } + +#define setthvalue2s(L,o,t) setthvalue(L,s2v(o),t) + +/* }================================================================== */ + + +/* +** {================================================================== +** Collectable Objects +** =================================================================== +*/ + +/* +** Common Header for all collectable objects (in macro form, to be +** included in other objects) +*/ +#define CommonHeader struct GCObject *next; lu_byte tt; lu_byte marked + + +/* Common type for all collectable objects */ +typedef struct GCObject { + CommonHeader; +} GCObject; + + +/* Bit mark for collectable types */ +#define BIT_ISCOLLECTABLE (1 << 6) + +#define iscollectable(o) (rawtt(o) & BIT_ISCOLLECTABLE) + +/* mark a tag as collectable */ +#define ctb(t) ((t) | BIT_ISCOLLECTABLE) + +#define gcvalue(o) check_exp(iscollectable(o), val_(o).gc) + +#define gcvalueraw(v) ((v).gc) + +#define setgcovalue(L,obj,x) \ + { TValue *io = (obj); GCObject *i_g=(x); \ + val_(io).gc = i_g; settt_(io, ctb(i_g->tt)); } + +/* }================================================================== */ + + +/* +** {================================================================== +** Numbers +** =================================================================== +*/ + +/* Variant tags for numbers */ +#define LUA_VNUMINT makevariant(LUA_TNUMBER, 0) /* integer numbers */ +#define LUA_VNUMFLT makevariant(LUA_TNUMBER, 1) /* float numbers */ + +#define ttisnumber(o) checktype((o), LUA_TNUMBER) +#define ttisfloat(o) checktag((o), LUA_VNUMFLT) +#define ttisinteger(o) checktag((o), LUA_VNUMINT) + +#define nvalue(o) check_exp(ttisnumber(o), \ + (ttisinteger(o) ? cast_num(ivalue(o)) : fltvalue(o))) +#define fltvalue(o) check_exp(ttisfloat(o), val_(o).n) +#define ivalue(o) check_exp(ttisinteger(o), val_(o).i) + +#define fltvalueraw(v) ((v).n) +#define ivalueraw(v) ((v).i) + +#define setfltvalue(obj,x) \ + { TValue *io=(obj); val_(io).n=(x); settt_(io, LUA_VNUMFLT); } + +#define chgfltvalue(obj,x) \ + { TValue *io=(obj); lua_assert(ttisfloat(io)); val_(io).n=(x); } + +#define setivalue(obj,x) \ + { TValue *io=(obj); val_(io).i=(x); settt_(io, LUA_VNUMINT); } + +#define chgivalue(obj,x) \ + { TValue *io=(obj); lua_assert(ttisinteger(io)); val_(io).i=(x); } + +/* }================================================================== */ + + +/* +** {================================================================== +** Strings +** =================================================================== +*/ + +/* Variant tags for strings */ +#define LUA_VSHRSTR makevariant(LUA_TSTRING, 0) /* short strings */ +#define LUA_VLNGSTR makevariant(LUA_TSTRING, 1) /* long strings */ + +#define ttisstring(o) checktype((o), LUA_TSTRING) +#define ttisshrstring(o) checktag((o), ctb(LUA_VSHRSTR)) +#define ttislngstring(o) checktag((o), ctb(LUA_VLNGSTR)) + +#define tsvalueraw(v) (gco2ts((v).gc)) + +#define tsvalue(o) check_exp(ttisstring(o), gco2ts(val_(o).gc)) + +#define setsvalue(L,obj,x) \ + { TValue *io = (obj); TString *x_ = (x); \ + val_(io).gc = obj2gco(x_); settt_(io, ctb(x_->tt)); \ + checkliveness(L,io); } + +/* set a string to the stack */ +#define setsvalue2s(L,o,s) setsvalue(L,s2v(o),s) + +/* set a string to a new object */ +#define setsvalue2n setsvalue + + +/* +** Header for a string value. +*/ +typedef struct TString { + CommonHeader; + lu_byte extra; /* reserved words for short strings; "has hash" for longs */ + lu_byte shrlen; /* length for short strings */ + unsigned int hash; + union { + size_t lnglen; /* length for long strings */ + struct TString *hnext; /* linked list for hash table */ + } u; + char contents[1]; +} TString; + + + +/* +** Get the actual string (array of bytes) from a 'TString'. +*/ +#define getstr(ts) ((ts)->contents) + + +/* get the actual string (array of bytes) from a Lua value */ +#define svalue(o) getstr(tsvalue(o)) + +/* get string length from 'TString *s' */ +#define tsslen(s) ((s)->tt == LUA_VSHRSTR ? (s)->shrlen : (s)->u.lnglen) + +/* get string length from 'TValue *o' */ +#define vslen(o) tsslen(tsvalue(o)) + +/* }================================================================== */ + + +/* +** {================================================================== +** Userdata +** =================================================================== +*/ + + +/* +** Light userdata should be a variant of userdata, but for compatibility +** reasons they are also different types. +*/ +#define LUA_VLIGHTUSERDATA makevariant(LUA_TLIGHTUSERDATA, 0) + +#define LUA_VUSERDATA makevariant(LUA_TUSERDATA, 0) + +#define ttislightuserdata(o) checktag((o), LUA_VLIGHTUSERDATA) +#define ttisfulluserdata(o) checktag((o), ctb(LUA_VUSERDATA)) + +#define pvalue(o) check_exp(ttislightuserdata(o), val_(o).p) +#define uvalue(o) check_exp(ttisfulluserdata(o), gco2u(val_(o).gc)) + +#define pvalueraw(v) ((v).p) + +#define setpvalue(obj,x) \ + { TValue *io=(obj); val_(io).p=(x); settt_(io, LUA_VLIGHTUSERDATA); } + +#define setuvalue(L,obj,x) \ + { TValue *io = (obj); Udata *x_ = (x); \ + val_(io).gc = obj2gco(x_); settt_(io, ctb(LUA_VUSERDATA)); \ + checkliveness(L,io); } + + +/* Ensures that addresses after this type are always fully aligned. */ +typedef union UValue { + TValue uv; + LUAI_MAXALIGN; /* ensures maximum alignment for udata bytes */ +} UValue; + + +/* +** Header for userdata with user values; +** memory area follows the end of this structure. +*/ +typedef struct Udata { + CommonHeader; + unsigned short nuvalue; /* number of user values */ + size_t len; /* number of bytes */ + struct Table *metatable; + GCObject *gclist; + UValue uv[1]; /* user values */ +} Udata; + + +/* +** Header for userdata with no user values. These userdata do not need +** to be gray during GC, and therefore do not need a 'gclist' field. +** To simplify, the code always use 'Udata' for both kinds of userdata, +** making sure it never accesses 'gclist' on userdata with no user values. +** This structure here is used only to compute the correct size for +** this representation. (The 'bindata' field in its end ensures correct +** alignment for binary data following this header.) +*/ +typedef struct Udata0 { + CommonHeader; + unsigned short nuvalue; /* number of user values */ + size_t len; /* number of bytes */ + struct Table *metatable; + union {LUAI_MAXALIGN;} bindata; +} Udata0; + + +/* compute the offset of the memory area of a userdata */ +#define udatamemoffset(nuv) \ + ((nuv) == 0 ? offsetof(Udata0, bindata) \ + : offsetof(Udata, uv) + (sizeof(UValue) * (nuv))) + +/* get the address of the memory block inside 'Udata' */ +#define getudatamem(u) (cast_charp(u) + udatamemoffset((u)->nuvalue)) + +/* compute the size of a userdata */ +#define sizeudata(nuv,nb) (udatamemoffset(nuv) + (nb)) + +/* }================================================================== */ + + +/* +** {================================================================== +** Prototypes +** =================================================================== +*/ + +#define LUA_VPROTO makevariant(LUA_TPROTO, 0) + + +/* +** Description of an upvalue for function prototypes +*/ +typedef struct Upvaldesc { + TString *name; /* upvalue name (for debug information) */ + lu_byte instack; /* whether it is in stack (register) */ + lu_byte idx; /* index of upvalue (in stack or in outer function's list) */ + lu_byte kind; /* kind of corresponding variable */ +} Upvaldesc; + + +/* +** Description of a local variable for function prototypes +** (used for debug information) +*/ +typedef struct LocVar { + TString *varname; + int startpc; /* first point where variable is active */ + int endpc; /* first point where variable is dead */ +} LocVar; + + +/* +** Associates the absolute line source for a given instruction ('pc'). +** The array 'lineinfo' gives, for each instruction, the difference in +** lines from the previous instruction. When that difference does not +** fit into a byte, Lua saves the absolute line for that instruction. +** (Lua also saves the absolute line periodically, to speed up the +** computation of a line number: we can use binary search in the +** absolute-line array, but we must traverse the 'lineinfo' array +** linearly to compute a line.) +*/ +typedef struct AbsLineInfo { + int pc; + int line; +} AbsLineInfo; + +/* +** Function Prototypes +*/ +typedef struct Proto { + CommonHeader; + lu_byte numparams; /* number of fixed (named) parameters */ + lu_byte is_vararg; + lu_byte maxstacksize; /* number of registers needed by this function */ + int sizeupvalues; /* size of 'upvalues' */ + int sizek; /* size of 'k' */ + int sizecode; + int sizelineinfo; + int sizep; /* size of 'p' */ + int sizelocvars; + int sizeabslineinfo; /* size of 'abslineinfo' */ + int linedefined; /* debug information */ + int lastlinedefined; /* debug information */ + TValue *k; /* constants used by the function */ + Instruction *code; /* opcodes */ + struct Proto **p; /* functions defined inside the function */ + Upvaldesc *upvalues; /* upvalue information */ + ls_byte *lineinfo; /* information about source lines (debug information) */ + AbsLineInfo *abslineinfo; /* idem */ + LocVar *locvars; /* information about local variables (debug information) */ + TString *source; /* used for debug information */ + GCObject *gclist; +} Proto; + +/* }================================================================== */ + + +/* +** {================================================================== +** Functions +** =================================================================== +*/ + +#define LUA_VUPVAL makevariant(LUA_TUPVAL, 0) + + +/* Variant tags for functions */ +#define LUA_VLCL makevariant(LUA_TFUNCTION, 0) /* Lua closure */ +#define LUA_VLCF makevariant(LUA_TFUNCTION, 1) /* light C function */ +#define LUA_VCCL makevariant(LUA_TFUNCTION, 2) /* C closure */ + +#define ttisfunction(o) checktype(o, LUA_TFUNCTION) +#define ttisLclosure(o) checktag((o), ctb(LUA_VLCL)) +#define ttislcf(o) checktag((o), LUA_VLCF) +#define ttisCclosure(o) checktag((o), ctb(LUA_VCCL)) +#define ttisclosure(o) (ttisLclosure(o) || ttisCclosure(o)) + + +#define isLfunction(o) ttisLclosure(o) + +#define clvalue(o) check_exp(ttisclosure(o), gco2cl(val_(o).gc)) +#define clLvalue(o) check_exp(ttisLclosure(o), gco2lcl(val_(o).gc)) +#define fvalue(o) check_exp(ttislcf(o), val_(o).f) +#define clCvalue(o) check_exp(ttisCclosure(o), gco2ccl(val_(o).gc)) + +#define fvalueraw(v) ((v).f) + +#define setclLvalue(L,obj,x) \ + { TValue *io = (obj); LClosure *x_ = (x); \ + val_(io).gc = obj2gco(x_); settt_(io, ctb(LUA_VLCL)); \ + checkliveness(L,io); } + +#define setclLvalue2s(L,o,cl) setclLvalue(L,s2v(o),cl) + +#define setfvalue(obj,x) \ + { TValue *io=(obj); val_(io).f=(x); settt_(io, LUA_VLCF); } + +#define setclCvalue(L,obj,x) \ + { TValue *io = (obj); CClosure *x_ = (x); \ + val_(io).gc = obj2gco(x_); settt_(io, ctb(LUA_VCCL)); \ + checkliveness(L,io); } + + +/* +** Upvalues for Lua closures +*/ +typedef struct UpVal { + CommonHeader; + union { + TValue *p; /* points to stack or to its own value */ + ptrdiff_t offset; /* used while the stack is being reallocated */ + } v; + union { + struct { /* (when open) */ + struct UpVal *next; /* linked list */ + struct UpVal **previous; + } open; + TValue value; /* the value (when closed) */ + } u; +} UpVal; + + + +#define ClosureHeader \ + CommonHeader; lu_byte nupvalues; GCObject *gclist + +typedef struct CClosure { + ClosureHeader; + lua_CFunction f; + TValue upvalue[1]; /* list of upvalues */ +} CClosure; + + +typedef struct LClosure { + ClosureHeader; + struct Proto *p; + UpVal *upvals[1]; /* list of upvalues */ +} LClosure; + + +typedef union Closure { + CClosure c; + LClosure l; +} Closure; + + +#define getproto(o) (clLvalue(o)->p) + +/* }================================================================== */ + + +/* +** {================================================================== +** Tables +** =================================================================== +*/ + +#define LUA_VTABLE makevariant(LUA_TTABLE, 0) + +#define ttistable(o) checktag((o), ctb(LUA_VTABLE)) + +#define hvalue(o) check_exp(ttistable(o), gco2t(val_(o).gc)) + +#define sethvalue(L,obj,x) \ + { TValue *io = (obj); Table *x_ = (x); \ + val_(io).gc = obj2gco(x_); settt_(io, ctb(LUA_VTABLE)); \ + checkliveness(L,io); } + +#define sethvalue2s(L,o,h) sethvalue(L,s2v(o),h) + + +/* +** Nodes for Hash tables: A pack of two TValue's (key-value pairs) +** plus a 'next' field to link colliding entries. The distribution +** of the key's fields ('key_tt' and 'key_val') not forming a proper +** 'TValue' allows for a smaller size for 'Node' both in 4-byte +** and 8-byte alignments. +*/ +typedef union Node { + struct NodeKey { + TValuefields; /* fields for value */ + lu_byte key_tt; /* key type */ + int next; /* for chaining */ + Value key_val; /* key value */ + } u; + TValue i_val; /* direct access to node's value as a proper 'TValue' */ +} Node; + + +/* copy a value into a key */ +#define setnodekey(L,node,obj) \ + { Node *n_=(node); const TValue *io_=(obj); \ + n_->u.key_val = io_->value_; n_->u.key_tt = io_->tt_; \ + checkliveness(L,io_); } + + +/* copy a value from a key */ +#define getnodekey(L,obj,node) \ + { TValue *io_=(obj); const Node *n_=(node); \ + io_->value_ = n_->u.key_val; io_->tt_ = n_->u.key_tt; \ + checkliveness(L,io_); } + + +/* +** About 'alimit': if 'isrealasize(t)' is true, then 'alimit' is the +** real size of 'array'. Otherwise, the real size of 'array' is the +** smallest power of two not smaller than 'alimit' (or zero iff 'alimit' +** is zero); 'alimit' is then used as a hint for #t. +*/ + +#define BITRAS (1 << 7) +#define isrealasize(t) (!((t)->flags & BITRAS)) +#define setrealasize(t) ((t)->flags &= cast_byte(~BITRAS)) +#define setnorealasize(t) ((t)->flags |= BITRAS) + + +typedef struct Table { + CommonHeader; + lu_byte flags; /* 1<

u.key_tt) +#define keyval(node) ((node)->u.key_val) + +#define keyisnil(node) (keytt(node) == LUA_TNIL) +#define keyisinteger(node) (keytt(node) == LUA_VNUMINT) +#define keyival(node) (keyval(node).i) +#define keyisshrstr(node) (keytt(node) == ctb(LUA_VSHRSTR)) +#define keystrval(node) (gco2ts(keyval(node).gc)) + +#define setnilkey(node) (keytt(node) = LUA_TNIL) + +#define keyiscollectable(n) (keytt(n) & BIT_ISCOLLECTABLE) + +#define gckey(n) (keyval(n).gc) +#define gckeyN(n) (keyiscollectable(n) ? gckey(n) : NULL) + + +/* +** Dead keys in tables have the tag DEADKEY but keep their original +** gcvalue. This distinguishes them from regular keys but allows them to +** be found when searched in a special way. ('next' needs that to find +** keys removed from a table during a traversal.) +*/ +#define setdeadkey(node) (keytt(node) = LUA_TDEADKEY) +#define keyisdead(node) (keytt(node) == LUA_TDEADKEY) + +/* }================================================================== */ + + + +/* +** 'module' operation for hashing (size is always a power of 2) +*/ +#define lmod(s,size) \ + (check_exp((size&(size-1))==0, (cast_int((s) & ((size)-1))))) + + +#define twoto(x) (1<<(x)) +#define sizenode(t) (twoto((t)->lsizenode)) + + +/* size of buffer for 'luaO_utf8esc' function */ +#define UTF8BUFFSZ 8 + +LUAI_FUNC int luaO_utf8esc (char *buff, unsigned long x); +LUAI_FUNC int luaO_ceillog2 (unsigned int x); +LUAI_FUNC int luaO_rawarith (lua_State *L, int op, const TValue *p1, + const TValue *p2, TValue *res); +LUAI_FUNC void luaO_arith (lua_State *L, int op, const TValue *p1, + const TValue *p2, StkId res); +LUAI_FUNC size_t luaO_str2num (const char *s, TValue *o); +LUAI_FUNC int luaO_hexavalue (int c); +LUAI_FUNC void luaO_tostring (lua_State *L, TValue *obj); +LUAI_FUNC const char *luaO_pushvfstring (lua_State *L, const char *fmt, + va_list argp); +LUAI_FUNC const char *luaO_pushfstring (lua_State *L, const char *fmt, ...); +LUAI_FUNC void luaO_chunkid (char *out, const char *source, size_t srclen); + + +#endif + diff --git a/06/lua-5.4.6/src/lopcodes.c b/06/lua-5.4.6/src/lopcodes.c new file mode 100644 index 0000000..c67aa22 --- /dev/null +++ b/06/lua-5.4.6/src/lopcodes.c @@ -0,0 +1,104 @@ +/* +** $Id: lopcodes.c $ +** Opcodes for Lua virtual machine +** See Copyright Notice in lua.h +*/ + +#define lopcodes_c +#define LUA_CORE + +#include "lprefix.h" + + +#include "lopcodes.h" + + +/* ORDER OP */ + +LUAI_DDEF const lu_byte luaP_opmodes[NUM_OPCODES] = { +/* MM OT IT T A mode opcode */ + opmode(0, 0, 0, 0, 1, iABC) /* OP_MOVE */ + ,opmode(0, 0, 0, 0, 1, iAsBx) /* OP_LOADI */ + ,opmode(0, 0, 0, 0, 1, iAsBx) /* OP_LOADF */ + ,opmode(0, 0, 0, 0, 1, iABx) /* OP_LOADK */ + ,opmode(0, 0, 0, 0, 1, iABx) /* OP_LOADKX */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_LOADFALSE */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_LFALSESKIP */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_LOADTRUE */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_LOADNIL */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_GETUPVAL */ + ,opmode(0, 0, 0, 0, 0, iABC) /* OP_SETUPVAL */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_GETTABUP */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_GETTABLE */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_GETI */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_GETFIELD */ + ,opmode(0, 0, 0, 0, 0, iABC) /* OP_SETTABUP */ + ,opmode(0, 0, 0, 0, 0, iABC) /* OP_SETTABLE */ + ,opmode(0, 0, 0, 0, 0, iABC) /* OP_SETI */ + ,opmode(0, 0, 0, 0, 0, iABC) /* OP_SETFIELD */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_NEWTABLE */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_SELF */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_ADDI */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_ADDK */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_SUBK */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_MULK */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_MODK */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_POWK */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_DIVK */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_IDIVK */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_BANDK */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_BORK */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_BXORK */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_SHRI */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_SHLI */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_ADD */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_SUB */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_MUL */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_MOD */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_POW */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_DIV */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_IDIV */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_BAND */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_BOR */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_BXOR */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_SHL */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_SHR */ + ,opmode(1, 0, 0, 0, 0, iABC) /* OP_MMBIN */ + ,opmode(1, 0, 0, 0, 0, iABC) /* OP_MMBINI*/ + ,opmode(1, 0, 0, 0, 0, iABC) /* OP_MMBINK*/ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_UNM */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_BNOT */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_NOT */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_LEN */ + ,opmode(0, 0, 0, 0, 1, iABC) /* OP_CONCAT */ + ,opmode(0, 0, 0, 0, 0, iABC) /* OP_CLOSE */ + ,opmode(0, 0, 0, 0, 0, iABC) /* OP_TBC */ + ,opmode(0, 0, 0, 0, 0, isJ) /* OP_JMP */ + ,opmode(0, 0, 0, 1, 0, iABC) /* OP_EQ */ + ,opmode(0, 0, 0, 1, 0, iABC) /* OP_LT */ + ,opmode(0, 0, 0, 1, 0, iABC) /* OP_LE */ + ,opmode(0, 0, 0, 1, 0, iABC) /* OP_EQK */ + ,opmode(0, 0, 0, 1, 0, iABC) /* OP_EQI */ + ,opmode(0, 0, 0, 1, 0, iABC) /* OP_LTI */ + ,opmode(0, 0, 0, 1, 0, iABC) /* OP_LEI */ + ,opmode(0, 0, 0, 1, 0, iABC) /* OP_GTI */ + ,opmode(0, 0, 0, 1, 0, iABC) /* OP_GEI */ + ,opmode(0, 0, 0, 1, 0, iABC) /* OP_TEST */ + ,opmode(0, 0, 0, 1, 1, iABC) /* OP_TESTSET */ + ,opmode(0, 1, 1, 0, 1, iABC) /* OP_CALL */ + ,opmode(0, 1, 1, 0, 1, iABC) /* OP_TAILCALL */ + ,opmode(0, 0, 1, 0, 0, iABC) /* OP_RETURN */ + ,opmode(0, 0, 0, 0, 0, iABC) /* OP_RETURN0 */ + ,opmode(0, 0, 0, 0, 0, iABC) /* OP_RETURN1 */ + ,opmode(0, 0, 0, 0, 1, iABx) /* OP_FORLOOP */ + ,opmode(0, 0, 0, 0, 1, iABx) /* OP_FORPREP */ + ,opmode(0, 0, 0, 0, 0, iABx) /* OP_TFORPREP */ + ,opmode(0, 0, 0, 0, 0, iABC) /* OP_TFORCALL */ + ,opmode(0, 0, 0, 0, 1, iABx) /* OP_TFORLOOP */ + ,opmode(0, 0, 1, 0, 0, iABC) /* OP_SETLIST */ + ,opmode(0, 0, 0, 0, 1, iABx) /* OP_CLOSURE */ + ,opmode(0, 1, 0, 0, 1, iABC) /* OP_VARARG */ + ,opmode(0, 0, 1, 0, 1, iABC) /* OP_VARARGPREP */ + ,opmode(0, 0, 0, 0, 0, iAx) /* OP_EXTRAARG */ +}; + diff --git a/06/lua-5.4.6/src/lopcodes.h b/06/lua-5.4.6/src/lopcodes.h new file mode 100644 index 0000000..4c55145 --- /dev/null +++ b/06/lua-5.4.6/src/lopcodes.h @@ -0,0 +1,405 @@ +/* +** $Id: lopcodes.h $ +** Opcodes for Lua virtual machine +** See Copyright Notice in lua.h +*/ + +#ifndef lopcodes_h +#define lopcodes_h + +#include "llimits.h" + + +/*=========================================================================== + We assume that instructions are unsigned 32-bit integers. + All instructions have an opcode in the first 7 bits. + Instructions can have the following formats: + + 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 + 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 +iABC C(8) | B(8) |k| A(8) | Op(7) | +iABx Bx(17) | A(8) | Op(7) | +iAsBx sBx (signed)(17) | A(8) | Op(7) | +iAx Ax(25) | Op(7) | +isJ sJ (signed)(25) | Op(7) | + + A signed argument is represented in excess K: the represented value is + the written unsigned value minus K, where K is half the maximum for the + corresponding unsigned argument. +===========================================================================*/ + + +enum OpMode {iABC, iABx, iAsBx, iAx, isJ}; /* basic instruction formats */ + + +/* +** size and position of opcode arguments. +*/ +#define SIZE_C 8 +#define SIZE_B 8 +#define SIZE_Bx (SIZE_C + SIZE_B + 1) +#define SIZE_A 8 +#define SIZE_Ax (SIZE_Bx + SIZE_A) +#define SIZE_sJ (SIZE_Bx + SIZE_A) + +#define SIZE_OP 7 + +#define POS_OP 0 + +#define POS_A (POS_OP + SIZE_OP) +#define POS_k (POS_A + SIZE_A) +#define POS_B (POS_k + 1) +#define POS_C (POS_B + SIZE_B) + +#define POS_Bx POS_k + +#define POS_Ax POS_A + +#define POS_sJ POS_A + + +/* +** limits for opcode arguments. +** we use (signed) 'int' to manipulate most arguments, +** so they must fit in ints. +*/ + +/* Check whether type 'int' has at least 'b' bits ('b' < 32) */ +#define L_INTHASBITS(b) ((UINT_MAX >> ((b) - 1)) >= 1) + + +#if L_INTHASBITS(SIZE_Bx) +#define MAXARG_Bx ((1<>1) /* 'sBx' is signed */ + + +#if L_INTHASBITS(SIZE_Ax) +#define MAXARG_Ax ((1<> 1) + + +#define MAXARG_A ((1<> 1) + +#define int2sC(i) ((i) + OFFSET_sC) +#define sC2int(i) ((i) - OFFSET_sC) + + +/* creates a mask with 'n' 1 bits at position 'p' */ +#define MASK1(n,p) ((~((~(Instruction)0)<<(n)))<<(p)) + +/* creates a mask with 'n' 0 bits at position 'p' */ +#define MASK0(n,p) (~MASK1(n,p)) + +/* +** the following macros help to manipulate instructions +*/ + +#define GET_OPCODE(i) (cast(OpCode, ((i)>>POS_OP) & MASK1(SIZE_OP,0))) +#define SET_OPCODE(i,o) ((i) = (((i)&MASK0(SIZE_OP,POS_OP)) | \ + ((cast(Instruction, o)<>(pos)) & MASK1(size,0))) +#define setarg(i,v,pos,size) ((i) = (((i)&MASK0(size,pos)) | \ + ((cast(Instruction, v)<> sC */ +OP_SHLI,/* A B sC R[A] := sC << R[B] */ + +OP_ADD,/* A B C R[A] := R[B] + R[C] */ +OP_SUB,/* A B C R[A] := R[B] - R[C] */ +OP_MUL,/* A B C R[A] := R[B] * R[C] */ +OP_MOD,/* A B C R[A] := R[B] % R[C] */ +OP_POW,/* A B C R[A] := R[B] ^ R[C] */ +OP_DIV,/* A B C R[A] := R[B] / R[C] */ +OP_IDIV,/* A B C R[A] := R[B] // R[C] */ + +OP_BAND,/* A B C R[A] := R[B] & R[C] */ +OP_BOR,/* A B C R[A] := R[B] | R[C] */ +OP_BXOR,/* A B C R[A] := R[B] ~ R[C] */ +OP_SHL,/* A B C R[A] := R[B] << R[C] */ +OP_SHR,/* A B C R[A] := R[B] >> R[C] */ + +OP_MMBIN,/* A B C call C metamethod over R[A] and R[B] (*) */ +OP_MMBINI,/* A sB C k call C metamethod over R[A] and sB */ +OP_MMBINK,/* A B C k call C metamethod over R[A] and K[B] */ + +OP_UNM,/* A B R[A] := -R[B] */ +OP_BNOT,/* A B R[A] := ~R[B] */ +OP_NOT,/* A B R[A] := not R[B] */ +OP_LEN,/* A B R[A] := #R[B] (length operator) */ + +OP_CONCAT,/* A B R[A] := R[A].. ... ..R[A + B - 1] */ + +OP_CLOSE,/* A close all upvalues >= R[A] */ +OP_TBC,/* A mark variable A "to be closed" */ +OP_JMP,/* sJ pc += sJ */ +OP_EQ,/* A B k if ((R[A] == R[B]) ~= k) then pc++ */ +OP_LT,/* A B k if ((R[A] < R[B]) ~= k) then pc++ */ +OP_LE,/* A B k if ((R[A] <= R[B]) ~= k) then pc++ */ + +OP_EQK,/* A B k if ((R[A] == K[B]) ~= k) then pc++ */ +OP_EQI,/* A sB k if ((R[A] == sB) ~= k) then pc++ */ +OP_LTI,/* A sB k if ((R[A] < sB) ~= k) then pc++ */ +OP_LEI,/* A sB k if ((R[A] <= sB) ~= k) then pc++ */ +OP_GTI,/* A sB k if ((R[A] > sB) ~= k) then pc++ */ +OP_GEI,/* A sB k if ((R[A] >= sB) ~= k) then pc++ */ + +OP_TEST,/* A k if (not R[A] == k) then pc++ */ +OP_TESTSET,/* A B k if (not R[B] == k) then pc++ else R[A] := R[B] (*) */ + +OP_CALL,/* A B C R[A], ... ,R[A+C-2] := R[A](R[A+1], ... ,R[A+B-1]) */ +OP_TAILCALL,/* A B C k return R[A](R[A+1], ... ,R[A+B-1]) */ + +OP_RETURN,/* A B C k return R[A], ... ,R[A+B-2] (see note) */ +OP_RETURN0,/* return */ +OP_RETURN1,/* A return R[A] */ + +OP_FORLOOP,/* A Bx update counters; if loop continues then pc-=Bx; */ +OP_FORPREP,/* A Bx ; + if not to run then pc+=Bx+1; */ + +OP_TFORPREP,/* A Bx create upvalue for R[A + 3]; pc+=Bx */ +OP_TFORCALL,/* A C R[A+4], ... ,R[A+3+C] := R[A](R[A+1], R[A+2]); */ +OP_TFORLOOP,/* A Bx if R[A+2] ~= nil then { R[A]=R[A+2]; pc -= Bx } */ + +OP_SETLIST,/* A B C k R[A][C+i] := R[A+i], 1 <= i <= B */ + +OP_CLOSURE,/* A Bx R[A] := closure(KPROTO[Bx]) */ + +OP_VARARG,/* A C R[A], R[A+1], ..., R[A+C-2] = vararg */ + +OP_VARARGPREP,/*A (adjust vararg parameters) */ + +OP_EXTRAARG/* Ax extra (larger) argument for previous opcode */ +} OpCode; + + +#define NUM_OPCODES ((int)(OP_EXTRAARG) + 1) + + + +/*=========================================================================== + Notes: + + (*) Opcode OP_LFALSESKIP is used to convert a condition to a boolean + value, in a code equivalent to (not cond ? false : true). (It + produces false and skips the next instruction producing true.) + + (*) Opcodes OP_MMBIN and variants follow each arithmetic and + bitwise opcode. If the operation succeeds, it skips this next + opcode. Otherwise, this opcode calls the corresponding metamethod. + + (*) Opcode OP_TESTSET is used in short-circuit expressions that need + both to jump and to produce a value, such as (a = b or c). + + (*) In OP_CALL, if (B == 0) then B = top - A. If (C == 0), then + 'top' is set to last_result+1, so next open instruction (OP_CALL, + OP_RETURN*, OP_SETLIST) may use 'top'. + + (*) In OP_VARARG, if (C == 0) then use actual number of varargs and + set top (like in OP_CALL with C == 0). + + (*) In OP_RETURN, if (B == 0) then return up to 'top'. + + (*) In OP_LOADKX and OP_NEWTABLE, the next instruction is always + OP_EXTRAARG. + + (*) In OP_SETLIST, if (B == 0) then real B = 'top'; if k, then + real C = EXTRAARG _ C (the bits of EXTRAARG concatenated with the + bits of C). + + (*) In OP_NEWTABLE, B is log2 of the hash size (which is always a + power of 2) plus 1, or zero for size zero. If not k, the array size + is C. Otherwise, the array size is EXTRAARG _ C. + + (*) For comparisons, k specifies what condition the test should accept + (true or false). + + (*) In OP_MMBINI/OP_MMBINK, k means the arguments were flipped + (the constant is the first operand). + + (*) All 'skips' (pc++) assume that next instruction is a jump. + + (*) In instructions OP_RETURN/OP_TAILCALL, 'k' specifies that the + function builds upvalues, which may need to be closed. C > 0 means + the function is vararg, so that its 'func' must be corrected before + returning; in this case, (C - 1) is its number of fixed parameters. + + (*) In comparisons with an immediate operand, C signals whether the + original operand was a float. (It must be corrected in case of + metamethods.) + +===========================================================================*/ + + +/* +** masks for instruction properties. The format is: +** bits 0-2: op mode +** bit 3: instruction set register A +** bit 4: operator is a test (next instruction must be a jump) +** bit 5: instruction uses 'L->top' set by previous instruction (when B == 0) +** bit 6: instruction sets 'L->top' for next instruction (when C == 0) +** bit 7: instruction is an MM instruction (call a metamethod) +*/ + +LUAI_DDEC(const lu_byte luaP_opmodes[NUM_OPCODES];) + +#define getOpMode(m) (cast(enum OpMode, luaP_opmodes[m] & 7)) +#define testAMode(m) (luaP_opmodes[m] & (1 << 3)) +#define testTMode(m) (luaP_opmodes[m] & (1 << 4)) +#define testITMode(m) (luaP_opmodes[m] & (1 << 5)) +#define testOTMode(m) (luaP_opmodes[m] & (1 << 6)) +#define testMMMode(m) (luaP_opmodes[m] & (1 << 7)) + +/* "out top" (set top for next instruction) */ +#define isOT(i) \ + ((testOTMode(GET_OPCODE(i)) && GETARG_C(i) == 0) || \ + GET_OPCODE(i) == OP_TAILCALL) + +/* "in top" (uses top from previous instruction) */ +#define isIT(i) (testITMode(GET_OPCODE(i)) && GETARG_B(i) == 0) + +#define opmode(mm,ot,it,t,a,m) \ + (((mm) << 7) | ((ot) << 6) | ((it) << 5) | ((t) << 4) | ((a) << 3) | (m)) + + +/* number of list items to accumulate before a SETLIST instruction */ +#define LFIELDS_PER_FLUSH 50 + +#endif diff --git a/06/lua-5.4.6/src/lopnames.h b/06/lua-5.4.6/src/lopnames.h new file mode 100644 index 0000000..965cec9 --- /dev/null +++ b/06/lua-5.4.6/src/lopnames.h @@ -0,0 +1,103 @@ +/* +** $Id: lopnames.h $ +** Opcode names +** See Copyright Notice in lua.h +*/ + +#if !defined(lopnames_h) +#define lopnames_h + +#include + + +/* ORDER OP */ + +static const char *const opnames[] = { + "MOVE", + "LOADI", + "LOADF", + "LOADK", + "LOADKX", + "LOADFALSE", + "LFALSESKIP", + "LOADTRUE", + "LOADNIL", + "GETUPVAL", + "SETUPVAL", + "GETTABUP", + "GETTABLE", + "GETI", + "GETFIELD", + "SETTABUP", + "SETTABLE", + "SETI", + "SETFIELD", + "NEWTABLE", + "SELF", + "ADDI", + "ADDK", + "SUBK", + "MULK", + "MODK", + "POWK", + "DIVK", + "IDIVK", + "BANDK", + "BORK", + "BXORK", + "SHRI", + "SHLI", + "ADD", + "SUB", + "MUL", + "MOD", + "POW", + "DIV", + "IDIV", + "BAND", + "BOR", + "BXOR", + "SHL", + "SHR", + "MMBIN", + "MMBINI", + "MMBINK", + "UNM", + "BNOT", + "NOT", + "LEN", + "CONCAT", + "CLOSE", + "TBC", + "JMP", + "EQ", + "LT", + "LE", + "EQK", + "EQI", + "LTI", + "LEI", + "GTI", + "GEI", + "TEST", + "TESTSET", + "CALL", + "TAILCALL", + "RETURN", + "RETURN0", + "RETURN1", + "FORLOOP", + "FORPREP", + "TFORPREP", + "TFORCALL", + "TFORLOOP", + "SETLIST", + "CLOSURE", + "VARARG", + "VARARGPREP", + "EXTRAARG", + NULL +}; + +#endif + diff --git a/06/lua-5.4.6/src/loslib.c b/06/lua-5.4.6/src/loslib.c new file mode 100644 index 0000000..ad5a927 --- /dev/null +++ b/06/lua-5.4.6/src/loslib.c @@ -0,0 +1,428 @@ +/* +** $Id: loslib.c $ +** Standard Operating System library +** See Copyright Notice in lua.h +*/ + +#define loslib_c +#define LUA_LIB + +#include "lprefix.h" + + +#include +#include +#include +#include +#include + +#include "lua.h" + +#include "lauxlib.h" +#include "lualib.h" + + +/* +** {================================================================== +** List of valid conversion specifiers for the 'strftime' function; +** options are grouped by length; group of length 2 start with '||'. +** =================================================================== +*/ +#if !defined(LUA_STRFTIMEOPTIONS) /* { */ + +#if defined(LUA_USE_WINDOWS) +#define LUA_STRFTIMEOPTIONS "aAbBcdHIjmMpSUwWxXyYzZ%" \ + "||" "#c#x#d#H#I#j#m#M#S#U#w#W#y#Y" /* two-char options */ +#elif defined(LUA_USE_C89) /* ANSI C 89 (only 1-char options) */ +#define LUA_STRFTIMEOPTIONS "aAbBcdHIjmMpSUwWxXyYZ%" +#else /* C99 specification */ +#define LUA_STRFTIMEOPTIONS "aAbBcCdDeFgGhHIjmMnprRStTuUVwWxXyYzZ%" \ + "||" "EcECExEXEyEY" "OdOeOHOIOmOMOSOuOUOVOwOWOy" /* two-char options */ +#endif + +#endif /* } */ +/* }================================================================== */ + + +/* +** {================================================================== +** Configuration for time-related stuff +** =================================================================== +*/ + +/* +** type to represent time_t in Lua +*/ +#if !defined(LUA_NUMTIME) /* { */ + +#define l_timet lua_Integer +#define l_pushtime(L,t) lua_pushinteger(L,(lua_Integer)(t)) +#define l_gettime(L,arg) luaL_checkinteger(L, arg) + +#else /* }{ */ + +#define l_timet lua_Number +#define l_pushtime(L,t) lua_pushnumber(L,(lua_Number)(t)) +#define l_gettime(L,arg) luaL_checknumber(L, arg) + +#endif /* } */ + + +#if !defined(l_gmtime) /* { */ +/* +** By default, Lua uses gmtime/localtime, except when POSIX is available, +** where it uses gmtime_r/localtime_r +*/ + +#if defined(LUA_USE_POSIX) /* { */ + +#define l_gmtime(t,r) gmtime_r(t,r) +#define l_localtime(t,r) localtime_r(t,r) + +#else /* }{ */ + +/* ISO C definitions */ +#define l_gmtime(t,r) ((void)(r)->tm_sec, gmtime(t)) +#define l_localtime(t,r) ((void)(r)->tm_sec, localtime(t)) + +#endif /* } */ + +#endif /* } */ + +/* }================================================================== */ + + +/* +** {================================================================== +** Configuration for 'tmpnam': +** By default, Lua uses tmpnam except when POSIX is available, where +** it uses mkstemp. +** =================================================================== +*/ +#if !defined(lua_tmpnam) /* { */ + +#if defined(LUA_USE_POSIX) /* { */ + +#include + +#define LUA_TMPNAMBUFSIZE 32 + +#if !defined(LUA_TMPNAMTEMPLATE) +#define LUA_TMPNAMTEMPLATE "/tmp/lua_XXXXXX" +#endif + +#define lua_tmpnam(b,e) { \ + strcpy(b, LUA_TMPNAMTEMPLATE); \ + e = mkstemp(b); \ + if (e != -1) close(e); \ + e = (e == -1); } + +#else /* }{ */ + +/* ISO C definitions */ +#define LUA_TMPNAMBUFSIZE L_tmpnam +#define lua_tmpnam(b,e) { e = (tmpnam(b) == NULL); } + +#endif /* } */ + +#endif /* } */ +/* }================================================================== */ + + +#if !defined(l_system) +#if defined(LUA_USE_IOS) +/* Despite claiming to be ISO C, iOS does not implement 'system'. */ +#define l_system(cmd) ((cmd) == NULL ? 0 : -1) +#else +#define l_system(cmd) system(cmd) /* default definition */ +#endif +#endif + + +static int os_execute (lua_State *L) { + const char *cmd = luaL_optstring(L, 1, NULL); + int stat; + errno = 0; + stat = l_system(cmd); + if (cmd != NULL) + return luaL_execresult(L, stat); + else { + lua_pushboolean(L, stat); /* true if there is a shell */ + return 1; + } +} + + +static int os_remove (lua_State *L) { + const char *filename = luaL_checkstring(L, 1); + return luaL_fileresult(L, remove(filename) == 0, filename); +} + + +static int os_rename (lua_State *L) { + const char *fromname = luaL_checkstring(L, 1); + const char *toname = luaL_checkstring(L, 2); + return luaL_fileresult(L, rename(fromname, toname) == 0, NULL); +} + + +static int os_tmpname (lua_State *L) { + char buff[LUA_TMPNAMBUFSIZE]; + int err; + lua_tmpnam(buff, err); + if (l_unlikely(err)) + return luaL_error(L, "unable to generate a unique filename"); + lua_pushstring(L, buff); + return 1; +} + + +static int os_getenv (lua_State *L) { + lua_pushstring(L, getenv(luaL_checkstring(L, 1))); /* if NULL push nil */ + return 1; +} + + +static int os_clock (lua_State *L) { + lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC); + return 1; +} + + +/* +** {====================================================== +** Time/Date operations +** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S, +** wday=%w+1, yday=%j, isdst=? } +** ======================================================= +*/ + +/* +** About the overflow check: an overflow cannot occur when time +** is represented by a lua_Integer, because either lua_Integer is +** large enough to represent all int fields or it is not large enough +** to represent a time that cause a field to overflow. However, if +** times are represented as doubles and lua_Integer is int, then the +** time 0x1.e1853b0d184f6p+55 would cause an overflow when adding 1900 +** to compute the year. +*/ +static void setfield (lua_State *L, const char *key, int value, int delta) { + #if (defined(LUA_NUMTIME) && LUA_MAXINTEGER <= INT_MAX) + if (l_unlikely(value > LUA_MAXINTEGER - delta)) + luaL_error(L, "field '%s' is out-of-bound", key); + #endif + lua_pushinteger(L, (lua_Integer)value + delta); + lua_setfield(L, -2, key); +} + + +static void setboolfield (lua_State *L, const char *key, int value) { + if (value < 0) /* undefined? */ + return; /* does not set field */ + lua_pushboolean(L, value); + lua_setfield(L, -2, key); +} + + +/* +** Set all fields from structure 'tm' in the table on top of the stack +*/ +static void setallfields (lua_State *L, struct tm *stm) { + setfield(L, "year", stm->tm_year, 1900); + setfield(L, "month", stm->tm_mon, 1); + setfield(L, "day", stm->tm_mday, 0); + setfield(L, "hour", stm->tm_hour, 0); + setfield(L, "min", stm->tm_min, 0); + setfield(L, "sec", stm->tm_sec, 0); + setfield(L, "yday", stm->tm_yday, 1); + setfield(L, "wday", stm->tm_wday, 1); + setboolfield(L, "isdst", stm->tm_isdst); +} + + +static int getboolfield (lua_State *L, const char *key) { + int res; + res = (lua_getfield(L, -1, key) == LUA_TNIL) ? -1 : lua_toboolean(L, -1); + lua_pop(L, 1); + return res; +} + + +static int getfield (lua_State *L, const char *key, int d, int delta) { + int isnum; + int t = lua_getfield(L, -1, key); /* get field and its type */ + lua_Integer res = lua_tointegerx(L, -1, &isnum); + if (!isnum) { /* field is not an integer? */ + if (l_unlikely(t != LUA_TNIL)) /* some other value? */ + return luaL_error(L, "field '%s' is not an integer", key); + else if (l_unlikely(d < 0)) /* absent field; no default? */ + return luaL_error(L, "field '%s' missing in date table", key); + res = d; + } + else { + if (!(res >= 0 ? res - delta <= INT_MAX : INT_MIN + delta <= res)) + return luaL_error(L, "field '%s' is out-of-bound", key); + res -= delta; + } + lua_pop(L, 1); + return (int)res; +} + + +static const char *checkoption (lua_State *L, const char *conv, + ptrdiff_t convlen, char *buff) { + const char *option = LUA_STRFTIMEOPTIONS; + int oplen = 1; /* length of options being checked */ + for (; *option != '\0' && oplen <= convlen; option += oplen) { + if (*option == '|') /* next block? */ + oplen++; /* will check options with next length (+1) */ + else if (memcmp(conv, option, oplen) == 0) { /* match? */ + memcpy(buff, conv, oplen); /* copy valid option to buffer */ + buff[oplen] = '\0'; + return conv + oplen; /* return next item */ + } + } + luaL_argerror(L, 1, + lua_pushfstring(L, "invalid conversion specifier '%%%s'", conv)); + return conv; /* to avoid warnings */ +} + + +static time_t l_checktime (lua_State *L, int arg) { + l_timet t = l_gettime(L, arg); + luaL_argcheck(L, (time_t)t == t, arg, "time out-of-bounds"); + return (time_t)t; +} + + +/* maximum size for an individual 'strftime' item */ +#define SIZETIMEFMT 250 + + +static int os_date (lua_State *L) { + size_t slen; + const char *s = luaL_optlstring(L, 1, "%c", &slen); + time_t t = luaL_opt(L, l_checktime, 2, time(NULL)); + const char *se = s + slen; /* 's' end */ + struct tm tmr, *stm; + if (*s == '!') { /* UTC? */ + stm = l_gmtime(&t, &tmr); + s++; /* skip '!' */ + } + else + stm = l_localtime(&t, &tmr); + if (stm == NULL) /* invalid date? */ + return luaL_error(L, + "date result cannot be represented in this installation"); + if (strcmp(s, "*t") == 0) { + lua_createtable(L, 0, 9); /* 9 = number of fields */ + setallfields(L, stm); + } + else { + char cc[4]; /* buffer for individual conversion specifiers */ + luaL_Buffer b; + cc[0] = '%'; + luaL_buffinit(L, &b); + while (s < se) { + if (*s != '%') /* not a conversion specifier? */ + luaL_addchar(&b, *s++); + else { + size_t reslen; + char *buff = luaL_prepbuffsize(&b, SIZETIMEFMT); + s++; /* skip '%' */ + s = checkoption(L, s, se - s, cc + 1); /* copy specifier to 'cc' */ + reslen = strftime(buff, SIZETIMEFMT, cc, stm); + luaL_addsize(&b, reslen); + } + } + luaL_pushresult(&b); + } + return 1; +} + + +static int os_time (lua_State *L) { + time_t t; + if (lua_isnoneornil(L, 1)) /* called without args? */ + t = time(NULL); /* get current time */ + else { + struct tm ts; + luaL_checktype(L, 1, LUA_TTABLE); + lua_settop(L, 1); /* make sure table is at the top */ + ts.tm_year = getfield(L, "year", -1, 1900); + ts.tm_mon = getfield(L, "month", -1, 1); + ts.tm_mday = getfield(L, "day", -1, 0); + ts.tm_hour = getfield(L, "hour", 12, 0); + ts.tm_min = getfield(L, "min", 0, 0); + ts.tm_sec = getfield(L, "sec", 0, 0); + ts.tm_isdst = getboolfield(L, "isdst"); + t = mktime(&ts); + setallfields(L, &ts); /* update fields with normalized values */ + } + if (t != (time_t)(l_timet)t || t == (time_t)(-1)) + return luaL_error(L, + "time result cannot be represented in this installation"); + l_pushtime(L, t); + return 1; +} + + +static int os_difftime (lua_State *L) { + time_t t1 = l_checktime(L, 1); + time_t t2 = l_checktime(L, 2); + lua_pushnumber(L, (lua_Number)difftime(t1, t2)); + return 1; +} + +/* }====================================================== */ + + +static int os_setlocale (lua_State *L) { + static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY, + LC_NUMERIC, LC_TIME}; + static const char *const catnames[] = {"all", "collate", "ctype", "monetary", + "numeric", "time", NULL}; + const char *l = luaL_optstring(L, 1, NULL); + int op = luaL_checkoption(L, 2, "all", catnames); + lua_pushstring(L, setlocale(cat[op], l)); + return 1; +} + + +static int os_exit (lua_State *L) { + int status; + if (lua_isboolean(L, 1)) + status = (lua_toboolean(L, 1) ? EXIT_SUCCESS : EXIT_FAILURE); + else + status = (int)luaL_optinteger(L, 1, EXIT_SUCCESS); + if (lua_toboolean(L, 2)) + lua_close(L); + if (L) exit(status); /* 'if' to avoid warnings for unreachable 'return' */ + return 0; +} + + +static const luaL_Reg syslib[] = { + {"clock", os_clock}, + {"date", os_date}, + {"difftime", os_difftime}, + {"execute", os_execute}, + {"exit", os_exit}, + {"getenv", os_getenv}, + {"remove", os_remove}, + {"rename", os_rename}, + {"setlocale", os_setlocale}, + {"time", os_time}, + {"tmpname", os_tmpname}, + {NULL, NULL} +}; + +/* }====================================================== */ + + + +LUAMOD_API int luaopen_os (lua_State *L) { + luaL_newlib(L, syslib); + return 1; +} + diff --git a/06/lua-5.4.6/src/lparser.c b/06/lua-5.4.6/src/lparser.c new file mode 100644 index 0000000..b745f23 --- /dev/null +++ b/06/lua-5.4.6/src/lparser.c @@ -0,0 +1,1967 @@ +/* +** $Id: lparser.c $ +** Lua Parser +** See Copyright Notice in lua.h +*/ + +#define lparser_c +#define LUA_CORE + +#include "lprefix.h" + + +#include +#include + +#include "lua.h" + +#include "lcode.h" +#include "ldebug.h" +#include "ldo.h" +#include "lfunc.h" +#include "llex.h" +#include "lmem.h" +#include "lobject.h" +#include "lopcodes.h" +#include "lparser.h" +#include "lstate.h" +#include "lstring.h" +#include "ltable.h" + + + +/* maximum number of local variables per function (must be smaller + than 250, due to the bytecode format) */ +#define MAXVARS 200 + + +#define hasmultret(k) ((k) == VCALL || (k) == VVARARG) + + +/* because all strings are unified by the scanner, the parser + can use pointer equality for string equality */ +#define eqstr(a,b) ((a) == (b)) + + +/* +** nodes for block list (list of active blocks) +*/ +typedef struct BlockCnt { + struct BlockCnt *previous; /* chain */ + int firstlabel; /* index of first label in this block */ + int firstgoto; /* index of first pending goto in this block */ + lu_byte nactvar; /* # active locals outside the block */ + lu_byte upval; /* true if some variable in the block is an upvalue */ + lu_byte isloop; /* true if 'block' is a loop */ + lu_byte insidetbc; /* true if inside the scope of a to-be-closed var. */ +} BlockCnt; + + + +/* +** prototypes for recursive non-terminal functions +*/ +static void statement (LexState *ls); +static void expr (LexState *ls, expdesc *v); + + +static l_noret error_expected (LexState *ls, int token) { + luaX_syntaxerror(ls, + luaO_pushfstring(ls->L, "%s expected", luaX_token2str(ls, token))); +} + + +static l_noret errorlimit (FuncState *fs, int limit, const char *what) { + lua_State *L = fs->ls->L; + const char *msg; + int line = fs->f->linedefined; + const char *where = (line == 0) + ? "main function" + : luaO_pushfstring(L, "function at line %d", line); + msg = luaO_pushfstring(L, "too many %s (limit is %d) in %s", + what, limit, where); + luaX_syntaxerror(fs->ls, msg); +} + + +static void checklimit (FuncState *fs, int v, int l, const char *what) { + if (v > l) errorlimit(fs, l, what); +} + + +/* +** Test whether next token is 'c'; if so, skip it. +*/ +static int testnext (LexState *ls, int c) { + if (ls->t.token == c) { + luaX_next(ls); + return 1; + } + else return 0; +} + + +/* +** Check that next token is 'c'. +*/ +static void check (LexState *ls, int c) { + if (ls->t.token != c) + error_expected(ls, c); +} + + +/* +** Check that next token is 'c' and skip it. +*/ +static void checknext (LexState *ls, int c) { + check(ls, c); + luaX_next(ls); +} + + +#define check_condition(ls,c,msg) { if (!(c)) luaX_syntaxerror(ls, msg); } + + +/* +** Check that next token is 'what' and skip it. In case of error, +** raise an error that the expected 'what' should match a 'who' +** in line 'where' (if that is not the current line). +*/ +static void check_match (LexState *ls, int what, int who, int where) { + if (l_unlikely(!testnext(ls, what))) { + if (where == ls->linenumber) /* all in the same line? */ + error_expected(ls, what); /* do not need a complex message */ + else { + luaX_syntaxerror(ls, luaO_pushfstring(ls->L, + "%s expected (to close %s at line %d)", + luaX_token2str(ls, what), luaX_token2str(ls, who), where)); + } + } +} + + +static TString *str_checkname (LexState *ls) { + TString *ts; + check(ls, TK_NAME); + ts = ls->t.seminfo.ts; + luaX_next(ls); + return ts; +} + + +static void init_exp (expdesc *e, expkind k, int i) { + e->f = e->t = NO_JUMP; + e->k = k; + e->u.info = i; +} + + +static void codestring (expdesc *e, TString *s) { + e->f = e->t = NO_JUMP; + e->k = VKSTR; + e->u.strval = s; +} + + +static void codename (LexState *ls, expdesc *e) { + codestring(e, str_checkname(ls)); +} + + +/* +** Register a new local variable in the active 'Proto' (for debug +** information). +*/ +static int registerlocalvar (LexState *ls, FuncState *fs, TString *varname) { + Proto *f = fs->f; + int oldsize = f->sizelocvars; + luaM_growvector(ls->L, f->locvars, fs->ndebugvars, f->sizelocvars, + LocVar, SHRT_MAX, "local variables"); + while (oldsize < f->sizelocvars) + f->locvars[oldsize++].varname = NULL; + f->locvars[fs->ndebugvars].varname = varname; + f->locvars[fs->ndebugvars].startpc = fs->pc; + luaC_objbarrier(ls->L, f, varname); + return fs->ndebugvars++; +} + + +/* +** Create a new local variable with the given 'name'. Return its index +** in the function. +*/ +static int new_localvar (LexState *ls, TString *name) { + lua_State *L = ls->L; + FuncState *fs = ls->fs; + Dyndata *dyd = ls->dyd; + Vardesc *var; + checklimit(fs, dyd->actvar.n + 1 - fs->firstlocal, + MAXVARS, "local variables"); + luaM_growvector(L, dyd->actvar.arr, dyd->actvar.n + 1, + dyd->actvar.size, Vardesc, USHRT_MAX, "local variables"); + var = &dyd->actvar.arr[dyd->actvar.n++]; + var->vd.kind = VDKREG; /* default */ + var->vd.name = name; + return dyd->actvar.n - 1 - fs->firstlocal; +} + +#define new_localvarliteral(ls,v) \ + new_localvar(ls, \ + luaX_newstring(ls, "" v, (sizeof(v)/sizeof(char)) - 1)); + + + +/* +** Return the "variable description" (Vardesc) of a given variable. +** (Unless noted otherwise, all variables are referred to by their +** compiler indices.) +*/ +static Vardesc *getlocalvardesc (FuncState *fs, int vidx) { + return &fs->ls->dyd->actvar.arr[fs->firstlocal + vidx]; +} + + +/* +** Convert 'nvar', a compiler index level, to its corresponding +** register. For that, search for the highest variable below that level +** that is in a register and uses its register index ('ridx') plus one. +*/ +static int reglevel (FuncState *fs, int nvar) { + while (nvar-- > 0) { + Vardesc *vd = getlocalvardesc(fs, nvar); /* get previous variable */ + if (vd->vd.kind != RDKCTC) /* is in a register? */ + return vd->vd.ridx + 1; + } + return 0; /* no variables in registers */ +} + + +/* +** Return the number of variables in the register stack for the given +** function. +*/ +int luaY_nvarstack (FuncState *fs) { + return reglevel(fs, fs->nactvar); +} + + +/* +** Get the debug-information entry for current variable 'vidx'. +*/ +static LocVar *localdebuginfo (FuncState *fs, int vidx) { + Vardesc *vd = getlocalvardesc(fs, vidx); + if (vd->vd.kind == RDKCTC) + return NULL; /* no debug info. for constants */ + else { + int idx = vd->vd.pidx; + lua_assert(idx < fs->ndebugvars); + return &fs->f->locvars[idx]; + } +} + + +/* +** Create an expression representing variable 'vidx' +*/ +static void init_var (FuncState *fs, expdesc *e, int vidx) { + e->f = e->t = NO_JUMP; + e->k = VLOCAL; + e->u.var.vidx = vidx; + e->u.var.ridx = getlocalvardesc(fs, vidx)->vd.ridx; +} + + +/* +** Raises an error if variable described by 'e' is read only +*/ +static void check_readonly (LexState *ls, expdesc *e) { + FuncState *fs = ls->fs; + TString *varname = NULL; /* to be set if variable is const */ + switch (e->k) { + case VCONST: { + varname = ls->dyd->actvar.arr[e->u.info].vd.name; + break; + } + case VLOCAL: { + Vardesc *vardesc = getlocalvardesc(fs, e->u.var.vidx); + if (vardesc->vd.kind != VDKREG) /* not a regular variable? */ + varname = vardesc->vd.name; + break; + } + case VUPVAL: { + Upvaldesc *up = &fs->f->upvalues[e->u.info]; + if (up->kind != VDKREG) + varname = up->name; + break; + } + default: + return; /* other cases cannot be read-only */ + } + if (varname) { + const char *msg = luaO_pushfstring(ls->L, + "attempt to assign to const variable '%s'", getstr(varname)); + luaK_semerror(ls, msg); /* error */ + } +} + + +/* +** Start the scope for the last 'nvars' created variables. +*/ +static void adjustlocalvars (LexState *ls, int nvars) { + FuncState *fs = ls->fs; + int reglevel = luaY_nvarstack(fs); + int i; + for (i = 0; i < nvars; i++) { + int vidx = fs->nactvar++; + Vardesc *var = getlocalvardesc(fs, vidx); + var->vd.ridx = reglevel++; + var->vd.pidx = registerlocalvar(ls, fs, var->vd.name); + } +} + + +/* +** Close the scope for all variables up to level 'tolevel'. +** (debug info.) +*/ +static void removevars (FuncState *fs, int tolevel) { + fs->ls->dyd->actvar.n -= (fs->nactvar - tolevel); + while (fs->nactvar > tolevel) { + LocVar *var = localdebuginfo(fs, --fs->nactvar); + if (var) /* does it have debug information? */ + var->endpc = fs->pc; + } +} + + +/* +** Search the upvalues of the function 'fs' for one +** with the given 'name'. +*/ +static int searchupvalue (FuncState *fs, TString *name) { + int i; + Upvaldesc *up = fs->f->upvalues; + for (i = 0; i < fs->nups; i++) { + if (eqstr(up[i].name, name)) return i; + } + return -1; /* not found */ +} + + +static Upvaldesc *allocupvalue (FuncState *fs) { + Proto *f = fs->f; + int oldsize = f->sizeupvalues; + checklimit(fs, fs->nups + 1, MAXUPVAL, "upvalues"); + luaM_growvector(fs->ls->L, f->upvalues, fs->nups, f->sizeupvalues, + Upvaldesc, MAXUPVAL, "upvalues"); + while (oldsize < f->sizeupvalues) + f->upvalues[oldsize++].name = NULL; + return &f->upvalues[fs->nups++]; +} + + +static int newupvalue (FuncState *fs, TString *name, expdesc *v) { + Upvaldesc *up = allocupvalue(fs); + FuncState *prev = fs->prev; + if (v->k == VLOCAL) { + up->instack = 1; + up->idx = v->u.var.ridx; + up->kind = getlocalvardesc(prev, v->u.var.vidx)->vd.kind; + lua_assert(eqstr(name, getlocalvardesc(prev, v->u.var.vidx)->vd.name)); + } + else { + up->instack = 0; + up->idx = cast_byte(v->u.info); + up->kind = prev->f->upvalues[v->u.info].kind; + lua_assert(eqstr(name, prev->f->upvalues[v->u.info].name)); + } + up->name = name; + luaC_objbarrier(fs->ls->L, fs->f, name); + return fs->nups - 1; +} + + +/* +** Look for an active local variable with the name 'n' in the +** function 'fs'. If found, initialize 'var' with it and return +** its expression kind; otherwise return -1. +*/ +static int searchvar (FuncState *fs, TString *n, expdesc *var) { + int i; + for (i = cast_int(fs->nactvar) - 1; i >= 0; i--) { + Vardesc *vd = getlocalvardesc(fs, i); + if (eqstr(n, vd->vd.name)) { /* found? */ + if (vd->vd.kind == RDKCTC) /* compile-time constant? */ + init_exp(var, VCONST, fs->firstlocal + i); + else /* real variable */ + init_var(fs, var, i); + return var->k; + } + } + return -1; /* not found */ +} + + +/* +** Mark block where variable at given level was defined +** (to emit close instructions later). +*/ +static void markupval (FuncState *fs, int level) { + BlockCnt *bl = fs->bl; + while (bl->nactvar > level) + bl = bl->previous; + bl->upval = 1; + fs->needclose = 1; +} + + +/* +** Mark that current block has a to-be-closed variable. +*/ +static void marktobeclosed (FuncState *fs) { + BlockCnt *bl = fs->bl; + bl->upval = 1; + bl->insidetbc = 1; + fs->needclose = 1; +} + + +/* +** Find a variable with the given name 'n'. If it is an upvalue, add +** this upvalue into all intermediate functions. If it is a global, set +** 'var' as 'void' as a flag. +*/ +static void singlevaraux (FuncState *fs, TString *n, expdesc *var, int base) { + if (fs == NULL) /* no more levels? */ + init_exp(var, VVOID, 0); /* default is global */ + else { + int v = searchvar(fs, n, var); /* look up locals at current level */ + if (v >= 0) { /* found? */ + if (v == VLOCAL && !base) + markupval(fs, var->u.var.vidx); /* local will be used as an upval */ + } + else { /* not found as local at current level; try upvalues */ + int idx = searchupvalue(fs, n); /* try existing upvalues */ + if (idx < 0) { /* not found? */ + singlevaraux(fs->prev, n, var, 0); /* try upper levels */ + if (var->k == VLOCAL || var->k == VUPVAL) /* local or upvalue? */ + idx = newupvalue(fs, n, var); /* will be a new upvalue */ + else /* it is a global or a constant */ + return; /* don't need to do anything at this level */ + } + init_exp(var, VUPVAL, idx); /* new or old upvalue */ + } + } +} + + +/* +** Find a variable with the given name 'n', handling global variables +** too. +*/ +static void singlevar (LexState *ls, expdesc *var) { + TString *varname = str_checkname(ls); + FuncState *fs = ls->fs; + singlevaraux(fs, varname, var, 1); + if (var->k == VVOID) { /* global name? */ + expdesc key; + singlevaraux(fs, ls->envn, var, 1); /* get environment variable */ + lua_assert(var->k != VVOID); /* this one must exist */ + luaK_exp2anyregup(fs, var); /* but could be a constant */ + codestring(&key, varname); /* key is variable name */ + luaK_indexed(fs, var, &key); /* env[varname] */ + } +} + + +/* +** Adjust the number of results from an expression list 'e' with 'nexps' +** expressions to 'nvars' values. +*/ +static void adjust_assign (LexState *ls, int nvars, int nexps, expdesc *e) { + FuncState *fs = ls->fs; + int needed = nvars - nexps; /* extra values needed */ + if (hasmultret(e->k)) { /* last expression has multiple returns? */ + int extra = needed + 1; /* discount last expression itself */ + if (extra < 0) + extra = 0; + luaK_setreturns(fs, e, extra); /* last exp. provides the difference */ + } + else { + if (e->k != VVOID) /* at least one expression? */ + luaK_exp2nextreg(fs, e); /* close last expression */ + if (needed > 0) /* missing values? */ + luaK_nil(fs, fs->freereg, needed); /* complete with nils */ + } + if (needed > 0) + luaK_reserveregs(fs, needed); /* registers for extra values */ + else /* adding 'needed' is actually a subtraction */ + fs->freereg += needed; /* remove extra values */ +} + + +#define enterlevel(ls) luaE_incCstack(ls->L) + + +#define leavelevel(ls) ((ls)->L->nCcalls--) + + +/* +** Generates an error that a goto jumps into the scope of some +** local variable. +*/ +static l_noret jumpscopeerror (LexState *ls, Labeldesc *gt) { + const char *varname = getstr(getlocalvardesc(ls->fs, gt->nactvar)->vd.name); + const char *msg = " at line %d jumps into the scope of local '%s'"; + msg = luaO_pushfstring(ls->L, msg, getstr(gt->name), gt->line, varname); + luaK_semerror(ls, msg); /* raise the error */ +} + + +/* +** Solves the goto at index 'g' to given 'label' and removes it +** from the list of pending gotos. +** If it jumps into the scope of some variable, raises an error. +*/ +static void solvegoto (LexState *ls, int g, Labeldesc *label) { + int i; + Labellist *gl = &ls->dyd->gt; /* list of gotos */ + Labeldesc *gt = &gl->arr[g]; /* goto to be resolved */ + lua_assert(eqstr(gt->name, label->name)); + if (l_unlikely(gt->nactvar < label->nactvar)) /* enter some scope? */ + jumpscopeerror(ls, gt); + luaK_patchlist(ls->fs, gt->pc, label->pc); + for (i = g; i < gl->n - 1; i++) /* remove goto from pending list */ + gl->arr[i] = gl->arr[i + 1]; + gl->n--; +} + + +/* +** Search for an active label with the given name. +*/ +static Labeldesc *findlabel (LexState *ls, TString *name) { + int i; + Dyndata *dyd = ls->dyd; + /* check labels in current function for a match */ + for (i = ls->fs->firstlabel; i < dyd->label.n; i++) { + Labeldesc *lb = &dyd->label.arr[i]; + if (eqstr(lb->name, name)) /* correct label? */ + return lb; + } + return NULL; /* label not found */ +} + + +/* +** Adds a new label/goto in the corresponding list. +*/ +static int newlabelentry (LexState *ls, Labellist *l, TString *name, + int line, int pc) { + int n = l->n; + luaM_growvector(ls->L, l->arr, n, l->size, + Labeldesc, SHRT_MAX, "labels/gotos"); + l->arr[n].name = name; + l->arr[n].line = line; + l->arr[n].nactvar = ls->fs->nactvar; + l->arr[n].close = 0; + l->arr[n].pc = pc; + l->n = n + 1; + return n; +} + + +static int newgotoentry (LexState *ls, TString *name, int line, int pc) { + return newlabelentry(ls, &ls->dyd->gt, name, line, pc); +} + + +/* +** Solves forward jumps. Check whether new label 'lb' matches any +** pending gotos in current block and solves them. Return true +** if any of the gotos need to close upvalues. +*/ +static int solvegotos (LexState *ls, Labeldesc *lb) { + Labellist *gl = &ls->dyd->gt; + int i = ls->fs->bl->firstgoto; + int needsclose = 0; + while (i < gl->n) { + if (eqstr(gl->arr[i].name, lb->name)) { + needsclose |= gl->arr[i].close; + solvegoto(ls, i, lb); /* will remove 'i' from the list */ + } + else + i++; + } + return needsclose; +} + + +/* +** Create a new label with the given 'name' at the given 'line'. +** 'last' tells whether label is the last non-op statement in its +** block. Solves all pending gotos to this new label and adds +** a close instruction if necessary. +** Returns true iff it added a close instruction. +*/ +static int createlabel (LexState *ls, TString *name, int line, + int last) { + FuncState *fs = ls->fs; + Labellist *ll = &ls->dyd->label; + int l = newlabelentry(ls, ll, name, line, luaK_getlabel(fs)); + if (last) { /* label is last no-op statement in the block? */ + /* assume that locals are already out of scope */ + ll->arr[l].nactvar = fs->bl->nactvar; + } + if (solvegotos(ls, &ll->arr[l])) { /* need close? */ + luaK_codeABC(fs, OP_CLOSE, luaY_nvarstack(fs), 0, 0); + return 1; + } + return 0; +} + + +/* +** Adjust pending gotos to outer level of a block. +*/ +static void movegotosout (FuncState *fs, BlockCnt *bl) { + int i; + Labellist *gl = &fs->ls->dyd->gt; + /* correct pending gotos to current block */ + for (i = bl->firstgoto; i < gl->n; i++) { /* for each pending goto */ + Labeldesc *gt = &gl->arr[i]; + /* leaving a variable scope? */ + if (reglevel(fs, gt->nactvar) > reglevel(fs, bl->nactvar)) + gt->close |= bl->upval; /* jump may need a close */ + gt->nactvar = bl->nactvar; /* update goto level */ + } +} + + +static void enterblock (FuncState *fs, BlockCnt *bl, lu_byte isloop) { + bl->isloop = isloop; + bl->nactvar = fs->nactvar; + bl->firstlabel = fs->ls->dyd->label.n; + bl->firstgoto = fs->ls->dyd->gt.n; + bl->upval = 0; + bl->insidetbc = (fs->bl != NULL && fs->bl->insidetbc); + bl->previous = fs->bl; + fs->bl = bl; + lua_assert(fs->freereg == luaY_nvarstack(fs)); +} + + +/* +** generates an error for an undefined 'goto'. +*/ +static l_noret undefgoto (LexState *ls, Labeldesc *gt) { + const char *msg; + if (eqstr(gt->name, luaS_newliteral(ls->L, "break"))) { + msg = "break outside loop at line %d"; + msg = luaO_pushfstring(ls->L, msg, gt->line); + } + else { + msg = "no visible label '%s' for at line %d"; + msg = luaO_pushfstring(ls->L, msg, getstr(gt->name), gt->line); + } + luaK_semerror(ls, msg); +} + + +static void leaveblock (FuncState *fs) { + BlockCnt *bl = fs->bl; + LexState *ls = fs->ls; + int hasclose = 0; + int stklevel = reglevel(fs, bl->nactvar); /* level outside the block */ + removevars(fs, bl->nactvar); /* remove block locals */ + lua_assert(bl->nactvar == fs->nactvar); /* back to level on entry */ + if (bl->isloop) /* has to fix pending breaks? */ + hasclose = createlabel(ls, luaS_newliteral(ls->L, "break"), 0, 0); + if (!hasclose && bl->previous && bl->upval) /* still need a 'close'? */ + luaK_codeABC(fs, OP_CLOSE, stklevel, 0, 0); + fs->freereg = stklevel; /* free registers */ + ls->dyd->label.n = bl->firstlabel; /* remove local labels */ + fs->bl = bl->previous; /* current block now is previous one */ + if (bl->previous) /* was it a nested block? */ + movegotosout(fs, bl); /* update pending gotos to enclosing block */ + else { + if (bl->firstgoto < ls->dyd->gt.n) /* still pending gotos? */ + undefgoto(ls, &ls->dyd->gt.arr[bl->firstgoto]); /* error */ + } +} + + +/* +** adds a new prototype into list of prototypes +*/ +static Proto *addprototype (LexState *ls) { + Proto *clp; + lua_State *L = ls->L; + FuncState *fs = ls->fs; + Proto *f = fs->f; /* prototype of current function */ + if (fs->np >= f->sizep) { + int oldsize = f->sizep; + luaM_growvector(L, f->p, fs->np, f->sizep, Proto *, MAXARG_Bx, "functions"); + while (oldsize < f->sizep) + f->p[oldsize++] = NULL; + } + f->p[fs->np++] = clp = luaF_newproto(L); + luaC_objbarrier(L, f, clp); + return clp; +} + + +/* +** codes instruction to create new closure in parent function. +** The OP_CLOSURE instruction uses the last available register, +** so that, if it invokes the GC, the GC knows which registers +** are in use at that time. + +*/ +static void codeclosure (LexState *ls, expdesc *v) { + FuncState *fs = ls->fs->prev; + init_exp(v, VRELOC, luaK_codeABx(fs, OP_CLOSURE, 0, fs->np - 1)); + luaK_exp2nextreg(fs, v); /* fix it at the last register */ +} + + +static void open_func (LexState *ls, FuncState *fs, BlockCnt *bl) { + Proto *f = fs->f; + fs->prev = ls->fs; /* linked list of funcstates */ + fs->ls = ls; + ls->fs = fs; + fs->pc = 0; + fs->previousline = f->linedefined; + fs->iwthabs = 0; + fs->lasttarget = 0; + fs->freereg = 0; + fs->nk = 0; + fs->nabslineinfo = 0; + fs->np = 0; + fs->nups = 0; + fs->ndebugvars = 0; + fs->nactvar = 0; + fs->needclose = 0; + fs->firstlocal = ls->dyd->actvar.n; + fs->firstlabel = ls->dyd->label.n; + fs->bl = NULL; + f->source = ls->source; + luaC_objbarrier(ls->L, f, f->source); + f->maxstacksize = 2; /* registers 0/1 are always valid */ + enterblock(fs, bl, 0); +} + + +static void close_func (LexState *ls) { + lua_State *L = ls->L; + FuncState *fs = ls->fs; + Proto *f = fs->f; + luaK_ret(fs, luaY_nvarstack(fs), 0); /* final return */ + leaveblock(fs); + lua_assert(fs->bl == NULL); + luaK_finish(fs); + luaM_shrinkvector(L, f->code, f->sizecode, fs->pc, Instruction); + luaM_shrinkvector(L, f->lineinfo, f->sizelineinfo, fs->pc, ls_byte); + luaM_shrinkvector(L, f->abslineinfo, f->sizeabslineinfo, + fs->nabslineinfo, AbsLineInfo); + luaM_shrinkvector(L, f->k, f->sizek, fs->nk, TValue); + luaM_shrinkvector(L, f->p, f->sizep, fs->np, Proto *); + luaM_shrinkvector(L, f->locvars, f->sizelocvars, fs->ndebugvars, LocVar); + luaM_shrinkvector(L, f->upvalues, f->sizeupvalues, fs->nups, Upvaldesc); + ls->fs = fs->prev; + luaC_checkGC(L); +} + + + +/*============================================================*/ +/* GRAMMAR RULES */ +/*============================================================*/ + + +/* +** check whether current token is in the follow set of a block. +** 'until' closes syntactical blocks, but do not close scope, +** so it is handled in separate. +*/ +static int block_follow (LexState *ls, int withuntil) { + switch (ls->t.token) { + case TK_ELSE: case TK_ELSEIF: + case TK_END: case TK_EOS: + return 1; + case TK_UNTIL: return withuntil; + default: return 0; + } +} + + +static void statlist (LexState *ls) { + /* statlist -> { stat [';'] } */ + while (!block_follow(ls, 1)) { + if (ls->t.token == TK_RETURN) { + statement(ls); + return; /* 'return' must be last statement */ + } + statement(ls); + } +} + + +static void fieldsel (LexState *ls, expdesc *v) { + /* fieldsel -> ['.' | ':'] NAME */ + FuncState *fs = ls->fs; + expdesc key; + luaK_exp2anyregup(fs, v); + luaX_next(ls); /* skip the dot or colon */ + codename(ls, &key); + luaK_indexed(fs, v, &key); +} + + +static void yindex (LexState *ls, expdesc *v) { + /* index -> '[' expr ']' */ + luaX_next(ls); /* skip the '[' */ + expr(ls, v); + luaK_exp2val(ls->fs, v); + checknext(ls, ']'); +} + + +/* +** {====================================================================== +** Rules for Constructors +** ======================================================================= +*/ + + +typedef struct ConsControl { + expdesc v; /* last list item read */ + expdesc *t; /* table descriptor */ + int nh; /* total number of 'record' elements */ + int na; /* number of array elements already stored */ + int tostore; /* number of array elements pending to be stored */ +} ConsControl; + + +static void recfield (LexState *ls, ConsControl *cc) { + /* recfield -> (NAME | '['exp']') = exp */ + FuncState *fs = ls->fs; + int reg = ls->fs->freereg; + expdesc tab, key, val; + if (ls->t.token == TK_NAME) { + checklimit(fs, cc->nh, MAX_INT, "items in a constructor"); + codename(ls, &key); + } + else /* ls->t.token == '[' */ + yindex(ls, &key); + cc->nh++; + checknext(ls, '='); + tab = *cc->t; + luaK_indexed(fs, &tab, &key); + expr(ls, &val); + luaK_storevar(fs, &tab, &val); + fs->freereg = reg; /* free registers */ +} + + +static void closelistfield (FuncState *fs, ConsControl *cc) { + if (cc->v.k == VVOID) return; /* there is no list item */ + luaK_exp2nextreg(fs, &cc->v); + cc->v.k = VVOID; + if (cc->tostore == LFIELDS_PER_FLUSH) { + luaK_setlist(fs, cc->t->u.info, cc->na, cc->tostore); /* flush */ + cc->na += cc->tostore; + cc->tostore = 0; /* no more items pending */ + } +} + + +static void lastlistfield (FuncState *fs, ConsControl *cc) { + if (cc->tostore == 0) return; + if (hasmultret(cc->v.k)) { + luaK_setmultret(fs, &cc->v); + luaK_setlist(fs, cc->t->u.info, cc->na, LUA_MULTRET); + cc->na--; /* do not count last expression (unknown number of elements) */ + } + else { + if (cc->v.k != VVOID) + luaK_exp2nextreg(fs, &cc->v); + luaK_setlist(fs, cc->t->u.info, cc->na, cc->tostore); + } + cc->na += cc->tostore; +} + + +static void listfield (LexState *ls, ConsControl *cc) { + /* listfield -> exp */ + expr(ls, &cc->v); + cc->tostore++; +} + + +static void field (LexState *ls, ConsControl *cc) { + /* field -> listfield | recfield */ + switch(ls->t.token) { + case TK_NAME: { /* may be 'listfield' or 'recfield' */ + if (luaX_lookahead(ls) != '=') /* expression? */ + listfield(ls, cc); + else + recfield(ls, cc); + break; + } + case '[': { + recfield(ls, cc); + break; + } + default: { + listfield(ls, cc); + break; + } + } +} + + +static void constructor (LexState *ls, expdesc *t) { + /* constructor -> '{' [ field { sep field } [sep] ] '}' + sep -> ',' | ';' */ + FuncState *fs = ls->fs; + int line = ls->linenumber; + int pc = luaK_codeABC(fs, OP_NEWTABLE, 0, 0, 0); + ConsControl cc; + luaK_code(fs, 0); /* space for extra arg. */ + cc.na = cc.nh = cc.tostore = 0; + cc.t = t; + init_exp(t, VNONRELOC, fs->freereg); /* table will be at stack top */ + luaK_reserveregs(fs, 1); + init_exp(&cc.v, VVOID, 0); /* no value (yet) */ + checknext(ls, '{'); + do { + lua_assert(cc.v.k == VVOID || cc.tostore > 0); + if (ls->t.token == '}') break; + closelistfield(fs, &cc); + field(ls, &cc); + } while (testnext(ls, ',') || testnext(ls, ';')); + check_match(ls, '}', '{', line); + lastlistfield(fs, &cc); + luaK_settablesize(fs, pc, t->u.info, cc.na, cc.nh); +} + +/* }====================================================================== */ + + +static void setvararg (FuncState *fs, int nparams) { + fs->f->is_vararg = 1; + luaK_codeABC(fs, OP_VARARGPREP, nparams, 0, 0); +} + + +static void parlist (LexState *ls) { + /* parlist -> [ {NAME ','} (NAME | '...') ] */ + FuncState *fs = ls->fs; + Proto *f = fs->f; + int nparams = 0; + int isvararg = 0; + if (ls->t.token != ')') { /* is 'parlist' not empty? */ + do { + switch (ls->t.token) { + case TK_NAME: { + new_localvar(ls, str_checkname(ls)); + nparams++; + break; + } + case TK_DOTS: { + luaX_next(ls); + isvararg = 1; + break; + } + default: luaX_syntaxerror(ls, " or '...' expected"); + } + } while (!isvararg && testnext(ls, ',')); + } + adjustlocalvars(ls, nparams); + f->numparams = cast_byte(fs->nactvar); + if (isvararg) + setvararg(fs, f->numparams); /* declared vararg */ + luaK_reserveregs(fs, fs->nactvar); /* reserve registers for parameters */ +} + + +static void body (LexState *ls, expdesc *e, int ismethod, int line) { + /* body -> '(' parlist ')' block END */ + FuncState new_fs; + BlockCnt bl; + new_fs.f = addprototype(ls); + new_fs.f->linedefined = line; + open_func(ls, &new_fs, &bl); + checknext(ls, '('); + if (ismethod) { + new_localvarliteral(ls, "self"); /* create 'self' parameter */ + adjustlocalvars(ls, 1); + } + parlist(ls); + checknext(ls, ')'); + statlist(ls); + new_fs.f->lastlinedefined = ls->linenumber; + check_match(ls, TK_END, TK_FUNCTION, line); + codeclosure(ls, e); + close_func(ls); +} + + +static int explist (LexState *ls, expdesc *v) { + /* explist -> expr { ',' expr } */ + int n = 1; /* at least one expression */ + expr(ls, v); + while (testnext(ls, ',')) { + luaK_exp2nextreg(ls->fs, v); + expr(ls, v); + n++; + } + return n; +} + + +static void funcargs (LexState *ls, expdesc *f, int line) { + FuncState *fs = ls->fs; + expdesc args; + int base, nparams; + switch (ls->t.token) { + case '(': { /* funcargs -> '(' [ explist ] ')' */ + luaX_next(ls); + if (ls->t.token == ')') /* arg list is empty? */ + args.k = VVOID; + else { + explist(ls, &args); + if (hasmultret(args.k)) + luaK_setmultret(fs, &args); + } + check_match(ls, ')', '(', line); + break; + } + case '{': { /* funcargs -> constructor */ + constructor(ls, &args); + break; + } + case TK_STRING: { /* funcargs -> STRING */ + codestring(&args, ls->t.seminfo.ts); + luaX_next(ls); /* must use 'seminfo' before 'next' */ + break; + } + default: { + luaX_syntaxerror(ls, "function arguments expected"); + } + } + lua_assert(f->k == VNONRELOC); + base = f->u.info; /* base register for call */ + if (hasmultret(args.k)) + nparams = LUA_MULTRET; /* open call */ + else { + if (args.k != VVOID) + luaK_exp2nextreg(fs, &args); /* close last argument */ + nparams = fs->freereg - (base+1); + } + init_exp(f, VCALL, luaK_codeABC(fs, OP_CALL, base, nparams+1, 2)); + luaK_fixline(fs, line); + fs->freereg = base+1; /* call remove function and arguments and leaves + (unless changed) one result */ +} + + + + +/* +** {====================================================================== +** Expression parsing +** ======================================================================= +*/ + + +static void primaryexp (LexState *ls, expdesc *v) { + /* primaryexp -> NAME | '(' expr ')' */ + switch (ls->t.token) { + case '(': { + int line = ls->linenumber; + luaX_next(ls); + expr(ls, v); + check_match(ls, ')', '(', line); + luaK_dischargevars(ls->fs, v); + return; + } + case TK_NAME: { + singlevar(ls, v); + return; + } + default: { + luaX_syntaxerror(ls, "unexpected symbol"); + } + } +} + + +static void suffixedexp (LexState *ls, expdesc *v) { + /* suffixedexp -> + primaryexp { '.' NAME | '[' exp ']' | ':' NAME funcargs | funcargs } */ + FuncState *fs = ls->fs; + int line = ls->linenumber; + primaryexp(ls, v); + for (;;) { + switch (ls->t.token) { + case '.': { /* fieldsel */ + fieldsel(ls, v); + break; + } + case '[': { /* '[' exp ']' */ + expdesc key; + luaK_exp2anyregup(fs, v); + yindex(ls, &key); + luaK_indexed(fs, v, &key); + break; + } + case ':': { /* ':' NAME funcargs */ + expdesc key; + luaX_next(ls); + codename(ls, &key); + luaK_self(fs, v, &key); + funcargs(ls, v, line); + break; + } + case '(': case TK_STRING: case '{': { /* funcargs */ + luaK_exp2nextreg(fs, v); + funcargs(ls, v, line); + break; + } + default: return; + } + } +} + + +static void simpleexp (LexState *ls, expdesc *v) { + /* simpleexp -> FLT | INT | STRING | NIL | TRUE | FALSE | ... | + constructor | FUNCTION body | suffixedexp */ + switch (ls->t.token) { + case TK_FLT: { + init_exp(v, VKFLT, 0); + v->u.nval = ls->t.seminfo.r; + break; + } + case TK_INT: { + init_exp(v, VKINT, 0); + v->u.ival = ls->t.seminfo.i; + break; + } + case TK_STRING: { + codestring(v, ls->t.seminfo.ts); + break; + } + case TK_NIL: { + init_exp(v, VNIL, 0); + break; + } + case TK_TRUE: { + init_exp(v, VTRUE, 0); + break; + } + case TK_FALSE: { + init_exp(v, VFALSE, 0); + break; + } + case TK_DOTS: { /* vararg */ + FuncState *fs = ls->fs; + check_condition(ls, fs->f->is_vararg, + "cannot use '...' outside a vararg function"); + init_exp(v, VVARARG, luaK_codeABC(fs, OP_VARARG, 0, 0, 1)); + break; + } + case '{': { /* constructor */ + constructor(ls, v); + return; + } + case TK_FUNCTION: { + luaX_next(ls); + body(ls, v, 0, ls->linenumber); + return; + } + default: { + suffixedexp(ls, v); + return; + } + } + luaX_next(ls); +} + + +static UnOpr getunopr (int op) { + switch (op) { + case TK_NOT: return OPR_NOT; + case '-': return OPR_MINUS; + case '~': return OPR_BNOT; + case '#': return OPR_LEN; + default: return OPR_NOUNOPR; + } +} + + +static BinOpr getbinopr (int op) { + switch (op) { + case '+': return OPR_ADD; + case '-': return OPR_SUB; + case '*': return OPR_MUL; + case '%': return OPR_MOD; + case '^': return OPR_POW; + case '/': return OPR_DIV; + case TK_IDIV: return OPR_IDIV; + case '&': return OPR_BAND; + case '|': return OPR_BOR; + case '~': return OPR_BXOR; + case TK_SHL: return OPR_SHL; + case TK_SHR: return OPR_SHR; + case TK_CONCAT: return OPR_CONCAT; + case TK_NE: return OPR_NE; + case TK_EQ: return OPR_EQ; + case '<': return OPR_LT; + case TK_LE: return OPR_LE; + case '>': return OPR_GT; + case TK_GE: return OPR_GE; + case TK_AND: return OPR_AND; + case TK_OR: return OPR_OR; + default: return OPR_NOBINOPR; + } +} + + +/* +** Priority table for binary operators. +*/ +static const struct { + lu_byte left; /* left priority for each binary operator */ + lu_byte right; /* right priority */ +} priority[] = { /* ORDER OPR */ + {10, 10}, {10, 10}, /* '+' '-' */ + {11, 11}, {11, 11}, /* '*' '%' */ + {14, 13}, /* '^' (right associative) */ + {11, 11}, {11, 11}, /* '/' '//' */ + {6, 6}, {4, 4}, {5, 5}, /* '&' '|' '~' */ + {7, 7}, {7, 7}, /* '<<' '>>' */ + {9, 8}, /* '..' (right associative) */ + {3, 3}, {3, 3}, {3, 3}, /* ==, <, <= */ + {3, 3}, {3, 3}, {3, 3}, /* ~=, >, >= */ + {2, 2}, {1, 1} /* and, or */ +}; + +#define UNARY_PRIORITY 12 /* priority for unary operators */ + + +/* +** subexpr -> (simpleexp | unop subexpr) { binop subexpr } +** where 'binop' is any binary operator with a priority higher than 'limit' +*/ +static BinOpr subexpr (LexState *ls, expdesc *v, int limit) { + BinOpr op; + UnOpr uop; + enterlevel(ls); + uop = getunopr(ls->t.token); + if (uop != OPR_NOUNOPR) { /* prefix (unary) operator? */ + int line = ls->linenumber; + luaX_next(ls); /* skip operator */ + subexpr(ls, v, UNARY_PRIORITY); + luaK_prefix(ls->fs, uop, v, line); + } + else simpleexp(ls, v); + /* expand while operators have priorities higher than 'limit' */ + op = getbinopr(ls->t.token); + while (op != OPR_NOBINOPR && priority[op].left > limit) { + expdesc v2; + BinOpr nextop; + int line = ls->linenumber; + luaX_next(ls); /* skip operator */ + luaK_infix(ls->fs, op, v); + /* read sub-expression with higher priority */ + nextop = subexpr(ls, &v2, priority[op].right); + luaK_posfix(ls->fs, op, v, &v2, line); + op = nextop; + } + leavelevel(ls); + return op; /* return first untreated operator */ +} + + +static void expr (LexState *ls, expdesc *v) { + subexpr(ls, v, 0); +} + +/* }==================================================================== */ + + + +/* +** {====================================================================== +** Rules for Statements +** ======================================================================= +*/ + + +static void block (LexState *ls) { + /* block -> statlist */ + FuncState *fs = ls->fs; + BlockCnt bl; + enterblock(fs, &bl, 0); + statlist(ls); + leaveblock(fs); +} + + +/* +** structure to chain all variables in the left-hand side of an +** assignment +*/ +struct LHS_assign { + struct LHS_assign *prev; + expdesc v; /* variable (global, local, upvalue, or indexed) */ +}; + + +/* +** check whether, in an assignment to an upvalue/local variable, the +** upvalue/local variable is begin used in a previous assignment to a +** table. If so, save original upvalue/local value in a safe place and +** use this safe copy in the previous assignment. +*/ +static void check_conflict (LexState *ls, struct LHS_assign *lh, expdesc *v) { + FuncState *fs = ls->fs; + int extra = fs->freereg; /* eventual position to save local variable */ + int conflict = 0; + for (; lh; lh = lh->prev) { /* check all previous assignments */ + if (vkisindexed(lh->v.k)) { /* assignment to table field? */ + if (lh->v.k == VINDEXUP) { /* is table an upvalue? */ + if (v->k == VUPVAL && lh->v.u.ind.t == v->u.info) { + conflict = 1; /* table is the upvalue being assigned now */ + lh->v.k = VINDEXSTR; + lh->v.u.ind.t = extra; /* assignment will use safe copy */ + } + } + else { /* table is a register */ + if (v->k == VLOCAL && lh->v.u.ind.t == v->u.var.ridx) { + conflict = 1; /* table is the local being assigned now */ + lh->v.u.ind.t = extra; /* assignment will use safe copy */ + } + /* is index the local being assigned? */ + if (lh->v.k == VINDEXED && v->k == VLOCAL && + lh->v.u.ind.idx == v->u.var.ridx) { + conflict = 1; + lh->v.u.ind.idx = extra; /* previous assignment will use safe copy */ + } + } + } + } + if (conflict) { + /* copy upvalue/local value to a temporary (in position 'extra') */ + if (v->k == VLOCAL) + luaK_codeABC(fs, OP_MOVE, extra, v->u.var.ridx, 0); + else + luaK_codeABC(fs, OP_GETUPVAL, extra, v->u.info, 0); + luaK_reserveregs(fs, 1); + } +} + +/* +** Parse and compile a multiple assignment. The first "variable" +** (a 'suffixedexp') was already read by the caller. +** +** assignment -> suffixedexp restassign +** restassign -> ',' suffixedexp restassign | '=' explist +*/ +static void restassign (LexState *ls, struct LHS_assign *lh, int nvars) { + expdesc e; + check_condition(ls, vkisvar(lh->v.k), "syntax error"); + check_readonly(ls, &lh->v); + if (testnext(ls, ',')) { /* restassign -> ',' suffixedexp restassign */ + struct LHS_assign nv; + nv.prev = lh; + suffixedexp(ls, &nv.v); + if (!vkisindexed(nv.v.k)) + check_conflict(ls, lh, &nv.v); + enterlevel(ls); /* control recursion depth */ + restassign(ls, &nv, nvars+1); + leavelevel(ls); + } + else { /* restassign -> '=' explist */ + int nexps; + checknext(ls, '='); + nexps = explist(ls, &e); + if (nexps != nvars) + adjust_assign(ls, nvars, nexps, &e); + else { + luaK_setoneret(ls->fs, &e); /* close last expression */ + luaK_storevar(ls->fs, &lh->v, &e); + return; /* avoid default */ + } + } + init_exp(&e, VNONRELOC, ls->fs->freereg-1); /* default assignment */ + luaK_storevar(ls->fs, &lh->v, &e); +} + + +static int cond (LexState *ls) { + /* cond -> exp */ + expdesc v; + expr(ls, &v); /* read condition */ + if (v.k == VNIL) v.k = VFALSE; /* 'falses' are all equal here */ + luaK_goiftrue(ls->fs, &v); + return v.f; +} + + +static void gotostat (LexState *ls) { + FuncState *fs = ls->fs; + int line = ls->linenumber; + TString *name = str_checkname(ls); /* label's name */ + Labeldesc *lb = findlabel(ls, name); + if (lb == NULL) /* no label? */ + /* forward jump; will be resolved when the label is declared */ + newgotoentry(ls, name, line, luaK_jump(fs)); + else { /* found a label */ + /* backward jump; will be resolved here */ + int lblevel = reglevel(fs, lb->nactvar); /* label level */ + if (luaY_nvarstack(fs) > lblevel) /* leaving the scope of a variable? */ + luaK_codeABC(fs, OP_CLOSE, lblevel, 0, 0); + /* create jump and link it to the label */ + luaK_patchlist(fs, luaK_jump(fs), lb->pc); + } +} + + +/* +** Break statement. Semantically equivalent to "goto break". +*/ +static void breakstat (LexState *ls) { + int line = ls->linenumber; + luaX_next(ls); /* skip break */ + newgotoentry(ls, luaS_newliteral(ls->L, "break"), line, luaK_jump(ls->fs)); +} + + +/* +** Check whether there is already a label with the given 'name'. +*/ +static void checkrepeated (LexState *ls, TString *name) { + Labeldesc *lb = findlabel(ls, name); + if (l_unlikely(lb != NULL)) { /* already defined? */ + const char *msg = "label '%s' already defined on line %d"; + msg = luaO_pushfstring(ls->L, msg, getstr(name), lb->line); + luaK_semerror(ls, msg); /* error */ + } +} + + +static void labelstat (LexState *ls, TString *name, int line) { + /* label -> '::' NAME '::' */ + checknext(ls, TK_DBCOLON); /* skip double colon */ + while (ls->t.token == ';' || ls->t.token == TK_DBCOLON) + statement(ls); /* skip other no-op statements */ + checkrepeated(ls, name); /* check for repeated labels */ + createlabel(ls, name, line, block_follow(ls, 0)); +} + + +static void whilestat (LexState *ls, int line) { + /* whilestat -> WHILE cond DO block END */ + FuncState *fs = ls->fs; + int whileinit; + int condexit; + BlockCnt bl; + luaX_next(ls); /* skip WHILE */ + whileinit = luaK_getlabel(fs); + condexit = cond(ls); + enterblock(fs, &bl, 1); + checknext(ls, TK_DO); + block(ls); + luaK_jumpto(fs, whileinit); + check_match(ls, TK_END, TK_WHILE, line); + leaveblock(fs); + luaK_patchtohere(fs, condexit); /* false conditions finish the loop */ +} + + +static void repeatstat (LexState *ls, int line) { + /* repeatstat -> REPEAT block UNTIL cond */ + int condexit; + FuncState *fs = ls->fs; + int repeat_init = luaK_getlabel(fs); + BlockCnt bl1, bl2; + enterblock(fs, &bl1, 1); /* loop block */ + enterblock(fs, &bl2, 0); /* scope block */ + luaX_next(ls); /* skip REPEAT */ + statlist(ls); + check_match(ls, TK_UNTIL, TK_REPEAT, line); + condexit = cond(ls); /* read condition (inside scope block) */ + leaveblock(fs); /* finish scope */ + if (bl2.upval) { /* upvalues? */ + int exit = luaK_jump(fs); /* normal exit must jump over fix */ + luaK_patchtohere(fs, condexit); /* repetition must close upvalues */ + luaK_codeABC(fs, OP_CLOSE, reglevel(fs, bl2.nactvar), 0, 0); + condexit = luaK_jump(fs); /* repeat after closing upvalues */ + luaK_patchtohere(fs, exit); /* normal exit comes to here */ + } + luaK_patchlist(fs, condexit, repeat_init); /* close the loop */ + leaveblock(fs); /* finish loop */ +} + + +/* +** Read an expression and generate code to put its results in next +** stack slot. +** +*/ +static void exp1 (LexState *ls) { + expdesc e; + expr(ls, &e); + luaK_exp2nextreg(ls->fs, &e); + lua_assert(e.k == VNONRELOC); +} + + +/* +** Fix for instruction at position 'pc' to jump to 'dest'. +** (Jump addresses are relative in Lua). 'back' true means +** a back jump. +*/ +static void fixforjump (FuncState *fs, int pc, int dest, int back) { + Instruction *jmp = &fs->f->code[pc]; + int offset = dest - (pc + 1); + if (back) + offset = -offset; + if (l_unlikely(offset > MAXARG_Bx)) + luaX_syntaxerror(fs->ls, "control structure too long"); + SETARG_Bx(*jmp, offset); +} + + +/* +** Generate code for a 'for' loop. +*/ +static void forbody (LexState *ls, int base, int line, int nvars, int isgen) { + /* forbody -> DO block */ + static const OpCode forprep[2] = {OP_FORPREP, OP_TFORPREP}; + static const OpCode forloop[2] = {OP_FORLOOP, OP_TFORLOOP}; + BlockCnt bl; + FuncState *fs = ls->fs; + int prep, endfor; + checknext(ls, TK_DO); + prep = luaK_codeABx(fs, forprep[isgen], base, 0); + enterblock(fs, &bl, 0); /* scope for declared variables */ + adjustlocalvars(ls, nvars); + luaK_reserveregs(fs, nvars); + block(ls); + leaveblock(fs); /* end of scope for declared variables */ + fixforjump(fs, prep, luaK_getlabel(fs), 0); + if (isgen) { /* generic for? */ + luaK_codeABC(fs, OP_TFORCALL, base, 0, nvars); + luaK_fixline(fs, line); + } + endfor = luaK_codeABx(fs, forloop[isgen], base, 0); + fixforjump(fs, endfor, prep + 1, 1); + luaK_fixline(fs, line); +} + + +static void fornum (LexState *ls, TString *varname, int line) { + /* fornum -> NAME = exp,exp[,exp] forbody */ + FuncState *fs = ls->fs; + int base = fs->freereg; + new_localvarliteral(ls, "(for state)"); + new_localvarliteral(ls, "(for state)"); + new_localvarliteral(ls, "(for state)"); + new_localvar(ls, varname); + checknext(ls, '='); + exp1(ls); /* initial value */ + checknext(ls, ','); + exp1(ls); /* limit */ + if (testnext(ls, ',')) + exp1(ls); /* optional step */ + else { /* default step = 1 */ + luaK_int(fs, fs->freereg, 1); + luaK_reserveregs(fs, 1); + } + adjustlocalvars(ls, 3); /* control variables */ + forbody(ls, base, line, 1, 0); +} + + +static void forlist (LexState *ls, TString *indexname) { + /* forlist -> NAME {,NAME} IN explist forbody */ + FuncState *fs = ls->fs; + expdesc e; + int nvars = 5; /* gen, state, control, toclose, 'indexname' */ + int line; + int base = fs->freereg; + /* create control variables */ + new_localvarliteral(ls, "(for state)"); + new_localvarliteral(ls, "(for state)"); + new_localvarliteral(ls, "(for state)"); + new_localvarliteral(ls, "(for state)"); + /* create declared variables */ + new_localvar(ls, indexname); + while (testnext(ls, ',')) { + new_localvar(ls, str_checkname(ls)); + nvars++; + } + checknext(ls, TK_IN); + line = ls->linenumber; + adjust_assign(ls, 4, explist(ls, &e), &e); + adjustlocalvars(ls, 4); /* control variables */ + marktobeclosed(fs); /* last control var. must be closed */ + luaK_checkstack(fs, 3); /* extra space to call generator */ + forbody(ls, base, line, nvars - 4, 1); +} + + +static void forstat (LexState *ls, int line) { + /* forstat -> FOR (fornum | forlist) END */ + FuncState *fs = ls->fs; + TString *varname; + BlockCnt bl; + enterblock(fs, &bl, 1); /* scope for loop and control variables */ + luaX_next(ls); /* skip 'for' */ + varname = str_checkname(ls); /* first variable name */ + switch (ls->t.token) { + case '=': fornum(ls, varname, line); break; + case ',': case TK_IN: forlist(ls, varname); break; + default: luaX_syntaxerror(ls, "'=' or 'in' expected"); + } + check_match(ls, TK_END, TK_FOR, line); + leaveblock(fs); /* loop scope ('break' jumps to this point) */ +} + + +static void test_then_block (LexState *ls, int *escapelist) { + /* test_then_block -> [IF | ELSEIF] cond THEN block */ + BlockCnt bl; + FuncState *fs = ls->fs; + expdesc v; + int jf; /* instruction to skip 'then' code (if condition is false) */ + luaX_next(ls); /* skip IF or ELSEIF */ + expr(ls, &v); /* read condition */ + checknext(ls, TK_THEN); + if (ls->t.token == TK_BREAK) { /* 'if x then break' ? */ + int line = ls->linenumber; + luaK_goiffalse(ls->fs, &v); /* will jump if condition is true */ + luaX_next(ls); /* skip 'break' */ + enterblock(fs, &bl, 0); /* must enter block before 'goto' */ + newgotoentry(ls, luaS_newliteral(ls->L, "break"), line, v.t); + while (testnext(ls, ';')) {} /* skip semicolons */ + if (block_follow(ls, 0)) { /* jump is the entire block? */ + leaveblock(fs); + return; /* and that is it */ + } + else /* must skip over 'then' part if condition is false */ + jf = luaK_jump(fs); + } + else { /* regular case (not a break) */ + luaK_goiftrue(ls->fs, &v); /* skip over block if condition is false */ + enterblock(fs, &bl, 0); + jf = v.f; + } + statlist(ls); /* 'then' part */ + leaveblock(fs); + if (ls->t.token == TK_ELSE || + ls->t.token == TK_ELSEIF) /* followed by 'else'/'elseif'? */ + luaK_concat(fs, escapelist, luaK_jump(fs)); /* must jump over it */ + luaK_patchtohere(fs, jf); +} + + +static void ifstat (LexState *ls, int line) { + /* ifstat -> IF cond THEN block {ELSEIF cond THEN block} [ELSE block] END */ + FuncState *fs = ls->fs; + int escapelist = NO_JUMP; /* exit list for finished parts */ + test_then_block(ls, &escapelist); /* IF cond THEN block */ + while (ls->t.token == TK_ELSEIF) + test_then_block(ls, &escapelist); /* ELSEIF cond THEN block */ + if (testnext(ls, TK_ELSE)) + block(ls); /* 'else' part */ + check_match(ls, TK_END, TK_IF, line); + luaK_patchtohere(fs, escapelist); /* patch escape list to 'if' end */ +} + + +static void localfunc (LexState *ls) { + expdesc b; + FuncState *fs = ls->fs; + int fvar = fs->nactvar; /* function's variable index */ + new_localvar(ls, str_checkname(ls)); /* new local variable */ + adjustlocalvars(ls, 1); /* enter its scope */ + body(ls, &b, 0, ls->linenumber); /* function created in next register */ + /* debug information will only see the variable after this point! */ + localdebuginfo(fs, fvar)->startpc = fs->pc; +} + + +static int getlocalattribute (LexState *ls) { + /* ATTRIB -> ['<' Name '>'] */ + if (testnext(ls, '<')) { + const char *attr = getstr(str_checkname(ls)); + checknext(ls, '>'); + if (strcmp(attr, "const") == 0) + return RDKCONST; /* read-only variable */ + else if (strcmp(attr, "close") == 0) + return RDKTOCLOSE; /* to-be-closed variable */ + else + luaK_semerror(ls, + luaO_pushfstring(ls->L, "unknown attribute '%s'", attr)); + } + return VDKREG; /* regular variable */ +} + + +static void checktoclose (FuncState *fs, int level) { + if (level != -1) { /* is there a to-be-closed variable? */ + marktobeclosed(fs); + luaK_codeABC(fs, OP_TBC, reglevel(fs, level), 0, 0); + } +} + + +static void localstat (LexState *ls) { + /* stat -> LOCAL NAME ATTRIB { ',' NAME ATTRIB } ['=' explist] */ + FuncState *fs = ls->fs; + int toclose = -1; /* index of to-be-closed variable (if any) */ + Vardesc *var; /* last variable */ + int vidx, kind; /* index and kind of last variable */ + int nvars = 0; + int nexps; + expdesc e; + do { + vidx = new_localvar(ls, str_checkname(ls)); + kind = getlocalattribute(ls); + getlocalvardesc(fs, vidx)->vd.kind = kind; + if (kind == RDKTOCLOSE) { /* to-be-closed? */ + if (toclose != -1) /* one already present? */ + luaK_semerror(ls, "multiple to-be-closed variables in local list"); + toclose = fs->nactvar + nvars; + } + nvars++; + } while (testnext(ls, ',')); + if (testnext(ls, '=')) + nexps = explist(ls, &e); + else { + e.k = VVOID; + nexps = 0; + } + var = getlocalvardesc(fs, vidx); /* get last variable */ + if (nvars == nexps && /* no adjustments? */ + var->vd.kind == RDKCONST && /* last variable is const? */ + luaK_exp2const(fs, &e, &var->k)) { /* compile-time constant? */ + var->vd.kind = RDKCTC; /* variable is a compile-time constant */ + adjustlocalvars(ls, nvars - 1); /* exclude last variable */ + fs->nactvar++; /* but count it */ + } + else { + adjust_assign(ls, nvars, nexps, &e); + adjustlocalvars(ls, nvars); + } + checktoclose(fs, toclose); +} + + +static int funcname (LexState *ls, expdesc *v) { + /* funcname -> NAME {fieldsel} [':' NAME] */ + int ismethod = 0; + singlevar(ls, v); + while (ls->t.token == '.') + fieldsel(ls, v); + if (ls->t.token == ':') { + ismethod = 1; + fieldsel(ls, v); + } + return ismethod; +} + + +static void funcstat (LexState *ls, int line) { + /* funcstat -> FUNCTION funcname body */ + int ismethod; + expdesc v, b; + luaX_next(ls); /* skip FUNCTION */ + ismethod = funcname(ls, &v); + body(ls, &b, ismethod, line); + check_readonly(ls, &v); + luaK_storevar(ls->fs, &v, &b); + luaK_fixline(ls->fs, line); /* definition "happens" in the first line */ +} + + +static void exprstat (LexState *ls) { + /* stat -> func | assignment */ + FuncState *fs = ls->fs; + struct LHS_assign v; + suffixedexp(ls, &v.v); + if (ls->t.token == '=' || ls->t.token == ',') { /* stat -> assignment ? */ + v.prev = NULL; + restassign(ls, &v, 1); + } + else { /* stat -> func */ + Instruction *inst; + check_condition(ls, v.v.k == VCALL, "syntax error"); + inst = &getinstruction(fs, &v.v); + SETARG_C(*inst, 1); /* call statement uses no results */ + } +} + + +static void retstat (LexState *ls) { + /* stat -> RETURN [explist] [';'] */ + FuncState *fs = ls->fs; + expdesc e; + int nret; /* number of values being returned */ + int first = luaY_nvarstack(fs); /* first slot to be returned */ + if (block_follow(ls, 1) || ls->t.token == ';') + nret = 0; /* return no values */ + else { + nret = explist(ls, &e); /* optional return values */ + if (hasmultret(e.k)) { + luaK_setmultret(fs, &e); + if (e.k == VCALL && nret == 1 && !fs->bl->insidetbc) { /* tail call? */ + SET_OPCODE(getinstruction(fs,&e), OP_TAILCALL); + lua_assert(GETARG_A(getinstruction(fs,&e)) == luaY_nvarstack(fs)); + } + nret = LUA_MULTRET; /* return all values */ + } + else { + if (nret == 1) /* only one single value? */ + first = luaK_exp2anyreg(fs, &e); /* can use original slot */ + else { /* values must go to the top of the stack */ + luaK_exp2nextreg(fs, &e); + lua_assert(nret == fs->freereg - first); + } + } + } + luaK_ret(fs, first, nret); + testnext(ls, ';'); /* skip optional semicolon */ +} + + +static void statement (LexState *ls) { + int line = ls->linenumber; /* may be needed for error messages */ + enterlevel(ls); + switch (ls->t.token) { + case ';': { /* stat -> ';' (empty statement) */ + luaX_next(ls); /* skip ';' */ + break; + } + case TK_IF: { /* stat -> ifstat */ + ifstat(ls, line); + break; + } + case TK_WHILE: { /* stat -> whilestat */ + whilestat(ls, line); + break; + } + case TK_DO: { /* stat -> DO block END */ + luaX_next(ls); /* skip DO */ + block(ls); + check_match(ls, TK_END, TK_DO, line); + break; + } + case TK_FOR: { /* stat -> forstat */ + forstat(ls, line); + break; + } + case TK_REPEAT: { /* stat -> repeatstat */ + repeatstat(ls, line); + break; + } + case TK_FUNCTION: { /* stat -> funcstat */ + funcstat(ls, line); + break; + } + case TK_LOCAL: { /* stat -> localstat */ + luaX_next(ls); /* skip LOCAL */ + if (testnext(ls, TK_FUNCTION)) /* local function? */ + localfunc(ls); + else + localstat(ls); + break; + } + case TK_DBCOLON: { /* stat -> label */ + luaX_next(ls); /* skip double colon */ + labelstat(ls, str_checkname(ls), line); + break; + } + case TK_RETURN: { /* stat -> retstat */ + luaX_next(ls); /* skip RETURN */ + retstat(ls); + break; + } + case TK_BREAK: { /* stat -> breakstat */ + breakstat(ls); + break; + } + case TK_GOTO: { /* stat -> 'goto' NAME */ + luaX_next(ls); /* skip 'goto' */ + gotostat(ls); + break; + } + default: { /* stat -> func | assignment */ + exprstat(ls); + break; + } + } + lua_assert(ls->fs->f->maxstacksize >= ls->fs->freereg && + ls->fs->freereg >= luaY_nvarstack(ls->fs)); + ls->fs->freereg = luaY_nvarstack(ls->fs); /* free registers */ + leavelevel(ls); +} + +/* }====================================================================== */ + + +/* +** compiles the main function, which is a regular vararg function with an +** upvalue named LUA_ENV +*/ +static void mainfunc (LexState *ls, FuncState *fs) { + BlockCnt bl; + Upvaldesc *env; + open_func(ls, fs, &bl); + setvararg(fs, 0); /* main function is always declared vararg */ + env = allocupvalue(fs); /* ...set environment upvalue */ + env->instack = 1; + env->idx = 0; + env->kind = VDKREG; + env->name = ls->envn; + luaC_objbarrier(ls->L, fs->f, env->name); + luaX_next(ls); /* read first token */ + statlist(ls); /* parse main body */ + check(ls, TK_EOS); + close_func(ls); +} + + +LClosure *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff, + Dyndata *dyd, const char *name, int firstchar) { + LexState lexstate; + FuncState funcstate; + LClosure *cl = luaF_newLclosure(L, 1); /* create main closure */ + setclLvalue2s(L, L->top.p, cl); /* anchor it (to avoid being collected) */ + luaD_inctop(L); + lexstate.h = luaH_new(L); /* create table for scanner */ + sethvalue2s(L, L->top.p, lexstate.h); /* anchor it */ + luaD_inctop(L); + funcstate.f = cl->p = luaF_newproto(L); + luaC_objbarrier(L, cl, cl->p); + funcstate.f->source = luaS_new(L, name); /* create and anchor TString */ + luaC_objbarrier(L, funcstate.f, funcstate.f->source); + lexstate.buff = buff; + lexstate.dyd = dyd; + dyd->actvar.n = dyd->gt.n = dyd->label.n = 0; + luaX_setinput(L, &lexstate, z, funcstate.f->source, firstchar); + mainfunc(&lexstate, &funcstate); + lua_assert(!funcstate.prev && funcstate.nups == 1 && !lexstate.fs); + /* all scopes should be correctly finished */ + lua_assert(dyd->actvar.n == 0 && dyd->gt.n == 0 && dyd->label.n == 0); + L->top.p--; /* remove scanner's table */ + return cl; /* closure is on the stack, too */ +} + diff --git a/06/lua-5.4.6/src/lparser.h b/06/lua-5.4.6/src/lparser.h new file mode 100644 index 0000000..5e4500f --- /dev/null +++ b/06/lua-5.4.6/src/lparser.h @@ -0,0 +1,171 @@ +/* +** $Id: lparser.h $ +** Lua Parser +** See Copyright Notice in lua.h +*/ + +#ifndef lparser_h +#define lparser_h + +#include "llimits.h" +#include "lobject.h" +#include "lzio.h" + + +/* +** Expression and variable descriptor. +** Code generation for variables and expressions can be delayed to allow +** optimizations; An 'expdesc' structure describes a potentially-delayed +** variable/expression. It has a description of its "main" value plus a +** list of conditional jumps that can also produce its value (generated +** by short-circuit operators 'and'/'or'). +*/ + +/* kinds of variables/expressions */ +typedef enum { + VVOID, /* when 'expdesc' describes the last expression of a list, + this kind means an empty list (so, no expression) */ + VNIL, /* constant nil */ + VTRUE, /* constant true */ + VFALSE, /* constant false */ + VK, /* constant in 'k'; info = index of constant in 'k' */ + VKFLT, /* floating constant; nval = numerical float value */ + VKINT, /* integer constant; ival = numerical integer value */ + VKSTR, /* string constant; strval = TString address; + (string is fixed by the lexer) */ + VNONRELOC, /* expression has its value in a fixed register; + info = result register */ + VLOCAL, /* local variable; var.ridx = register index; + var.vidx = relative index in 'actvar.arr' */ + VUPVAL, /* upvalue variable; info = index of upvalue in 'upvalues' */ + VCONST, /* compile-time variable; + info = absolute index in 'actvar.arr' */ + VINDEXED, /* indexed variable; + ind.t = table register; + ind.idx = key's R index */ + VINDEXUP, /* indexed upvalue; + ind.t = table upvalue; + ind.idx = key's K index */ + VINDEXI, /* indexed variable with constant integer; + ind.t = table register; + ind.idx = key's value */ + VINDEXSTR, /* indexed variable with literal string; + ind.t = table register; + ind.idx = key's K index */ + VJMP, /* expression is a test/comparison; + info = pc of corresponding jump instruction */ + VRELOC, /* expression can put result in any register; + info = instruction pc */ + VCALL, /* expression is a function call; info = instruction pc */ + VVARARG /* vararg expression; info = instruction pc */ +} expkind; + + +#define vkisvar(k) (VLOCAL <= (k) && (k) <= VINDEXSTR) +#define vkisindexed(k) (VINDEXED <= (k) && (k) <= VINDEXSTR) + + +typedef struct expdesc { + expkind k; + union { + lua_Integer ival; /* for VKINT */ + lua_Number nval; /* for VKFLT */ + TString *strval; /* for VKSTR */ + int info; /* for generic use */ + struct { /* for indexed variables */ + short idx; /* index (R or "long" K) */ + lu_byte t; /* table (register or upvalue) */ + } ind; + struct { /* for local variables */ + lu_byte ridx; /* register holding the variable */ + unsigned short vidx; /* compiler index (in 'actvar.arr') */ + } var; + } u; + int t; /* patch list of 'exit when true' */ + int f; /* patch list of 'exit when false' */ +} expdesc; + + +/* kinds of variables */ +#define VDKREG 0 /* regular */ +#define RDKCONST 1 /* constant */ +#define RDKTOCLOSE 2 /* to-be-closed */ +#define RDKCTC 3 /* compile-time constant */ + +/* description of an active local variable */ +typedef union Vardesc { + struct { + TValuefields; /* constant value (if it is a compile-time constant) */ + lu_byte kind; + lu_byte ridx; /* register holding the variable */ + short pidx; /* index of the variable in the Proto's 'locvars' array */ + TString *name; /* variable name */ + } vd; + TValue k; /* constant value (if any) */ +} Vardesc; + + + +/* description of pending goto statements and label statements */ +typedef struct Labeldesc { + TString *name; /* label identifier */ + int pc; /* position in code */ + int line; /* line where it appeared */ + lu_byte nactvar; /* number of active variables in that position */ + lu_byte close; /* goto that escapes upvalues */ +} Labeldesc; + + +/* list of labels or gotos */ +typedef struct Labellist { + Labeldesc *arr; /* array */ + int n; /* number of entries in use */ + int size; /* array size */ +} Labellist; + + +/* dynamic structures used by the parser */ +typedef struct Dyndata { + struct { /* list of all active local variables */ + Vardesc *arr; + int n; + int size; + } actvar; + Labellist gt; /* list of pending gotos */ + Labellist label; /* list of active labels */ +} Dyndata; + + +/* control of blocks */ +struct BlockCnt; /* defined in lparser.c */ + + +/* state needed to generate code for a given function */ +typedef struct FuncState { + Proto *f; /* current function header */ + struct FuncState *prev; /* enclosing function */ + struct LexState *ls; /* lexical state */ + struct BlockCnt *bl; /* chain of current blocks */ + int pc; /* next position to code (equivalent to 'ncode') */ + int lasttarget; /* 'label' of last 'jump label' */ + int previousline; /* last line that was saved in 'lineinfo' */ + int nk; /* number of elements in 'k' */ + int np; /* number of elements in 'p' */ + int nabslineinfo; /* number of elements in 'abslineinfo' */ + int firstlocal; /* index of first local var (in Dyndata array) */ + int firstlabel; /* index of first label (in 'dyd->label->arr') */ + short ndebugvars; /* number of elements in 'f->locvars' */ + lu_byte nactvar; /* number of active local variables */ + lu_byte nups; /* number of upvalues */ + lu_byte freereg; /* first free register */ + lu_byte iwthabs; /* instructions issued since last absolute line info */ + lu_byte needclose; /* function needs to close upvalues when returning */ +} FuncState; + + +LUAI_FUNC int luaY_nvarstack (FuncState *fs); +LUAI_FUNC LClosure *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff, + Dyndata *dyd, const char *name, int firstchar); + + +#endif diff --git a/06/lua-5.4.6/src/lprefix.h b/06/lua-5.4.6/src/lprefix.h new file mode 100644 index 0000000..484f2ad --- /dev/null +++ b/06/lua-5.4.6/src/lprefix.h @@ -0,0 +1,45 @@ +/* +** $Id: lprefix.h $ +** Definitions for Lua code that must come before any other header file +** See Copyright Notice in lua.h +*/ + +#ifndef lprefix_h +#define lprefix_h + + +/* +** Allows POSIX/XSI stuff +*/ +#if !defined(LUA_USE_C89) /* { */ + +#if !defined(_XOPEN_SOURCE) +#define _XOPEN_SOURCE 600 +#elif _XOPEN_SOURCE == 0 +#undef _XOPEN_SOURCE /* use -D_XOPEN_SOURCE=0 to undefine it */ +#endif + +/* +** Allows manipulation of large files in gcc and some other compilers +*/ +#if !defined(LUA_32BITS) && !defined(_FILE_OFFSET_BITS) +#define _LARGEFILE_SOURCE 1 +#define _FILE_OFFSET_BITS 64 +#endif + +#endif /* } */ + + +/* +** Windows stuff +*/ +#if defined(_WIN32) /* { */ + +#if !defined(_CRT_SECURE_NO_WARNINGS) +#define _CRT_SECURE_NO_WARNINGS /* avoid warnings about ISO C functions */ +#endif + +#endif /* } */ + +#endif + diff --git a/06/lua-5.4.6/src/lstate.c b/06/lua-5.4.6/src/lstate.c new file mode 100644 index 0000000..1e925e5 --- /dev/null +++ b/06/lua-5.4.6/src/lstate.c @@ -0,0 +1,445 @@ +/* +** $Id: lstate.c $ +** Global State +** See Copyright Notice in lua.h +*/ + +#define lstate_c +#define LUA_CORE + +#include "lprefix.h" + + +#include +#include + +#include "lua.h" + +#include "lapi.h" +#include "ldebug.h" +#include "ldo.h" +#include "lfunc.h" +#include "lgc.h" +#include "llex.h" +#include "lmem.h" +#include "lstate.h" +#include "lstring.h" +#include "ltable.h" +#include "ltm.h" + + + +/* +** thread state + extra space +*/ +typedef struct LX { + lu_byte extra_[LUA_EXTRASPACE]; + lua_State l; +} LX; + + +/* +** Main thread combines a thread state and the global state +*/ +typedef struct LG { + LX l; + global_State g; +} LG; + + + +#define fromstate(L) (cast(LX *, cast(lu_byte *, (L)) - offsetof(LX, l))) + + +/* +** A macro to create a "random" seed when a state is created; +** the seed is used to randomize string hashes. +*/ +#if !defined(luai_makeseed) + +#include + +/* +** Compute an initial seed with some level of randomness. +** Rely on Address Space Layout Randomization (if present) and +** current time. +*/ +#define addbuff(b,p,e) \ + { size_t t = cast_sizet(e); \ + memcpy(b + p, &t, sizeof(t)); p += sizeof(t); } + +static unsigned int luai_makeseed (lua_State *L) { + char buff[3 * sizeof(size_t)]; + unsigned int h = cast_uint(time(NULL)); + int p = 0; + addbuff(buff, p, L); /* heap variable */ + addbuff(buff, p, &h); /* local variable */ + addbuff(buff, p, &lua_newstate); /* public function */ + lua_assert(p == sizeof(buff)); + return luaS_hash(buff, p, h); +} + +#endif + + +/* +** set GCdebt to a new value keeping the value (totalbytes + GCdebt) +** invariant (and avoiding underflows in 'totalbytes') +*/ +void luaE_setdebt (global_State *g, l_mem debt) { + l_mem tb = gettotalbytes(g); + lua_assert(tb > 0); + if (debt < tb - MAX_LMEM) + debt = tb - MAX_LMEM; /* will make 'totalbytes == MAX_LMEM' */ + g->totalbytes = tb - debt; + g->GCdebt = debt; +} + + +LUA_API int lua_setcstacklimit (lua_State *L, unsigned int limit) { + UNUSED(L); UNUSED(limit); + return LUAI_MAXCCALLS; /* warning?? */ +} + + +CallInfo *luaE_extendCI (lua_State *L) { + CallInfo *ci; + lua_assert(L->ci->next == NULL); + ci = luaM_new(L, CallInfo); + lua_assert(L->ci->next == NULL); + L->ci->next = ci; + ci->previous = L->ci; + ci->next = NULL; + ci->u.l.trap = 0; + L->nci++; + return ci; +} + + +/* +** free all CallInfo structures not in use by a thread +*/ +void luaE_freeCI (lua_State *L) { + CallInfo *ci = L->ci; + CallInfo *next = ci->next; + ci->next = NULL; + while ((ci = next) != NULL) { + next = ci->next; + luaM_free(L, ci); + L->nci--; + } +} + + +/* +** free half of the CallInfo structures not in use by a thread, +** keeping the first one. +*/ +void luaE_shrinkCI (lua_State *L) { + CallInfo *ci = L->ci->next; /* first free CallInfo */ + CallInfo *next; + if (ci == NULL) + return; /* no extra elements */ + while ((next = ci->next) != NULL) { /* two extra elements? */ + CallInfo *next2 = next->next; /* next's next */ + ci->next = next2; /* remove next from the list */ + L->nci--; + luaM_free(L, next); /* free next */ + if (next2 == NULL) + break; /* no more elements */ + else { + next2->previous = ci; + ci = next2; /* continue */ + } + } +} + + +/* +** Called when 'getCcalls(L)' larger or equal to LUAI_MAXCCALLS. +** If equal, raises an overflow error. If value is larger than +** LUAI_MAXCCALLS (which means it is handling an overflow) but +** not much larger, does not report an error (to allow overflow +** handling to work). +*/ +void luaE_checkcstack (lua_State *L) { + if (getCcalls(L) == LUAI_MAXCCALLS) + luaG_runerror(L, "C stack overflow"); + else if (getCcalls(L) >= (LUAI_MAXCCALLS / 10 * 11)) + luaD_throw(L, LUA_ERRERR); /* error while handling stack error */ +} + + +LUAI_FUNC void luaE_incCstack (lua_State *L) { + L->nCcalls++; + if (l_unlikely(getCcalls(L) >= LUAI_MAXCCALLS)) + luaE_checkcstack(L); +} + + +static void stack_init (lua_State *L1, lua_State *L) { + int i; CallInfo *ci; + /* initialize stack array */ + L1->stack.p = luaM_newvector(L, BASIC_STACK_SIZE + EXTRA_STACK, StackValue); + L1->tbclist.p = L1->stack.p; + for (i = 0; i < BASIC_STACK_SIZE + EXTRA_STACK; i++) + setnilvalue(s2v(L1->stack.p + i)); /* erase new stack */ + L1->top.p = L1->stack.p; + L1->stack_last.p = L1->stack.p + BASIC_STACK_SIZE; + /* initialize first ci */ + ci = &L1->base_ci; + ci->next = ci->previous = NULL; + ci->callstatus = CIST_C; + ci->func.p = L1->top.p; + ci->u.c.k = NULL; + ci->nresults = 0; + setnilvalue(s2v(L1->top.p)); /* 'function' entry for this 'ci' */ + L1->top.p++; + ci->top.p = L1->top.p + LUA_MINSTACK; + L1->ci = ci; +} + + +static void freestack (lua_State *L) { + if (L->stack.p == NULL) + return; /* stack not completely built yet */ + L->ci = &L->base_ci; /* free the entire 'ci' list */ + luaE_freeCI(L); + lua_assert(L->nci == 0); + luaM_freearray(L, L->stack.p, stacksize(L) + EXTRA_STACK); /* free stack */ +} + + +/* +** Create registry table and its predefined values +*/ +static void init_registry (lua_State *L, global_State *g) { + /* create registry */ + Table *registry = luaH_new(L); + sethvalue(L, &g->l_registry, registry); + luaH_resize(L, registry, LUA_RIDX_LAST, 0); + /* registry[LUA_RIDX_MAINTHREAD] = L */ + setthvalue(L, ®istry->array[LUA_RIDX_MAINTHREAD - 1], L); + /* registry[LUA_RIDX_GLOBALS] = new table (table of globals) */ + sethvalue(L, ®istry->array[LUA_RIDX_GLOBALS - 1], luaH_new(L)); +} + + +/* +** open parts of the state that may cause memory-allocation errors. +*/ +static void f_luaopen (lua_State *L, void *ud) { + global_State *g = G(L); + UNUSED(ud); + stack_init(L, L); /* init stack */ + init_registry(L, g); + luaS_init(L); + luaT_init(L); + luaX_init(L); + g->gcstp = 0; /* allow gc */ + setnilvalue(&g->nilvalue); /* now state is complete */ + luai_userstateopen(L); +} + + +/* +** preinitialize a thread with consistent values without allocating +** any memory (to avoid errors) +*/ +static void preinit_thread (lua_State *L, global_State *g) { + G(L) = g; + L->stack.p = NULL; + L->ci = NULL; + L->nci = 0; + L->twups = L; /* thread has no upvalues */ + L->nCcalls = 0; + L->errorJmp = NULL; + L->hook = NULL; + L->hookmask = 0; + L->basehookcount = 0; + L->allowhook = 1; + resethookcount(L); + L->openupval = NULL; + L->status = LUA_OK; + L->errfunc = 0; + L->oldpc = 0; +} + + +static void close_state (lua_State *L) { + global_State *g = G(L); + if (!completestate(g)) /* closing a partially built state? */ + luaC_freeallobjects(L); /* just collect its objects */ + else { /* closing a fully built state */ + L->ci = &L->base_ci; /* unwind CallInfo list */ + luaD_closeprotected(L, 1, LUA_OK); /* close all upvalues */ + luaC_freeallobjects(L); /* collect all objects */ + luai_userstateclose(L); + } + luaM_freearray(L, G(L)->strt.hash, G(L)->strt.size); + freestack(L); + lua_assert(gettotalbytes(g) == sizeof(LG)); + (*g->frealloc)(g->ud, fromstate(L), sizeof(LG), 0); /* free main block */ +} + + +LUA_API lua_State *lua_newthread (lua_State *L) { + global_State *g = G(L); + GCObject *o; + lua_State *L1; + lua_lock(L); + luaC_checkGC(L); + /* create new thread */ + o = luaC_newobjdt(L, LUA_TTHREAD, sizeof(LX), offsetof(LX, l)); + L1 = gco2th(o); + /* anchor it on L stack */ + setthvalue2s(L, L->top.p, L1); + api_incr_top(L); + preinit_thread(L1, g); + L1->hookmask = L->hookmask; + L1->basehookcount = L->basehookcount; + L1->hook = L->hook; + resethookcount(L1); + /* initialize L1 extra space */ + memcpy(lua_getextraspace(L1), lua_getextraspace(g->mainthread), + LUA_EXTRASPACE); + luai_userstatethread(L, L1); + stack_init(L1, L); /* init stack */ + lua_unlock(L); + return L1; +} + + +void luaE_freethread (lua_State *L, lua_State *L1) { + LX *l = fromstate(L1); + luaF_closeupval(L1, L1->stack.p); /* close all upvalues */ + lua_assert(L1->openupval == NULL); + luai_userstatefree(L, L1); + freestack(L1); + luaM_free(L, l); +} + + +int luaE_resetthread (lua_State *L, int status) { + CallInfo *ci = L->ci = &L->base_ci; /* unwind CallInfo list */ + setnilvalue(s2v(L->stack.p)); /* 'function' entry for basic 'ci' */ + ci->func.p = L->stack.p; + ci->callstatus = CIST_C; + if (status == LUA_YIELD) + status = LUA_OK; + L->status = LUA_OK; /* so it can run __close metamethods */ + status = luaD_closeprotected(L, 1, status); + if (status != LUA_OK) /* errors? */ + luaD_seterrorobj(L, status, L->stack.p + 1); + else + L->top.p = L->stack.p + 1; + ci->top.p = L->top.p + LUA_MINSTACK; + luaD_reallocstack(L, cast_int(ci->top.p - L->stack.p), 0); + return status; +} + + +LUA_API int lua_closethread (lua_State *L, lua_State *from) { + int status; + lua_lock(L); + L->nCcalls = (from) ? getCcalls(from) : 0; + status = luaE_resetthread(L, L->status); + lua_unlock(L); + return status; +} + + +/* +** Deprecated! Use 'lua_closethread' instead. +*/ +LUA_API int lua_resetthread (lua_State *L) { + return lua_closethread(L, NULL); +} + + +LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud) { + int i; + lua_State *L; + global_State *g; + LG *l = cast(LG *, (*f)(ud, NULL, LUA_TTHREAD, sizeof(LG))); + if (l == NULL) return NULL; + L = &l->l.l; + g = &l->g; + L->tt = LUA_VTHREAD; + g->currentwhite = bitmask(WHITE0BIT); + L->marked = luaC_white(g); + preinit_thread(L, g); + g->allgc = obj2gco(L); /* by now, only object is the main thread */ + L->next = NULL; + incnny(L); /* main thread is always non yieldable */ + g->frealloc = f; + g->ud = ud; + g->warnf = NULL; + g->ud_warn = NULL; + g->mainthread = L; + g->seed = luai_makeseed(L); + g->gcstp = GCSTPGC; /* no GC while building state */ + g->strt.size = g->strt.nuse = 0; + g->strt.hash = NULL; + setnilvalue(&g->l_registry); + g->panic = NULL; + g->gcstate = GCSpause; + g->gckind = KGC_INC; + g->gcstopem = 0; + g->gcemergency = 0; + g->finobj = g->tobefnz = g->fixedgc = NULL; + g->firstold1 = g->survival = g->old1 = g->reallyold = NULL; + g->finobjsur = g->finobjold1 = g->finobjrold = NULL; + g->sweepgc = NULL; + g->gray = g->grayagain = NULL; + g->weak = g->ephemeron = g->allweak = NULL; + g->twups = NULL; + g->totalbytes = sizeof(LG); + g->GCdebt = 0; + g->lastatomic = 0; + setivalue(&g->nilvalue, 0); /* to signal that state is not yet built */ + setgcparam(g->gcpause, LUAI_GCPAUSE); + setgcparam(g->gcstepmul, LUAI_GCMUL); + g->gcstepsize = LUAI_GCSTEPSIZE; + setgcparam(g->genmajormul, LUAI_GENMAJORMUL); + g->genminormul = LUAI_GENMINORMUL; + for (i=0; i < LUA_NUMTAGS; i++) g->mt[i] = NULL; + if (luaD_rawrunprotected(L, f_luaopen, NULL) != LUA_OK) { + /* memory allocation error: free partial state */ + close_state(L); + L = NULL; + } + return L; +} + + +LUA_API void lua_close (lua_State *L) { + lua_lock(L); + L = G(L)->mainthread; /* only the main thread can be closed */ + close_state(L); +} + + +void luaE_warning (lua_State *L, const char *msg, int tocont) { + lua_WarnFunction wf = G(L)->warnf; + if (wf != NULL) + wf(G(L)->ud_warn, msg, tocont); +} + + +/* +** Generate a warning from an error message +*/ +void luaE_warnerror (lua_State *L, const char *where) { + TValue *errobj = s2v(L->top.p - 1); /* error object */ + const char *msg = (ttisstring(errobj)) + ? svalue(errobj) + : "error object is not a string"; + /* produce warning "error in %s (%s)" (where, msg) */ + luaE_warning(L, "error in ", 1); + luaE_warning(L, where, 1); + luaE_warning(L, " (", 1); + luaE_warning(L, msg, 1); + luaE_warning(L, ")", 0); +} + diff --git a/06/lua-5.4.6/src/lstate.h b/06/lua-5.4.6/src/lstate.h new file mode 100644 index 0000000..8bf6600 --- /dev/null +++ b/06/lua-5.4.6/src/lstate.h @@ -0,0 +1,409 @@ +/* +** $Id: lstate.h $ +** Global State +** See Copyright Notice in lua.h +*/ + +#ifndef lstate_h +#define lstate_h + +#include "lua.h" + + +/* Some header files included here need this definition */ +typedef struct CallInfo CallInfo; + + +#include "lobject.h" +#include "ltm.h" +#include "lzio.h" + + +/* +** Some notes about garbage-collected objects: All objects in Lua must +** be kept somehow accessible until being freed, so all objects always +** belong to one (and only one) of these lists, using field 'next' of +** the 'CommonHeader' for the link: +** +** 'allgc': all objects not marked for finalization; +** 'finobj': all objects marked for finalization; +** 'tobefnz': all objects ready to be finalized; +** 'fixedgc': all objects that are not to be collected (currently +** only small strings, such as reserved words). +** +** For the generational collector, some of these lists have marks for +** generations. Each mark points to the first element in the list for +** that particular generation; that generation goes until the next mark. +** +** 'allgc' -> 'survival': new objects; +** 'survival' -> 'old': objects that survived one collection; +** 'old1' -> 'reallyold': objects that became old in last collection; +** 'reallyold' -> NULL: objects old for more than one cycle. +** +** 'finobj' -> 'finobjsur': new objects marked for finalization; +** 'finobjsur' -> 'finobjold1': survived """"; +** 'finobjold1' -> 'finobjrold': just old """"; +** 'finobjrold' -> NULL: really old """". +** +** All lists can contain elements older than their main ages, due +** to 'luaC_checkfinalizer' and 'udata2finalize', which move +** objects between the normal lists and the "marked for finalization" +** lists. Moreover, barriers can age young objects in young lists as +** OLD0, which then become OLD1. However, a list never contains +** elements younger than their main ages. +** +** The generational collector also uses a pointer 'firstold1', which +** points to the first OLD1 object in the list. It is used to optimize +** 'markold'. (Potentially OLD1 objects can be anywhere between 'allgc' +** and 'reallyold', but often the list has no OLD1 objects or they are +** after 'old1'.) Note the difference between it and 'old1': +** 'firstold1': no OLD1 objects before this point; there can be all +** ages after it. +** 'old1': no objects younger than OLD1 after this point. +*/ + +/* +** Moreover, there is another set of lists that control gray objects. +** These lists are linked by fields 'gclist'. (All objects that +** can become gray have such a field. The field is not the same +** in all objects, but it always has this name.) Any gray object +** must belong to one of these lists, and all objects in these lists +** must be gray (with two exceptions explained below): +** +** 'gray': regular gray objects, still waiting to be visited. +** 'grayagain': objects that must be revisited at the atomic phase. +** That includes +** - black objects got in a write barrier; +** - all kinds of weak tables during propagation phase; +** - all threads. +** 'weak': tables with weak values to be cleared; +** 'ephemeron': ephemeron tables with white->white entries; +** 'allweak': tables with weak keys and/or weak values to be cleared. +** +** The exceptions to that "gray rule" are: +** - TOUCHED2 objects in generational mode stay in a gray list (because +** they must be visited again at the end of the cycle), but they are +** marked black because assignments to them must activate barriers (to +** move them back to TOUCHED1). +** - Open upvales are kept gray to avoid barriers, but they stay out +** of gray lists. (They don't even have a 'gclist' field.) +*/ + + + +/* +** About 'nCcalls': This count has two parts: the lower 16 bits counts +** the number of recursive invocations in the C stack; the higher +** 16 bits counts the number of non-yieldable calls in the stack. +** (They are together so that we can change and save both with one +** instruction.) +*/ + + +/* true if this thread does not have non-yieldable calls in the stack */ +#define yieldable(L) (((L)->nCcalls & 0xffff0000) == 0) + +/* real number of C calls */ +#define getCcalls(L) ((L)->nCcalls & 0xffff) + + +/* Increment the number of non-yieldable calls */ +#define incnny(L) ((L)->nCcalls += 0x10000) + +/* Decrement the number of non-yieldable calls */ +#define decnny(L) ((L)->nCcalls -= 0x10000) + +/* Non-yieldable call increment */ +#define nyci (0x10000 | 1) + + + + +struct lua_longjmp; /* defined in ldo.c */ + + +/* +** Atomic type (relative to signals) to better ensure that 'lua_sethook' +** is thread safe +*/ +#if !defined(l_signalT) +#include +#define l_signalT sig_atomic_t +#endif + + +/* +** Extra stack space to handle TM calls and some other extras. This +** space is not included in 'stack_last'. It is used only to avoid stack +** checks, either because the element will be promptly popped or because +** there will be a stack check soon after the push. Function frames +** never use this extra space, so it does not need to be kept clean. +*/ +#define EXTRA_STACK 5 + + +#define BASIC_STACK_SIZE (2*LUA_MINSTACK) + +#define stacksize(th) cast_int((th)->stack_last.p - (th)->stack.p) + + +/* kinds of Garbage Collection */ +#define KGC_INC 0 /* incremental gc */ +#define KGC_GEN 1 /* generational gc */ + + +typedef struct stringtable { + TString **hash; + int nuse; /* number of elements */ + int size; +} stringtable; + + +/* +** Information about a call. +** About union 'u': +** - field 'l' is used only for Lua functions; +** - field 'c' is used only for C functions. +** About union 'u2': +** - field 'funcidx' is used only by C functions while doing a +** protected call; +** - field 'nyield' is used only while a function is "doing" an +** yield (from the yield until the next resume); +** - field 'nres' is used only while closing tbc variables when +** returning from a function; +** - field 'transferinfo' is used only during call/returnhooks, +** before the function starts or after it ends. +*/ +struct CallInfo { + StkIdRel func; /* function index in the stack */ + StkIdRel top; /* top for this function */ + struct CallInfo *previous, *next; /* dynamic call link */ + union { + struct { /* only for Lua functions */ + const Instruction *savedpc; + volatile l_signalT trap; + int nextraargs; /* # of extra arguments in vararg functions */ + } l; + struct { /* only for C functions */ + lua_KFunction k; /* continuation in case of yields */ + ptrdiff_t old_errfunc; + lua_KContext ctx; /* context info. in case of yields */ + } c; + } u; + union { + int funcidx; /* called-function index */ + int nyield; /* number of values yielded */ + int nres; /* number of values returned */ + struct { /* info about transferred values (for call/return hooks) */ + unsigned short ftransfer; /* offset of first value transferred */ + unsigned short ntransfer; /* number of values transferred */ + } transferinfo; + } u2; + short nresults; /* expected number of results from this function */ + unsigned short callstatus; +}; + + +/* +** Bits in CallInfo status +*/ +#define CIST_OAH (1<<0) /* original value of 'allowhook' */ +#define CIST_C (1<<1) /* call is running a C function */ +#define CIST_FRESH (1<<2) /* call is on a fresh "luaV_execute" frame */ +#define CIST_HOOKED (1<<3) /* call is running a debug hook */ +#define CIST_YPCALL (1<<4) /* doing a yieldable protected call */ +#define CIST_TAIL (1<<5) /* call was tail called */ +#define CIST_HOOKYIELD (1<<6) /* last hook called yielded */ +#define CIST_FIN (1<<7) /* function "called" a finalizer */ +#define CIST_TRAN (1<<8) /* 'ci' has transfer information */ +#define CIST_CLSRET (1<<9) /* function is closing tbc variables */ +/* Bits 10-12 are used for CIST_RECST (see below) */ +#define CIST_RECST 10 +#if defined(LUA_COMPAT_LT_LE) +#define CIST_LEQ (1<<13) /* using __lt for __le */ +#endif + + +/* +** Field CIST_RECST stores the "recover status", used to keep the error +** status while closing to-be-closed variables in coroutines, so that +** Lua can correctly resume after an yield from a __close method called +** because of an error. (Three bits are enough for error status.) +*/ +#define getcistrecst(ci) (((ci)->callstatus >> CIST_RECST) & 7) +#define setcistrecst(ci,st) \ + check_exp(((st) & 7) == (st), /* status must fit in three bits */ \ + ((ci)->callstatus = ((ci)->callstatus & ~(7 << CIST_RECST)) \ + | ((st) << CIST_RECST))) + + +/* active function is a Lua function */ +#define isLua(ci) (!((ci)->callstatus & CIST_C)) + +/* call is running Lua code (not a hook) */ +#define isLuacode(ci) (!((ci)->callstatus & (CIST_C | CIST_HOOKED))) + +/* assume that CIST_OAH has offset 0 and that 'v' is strictly 0/1 */ +#define setoah(st,v) ((st) = ((st) & ~CIST_OAH) | (v)) +#define getoah(st) ((st) & CIST_OAH) + + +/* +** 'global state', shared by all threads of this state +*/ +typedef struct global_State { + lua_Alloc frealloc; /* function to reallocate memory */ + void *ud; /* auxiliary data to 'frealloc' */ + l_mem totalbytes; /* number of bytes currently allocated - GCdebt */ + l_mem GCdebt; /* bytes allocated not yet compensated by the collector */ + lu_mem GCestimate; /* an estimate of the non-garbage memory in use */ + lu_mem lastatomic; /* see function 'genstep' in file 'lgc.c' */ + stringtable strt; /* hash table for strings */ + TValue l_registry; + TValue nilvalue; /* a nil value */ + unsigned int seed; /* randomized seed for hashes */ + lu_byte currentwhite; + lu_byte gcstate; /* state of garbage collector */ + lu_byte gckind; /* kind of GC running */ + lu_byte gcstopem; /* stops emergency collections */ + lu_byte genminormul; /* control for minor generational collections */ + lu_byte genmajormul; /* control for major generational collections */ + lu_byte gcstp; /* control whether GC is running */ + lu_byte gcemergency; /* true if this is an emergency collection */ + lu_byte gcpause; /* size of pause between successive GCs */ + lu_byte gcstepmul; /* GC "speed" */ + lu_byte gcstepsize; /* (log2 of) GC granularity */ + GCObject *allgc; /* list of all collectable objects */ + GCObject **sweepgc; /* current position of sweep in list */ + GCObject *finobj; /* list of collectable objects with finalizers */ + GCObject *gray; /* list of gray objects */ + GCObject *grayagain; /* list of objects to be traversed atomically */ + GCObject *weak; /* list of tables with weak values */ + GCObject *ephemeron; /* list of ephemeron tables (weak keys) */ + GCObject *allweak; /* list of all-weak tables */ + GCObject *tobefnz; /* list of userdata to be GC */ + GCObject *fixedgc; /* list of objects not to be collected */ + /* fields for generational collector */ + GCObject *survival; /* start of objects that survived one GC cycle */ + GCObject *old1; /* start of old1 objects */ + GCObject *reallyold; /* objects more than one cycle old ("really old") */ + GCObject *firstold1; /* first OLD1 object in the list (if any) */ + GCObject *finobjsur; /* list of survival objects with finalizers */ + GCObject *finobjold1; /* list of old1 objects with finalizers */ + GCObject *finobjrold; /* list of really old objects with finalizers */ + struct lua_State *twups; /* list of threads with open upvalues */ + lua_CFunction panic; /* to be called in unprotected errors */ + struct lua_State *mainthread; + TString *memerrmsg; /* message for memory-allocation errors */ + TString *tmname[TM_N]; /* array with tag-method names */ + struct Table *mt[LUA_NUMTYPES]; /* metatables for basic types */ + TString *strcache[STRCACHE_N][STRCACHE_M]; /* cache for strings in API */ + lua_WarnFunction warnf; /* warning function */ + void *ud_warn; /* auxiliary data to 'warnf' */ +} global_State; + + +/* +** 'per thread' state +*/ +struct lua_State { + CommonHeader; + lu_byte status; + lu_byte allowhook; + unsigned short nci; /* number of items in 'ci' list */ + StkIdRel top; /* first free slot in the stack */ + global_State *l_G; + CallInfo *ci; /* call info for current function */ + StkIdRel stack_last; /* end of stack (last element + 1) */ + StkIdRel stack; /* stack base */ + UpVal *openupval; /* list of open upvalues in this stack */ + StkIdRel tbclist; /* list of to-be-closed variables */ + GCObject *gclist; + struct lua_State *twups; /* list of threads with open upvalues */ + struct lua_longjmp *errorJmp; /* current error recover point */ + CallInfo base_ci; /* CallInfo for first level (C calling Lua) */ + volatile lua_Hook hook; + ptrdiff_t errfunc; /* current error handling function (stack index) */ + l_uint32 nCcalls; /* number of nested (non-yieldable | C) calls */ + int oldpc; /* last pc traced */ + int basehookcount; + int hookcount; + volatile l_signalT hookmask; +}; + + +#define G(L) (L->l_G) + +/* +** 'g->nilvalue' being a nil value flags that the state was completely +** build. +*/ +#define completestate(g) ttisnil(&g->nilvalue) + + +/* +** Union of all collectable objects (only for conversions) +** ISO C99, 6.5.2.3 p.5: +** "if a union contains several structures that share a common initial +** sequence [...], and if the union object currently contains one +** of these structures, it is permitted to inspect the common initial +** part of any of them anywhere that a declaration of the complete type +** of the union is visible." +*/ +union GCUnion { + GCObject gc; /* common header */ + struct TString ts; + struct Udata u; + union Closure cl; + struct Table h; + struct Proto p; + struct lua_State th; /* thread */ + struct UpVal upv; +}; + + +/* +** ISO C99, 6.7.2.1 p.14: +** "A pointer to a union object, suitably converted, points to each of +** its members [...], and vice versa." +*/ +#define cast_u(o) cast(union GCUnion *, (o)) + +/* macros to convert a GCObject into a specific value */ +#define gco2ts(o) \ + check_exp(novariant((o)->tt) == LUA_TSTRING, &((cast_u(o))->ts)) +#define gco2u(o) check_exp((o)->tt == LUA_VUSERDATA, &((cast_u(o))->u)) +#define gco2lcl(o) check_exp((o)->tt == LUA_VLCL, &((cast_u(o))->cl.l)) +#define gco2ccl(o) check_exp((o)->tt == LUA_VCCL, &((cast_u(o))->cl.c)) +#define gco2cl(o) \ + check_exp(novariant((o)->tt) == LUA_TFUNCTION, &((cast_u(o))->cl)) +#define gco2t(o) check_exp((o)->tt == LUA_VTABLE, &((cast_u(o))->h)) +#define gco2p(o) check_exp((o)->tt == LUA_VPROTO, &((cast_u(o))->p)) +#define gco2th(o) check_exp((o)->tt == LUA_VTHREAD, &((cast_u(o))->th)) +#define gco2upv(o) check_exp((o)->tt == LUA_VUPVAL, &((cast_u(o))->upv)) + + +/* +** macro to convert a Lua object into a GCObject +** (The access to 'tt' tries to ensure that 'v' is actually a Lua object.) +*/ +#define obj2gco(v) check_exp((v)->tt >= LUA_TSTRING, &(cast_u(v)->gc)) + + +/* actual number of total bytes allocated */ +#define gettotalbytes(g) cast(lu_mem, (g)->totalbytes + (g)->GCdebt) + +LUAI_FUNC void luaE_setdebt (global_State *g, l_mem debt); +LUAI_FUNC void luaE_freethread (lua_State *L, lua_State *L1); +LUAI_FUNC CallInfo *luaE_extendCI (lua_State *L); +LUAI_FUNC void luaE_freeCI (lua_State *L); +LUAI_FUNC void luaE_shrinkCI (lua_State *L); +LUAI_FUNC void luaE_checkcstack (lua_State *L); +LUAI_FUNC void luaE_incCstack (lua_State *L); +LUAI_FUNC void luaE_warning (lua_State *L, const char *msg, int tocont); +LUAI_FUNC void luaE_warnerror (lua_State *L, const char *where); +LUAI_FUNC int luaE_resetthread (lua_State *L, int status); + + +#endif + diff --git a/06/lua-5.4.6/src/lstring.c b/06/lua-5.4.6/src/lstring.c new file mode 100644 index 0000000..13dcaf4 --- /dev/null +++ b/06/lua-5.4.6/src/lstring.c @@ -0,0 +1,273 @@ +/* +** $Id: lstring.c $ +** String table (keeps all strings handled by Lua) +** See Copyright Notice in lua.h +*/ + +#define lstring_c +#define LUA_CORE + +#include "lprefix.h" + + +#include + +#include "lua.h" + +#include "ldebug.h" +#include "ldo.h" +#include "lmem.h" +#include "lobject.h" +#include "lstate.h" +#include "lstring.h" + + +/* +** Maximum size for string table. +*/ +#define MAXSTRTB cast_int(luaM_limitN(MAX_INT, TString*)) + + +/* +** equality for long strings +*/ +int luaS_eqlngstr (TString *a, TString *b) { + size_t len = a->u.lnglen; + lua_assert(a->tt == LUA_VLNGSTR && b->tt == LUA_VLNGSTR); + return (a == b) || /* same instance or... */ + ((len == b->u.lnglen) && /* equal length and ... */ + (memcmp(getstr(a), getstr(b), len) == 0)); /* equal contents */ +} + + +unsigned int luaS_hash (const char *str, size_t l, unsigned int seed) { + unsigned int h = seed ^ cast_uint(l); + for (; l > 0; l--) + h ^= ((h<<5) + (h>>2) + cast_byte(str[l - 1])); + return h; +} + + +unsigned int luaS_hashlongstr (TString *ts) { + lua_assert(ts->tt == LUA_VLNGSTR); + if (ts->extra == 0) { /* no hash? */ + size_t len = ts->u.lnglen; + ts->hash = luaS_hash(getstr(ts), len, ts->hash); + ts->extra = 1; /* now it has its hash */ + } + return ts->hash; +} + + +static void tablerehash (TString **vect, int osize, int nsize) { + int i; + for (i = osize; i < nsize; i++) /* clear new elements */ + vect[i] = NULL; + for (i = 0; i < osize; i++) { /* rehash old part of the array */ + TString *p = vect[i]; + vect[i] = NULL; + while (p) { /* for each string in the list */ + TString *hnext = p->u.hnext; /* save next */ + unsigned int h = lmod(p->hash, nsize); /* new position */ + p->u.hnext = vect[h]; /* chain it into array */ + vect[h] = p; + p = hnext; + } + } +} + + +/* +** Resize the string table. If allocation fails, keep the current size. +** (This can degrade performance, but any non-zero size should work +** correctly.) +*/ +void luaS_resize (lua_State *L, int nsize) { + stringtable *tb = &G(L)->strt; + int osize = tb->size; + TString **newvect; + if (nsize < osize) /* shrinking table? */ + tablerehash(tb->hash, osize, nsize); /* depopulate shrinking part */ + newvect = luaM_reallocvector(L, tb->hash, osize, nsize, TString*); + if (l_unlikely(newvect == NULL)) { /* reallocation failed? */ + if (nsize < osize) /* was it shrinking table? */ + tablerehash(tb->hash, nsize, osize); /* restore to original size */ + /* leave table as it was */ + } + else { /* allocation succeeded */ + tb->hash = newvect; + tb->size = nsize; + if (nsize > osize) + tablerehash(newvect, osize, nsize); /* rehash for new size */ + } +} + + +/* +** Clear API string cache. (Entries cannot be empty, so fill them with +** a non-collectable string.) +*/ +void luaS_clearcache (global_State *g) { + int i, j; + for (i = 0; i < STRCACHE_N; i++) + for (j = 0; j < STRCACHE_M; j++) { + if (iswhite(g->strcache[i][j])) /* will entry be collected? */ + g->strcache[i][j] = g->memerrmsg; /* replace it with something fixed */ + } +} + + +/* +** Initialize the string table and the string cache +*/ +void luaS_init (lua_State *L) { + global_State *g = G(L); + int i, j; + stringtable *tb = &G(L)->strt; + tb->hash = luaM_newvector(L, MINSTRTABSIZE, TString*); + tablerehash(tb->hash, 0, MINSTRTABSIZE); /* clear array */ + tb->size = MINSTRTABSIZE; + /* pre-create memory-error message */ + g->memerrmsg = luaS_newliteral(L, MEMERRMSG); + luaC_fix(L, obj2gco(g->memerrmsg)); /* it should never be collected */ + for (i = 0; i < STRCACHE_N; i++) /* fill cache with valid strings */ + for (j = 0; j < STRCACHE_M; j++) + g->strcache[i][j] = g->memerrmsg; +} + + + +/* +** creates a new string object +*/ +static TString *createstrobj (lua_State *L, size_t l, int tag, unsigned int h) { + TString *ts; + GCObject *o; + size_t totalsize; /* total size of TString object */ + totalsize = sizelstring(l); + o = luaC_newobj(L, tag, totalsize); + ts = gco2ts(o); + ts->hash = h; + ts->extra = 0; + getstr(ts)[l] = '\0'; /* ending 0 */ + return ts; +} + + +TString *luaS_createlngstrobj (lua_State *L, size_t l) { + TString *ts = createstrobj(L, l, LUA_VLNGSTR, G(L)->seed); + ts->u.lnglen = l; + return ts; +} + + +void luaS_remove (lua_State *L, TString *ts) { + stringtable *tb = &G(L)->strt; + TString **p = &tb->hash[lmod(ts->hash, tb->size)]; + while (*p != ts) /* find previous element */ + p = &(*p)->u.hnext; + *p = (*p)->u.hnext; /* remove element from its list */ + tb->nuse--; +} + + +static void growstrtab (lua_State *L, stringtable *tb) { + if (l_unlikely(tb->nuse == MAX_INT)) { /* too many strings? */ + luaC_fullgc(L, 1); /* try to free some... */ + if (tb->nuse == MAX_INT) /* still too many? */ + luaM_error(L); /* cannot even create a message... */ + } + if (tb->size <= MAXSTRTB / 2) /* can grow string table? */ + luaS_resize(L, tb->size * 2); +} + + +/* +** Checks whether short string exists and reuses it or creates a new one. +*/ +static TString *internshrstr (lua_State *L, const char *str, size_t l) { + TString *ts; + global_State *g = G(L); + stringtable *tb = &g->strt; + unsigned int h = luaS_hash(str, l, g->seed); + TString **list = &tb->hash[lmod(h, tb->size)]; + lua_assert(str != NULL); /* otherwise 'memcmp'/'memcpy' are undefined */ + for (ts = *list; ts != NULL; ts = ts->u.hnext) { + if (l == ts->shrlen && (memcmp(str, getstr(ts), l * sizeof(char)) == 0)) { + /* found! */ + if (isdead(g, ts)) /* dead (but not collected yet)? */ + changewhite(ts); /* resurrect it */ + return ts; + } + } + /* else must create a new string */ + if (tb->nuse >= tb->size) { /* need to grow string table? */ + growstrtab(L, tb); + list = &tb->hash[lmod(h, tb->size)]; /* rehash with new size */ + } + ts = createstrobj(L, l, LUA_VSHRSTR, h); + memcpy(getstr(ts), str, l * sizeof(char)); + ts->shrlen = cast_byte(l); + ts->u.hnext = *list; + *list = ts; + tb->nuse++; + return ts; +} + + +/* +** new string (with explicit length) +*/ +TString *luaS_newlstr (lua_State *L, const char *str, size_t l) { + if (l <= LUAI_MAXSHORTLEN) /* short string? */ + return internshrstr(L, str, l); + else { + TString *ts; + if (l_unlikely(l >= (MAX_SIZE - sizeof(TString))/sizeof(char))) + luaM_toobig(L); + ts = luaS_createlngstrobj(L, l); + memcpy(getstr(ts), str, l * sizeof(char)); + return ts; + } +} + + +/* +** Create or reuse a zero-terminated string, first checking in the +** cache (using the string address as a key). The cache can contain +** only zero-terminated strings, so it is safe to use 'strcmp' to +** check hits. +*/ +TString *luaS_new (lua_State *L, const char *str) { + unsigned int i = point2uint(str) % STRCACHE_N; /* hash */ + int j; + TString **p = G(L)->strcache[i]; + for (j = 0; j < STRCACHE_M; j++) { + if (strcmp(str, getstr(p[j])) == 0) /* hit? */ + return p[j]; /* that is it */ + } + /* normal route */ + for (j = STRCACHE_M - 1; j > 0; j--) + p[j] = p[j - 1]; /* move out last element */ + /* new element is first in the list */ + p[0] = luaS_newlstr(L, str, strlen(str)); + return p[0]; +} + + +Udata *luaS_newudata (lua_State *L, size_t s, int nuvalue) { + Udata *u; + int i; + GCObject *o; + if (l_unlikely(s > MAX_SIZE - udatamemoffset(nuvalue))) + luaM_toobig(L); + o = luaC_newobj(L, LUA_VUSERDATA, sizeudata(nuvalue, s)); + u = gco2u(o); + u->len = s; + u->nuvalue = nuvalue; + u->metatable = NULL; + for (i = 0; i < nuvalue; i++) + setnilvalue(&u->uv[i].uv); + return u; +} + diff --git a/06/lua-5.4.6/src/lstring.h b/06/lua-5.4.6/src/lstring.h new file mode 100644 index 0000000..450c239 --- /dev/null +++ b/06/lua-5.4.6/src/lstring.h @@ -0,0 +1,57 @@ +/* +** $Id: lstring.h $ +** String table (keep all strings handled by Lua) +** See Copyright Notice in lua.h +*/ + +#ifndef lstring_h +#define lstring_h + +#include "lgc.h" +#include "lobject.h" +#include "lstate.h" + + +/* +** Memory-allocation error message must be preallocated (it cannot +** be created after memory is exhausted) +*/ +#define MEMERRMSG "not enough memory" + + +/* +** Size of a TString: Size of the header plus space for the string +** itself (including final '\0'). +*/ +#define sizelstring(l) (offsetof(TString, contents) + ((l) + 1) * sizeof(char)) + +#define luaS_newliteral(L, s) (luaS_newlstr(L, "" s, \ + (sizeof(s)/sizeof(char))-1)) + + +/* +** test whether a string is a reserved word +*/ +#define isreserved(s) ((s)->tt == LUA_VSHRSTR && (s)->extra > 0) + + +/* +** equality for short strings, which are always internalized +*/ +#define eqshrstr(a,b) check_exp((a)->tt == LUA_VSHRSTR, (a) == (b)) + + +LUAI_FUNC unsigned int luaS_hash (const char *str, size_t l, unsigned int seed); +LUAI_FUNC unsigned int luaS_hashlongstr (TString *ts); +LUAI_FUNC int luaS_eqlngstr (TString *a, TString *b); +LUAI_FUNC void luaS_resize (lua_State *L, int newsize); +LUAI_FUNC void luaS_clearcache (global_State *g); +LUAI_FUNC void luaS_init (lua_State *L); +LUAI_FUNC void luaS_remove (lua_State *L, TString *ts); +LUAI_FUNC Udata *luaS_newudata (lua_State *L, size_t s, int nuvalue); +LUAI_FUNC TString *luaS_newlstr (lua_State *L, const char *str, size_t l); +LUAI_FUNC TString *luaS_new (lua_State *L, const char *str); +LUAI_FUNC TString *luaS_createlngstrobj (lua_State *L, size_t l); + + +#endif diff --git a/06/lua-5.4.6/src/lstrlib.c b/06/lua-5.4.6/src/lstrlib.c new file mode 100644 index 0000000..0316716 --- /dev/null +++ b/06/lua-5.4.6/src/lstrlib.c @@ -0,0 +1,1874 @@ +/* +** $Id: lstrlib.c $ +** Standard library for string operations and pattern-matching +** See Copyright Notice in lua.h +*/ + +#define lstrlib_c +#define LUA_LIB + +#include "lprefix.h" + + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "lua.h" + +#include "lauxlib.h" +#include "lualib.h" + + +/* +** maximum number of captures that a pattern can do during +** pattern-matching. This limit is arbitrary, but must fit in +** an unsigned char. +*/ +#if !defined(LUA_MAXCAPTURES) +#define LUA_MAXCAPTURES 32 +#endif + + +/* macro to 'unsign' a character */ +#define uchar(c) ((unsigned char)(c)) + + +/* +** Some sizes are better limited to fit in 'int', but must also fit in +** 'size_t'. (We assume that 'lua_Integer' cannot be smaller than 'int'.) +*/ +#define MAX_SIZET ((size_t)(~(size_t)0)) + +#define MAXSIZE \ + (sizeof(size_t) < sizeof(int) ? MAX_SIZET : (size_t)(INT_MAX)) + + + + +static int str_len (lua_State *L) { + size_t l; + luaL_checklstring(L, 1, &l); + lua_pushinteger(L, (lua_Integer)l); + return 1; +} + + +/* +** translate a relative initial string position +** (negative means back from end): clip result to [1, inf). +** The length of any string in Lua must fit in a lua_Integer, +** so there are no overflows in the casts. +** The inverted comparison avoids a possible overflow +** computing '-pos'. +*/ +static size_t posrelatI (lua_Integer pos, size_t len) { + if (pos > 0) + return (size_t)pos; + else if (pos == 0) + return 1; + else if (pos < -(lua_Integer)len) /* inverted comparison */ + return 1; /* clip to 1 */ + else return len + (size_t)pos + 1; +} + + +/* +** Gets an optional ending string position from argument 'arg', +** with default value 'def'. +** Negative means back from end: clip result to [0, len] +*/ +static size_t getendpos (lua_State *L, int arg, lua_Integer def, + size_t len) { + lua_Integer pos = luaL_optinteger(L, arg, def); + if (pos > (lua_Integer)len) + return len; + else if (pos >= 0) + return (size_t)pos; + else if (pos < -(lua_Integer)len) + return 0; + else return len + (size_t)pos + 1; +} + + +static int str_sub (lua_State *L) { + size_t l; + const char *s = luaL_checklstring(L, 1, &l); + size_t start = posrelatI(luaL_checkinteger(L, 2), l); + size_t end = getendpos(L, 3, -1, l); + if (start <= end) + lua_pushlstring(L, s + start - 1, (end - start) + 1); + else lua_pushliteral(L, ""); + return 1; +} + + +static int str_reverse (lua_State *L) { + size_t l, i; + luaL_Buffer b; + const char *s = luaL_checklstring(L, 1, &l); + char *p = luaL_buffinitsize(L, &b, l); + for (i = 0; i < l; i++) + p[i] = s[l - i - 1]; + luaL_pushresultsize(&b, l); + return 1; +} + + +static int str_lower (lua_State *L) { + size_t l; + size_t i; + luaL_Buffer b; + const char *s = luaL_checklstring(L, 1, &l); + char *p = luaL_buffinitsize(L, &b, l); + for (i=0; i MAXSIZE / n)) + return luaL_error(L, "resulting string too large"); + else { + size_t totallen = (size_t)n * l + (size_t)(n - 1) * lsep; + luaL_Buffer b; + char *p = luaL_buffinitsize(L, &b, totallen); + while (n-- > 1) { /* first n-1 copies (followed by separator) */ + memcpy(p, s, l * sizeof(char)); p += l; + if (lsep > 0) { /* empty 'memcpy' is not that cheap */ + memcpy(p, sep, lsep * sizeof(char)); + p += lsep; + } + } + memcpy(p, s, l * sizeof(char)); /* last copy (not followed by separator) */ + luaL_pushresultsize(&b, totallen); + } + return 1; +} + + +static int str_byte (lua_State *L) { + size_t l; + const char *s = luaL_checklstring(L, 1, &l); + lua_Integer pi = luaL_optinteger(L, 2, 1); + size_t posi = posrelatI(pi, l); + size_t pose = getendpos(L, 3, pi, l); + int n, i; + if (posi > pose) return 0; /* empty interval; return no values */ + if (l_unlikely(pose - posi >= (size_t)INT_MAX)) /* arithmetic overflow? */ + return luaL_error(L, "string slice too long"); + n = (int)(pose - posi) + 1; + luaL_checkstack(L, n, "string slice too long"); + for (i=0; iinit) { + state->init = 1; + luaL_buffinit(L, &state->B); + } + luaL_addlstring(&state->B, (const char *)b, size); + return 0; +} + + +static int str_dump (lua_State *L) { + struct str_Writer state; + int strip = lua_toboolean(L, 2); + luaL_checktype(L, 1, LUA_TFUNCTION); + lua_settop(L, 1); /* ensure function is on the top of the stack */ + state.init = 0; + if (l_unlikely(lua_dump(L, writer, &state, strip) != 0)) + return luaL_error(L, "unable to dump given function"); + luaL_pushresult(&state.B); + return 1; +} + + + +/* +** {====================================================== +** METAMETHODS +** ======================================================= +*/ + +#if defined(LUA_NOCVTS2N) /* { */ + +/* no coercion from strings to numbers */ + +static const luaL_Reg stringmetamethods[] = { + {"__index", NULL}, /* placeholder */ + {NULL, NULL} +}; + +#else /* }{ */ + +static int tonum (lua_State *L, int arg) { + if (lua_type(L, arg) == LUA_TNUMBER) { /* already a number? */ + lua_pushvalue(L, arg); + return 1; + } + else { /* check whether it is a numerical string */ + size_t len; + const char *s = lua_tolstring(L, arg, &len); + return (s != NULL && lua_stringtonumber(L, s) == len + 1); + } +} + + +static void trymt (lua_State *L, const char *mtname) { + lua_settop(L, 2); /* back to the original arguments */ + if (l_unlikely(lua_type(L, 2) == LUA_TSTRING || + !luaL_getmetafield(L, 2, mtname))) + luaL_error(L, "attempt to %s a '%s' with a '%s'", mtname + 2, + luaL_typename(L, -2), luaL_typename(L, -1)); + lua_insert(L, -3); /* put metamethod before arguments */ + lua_call(L, 2, 1); /* call metamethod */ +} + + +static int arith (lua_State *L, int op, const char *mtname) { + if (tonum(L, 1) && tonum(L, 2)) + lua_arith(L, op); /* result will be on the top */ + else + trymt(L, mtname); + return 1; +} + + +static int arith_add (lua_State *L) { + return arith(L, LUA_OPADD, "__add"); +} + +static int arith_sub (lua_State *L) { + return arith(L, LUA_OPSUB, "__sub"); +} + +static int arith_mul (lua_State *L) { + return arith(L, LUA_OPMUL, "__mul"); +} + +static int arith_mod (lua_State *L) { + return arith(L, LUA_OPMOD, "__mod"); +} + +static int arith_pow (lua_State *L) { + return arith(L, LUA_OPPOW, "__pow"); +} + +static int arith_div (lua_State *L) { + return arith(L, LUA_OPDIV, "__div"); +} + +static int arith_idiv (lua_State *L) { + return arith(L, LUA_OPIDIV, "__idiv"); +} + +static int arith_unm (lua_State *L) { + return arith(L, LUA_OPUNM, "__unm"); +} + + +static const luaL_Reg stringmetamethods[] = { + {"__add", arith_add}, + {"__sub", arith_sub}, + {"__mul", arith_mul}, + {"__mod", arith_mod}, + {"__pow", arith_pow}, + {"__div", arith_div}, + {"__idiv", arith_idiv}, + {"__unm", arith_unm}, + {"__index", NULL}, /* placeholder */ + {NULL, NULL} +}; + +#endif /* } */ + +/* }====================================================== */ + +/* +** {====================================================== +** PATTERN MATCHING +** ======================================================= +*/ + + +#define CAP_UNFINISHED (-1) +#define CAP_POSITION (-2) + + +typedef struct MatchState { + const char *src_init; /* init of source string */ + const char *src_end; /* end ('\0') of source string */ + const char *p_end; /* end ('\0') of pattern */ + lua_State *L; + int matchdepth; /* control for recursive depth (to avoid C stack overflow) */ + unsigned char level; /* total number of captures (finished or unfinished) */ + struct { + const char *init; + ptrdiff_t len; + } capture[LUA_MAXCAPTURES]; +} MatchState; + + +/* recursive function */ +static const char *match (MatchState *ms, const char *s, const char *p); + + +/* maximum recursion depth for 'match' */ +#if !defined(MAXCCALLS) +#define MAXCCALLS 200 +#endif + + +#define L_ESC '%' +#define SPECIALS "^$*+?.([%-" + + +static int check_capture (MatchState *ms, int l) { + l -= '1'; + if (l_unlikely(l < 0 || l >= ms->level || + ms->capture[l].len == CAP_UNFINISHED)) + return luaL_error(ms->L, "invalid capture index %%%d", l + 1); + return l; +} + + +static int capture_to_close (MatchState *ms) { + int level = ms->level; + for (level--; level>=0; level--) + if (ms->capture[level].len == CAP_UNFINISHED) return level; + return luaL_error(ms->L, "invalid pattern capture"); +} + + +static const char *classend (MatchState *ms, const char *p) { + switch (*p++) { + case L_ESC: { + if (l_unlikely(p == ms->p_end)) + luaL_error(ms->L, "malformed pattern (ends with '%%')"); + return p+1; + } + case '[': { + if (*p == '^') p++; + do { /* look for a ']' */ + if (l_unlikely(p == ms->p_end)) + luaL_error(ms->L, "malformed pattern (missing ']')"); + if (*(p++) == L_ESC && p < ms->p_end) + p++; /* skip escapes (e.g. '%]') */ + } while (*p != ']'); + return p+1; + } + default: { + return p; + } + } +} + + +static int match_class (int c, int cl) { + int res; + switch (tolower(cl)) { + case 'a' : res = isalpha(c); break; + case 'c' : res = iscntrl(c); break; + case 'd' : res = isdigit(c); break; + case 'g' : res = isgraph(c); break; + case 'l' : res = islower(c); break; + case 'p' : res = ispunct(c); break; + case 's' : res = isspace(c); break; + case 'u' : res = isupper(c); break; + case 'w' : res = isalnum(c); break; + case 'x' : res = isxdigit(c); break; + case 'z' : res = (c == 0); break; /* deprecated option */ + default: return (cl == c); + } + return (islower(cl) ? res : !res); +} + + +static int matchbracketclass (int c, const char *p, const char *ec) { + int sig = 1; + if (*(p+1) == '^') { + sig = 0; + p++; /* skip the '^' */ + } + while (++p < ec) { + if (*p == L_ESC) { + p++; + if (match_class(c, uchar(*p))) + return sig; + } + else if ((*(p+1) == '-') && (p+2 < ec)) { + p+=2; + if (uchar(*(p-2)) <= c && c <= uchar(*p)) + return sig; + } + else if (uchar(*p) == c) return sig; + } + return !sig; +} + + +static int singlematch (MatchState *ms, const char *s, const char *p, + const char *ep) { + if (s >= ms->src_end) + return 0; + else { + int c = uchar(*s); + switch (*p) { + case '.': return 1; /* matches any char */ + case L_ESC: return match_class(c, uchar(*(p+1))); + case '[': return matchbracketclass(c, p, ep-1); + default: return (uchar(*p) == c); + } + } +} + + +static const char *matchbalance (MatchState *ms, const char *s, + const char *p) { + if (l_unlikely(p >= ms->p_end - 1)) + luaL_error(ms->L, "malformed pattern (missing arguments to '%%b')"); + if (*s != *p) return NULL; + else { + int b = *p; + int e = *(p+1); + int cont = 1; + while (++s < ms->src_end) { + if (*s == e) { + if (--cont == 0) return s+1; + } + else if (*s == b) cont++; + } + } + return NULL; /* string ends out of balance */ +} + + +static const char *max_expand (MatchState *ms, const char *s, + const char *p, const char *ep) { + ptrdiff_t i = 0; /* counts maximum expand for item */ + while (singlematch(ms, s + i, p, ep)) + i++; + /* keeps trying to match with the maximum repetitions */ + while (i>=0) { + const char *res = match(ms, (s+i), ep+1); + if (res) return res; + i--; /* else didn't match; reduce 1 repetition to try again */ + } + return NULL; +} + + +static const char *min_expand (MatchState *ms, const char *s, + const char *p, const char *ep) { + for (;;) { + const char *res = match(ms, s, ep+1); + if (res != NULL) + return res; + else if (singlematch(ms, s, p, ep)) + s++; /* try with one more repetition */ + else return NULL; + } +} + + +static const char *start_capture (MatchState *ms, const char *s, + const char *p, int what) { + const char *res; + int level = ms->level; + if (level >= LUA_MAXCAPTURES) luaL_error(ms->L, "too many captures"); + ms->capture[level].init = s; + ms->capture[level].len = what; + ms->level = level+1; + if ((res=match(ms, s, p)) == NULL) /* match failed? */ + ms->level--; /* undo capture */ + return res; +} + + +static const char *end_capture (MatchState *ms, const char *s, + const char *p) { + int l = capture_to_close(ms); + const char *res; + ms->capture[l].len = s - ms->capture[l].init; /* close capture */ + if ((res = match(ms, s, p)) == NULL) /* match failed? */ + ms->capture[l].len = CAP_UNFINISHED; /* undo capture */ + return res; +} + + +static const char *match_capture (MatchState *ms, const char *s, int l) { + size_t len; + l = check_capture(ms, l); + len = ms->capture[l].len; + if ((size_t)(ms->src_end-s) >= len && + memcmp(ms->capture[l].init, s, len) == 0) + return s+len; + else return NULL; +} + + +static const char *match (MatchState *ms, const char *s, const char *p) { + if (l_unlikely(ms->matchdepth-- == 0)) + luaL_error(ms->L, "pattern too complex"); + init: /* using goto to optimize tail recursion */ + if (p != ms->p_end) { /* end of pattern? */ + switch (*p) { + case '(': { /* start capture */ + if (*(p + 1) == ')') /* position capture? */ + s = start_capture(ms, s, p + 2, CAP_POSITION); + else + s = start_capture(ms, s, p + 1, CAP_UNFINISHED); + break; + } + case ')': { /* end capture */ + s = end_capture(ms, s, p + 1); + break; + } + case '$': { + if ((p + 1) != ms->p_end) /* is the '$' the last char in pattern? */ + goto dflt; /* no; go to default */ + s = (s == ms->src_end) ? s : NULL; /* check end of string */ + break; + } + case L_ESC: { /* escaped sequences not in the format class[*+?-]? */ + switch (*(p + 1)) { + case 'b': { /* balanced string? */ + s = matchbalance(ms, s, p + 2); + if (s != NULL) { + p += 4; goto init; /* return match(ms, s, p + 4); */ + } /* else fail (s == NULL) */ + break; + } + case 'f': { /* frontier? */ + const char *ep; char previous; + p += 2; + if (l_unlikely(*p != '[')) + luaL_error(ms->L, "missing '[' after '%%f' in pattern"); + ep = classend(ms, p); /* points to what is next */ + previous = (s == ms->src_init) ? '\0' : *(s - 1); + if (!matchbracketclass(uchar(previous), p, ep - 1) && + matchbracketclass(uchar(*s), p, ep - 1)) { + p = ep; goto init; /* return match(ms, s, ep); */ + } + s = NULL; /* match failed */ + break; + } + case '0': case '1': case '2': case '3': + case '4': case '5': case '6': case '7': + case '8': case '9': { /* capture results (%0-%9)? */ + s = match_capture(ms, s, uchar(*(p + 1))); + if (s != NULL) { + p += 2; goto init; /* return match(ms, s, p + 2) */ + } + break; + } + default: goto dflt; + } + break; + } + default: dflt: { /* pattern class plus optional suffix */ + const char *ep = classend(ms, p); /* points to optional suffix */ + /* does not match at least once? */ + if (!singlematch(ms, s, p, ep)) { + if (*ep == '*' || *ep == '?' || *ep == '-') { /* accept empty? */ + p = ep + 1; goto init; /* return match(ms, s, ep + 1); */ + } + else /* '+' or no suffix */ + s = NULL; /* fail */ + } + else { /* matched once */ + switch (*ep) { /* handle optional suffix */ + case '?': { /* optional */ + const char *res; + if ((res = match(ms, s + 1, ep + 1)) != NULL) + s = res; + else { + p = ep + 1; goto init; /* else return match(ms, s, ep + 1); */ + } + break; + } + case '+': /* 1 or more repetitions */ + s++; /* 1 match already done */ + /* FALLTHROUGH */ + case '*': /* 0 or more repetitions */ + s = max_expand(ms, s, p, ep); + break; + case '-': /* 0 or more repetitions (minimum) */ + s = min_expand(ms, s, p, ep); + break; + default: /* no suffix */ + s++; p = ep; goto init; /* return match(ms, s + 1, ep); */ + } + } + break; + } + } + } + ms->matchdepth++; + return s; +} + + + +static const char *lmemfind (const char *s1, size_t l1, + const char *s2, size_t l2) { + if (l2 == 0) return s1; /* empty strings are everywhere */ + else if (l2 > l1) return NULL; /* avoids a negative 'l1' */ + else { + const char *init; /* to search for a '*s2' inside 's1' */ + l2--; /* 1st char will be checked by 'memchr' */ + l1 = l1-l2; /* 's2' cannot be found after that */ + while (l1 > 0 && (init = (const char *)memchr(s1, *s2, l1)) != NULL) { + init++; /* 1st char is already checked */ + if (memcmp(init, s2+1, l2) == 0) + return init-1; + else { /* correct 'l1' and 's1' to try again */ + l1 -= init-s1; + s1 = init; + } + } + return NULL; /* not found */ + } +} + + +/* +** get information about the i-th capture. If there are no captures +** and 'i==0', return information about the whole match, which +** is the range 's'..'e'. If the capture is a string, return +** its length and put its address in '*cap'. If it is an integer +** (a position), push it on the stack and return CAP_POSITION. +*/ +static size_t get_onecapture (MatchState *ms, int i, const char *s, + const char *e, const char **cap) { + if (i >= ms->level) { + if (l_unlikely(i != 0)) + luaL_error(ms->L, "invalid capture index %%%d", i + 1); + *cap = s; + return e - s; + } + else { + ptrdiff_t capl = ms->capture[i].len; + *cap = ms->capture[i].init; + if (l_unlikely(capl == CAP_UNFINISHED)) + luaL_error(ms->L, "unfinished capture"); + else if (capl == CAP_POSITION) + lua_pushinteger(ms->L, (ms->capture[i].init - ms->src_init) + 1); + return capl; + } +} + + +/* +** Push the i-th capture on the stack. +*/ +static void push_onecapture (MatchState *ms, int i, const char *s, + const char *e) { + const char *cap; + ptrdiff_t l = get_onecapture(ms, i, s, e, &cap); + if (l != CAP_POSITION) + lua_pushlstring(ms->L, cap, l); + /* else position was already pushed */ +} + + +static int push_captures (MatchState *ms, const char *s, const char *e) { + int i; + int nlevels = (ms->level == 0 && s) ? 1 : ms->level; + luaL_checkstack(ms->L, nlevels, "too many captures"); + for (i = 0; i < nlevels; i++) + push_onecapture(ms, i, s, e); + return nlevels; /* number of strings pushed */ +} + + +/* check whether pattern has no special characters */ +static int nospecials (const char *p, size_t l) { + size_t upto = 0; + do { + if (strpbrk(p + upto, SPECIALS)) + return 0; /* pattern has a special character */ + upto += strlen(p + upto) + 1; /* may have more after \0 */ + } while (upto <= l); + return 1; /* no special chars found */ +} + + +static void prepstate (MatchState *ms, lua_State *L, + const char *s, size_t ls, const char *p, size_t lp) { + ms->L = L; + ms->matchdepth = MAXCCALLS; + ms->src_init = s; + ms->src_end = s + ls; + ms->p_end = p + lp; +} + + +static void reprepstate (MatchState *ms) { + ms->level = 0; + lua_assert(ms->matchdepth == MAXCCALLS); +} + + +static int str_find_aux (lua_State *L, int find) { + size_t ls, lp; + const char *s = luaL_checklstring(L, 1, &ls); + const char *p = luaL_checklstring(L, 2, &lp); + size_t init = posrelatI(luaL_optinteger(L, 3, 1), ls) - 1; + if (init > ls) { /* start after string's end? */ + luaL_pushfail(L); /* cannot find anything */ + return 1; + } + /* explicit request or no special characters? */ + if (find && (lua_toboolean(L, 4) || nospecials(p, lp))) { + /* do a plain search */ + const char *s2 = lmemfind(s + init, ls - init, p, lp); + if (s2) { + lua_pushinteger(L, (s2 - s) + 1); + lua_pushinteger(L, (s2 - s) + lp); + return 2; + } + } + else { + MatchState ms; + const char *s1 = s + init; + int anchor = (*p == '^'); + if (anchor) { + p++; lp--; /* skip anchor character */ + } + prepstate(&ms, L, s, ls, p, lp); + do { + const char *res; + reprepstate(&ms); + if ((res=match(&ms, s1, p)) != NULL) { + if (find) { + lua_pushinteger(L, (s1 - s) + 1); /* start */ + lua_pushinteger(L, res - s); /* end */ + return push_captures(&ms, NULL, 0) + 2; + } + else + return push_captures(&ms, s1, res); + } + } while (s1++ < ms.src_end && !anchor); + } + luaL_pushfail(L); /* not found */ + return 1; +} + + +static int str_find (lua_State *L) { + return str_find_aux(L, 1); +} + + +static int str_match (lua_State *L) { + return str_find_aux(L, 0); +} + + +/* state for 'gmatch' */ +typedef struct GMatchState { + const char *src; /* current position */ + const char *p; /* pattern */ + const char *lastmatch; /* end of last match */ + MatchState ms; /* match state */ +} GMatchState; + + +static int gmatch_aux (lua_State *L) { + GMatchState *gm = (GMatchState *)lua_touserdata(L, lua_upvalueindex(3)); + const char *src; + gm->ms.L = L; + for (src = gm->src; src <= gm->ms.src_end; src++) { + const char *e; + reprepstate(&gm->ms); + if ((e = match(&gm->ms, src, gm->p)) != NULL && e != gm->lastmatch) { + gm->src = gm->lastmatch = e; + return push_captures(&gm->ms, src, e); + } + } + return 0; /* not found */ +} + + +static int gmatch (lua_State *L) { + size_t ls, lp; + const char *s = luaL_checklstring(L, 1, &ls); + const char *p = luaL_checklstring(L, 2, &lp); + size_t init = posrelatI(luaL_optinteger(L, 3, 1), ls) - 1; + GMatchState *gm; + lua_settop(L, 2); /* keep strings on closure to avoid being collected */ + gm = (GMatchState *)lua_newuserdatauv(L, sizeof(GMatchState), 0); + if (init > ls) /* start after string's end? */ + init = ls + 1; /* avoid overflows in 's + init' */ + prepstate(&gm->ms, L, s, ls, p, lp); + gm->src = s + init; gm->p = p; gm->lastmatch = NULL; + lua_pushcclosure(L, gmatch_aux, 3); + return 1; +} + + +static void add_s (MatchState *ms, luaL_Buffer *b, const char *s, + const char *e) { + size_t l; + lua_State *L = ms->L; + const char *news = lua_tolstring(L, 3, &l); + const char *p; + while ((p = (char *)memchr(news, L_ESC, l)) != NULL) { + luaL_addlstring(b, news, p - news); + p++; /* skip ESC */ + if (*p == L_ESC) /* '%%' */ + luaL_addchar(b, *p); + else if (*p == '0') /* '%0' */ + luaL_addlstring(b, s, e - s); + else if (isdigit(uchar(*p))) { /* '%n' */ + const char *cap; + ptrdiff_t resl = get_onecapture(ms, *p - '1', s, e, &cap); + if (resl == CAP_POSITION) + luaL_addvalue(b); /* add position to accumulated result */ + else + luaL_addlstring(b, cap, resl); + } + else + luaL_error(L, "invalid use of '%c' in replacement string", L_ESC); + l -= p + 1 - news; + news = p + 1; + } + luaL_addlstring(b, news, l); +} + + +/* +** Add the replacement value to the string buffer 'b'. +** Return true if the original string was changed. (Function calls and +** table indexing resulting in nil or false do not change the subject.) +*/ +static int add_value (MatchState *ms, luaL_Buffer *b, const char *s, + const char *e, int tr) { + lua_State *L = ms->L; + switch (tr) { + case LUA_TFUNCTION: { /* call the function */ + int n; + lua_pushvalue(L, 3); /* push the function */ + n = push_captures(ms, s, e); /* all captures as arguments */ + lua_call(L, n, 1); /* call it */ + break; + } + case LUA_TTABLE: { /* index the table */ + push_onecapture(ms, 0, s, e); /* first capture is the index */ + lua_gettable(L, 3); + break; + } + default: { /* LUA_TNUMBER or LUA_TSTRING */ + add_s(ms, b, s, e); /* add value to the buffer */ + return 1; /* something changed */ + } + } + if (!lua_toboolean(L, -1)) { /* nil or false? */ + lua_pop(L, 1); /* remove value */ + luaL_addlstring(b, s, e - s); /* keep original text */ + return 0; /* no changes */ + } + else if (l_unlikely(!lua_isstring(L, -1))) + return luaL_error(L, "invalid replacement value (a %s)", + luaL_typename(L, -1)); + else { + luaL_addvalue(b); /* add result to accumulator */ + return 1; /* something changed */ + } +} + + +static int str_gsub (lua_State *L) { + size_t srcl, lp; + const char *src = luaL_checklstring(L, 1, &srcl); /* subject */ + const char *p = luaL_checklstring(L, 2, &lp); /* pattern */ + const char *lastmatch = NULL; /* end of last match */ + int tr = lua_type(L, 3); /* replacement type */ + lua_Integer max_s = luaL_optinteger(L, 4, srcl + 1); /* max replacements */ + int anchor = (*p == '^'); + lua_Integer n = 0; /* replacement count */ + int changed = 0; /* change flag */ + MatchState ms; + luaL_Buffer b; + luaL_argexpected(L, tr == LUA_TNUMBER || tr == LUA_TSTRING || + tr == LUA_TFUNCTION || tr == LUA_TTABLE, 3, + "string/function/table"); + luaL_buffinit(L, &b); + if (anchor) { + p++; lp--; /* skip anchor character */ + } + prepstate(&ms, L, src, srcl, p, lp); + while (n < max_s) { + const char *e; + reprepstate(&ms); /* (re)prepare state for new match */ + if ((e = match(&ms, src, p)) != NULL && e != lastmatch) { /* match? */ + n++; + changed = add_value(&ms, &b, src, e, tr) | changed; + src = lastmatch = e; + } + else if (src < ms.src_end) /* otherwise, skip one character */ + luaL_addchar(&b, *src++); + else break; /* end of subject */ + if (anchor) break; + } + if (!changed) /* no changes? */ + lua_pushvalue(L, 1); /* return original string */ + else { /* something changed */ + luaL_addlstring(&b, src, ms.src_end-src); + luaL_pushresult(&b); /* create and return new string */ + } + lua_pushinteger(L, n); /* number of substitutions */ + return 2; +} + +/* }====================================================== */ + + + +/* +** {====================================================== +** STRING FORMAT +** ======================================================= +*/ + +#if !defined(lua_number2strx) /* { */ + +/* +** Hexadecimal floating-point formatter +*/ + +#define SIZELENMOD (sizeof(LUA_NUMBER_FRMLEN)/sizeof(char)) + + +/* +** Number of bits that goes into the first digit. It can be any value +** between 1 and 4; the following definition tries to align the number +** to nibble boundaries by making what is left after that first digit a +** multiple of 4. +*/ +#define L_NBFD ((l_floatatt(MANT_DIG) - 1)%4 + 1) + + +/* +** Add integer part of 'x' to buffer and return new 'x' +*/ +static lua_Number adddigit (char *buff, int n, lua_Number x) { + lua_Number dd = l_mathop(floor)(x); /* get integer part from 'x' */ + int d = (int)dd; + buff[n] = (d < 10 ? d + '0' : d - 10 + 'a'); /* add to buffer */ + return x - dd; /* return what is left */ +} + + +static int num2straux (char *buff, int sz, lua_Number x) { + /* if 'inf' or 'NaN', format it like '%g' */ + if (x != x || x == (lua_Number)HUGE_VAL || x == -(lua_Number)HUGE_VAL) + return l_sprintf(buff, sz, LUA_NUMBER_FMT, (LUAI_UACNUMBER)x); + else if (x == 0) { /* can be -0... */ + /* create "0" or "-0" followed by exponent */ + return l_sprintf(buff, sz, LUA_NUMBER_FMT "x0p+0", (LUAI_UACNUMBER)x); + } + else { + int e; + lua_Number m = l_mathop(frexp)(x, &e); /* 'x' fraction and exponent */ + int n = 0; /* character count */ + if (m < 0) { /* is number negative? */ + buff[n++] = '-'; /* add sign */ + m = -m; /* make it positive */ + } + buff[n++] = '0'; buff[n++] = 'x'; /* add "0x" */ + m = adddigit(buff, n++, m * (1 << L_NBFD)); /* add first digit */ + e -= L_NBFD; /* this digit goes before the radix point */ + if (m > 0) { /* more digits? */ + buff[n++] = lua_getlocaledecpoint(); /* add radix point */ + do { /* add as many digits as needed */ + m = adddigit(buff, n++, m * 16); + } while (m > 0); + } + n += l_sprintf(buff + n, sz - n, "p%+d", e); /* add exponent */ + lua_assert(n < sz); + return n; + } +} + + +static int lua_number2strx (lua_State *L, char *buff, int sz, + const char *fmt, lua_Number x) { + int n = num2straux(buff, sz, x); + if (fmt[SIZELENMOD] == 'A') { + int i; + for (i = 0; i < n; i++) + buff[i] = toupper(uchar(buff[i])); + } + else if (l_unlikely(fmt[SIZELENMOD] != 'a')) + return luaL_error(L, "modifiers for format '%%a'/'%%A' not implemented"); + return n; +} + +#endif /* } */ + + +/* +** Maximum size for items formatted with '%f'. This size is produced +** by format('%.99f', -maxfloat), and is equal to 99 + 3 ('-', '.', +** and '\0') + number of decimal digits to represent maxfloat (which +** is maximum exponent + 1). (99+3+1, adding some extra, 110) +*/ +#define MAX_ITEMF (110 + l_floatatt(MAX_10_EXP)) + + +/* +** All formats except '%f' do not need that large limit. The other +** float formats use exponents, so that they fit in the 99 limit for +** significant digits; 's' for large strings and 'q' add items directly +** to the buffer; all integer formats also fit in the 99 limit. The +** worst case are floats: they may need 99 significant digits, plus +** '0x', '-', '.', 'e+XXXX', and '\0'. Adding some extra, 120. +*/ +#define MAX_ITEM 120 + + +/* valid flags in a format specification */ +#if !defined(L_FMTFLAGSF) + +/* valid flags for a, A, e, E, f, F, g, and G conversions */ +#define L_FMTFLAGSF "-+#0 " + +/* valid flags for o, x, and X conversions */ +#define L_FMTFLAGSX "-#0" + +/* valid flags for d and i conversions */ +#define L_FMTFLAGSI "-+0 " + +/* valid flags for u conversions */ +#define L_FMTFLAGSU "-0" + +/* valid flags for c, p, and s conversions */ +#define L_FMTFLAGSC "-" + +#endif + + +/* +** Maximum size of each format specification (such as "%-099.99d"): +** Initial '%', flags (up to 5), width (2), period, precision (2), +** length modifier (8), conversion specifier, and final '\0', plus some +** extra. +*/ +#define MAX_FORMAT 32 + + +static void addquoted (luaL_Buffer *b, const char *s, size_t len) { + luaL_addchar(b, '"'); + while (len--) { + if (*s == '"' || *s == '\\' || *s == '\n') { + luaL_addchar(b, '\\'); + luaL_addchar(b, *s); + } + else if (iscntrl(uchar(*s))) { + char buff[10]; + if (!isdigit(uchar(*(s+1)))) + l_sprintf(buff, sizeof(buff), "\\%d", (int)uchar(*s)); + else + l_sprintf(buff, sizeof(buff), "\\%03d", (int)uchar(*s)); + luaL_addstring(b, buff); + } + else + luaL_addchar(b, *s); + s++; + } + luaL_addchar(b, '"'); +} + + +/* +** Serialize a floating-point number in such a way that it can be +** scanned back by Lua. Use hexadecimal format for "common" numbers +** (to preserve precision); inf, -inf, and NaN are handled separately. +** (NaN cannot be expressed as a numeral, so we write '(0/0)' for it.) +*/ +static int quotefloat (lua_State *L, char *buff, lua_Number n) { + const char *s; /* for the fixed representations */ + if (n == (lua_Number)HUGE_VAL) /* inf? */ + s = "1e9999"; + else if (n == -(lua_Number)HUGE_VAL) /* -inf? */ + s = "-1e9999"; + else if (n != n) /* NaN? */ + s = "(0/0)"; + else { /* format number as hexadecimal */ + int nb = lua_number2strx(L, buff, MAX_ITEM, + "%" LUA_NUMBER_FRMLEN "a", n); + /* ensures that 'buff' string uses a dot as the radix character */ + if (memchr(buff, '.', nb) == NULL) { /* no dot? */ + char point = lua_getlocaledecpoint(); /* try locale point */ + char *ppoint = (char *)memchr(buff, point, nb); + if (ppoint) *ppoint = '.'; /* change it to a dot */ + } + return nb; + } + /* for the fixed representations */ + return l_sprintf(buff, MAX_ITEM, "%s", s); +} + + +static void addliteral (lua_State *L, luaL_Buffer *b, int arg) { + switch (lua_type(L, arg)) { + case LUA_TSTRING: { + size_t len; + const char *s = lua_tolstring(L, arg, &len); + addquoted(b, s, len); + break; + } + case LUA_TNUMBER: { + char *buff = luaL_prepbuffsize(b, MAX_ITEM); + int nb; + if (!lua_isinteger(L, arg)) /* float? */ + nb = quotefloat(L, buff, lua_tonumber(L, arg)); + else { /* integers */ + lua_Integer n = lua_tointeger(L, arg); + const char *format = (n == LUA_MININTEGER) /* corner case? */ + ? "0x%" LUA_INTEGER_FRMLEN "x" /* use hex */ + : LUA_INTEGER_FMT; /* else use default format */ + nb = l_sprintf(buff, MAX_ITEM, format, (LUAI_UACINT)n); + } + luaL_addsize(b, nb); + break; + } + case LUA_TNIL: case LUA_TBOOLEAN: { + luaL_tolstring(L, arg, NULL); + luaL_addvalue(b); + break; + } + default: { + luaL_argerror(L, arg, "value has no literal form"); + } + } +} + + +static const char *get2digits (const char *s) { + if (isdigit(uchar(*s))) { + s++; + if (isdigit(uchar(*s))) s++; /* (2 digits at most) */ + } + return s; +} + + +/* +** Check whether a conversion specification is valid. When called, +** first character in 'form' must be '%' and last character must +** be a valid conversion specifier. 'flags' are the accepted flags; +** 'precision' signals whether to accept a precision. +*/ +static void checkformat (lua_State *L, const char *form, const char *flags, + int precision) { + const char *spec = form + 1; /* skip '%' */ + spec += strspn(spec, flags); /* skip flags */ + if (*spec != '0') { /* a width cannot start with '0' */ + spec = get2digits(spec); /* skip width */ + if (*spec == '.' && precision) { + spec++; + spec = get2digits(spec); /* skip precision */ + } + } + if (!isalpha(uchar(*spec))) /* did not go to the end? */ + luaL_error(L, "invalid conversion specification: '%s'", form); +} + + +/* +** Get a conversion specification and copy it to 'form'. +** Return the address of its last character. +*/ +static const char *getformat (lua_State *L, const char *strfrmt, + char *form) { + /* spans flags, width, and precision ('0' is included as a flag) */ + size_t len = strspn(strfrmt, L_FMTFLAGSF "123456789."); + len++; /* adds following character (should be the specifier) */ + /* still needs space for '%', '\0', plus a length modifier */ + if (len >= MAX_FORMAT - 10) + luaL_error(L, "invalid format (too long)"); + *(form++) = '%'; + memcpy(form, strfrmt, len * sizeof(char)); + *(form + len) = '\0'; + return strfrmt + len - 1; +} + + +/* +** add length modifier into formats +*/ +static void addlenmod (char *form, const char *lenmod) { + size_t l = strlen(form); + size_t lm = strlen(lenmod); + char spec = form[l - 1]; + strcpy(form + l - 1, lenmod); + form[l + lm - 1] = spec; + form[l + lm] = '\0'; +} + + +static int str_format (lua_State *L) { + int top = lua_gettop(L); + int arg = 1; + size_t sfl; + const char *strfrmt = luaL_checklstring(L, arg, &sfl); + const char *strfrmt_end = strfrmt+sfl; + const char *flags; + luaL_Buffer b; + luaL_buffinit(L, &b); + while (strfrmt < strfrmt_end) { + if (*strfrmt != L_ESC) + luaL_addchar(&b, *strfrmt++); + else if (*++strfrmt == L_ESC) + luaL_addchar(&b, *strfrmt++); /* %% */ + else { /* format item */ + char form[MAX_FORMAT]; /* to store the format ('%...') */ + int maxitem = MAX_ITEM; /* maximum length for the result */ + char *buff = luaL_prepbuffsize(&b, maxitem); /* to put result */ + int nb = 0; /* number of bytes in result */ + if (++arg > top) + return luaL_argerror(L, arg, "no value"); + strfrmt = getformat(L, strfrmt, form); + switch (*strfrmt++) { + case 'c': { + checkformat(L, form, L_FMTFLAGSC, 0); + nb = l_sprintf(buff, maxitem, form, (int)luaL_checkinteger(L, arg)); + break; + } + case 'd': case 'i': + flags = L_FMTFLAGSI; + goto intcase; + case 'u': + flags = L_FMTFLAGSU; + goto intcase; + case 'o': case 'x': case 'X': + flags = L_FMTFLAGSX; + intcase: { + lua_Integer n = luaL_checkinteger(L, arg); + checkformat(L, form, flags, 1); + addlenmod(form, LUA_INTEGER_FRMLEN); + nb = l_sprintf(buff, maxitem, form, (LUAI_UACINT)n); + break; + } + case 'a': case 'A': + checkformat(L, form, L_FMTFLAGSF, 1); + addlenmod(form, LUA_NUMBER_FRMLEN); + nb = lua_number2strx(L, buff, maxitem, form, + luaL_checknumber(L, arg)); + break; + case 'f': + maxitem = MAX_ITEMF; /* extra space for '%f' */ + buff = luaL_prepbuffsize(&b, maxitem); + /* FALLTHROUGH */ + case 'e': case 'E': case 'g': case 'G': { + lua_Number n = luaL_checknumber(L, arg); + checkformat(L, form, L_FMTFLAGSF, 1); + addlenmod(form, LUA_NUMBER_FRMLEN); + nb = l_sprintf(buff, maxitem, form, (LUAI_UACNUMBER)n); + break; + } + case 'p': { + const void *p = lua_topointer(L, arg); + checkformat(L, form, L_FMTFLAGSC, 0); + if (p == NULL) { /* avoid calling 'printf' with argument NULL */ + p = "(null)"; /* result */ + form[strlen(form) - 1] = 's'; /* format it as a string */ + } + nb = l_sprintf(buff, maxitem, form, p); + break; + } + case 'q': { + if (form[2] != '\0') /* modifiers? */ + return luaL_error(L, "specifier '%%q' cannot have modifiers"); + addliteral(L, &b, arg); + break; + } + case 's': { + size_t l; + const char *s = luaL_tolstring(L, arg, &l); + if (form[2] == '\0') /* no modifiers? */ + luaL_addvalue(&b); /* keep entire string */ + else { + luaL_argcheck(L, l == strlen(s), arg, "string contains zeros"); + checkformat(L, form, L_FMTFLAGSC, 1); + if (strchr(form, '.') == NULL && l >= 100) { + /* no precision and string is too long to be formatted */ + luaL_addvalue(&b); /* keep entire string */ + } + else { /* format the string into 'buff' */ + nb = l_sprintf(buff, maxitem, form, s); + lua_pop(L, 1); /* remove result from 'luaL_tolstring' */ + } + } + break; + } + default: { /* also treat cases 'pnLlh' */ + return luaL_error(L, "invalid conversion '%s' to 'format'", form); + } + } + lua_assert(nb < maxitem); + luaL_addsize(&b, nb); + } + } + luaL_pushresult(&b); + return 1; +} + +/* }====================================================== */ + + +/* +** {====================================================== +** PACK/UNPACK +** ======================================================= +*/ + + +/* value used for padding */ +#if !defined(LUAL_PACKPADBYTE) +#define LUAL_PACKPADBYTE 0x00 +#endif + +/* maximum size for the binary representation of an integer */ +#define MAXINTSIZE 16 + +/* number of bits in a character */ +#define NB CHAR_BIT + +/* mask for one character (NB 1's) */ +#define MC ((1 << NB) - 1) + +/* size of a lua_Integer */ +#define SZINT ((int)sizeof(lua_Integer)) + + +/* dummy union to get native endianness */ +static const union { + int dummy; + char little; /* true iff machine is little endian */ +} nativeendian = {1}; + + +/* +** information to pack/unpack stuff +*/ +typedef struct Header { + lua_State *L; + int islittle; + int maxalign; +} Header; + + +/* +** options for pack/unpack +*/ +typedef enum KOption { + Kint, /* signed integers */ + Kuint, /* unsigned integers */ + Kfloat, /* single-precision floating-point numbers */ + Knumber, /* Lua "native" floating-point numbers */ + Kdouble, /* double-precision floating-point numbers */ + Kchar, /* fixed-length strings */ + Kstring, /* strings with prefixed length */ + Kzstr, /* zero-terminated strings */ + Kpadding, /* padding */ + Kpaddalign, /* padding for alignment */ + Knop /* no-op (configuration or spaces) */ +} KOption; + + +/* +** Read an integer numeral from string 'fmt' or return 'df' if +** there is no numeral +*/ +static int digit (int c) { return '0' <= c && c <= '9'; } + +static int getnum (const char **fmt, int df) { + if (!digit(**fmt)) /* no number? */ + return df; /* return default value */ + else { + int a = 0; + do { + a = a*10 + (*((*fmt)++) - '0'); + } while (digit(**fmt) && a <= ((int)MAXSIZE - 9)/10); + return a; + } +} + + +/* +** Read an integer numeral and raises an error if it is larger +** than the maximum size for integers. +*/ +static int getnumlimit (Header *h, const char **fmt, int df) { + int sz = getnum(fmt, df); + if (l_unlikely(sz > MAXINTSIZE || sz <= 0)) + return luaL_error(h->L, "integral size (%d) out of limits [1,%d]", + sz, MAXINTSIZE); + return sz; +} + + +/* +** Initialize Header +*/ +static void initheader (lua_State *L, Header *h) { + h->L = L; + h->islittle = nativeendian.little; + h->maxalign = 1; +} + + +/* +** Read and classify next option. 'size' is filled with option's size. +*/ +static KOption getoption (Header *h, const char **fmt, int *size) { + /* dummy structure to get native alignment requirements */ + struct cD { char c; union { LUAI_MAXALIGN; } u; }; + int opt = *((*fmt)++); + *size = 0; /* default */ + switch (opt) { + case 'b': *size = sizeof(char); return Kint; + case 'B': *size = sizeof(char); return Kuint; + case 'h': *size = sizeof(short); return Kint; + case 'H': *size = sizeof(short); return Kuint; + case 'l': *size = sizeof(long); return Kint; + case 'L': *size = sizeof(long); return Kuint; + case 'j': *size = sizeof(lua_Integer); return Kint; + case 'J': *size = sizeof(lua_Integer); return Kuint; + case 'T': *size = sizeof(size_t); return Kuint; + case 'f': *size = sizeof(float); return Kfloat; + case 'n': *size = sizeof(lua_Number); return Knumber; + case 'd': *size = sizeof(double); return Kdouble; + case 'i': *size = getnumlimit(h, fmt, sizeof(int)); return Kint; + case 'I': *size = getnumlimit(h, fmt, sizeof(int)); return Kuint; + case 's': *size = getnumlimit(h, fmt, sizeof(size_t)); return Kstring; + case 'c': + *size = getnum(fmt, -1); + if (l_unlikely(*size == -1)) + luaL_error(h->L, "missing size for format option 'c'"); + return Kchar; + case 'z': return Kzstr; + case 'x': *size = 1; return Kpadding; + case 'X': return Kpaddalign; + case ' ': break; + case '<': h->islittle = 1; break; + case '>': h->islittle = 0; break; + case '=': h->islittle = nativeendian.little; break; + case '!': { + const int maxalign = offsetof(struct cD, u); + h->maxalign = getnumlimit(h, fmt, maxalign); + break; + } + default: luaL_error(h->L, "invalid format option '%c'", opt); + } + return Knop; +} + + +/* +** Read, classify, and fill other details about the next option. +** 'psize' is filled with option's size, 'notoalign' with its +** alignment requirements. +** Local variable 'size' gets the size to be aligned. (Kpadal option +** always gets its full alignment, other options are limited by +** the maximum alignment ('maxalign'). Kchar option needs no alignment +** despite its size. +*/ +static KOption getdetails (Header *h, size_t totalsize, + const char **fmt, int *psize, int *ntoalign) { + KOption opt = getoption(h, fmt, psize); + int align = *psize; /* usually, alignment follows size */ + if (opt == Kpaddalign) { /* 'X' gets alignment from following option */ + if (**fmt == '\0' || getoption(h, fmt, &align) == Kchar || align == 0) + luaL_argerror(h->L, 1, "invalid next option for option 'X'"); + } + if (align <= 1 || opt == Kchar) /* need no alignment? */ + *ntoalign = 0; + else { + if (align > h->maxalign) /* enforce maximum alignment */ + align = h->maxalign; + if (l_unlikely((align & (align - 1)) != 0)) /* not a power of 2? */ + luaL_argerror(h->L, 1, "format asks for alignment not power of 2"); + *ntoalign = (align - (int)(totalsize & (align - 1))) & (align - 1); + } + return opt; +} + + +/* +** Pack integer 'n' with 'size' bytes and 'islittle' endianness. +** The final 'if' handles the case when 'size' is larger than +** the size of a Lua integer, correcting the extra sign-extension +** bytes if necessary (by default they would be zeros). +*/ +static void packint (luaL_Buffer *b, lua_Unsigned n, + int islittle, int size, int neg) { + char *buff = luaL_prepbuffsize(b, size); + int i; + buff[islittle ? 0 : size - 1] = (char)(n & MC); /* first byte */ + for (i = 1; i < size; i++) { + n >>= NB; + buff[islittle ? i : size - 1 - i] = (char)(n & MC); + } + if (neg && size > SZINT) { /* negative number need sign extension? */ + for (i = SZINT; i < size; i++) /* correct extra bytes */ + buff[islittle ? i : size - 1 - i] = (char)MC; + } + luaL_addsize(b, size); /* add result to buffer */ +} + + +/* +** Copy 'size' bytes from 'src' to 'dest', correcting endianness if +** given 'islittle' is different from native endianness. +*/ +static void copywithendian (char *dest, const char *src, + int size, int islittle) { + if (islittle == nativeendian.little) + memcpy(dest, src, size); + else { + dest += size - 1; + while (size-- != 0) + *(dest--) = *(src++); + } +} + + +static int str_pack (lua_State *L) { + luaL_Buffer b; + Header h; + const char *fmt = luaL_checkstring(L, 1); /* format string */ + int arg = 1; /* current argument to pack */ + size_t totalsize = 0; /* accumulate total size of result */ + initheader(L, &h); + lua_pushnil(L); /* mark to separate arguments from string buffer */ + luaL_buffinit(L, &b); + while (*fmt != '\0') { + int size, ntoalign; + KOption opt = getdetails(&h, totalsize, &fmt, &size, &ntoalign); + totalsize += ntoalign + size; + while (ntoalign-- > 0) + luaL_addchar(&b, LUAL_PACKPADBYTE); /* fill alignment */ + arg++; + switch (opt) { + case Kint: { /* signed integers */ + lua_Integer n = luaL_checkinteger(L, arg); + if (size < SZINT) { /* need overflow check? */ + lua_Integer lim = (lua_Integer)1 << ((size * NB) - 1); + luaL_argcheck(L, -lim <= n && n < lim, arg, "integer overflow"); + } + packint(&b, (lua_Unsigned)n, h.islittle, size, (n < 0)); + break; + } + case Kuint: { /* unsigned integers */ + lua_Integer n = luaL_checkinteger(L, arg); + if (size < SZINT) /* need overflow check? */ + luaL_argcheck(L, (lua_Unsigned)n < ((lua_Unsigned)1 << (size * NB)), + arg, "unsigned overflow"); + packint(&b, (lua_Unsigned)n, h.islittle, size, 0); + break; + } + case Kfloat: { /* C float */ + float f = (float)luaL_checknumber(L, arg); /* get argument */ + char *buff = luaL_prepbuffsize(&b, sizeof(f)); + /* move 'f' to final result, correcting endianness if needed */ + copywithendian(buff, (char *)&f, sizeof(f), h.islittle); + luaL_addsize(&b, size); + break; + } + case Knumber: { /* Lua float */ + lua_Number f = luaL_checknumber(L, arg); /* get argument */ + char *buff = luaL_prepbuffsize(&b, sizeof(f)); + /* move 'f' to final result, correcting endianness if needed */ + copywithendian(buff, (char *)&f, sizeof(f), h.islittle); + luaL_addsize(&b, size); + break; + } + case Kdouble: { /* C double */ + double f = (double)luaL_checknumber(L, arg); /* get argument */ + char *buff = luaL_prepbuffsize(&b, sizeof(f)); + /* move 'f' to final result, correcting endianness if needed */ + copywithendian(buff, (char *)&f, sizeof(f), h.islittle); + luaL_addsize(&b, size); + break; + } + case Kchar: { /* fixed-size string */ + size_t len; + const char *s = luaL_checklstring(L, arg, &len); + luaL_argcheck(L, len <= (size_t)size, arg, + "string longer than given size"); + luaL_addlstring(&b, s, len); /* add string */ + while (len++ < (size_t)size) /* pad extra space */ + luaL_addchar(&b, LUAL_PACKPADBYTE); + break; + } + case Kstring: { /* strings with length count */ + size_t len; + const char *s = luaL_checklstring(L, arg, &len); + luaL_argcheck(L, size >= (int)sizeof(size_t) || + len < ((size_t)1 << (size * NB)), + arg, "string length does not fit in given size"); + packint(&b, (lua_Unsigned)len, h.islittle, size, 0); /* pack length */ + luaL_addlstring(&b, s, len); + totalsize += len; + break; + } + case Kzstr: { /* zero-terminated string */ + size_t len; + const char *s = luaL_checklstring(L, arg, &len); + luaL_argcheck(L, strlen(s) == len, arg, "string contains zeros"); + luaL_addlstring(&b, s, len); + luaL_addchar(&b, '\0'); /* add zero at the end */ + totalsize += len + 1; + break; + } + case Kpadding: luaL_addchar(&b, LUAL_PACKPADBYTE); /* FALLTHROUGH */ + case Kpaddalign: case Knop: + arg--; /* undo increment */ + break; + } + } + luaL_pushresult(&b); + return 1; +} + + +static int str_packsize (lua_State *L) { + Header h; + const char *fmt = luaL_checkstring(L, 1); /* format string */ + size_t totalsize = 0; /* accumulate total size of result */ + initheader(L, &h); + while (*fmt != '\0') { + int size, ntoalign; + KOption opt = getdetails(&h, totalsize, &fmt, &size, &ntoalign); + luaL_argcheck(L, opt != Kstring && opt != Kzstr, 1, + "variable-length format"); + size += ntoalign; /* total space used by option */ + luaL_argcheck(L, totalsize <= MAXSIZE - size, 1, + "format result too large"); + totalsize += size; + } + lua_pushinteger(L, (lua_Integer)totalsize); + return 1; +} + + +/* +** Unpack an integer with 'size' bytes and 'islittle' endianness. +** If size is smaller than the size of a Lua integer and integer +** is signed, must do sign extension (propagating the sign to the +** higher bits); if size is larger than the size of a Lua integer, +** it must check the unread bytes to see whether they do not cause an +** overflow. +*/ +static lua_Integer unpackint (lua_State *L, const char *str, + int islittle, int size, int issigned) { + lua_Unsigned res = 0; + int i; + int limit = (size <= SZINT) ? size : SZINT; + for (i = limit - 1; i >= 0; i--) { + res <<= NB; + res |= (lua_Unsigned)(unsigned char)str[islittle ? i : size - 1 - i]; + } + if (size < SZINT) { /* real size smaller than lua_Integer? */ + if (issigned) { /* needs sign extension? */ + lua_Unsigned mask = (lua_Unsigned)1 << (size*NB - 1); + res = ((res ^ mask) - mask); /* do sign extension */ + } + } + else if (size > SZINT) { /* must check unread bytes */ + int mask = (!issigned || (lua_Integer)res >= 0) ? 0 : MC; + for (i = limit; i < size; i++) { + if (l_unlikely((unsigned char)str[islittle ? i : size - 1 - i] != mask)) + luaL_error(L, "%d-byte integer does not fit into Lua Integer", size); + } + } + return (lua_Integer)res; +} + + +static int str_unpack (lua_State *L) { + Header h; + const char *fmt = luaL_checkstring(L, 1); + size_t ld; + const char *data = luaL_checklstring(L, 2, &ld); + size_t pos = posrelatI(luaL_optinteger(L, 3, 1), ld) - 1; + int n = 0; /* number of results */ + luaL_argcheck(L, pos <= ld, 3, "initial position out of string"); + initheader(L, &h); + while (*fmt != '\0') { + int size, ntoalign; + KOption opt = getdetails(&h, pos, &fmt, &size, &ntoalign); + luaL_argcheck(L, (size_t)ntoalign + size <= ld - pos, 2, + "data string too short"); + pos += ntoalign; /* skip alignment */ + /* stack space for item + next position */ + luaL_checkstack(L, 2, "too many results"); + n++; + switch (opt) { + case Kint: + case Kuint: { + lua_Integer res = unpackint(L, data + pos, h.islittle, size, + (opt == Kint)); + lua_pushinteger(L, res); + break; + } + case Kfloat: { + float f; + copywithendian((char *)&f, data + pos, sizeof(f), h.islittle); + lua_pushnumber(L, (lua_Number)f); + break; + } + case Knumber: { + lua_Number f; + copywithendian((char *)&f, data + pos, sizeof(f), h.islittle); + lua_pushnumber(L, f); + break; + } + case Kdouble: { + double f; + copywithendian((char *)&f, data + pos, sizeof(f), h.islittle); + lua_pushnumber(L, (lua_Number)f); + break; + } + case Kchar: { + lua_pushlstring(L, data + pos, size); + break; + } + case Kstring: { + size_t len = (size_t)unpackint(L, data + pos, h.islittle, size, 0); + luaL_argcheck(L, len <= ld - pos - size, 2, "data string too short"); + lua_pushlstring(L, data + pos + size, len); + pos += len; /* skip string */ + break; + } + case Kzstr: { + size_t len = strlen(data + pos); + luaL_argcheck(L, pos + len < ld, 2, + "unfinished string for format 'z'"); + lua_pushlstring(L, data + pos, len); + pos += len + 1; /* skip string plus final '\0' */ + break; + } + case Kpaddalign: case Kpadding: case Knop: + n--; /* undo increment */ + break; + } + pos += size; + } + lua_pushinteger(L, pos + 1); /* next position */ + return n + 1; +} + +/* }====================================================== */ + + +static const luaL_Reg strlib[] = { + {"byte", str_byte}, + {"char", str_char}, + {"dump", str_dump}, + {"find", str_find}, + {"format", str_format}, + {"gmatch", gmatch}, + {"gsub", str_gsub}, + {"len", str_len}, + {"lower", str_lower}, + {"match", str_match}, + {"rep", str_rep}, + {"reverse", str_reverse}, + {"sub", str_sub}, + {"upper", str_upper}, + {"pack", str_pack}, + {"packsize", str_packsize}, + {"unpack", str_unpack}, + {NULL, NULL} +}; + + +static void createmetatable (lua_State *L) { + /* table to be metatable for strings */ + luaL_newlibtable(L, stringmetamethods); + luaL_setfuncs(L, stringmetamethods, 0); + lua_pushliteral(L, ""); /* dummy string */ + lua_pushvalue(L, -2); /* copy table */ + lua_setmetatable(L, -2); /* set table as metatable for strings */ + lua_pop(L, 1); /* pop dummy string */ + lua_pushvalue(L, -2); /* get string library */ + lua_setfield(L, -2, "__index"); /* metatable.__index = string */ + lua_pop(L, 1); /* pop metatable */ +} + + +/* +** Open string library +*/ +LUAMOD_API int luaopen_string (lua_State *L) { + luaL_newlib(L, strlib); + createmetatable(L); + return 1; +} + diff --git a/06/lua-5.4.6/src/ltable.c b/06/lua-5.4.6/src/ltable.c new file mode 100644 index 0000000..3c690c5 --- /dev/null +++ b/06/lua-5.4.6/src/ltable.c @@ -0,0 +1,980 @@ +/* +** $Id: ltable.c $ +** Lua tables (hash) +** See Copyright Notice in lua.h +*/ + +#define ltable_c +#define LUA_CORE + +#include "lprefix.h" + + +/* +** Implementation of tables (aka arrays, objects, or hash tables). +** Tables keep its elements in two parts: an array part and a hash part. +** Non-negative integer keys are all candidates to be kept in the array +** part. The actual size of the array is the largest 'n' such that +** more than half the slots between 1 and n are in use. +** Hash uses a mix of chained scatter table with Brent's variation. +** A main invariant of these tables is that, if an element is not +** in its main position (i.e. the 'original' position that its hash gives +** to it), then the colliding element is in its own main position. +** Hence even when the load factor reaches 100%, performance remains good. +*/ + +#include +#include + +#include "lua.h" + +#include "ldebug.h" +#include "ldo.h" +#include "lgc.h" +#include "lmem.h" +#include "lobject.h" +#include "lstate.h" +#include "lstring.h" +#include "ltable.h" +#include "lvm.h" + + +/* +** MAXABITS is the largest integer such that MAXASIZE fits in an +** unsigned int. +*/ +#define MAXABITS cast_int(sizeof(int) * CHAR_BIT - 1) + + +/* +** MAXASIZE is the maximum size of the array part. It is the minimum +** between 2^MAXABITS and the maximum size that, measured in bytes, +** fits in a 'size_t'. +*/ +#define MAXASIZE luaM_limitN(1u << MAXABITS, TValue) + +/* +** MAXHBITS is the largest integer such that 2^MAXHBITS fits in a +** signed int. +*/ +#define MAXHBITS (MAXABITS - 1) + + +/* +** MAXHSIZE is the maximum size of the hash part. It is the minimum +** between 2^MAXHBITS and the maximum size such that, measured in bytes, +** it fits in a 'size_t'. +*/ +#define MAXHSIZE luaM_limitN(1u << MAXHBITS, Node) + + +/* +** When the original hash value is good, hashing by a power of 2 +** avoids the cost of '%'. +*/ +#define hashpow2(t,n) (gnode(t, lmod((n), sizenode(t)))) + +/* +** for other types, it is better to avoid modulo by power of 2, as +** they can have many 2 factors. +*/ +#define hashmod(t,n) (gnode(t, ((n) % ((sizenode(t)-1)|1)))) + + +#define hashstr(t,str) hashpow2(t, (str)->hash) +#define hashboolean(t,p) hashpow2(t, p) + + +#define hashpointer(t,p) hashmod(t, point2uint(p)) + + +#define dummynode (&dummynode_) + +static const Node dummynode_ = { + {{NULL}, LUA_VEMPTY, /* value's value and type */ + LUA_VNIL, 0, {NULL}} /* key type, next, and key value */ +}; + + +static const TValue absentkey = {ABSTKEYCONSTANT}; + + +/* +** Hash for integers. To allow a good hash, use the remainder operator +** ('%'). If integer fits as a non-negative int, compute an int +** remainder, which is faster. Otherwise, use an unsigned-integer +** remainder, which uses all bits and ensures a non-negative result. +*/ +static Node *hashint (const Table *t, lua_Integer i) { + lua_Unsigned ui = l_castS2U(i); + if (ui <= cast_uint(INT_MAX)) + return hashmod(t, cast_int(ui)); + else + return hashmod(t, ui); +} + + +/* +** Hash for floating-point numbers. +** The main computation should be just +** n = frexp(n, &i); return (n * INT_MAX) + i +** but there are some numerical subtleties. +** In a two-complement representation, INT_MAX does not has an exact +** representation as a float, but INT_MIN does; because the absolute +** value of 'frexp' is smaller than 1 (unless 'n' is inf/NaN), the +** absolute value of the product 'frexp * -INT_MIN' is smaller or equal +** to INT_MAX. Next, the use of 'unsigned int' avoids overflows when +** adding 'i'; the use of '~u' (instead of '-u') avoids problems with +** INT_MIN. +*/ +#if !defined(l_hashfloat) +static int l_hashfloat (lua_Number n) { + int i; + lua_Integer ni; + n = l_mathop(frexp)(n, &i) * -cast_num(INT_MIN); + if (!lua_numbertointeger(n, &ni)) { /* is 'n' inf/-inf/NaN? */ + lua_assert(luai_numisnan(n) || l_mathop(fabs)(n) == cast_num(HUGE_VAL)); + return 0; + } + else { /* normal case */ + unsigned int u = cast_uint(i) + cast_uint(ni); + return cast_int(u <= cast_uint(INT_MAX) ? u : ~u); + } +} +#endif + + +/* +** returns the 'main' position of an element in a table (that is, +** the index of its hash value). +*/ +static Node *mainpositionTV (const Table *t, const TValue *key) { + switch (ttypetag(key)) { + case LUA_VNUMINT: { + lua_Integer i = ivalue(key); + return hashint(t, i); + } + case LUA_VNUMFLT: { + lua_Number n = fltvalue(key); + return hashmod(t, l_hashfloat(n)); + } + case LUA_VSHRSTR: { + TString *ts = tsvalue(key); + return hashstr(t, ts); + } + case LUA_VLNGSTR: { + TString *ts = tsvalue(key); + return hashpow2(t, luaS_hashlongstr(ts)); + } + case LUA_VFALSE: + return hashboolean(t, 0); + case LUA_VTRUE: + return hashboolean(t, 1); + case LUA_VLIGHTUSERDATA: { + void *p = pvalue(key); + return hashpointer(t, p); + } + case LUA_VLCF: { + lua_CFunction f = fvalue(key); + return hashpointer(t, f); + } + default: { + GCObject *o = gcvalue(key); + return hashpointer(t, o); + } + } +} + + +l_sinline Node *mainpositionfromnode (const Table *t, Node *nd) { + TValue key; + getnodekey(cast(lua_State *, NULL), &key, nd); + return mainpositionTV(t, &key); +} + + +/* +** Check whether key 'k1' is equal to the key in node 'n2'. This +** equality is raw, so there are no metamethods. Floats with integer +** values have been normalized, so integers cannot be equal to +** floats. It is assumed that 'eqshrstr' is simply pointer equality, so +** that short strings are handled in the default case. +** A true 'deadok' means to accept dead keys as equal to their original +** values. All dead keys are compared in the default case, by pointer +** identity. (Only collectable objects can produce dead keys.) Note that +** dead long strings are also compared by identity. +** Once a key is dead, its corresponding value may be collected, and +** then another value can be created with the same address. If this +** other value is given to 'next', 'equalkey' will signal a false +** positive. In a regular traversal, this situation should never happen, +** as all keys given to 'next' came from the table itself, and therefore +** could not have been collected. Outside a regular traversal, we +** have garbage in, garbage out. What is relevant is that this false +** positive does not break anything. (In particular, 'next' will return +** some other valid item on the table or nil.) +*/ +static int equalkey (const TValue *k1, const Node *n2, int deadok) { + if ((rawtt(k1) != keytt(n2)) && /* not the same variants? */ + !(deadok && keyisdead(n2) && iscollectable(k1))) + return 0; /* cannot be same key */ + switch (keytt(n2)) { + case LUA_VNIL: case LUA_VFALSE: case LUA_VTRUE: + return 1; + case LUA_VNUMINT: + return (ivalue(k1) == keyival(n2)); + case LUA_VNUMFLT: + return luai_numeq(fltvalue(k1), fltvalueraw(keyval(n2))); + case LUA_VLIGHTUSERDATA: + return pvalue(k1) == pvalueraw(keyval(n2)); + case LUA_VLCF: + return fvalue(k1) == fvalueraw(keyval(n2)); + case ctb(LUA_VLNGSTR): + return luaS_eqlngstr(tsvalue(k1), keystrval(n2)); + default: + return gcvalue(k1) == gcvalueraw(keyval(n2)); + } +} + + +/* +** True if value of 'alimit' is equal to the real size of the array +** part of table 't'. (Otherwise, the array part must be larger than +** 'alimit'.) +*/ +#define limitequalsasize(t) (isrealasize(t) || ispow2((t)->alimit)) + + +/* +** Returns the real size of the 'array' array +*/ +LUAI_FUNC unsigned int luaH_realasize (const Table *t) { + if (limitequalsasize(t)) + return t->alimit; /* this is the size */ + else { + unsigned int size = t->alimit; + /* compute the smallest power of 2 not smaller than 'n' */ + size |= (size >> 1); + size |= (size >> 2); + size |= (size >> 4); + size |= (size >> 8); +#if (UINT_MAX >> 14) > 3 /* unsigned int has more than 16 bits */ + size |= (size >> 16); +#if (UINT_MAX >> 30) > 3 + size |= (size >> 32); /* unsigned int has more than 32 bits */ +#endif +#endif + size++; + lua_assert(ispow2(size) && size/2 < t->alimit && t->alimit < size); + return size; + } +} + + +/* +** Check whether real size of the array is a power of 2. +** (If it is not, 'alimit' cannot be changed to any other value +** without changing the real size.) +*/ +static int ispow2realasize (const Table *t) { + return (!isrealasize(t) || ispow2(t->alimit)); +} + + +static unsigned int setlimittosize (Table *t) { + t->alimit = luaH_realasize(t); + setrealasize(t); + return t->alimit; +} + + +#define limitasasize(t) check_exp(isrealasize(t), t->alimit) + + + +/* +** "Generic" get version. (Not that generic: not valid for integers, +** which may be in array part, nor for floats with integral values.) +** See explanation about 'deadok' in function 'equalkey'. +*/ +static const TValue *getgeneric (Table *t, const TValue *key, int deadok) { + Node *n = mainpositionTV(t, key); + for (;;) { /* check whether 'key' is somewhere in the chain */ + if (equalkey(key, n, deadok)) + return gval(n); /* that's it */ + else { + int nx = gnext(n); + if (nx == 0) + return &absentkey; /* not found */ + n += nx; + } + } +} + + +/* +** returns the index for 'k' if 'k' is an appropriate key to live in +** the array part of a table, 0 otherwise. +*/ +static unsigned int arrayindex (lua_Integer k) { + if (l_castS2U(k) - 1u < MAXASIZE) /* 'k' in [1, MAXASIZE]? */ + return cast_uint(k); /* 'key' is an appropriate array index */ + else + return 0; +} + + +/* +** returns the index of a 'key' for table traversals. First goes all +** elements in the array part, then elements in the hash part. The +** beginning of a traversal is signaled by 0. +*/ +static unsigned int findindex (lua_State *L, Table *t, TValue *key, + unsigned int asize) { + unsigned int i; + if (ttisnil(key)) return 0; /* first iteration */ + i = ttisinteger(key) ? arrayindex(ivalue(key)) : 0; + if (i - 1u < asize) /* is 'key' inside array part? */ + return i; /* yes; that's the index */ + else { + const TValue *n = getgeneric(t, key, 1); + if (l_unlikely(isabstkey(n))) + luaG_runerror(L, "invalid key to 'next'"); /* key not found */ + i = cast_int(nodefromval(n) - gnode(t, 0)); /* key index in hash table */ + /* hash elements are numbered after array ones */ + return (i + 1) + asize; + } +} + + +int luaH_next (lua_State *L, Table *t, StkId key) { + unsigned int asize = luaH_realasize(t); + unsigned int i = findindex(L, t, s2v(key), asize); /* find original key */ + for (; i < asize; i++) { /* try first array part */ + if (!isempty(&t->array[i])) { /* a non-empty entry? */ + setivalue(s2v(key), i + 1); + setobj2s(L, key + 1, &t->array[i]); + return 1; + } + } + for (i -= asize; cast_int(i) < sizenode(t); i++) { /* hash part */ + if (!isempty(gval(gnode(t, i)))) { /* a non-empty entry? */ + Node *n = gnode(t, i); + getnodekey(L, s2v(key), n); + setobj2s(L, key + 1, gval(n)); + return 1; + } + } + return 0; /* no more elements */ +} + + +static void freehash (lua_State *L, Table *t) { + if (!isdummy(t)) + luaM_freearray(L, t->node, cast_sizet(sizenode(t))); +} + + +/* +** {============================================================= +** Rehash +** ============================================================== +*/ + +/* +** Compute the optimal size for the array part of table 't'. 'nums' is a +** "count array" where 'nums[i]' is the number of integers in the table +** between 2^(i - 1) + 1 and 2^i. 'pna' enters with the total number of +** integer keys in the table and leaves with the number of keys that +** will go to the array part; return the optimal size. (The condition +** 'twotoi > 0' in the for loop stops the loop if 'twotoi' overflows.) +*/ +static unsigned int computesizes (unsigned int nums[], unsigned int *pna) { + int i; + unsigned int twotoi; /* 2^i (candidate for optimal size) */ + unsigned int a = 0; /* number of elements smaller than 2^i */ + unsigned int na = 0; /* number of elements to go to array part */ + unsigned int optimal = 0; /* optimal size for array part */ + /* loop while keys can fill more than half of total size */ + for (i = 0, twotoi = 1; + twotoi > 0 && *pna > twotoi / 2; + i++, twotoi *= 2) { + a += nums[i]; + if (a > twotoi/2) { /* more than half elements present? */ + optimal = twotoi; /* optimal size (till now) */ + na = a; /* all elements up to 'optimal' will go to array part */ + } + } + lua_assert((optimal == 0 || optimal / 2 < na) && na <= optimal); + *pna = na; + return optimal; +} + + +static int countint (lua_Integer key, unsigned int *nums) { + unsigned int k = arrayindex(key); + if (k != 0) { /* is 'key' an appropriate array index? */ + nums[luaO_ceillog2(k)]++; /* count as such */ + return 1; + } + else + return 0; +} + + +/* +** Count keys in array part of table 't': Fill 'nums[i]' with +** number of keys that will go into corresponding slice and return +** total number of non-nil keys. +*/ +static unsigned int numusearray (const Table *t, unsigned int *nums) { + int lg; + unsigned int ttlg; /* 2^lg */ + unsigned int ause = 0; /* summation of 'nums' */ + unsigned int i = 1; /* count to traverse all array keys */ + unsigned int asize = limitasasize(t); /* real array size */ + /* traverse each slice */ + for (lg = 0, ttlg = 1; lg <= MAXABITS; lg++, ttlg *= 2) { + unsigned int lc = 0; /* counter */ + unsigned int lim = ttlg; + if (lim > asize) { + lim = asize; /* adjust upper limit */ + if (i > lim) + break; /* no more elements to count */ + } + /* count elements in range (2^(lg - 1), 2^lg] */ + for (; i <= lim; i++) { + if (!isempty(&t->array[i-1])) + lc++; + } + nums[lg] += lc; + ause += lc; + } + return ause; +} + + +static int numusehash (const Table *t, unsigned int *nums, unsigned int *pna) { + int totaluse = 0; /* total number of elements */ + int ause = 0; /* elements added to 'nums' (can go to array part) */ + int i = sizenode(t); + while (i--) { + Node *n = &t->node[i]; + if (!isempty(gval(n))) { + if (keyisinteger(n)) + ause += countint(keyival(n), nums); + totaluse++; + } + } + *pna += ause; + return totaluse; +} + + +/* +** Creates an array for the hash part of a table with the given +** size, or reuses the dummy node if size is zero. +** The computation for size overflow is in two steps: the first +** comparison ensures that the shift in the second one does not +** overflow. +*/ +static void setnodevector (lua_State *L, Table *t, unsigned int size) { + if (size == 0) { /* no elements to hash part? */ + t->node = cast(Node *, dummynode); /* use common 'dummynode' */ + t->lsizenode = 0; + t->lastfree = NULL; /* signal that it is using dummy node */ + } + else { + int i; + int lsize = luaO_ceillog2(size); + if (lsize > MAXHBITS || (1u << lsize) > MAXHSIZE) + luaG_runerror(L, "table overflow"); + size = twoto(lsize); + t->node = luaM_newvector(L, size, Node); + for (i = 0; i < cast_int(size); i++) { + Node *n = gnode(t, i); + gnext(n) = 0; + setnilkey(n); + setempty(gval(n)); + } + t->lsizenode = cast_byte(lsize); + t->lastfree = gnode(t, size); /* all positions are free */ + } +} + + +/* +** (Re)insert all elements from the hash part of 'ot' into table 't'. +*/ +static void reinsert (lua_State *L, Table *ot, Table *t) { + int j; + int size = sizenode(ot); + for (j = 0; j < size; j++) { + Node *old = gnode(ot, j); + if (!isempty(gval(old))) { + /* doesn't need barrier/invalidate cache, as entry was + already present in the table */ + TValue k; + getnodekey(L, &k, old); + luaH_set(L, t, &k, gval(old)); + } + } +} + + +/* +** Exchange the hash part of 't1' and 't2'. +*/ +static void exchangehashpart (Table *t1, Table *t2) { + lu_byte lsizenode = t1->lsizenode; + Node *node = t1->node; + Node *lastfree = t1->lastfree; + t1->lsizenode = t2->lsizenode; + t1->node = t2->node; + t1->lastfree = t2->lastfree; + t2->lsizenode = lsizenode; + t2->node = node; + t2->lastfree = lastfree; +} + + +/* +** Resize table 't' for the new given sizes. Both allocations (for +** the hash part and for the array part) can fail, which creates some +** subtleties. If the first allocation, for the hash part, fails, an +** error is raised and that is it. Otherwise, it copies the elements from +** the shrinking part of the array (if it is shrinking) into the new +** hash. Then it reallocates the array part. If that fails, the table +** is in its original state; the function frees the new hash part and then +** raises the allocation error. Otherwise, it sets the new hash part +** into the table, initializes the new part of the array (if any) with +** nils and reinserts the elements of the old hash back into the new +** parts of the table. +*/ +void luaH_resize (lua_State *L, Table *t, unsigned int newasize, + unsigned int nhsize) { + unsigned int i; + Table newt; /* to keep the new hash part */ + unsigned int oldasize = setlimittosize(t); + TValue *newarray; + /* create new hash part with appropriate size into 'newt' */ + setnodevector(L, &newt, nhsize); + if (newasize < oldasize) { /* will array shrink? */ + t->alimit = newasize; /* pretend array has new size... */ + exchangehashpart(t, &newt); /* and new hash */ + /* re-insert into the new hash the elements from vanishing slice */ + for (i = newasize; i < oldasize; i++) { + if (!isempty(&t->array[i])) + luaH_setint(L, t, i + 1, &t->array[i]); + } + t->alimit = oldasize; /* restore current size... */ + exchangehashpart(t, &newt); /* and hash (in case of errors) */ + } + /* allocate new array */ + newarray = luaM_reallocvector(L, t->array, oldasize, newasize, TValue); + if (l_unlikely(newarray == NULL && newasize > 0)) { /* allocation failed? */ + freehash(L, &newt); /* release new hash part */ + luaM_error(L); /* raise error (with array unchanged) */ + } + /* allocation ok; initialize new part of the array */ + exchangehashpart(t, &newt); /* 't' has the new hash ('newt' has the old) */ + t->array = newarray; /* set new array part */ + t->alimit = newasize; + for (i = oldasize; i < newasize; i++) /* clear new slice of the array */ + setempty(&t->array[i]); + /* re-insert elements from old hash part into new parts */ + reinsert(L, &newt, t); /* 'newt' now has the old hash */ + freehash(L, &newt); /* free old hash part */ +} + + +void luaH_resizearray (lua_State *L, Table *t, unsigned int nasize) { + int nsize = allocsizenode(t); + luaH_resize(L, t, nasize, nsize); +} + +/* +** nums[i] = number of keys 'k' where 2^(i - 1) < k <= 2^i +*/ +static void rehash (lua_State *L, Table *t, const TValue *ek) { + unsigned int asize; /* optimal size for array part */ + unsigned int na; /* number of keys in the array part */ + unsigned int nums[MAXABITS + 1]; + int i; + int totaluse; + for (i = 0; i <= MAXABITS; i++) nums[i] = 0; /* reset counts */ + setlimittosize(t); + na = numusearray(t, nums); /* count keys in array part */ + totaluse = na; /* all those keys are integer keys */ + totaluse += numusehash(t, nums, &na); /* count keys in hash part */ + /* count extra key */ + if (ttisinteger(ek)) + na += countint(ivalue(ek), nums); + totaluse++; + /* compute new size for array part */ + asize = computesizes(nums, &na); + /* resize the table to new computed sizes */ + luaH_resize(L, t, asize, totaluse - na); +} + + + +/* +** }============================================================= +*/ + + +Table *luaH_new (lua_State *L) { + GCObject *o = luaC_newobj(L, LUA_VTABLE, sizeof(Table)); + Table *t = gco2t(o); + t->metatable = NULL; + t->flags = cast_byte(maskflags); /* table has no metamethod fields */ + t->array = NULL; + t->alimit = 0; + setnodevector(L, t, 0); + return t; +} + + +void luaH_free (lua_State *L, Table *t) { + freehash(L, t); + luaM_freearray(L, t->array, luaH_realasize(t)); + luaM_free(L, t); +} + + +static Node *getfreepos (Table *t) { + if (!isdummy(t)) { + while (t->lastfree > t->node) { + t->lastfree--; + if (keyisnil(t->lastfree)) + return t->lastfree; + } + } + return NULL; /* could not find a free place */ +} + + + +/* +** inserts a new key into a hash table; first, check whether key's main +** position is free. If not, check whether colliding node is in its main +** position or not: if it is not, move colliding node to an empty place and +** put new key in its main position; otherwise (colliding node is in its main +** position), new key goes to an empty position. +*/ +void luaH_newkey (lua_State *L, Table *t, const TValue *key, TValue *value) { + Node *mp; + TValue aux; + if (l_unlikely(ttisnil(key))) + luaG_runerror(L, "table index is nil"); + else if (ttisfloat(key)) { + lua_Number f = fltvalue(key); + lua_Integer k; + if (luaV_flttointeger(f, &k, F2Ieq)) { /* does key fit in an integer? */ + setivalue(&aux, k); + key = &aux; /* insert it as an integer */ + } + else if (l_unlikely(luai_numisnan(f))) + luaG_runerror(L, "table index is NaN"); + } + if (ttisnil(value)) + return; /* do not insert nil values */ + mp = mainpositionTV(t, key); + if (!isempty(gval(mp)) || isdummy(t)) { /* main position is taken? */ + Node *othern; + Node *f = getfreepos(t); /* get a free place */ + if (f == NULL) { /* cannot find a free place? */ + rehash(L, t, key); /* grow table */ + /* whatever called 'newkey' takes care of TM cache */ + luaH_set(L, t, key, value); /* insert key into grown table */ + return; + } + lua_assert(!isdummy(t)); + othern = mainpositionfromnode(t, mp); + if (othern != mp) { /* is colliding node out of its main position? */ + /* yes; move colliding node into free position */ + while (othern + gnext(othern) != mp) /* find previous */ + othern += gnext(othern); + gnext(othern) = cast_int(f - othern); /* rechain to point to 'f' */ + *f = *mp; /* copy colliding node into free pos. (mp->next also goes) */ + if (gnext(mp) != 0) { + gnext(f) += cast_int(mp - f); /* correct 'next' */ + gnext(mp) = 0; /* now 'mp' is free */ + } + setempty(gval(mp)); + } + else { /* colliding node is in its own main position */ + /* new node will go into free position */ + if (gnext(mp) != 0) + gnext(f) = cast_int((mp + gnext(mp)) - f); /* chain new position */ + else lua_assert(gnext(f) == 0); + gnext(mp) = cast_int(f - mp); + mp = f; + } + } + setnodekey(L, mp, key); + luaC_barrierback(L, obj2gco(t), key); + lua_assert(isempty(gval(mp))); + setobj2t(L, gval(mp), value); +} + + +/* +** Search function for integers. If integer is inside 'alimit', get it +** directly from the array part. Otherwise, if 'alimit' is not equal to +** the real size of the array, key still can be in the array part. In +** this case, try to avoid a call to 'luaH_realasize' when key is just +** one more than the limit (so that it can be incremented without +** changing the real size of the array). +*/ +const TValue *luaH_getint (Table *t, lua_Integer key) { + if (l_castS2U(key) - 1u < t->alimit) /* 'key' in [1, t->alimit]? */ + return &t->array[key - 1]; + else if (!limitequalsasize(t) && /* key still may be in the array part? */ + (l_castS2U(key) == t->alimit + 1 || + l_castS2U(key) - 1u < luaH_realasize(t))) { + t->alimit = cast_uint(key); /* probably '#t' is here now */ + return &t->array[key - 1]; + } + else { + Node *n = hashint(t, key); + for (;;) { /* check whether 'key' is somewhere in the chain */ + if (keyisinteger(n) && keyival(n) == key) + return gval(n); /* that's it */ + else { + int nx = gnext(n); + if (nx == 0) break; + n += nx; + } + } + return &absentkey; + } +} + + +/* +** search function for short strings +*/ +const TValue *luaH_getshortstr (Table *t, TString *key) { + Node *n = hashstr(t, key); + lua_assert(key->tt == LUA_VSHRSTR); + for (;;) { /* check whether 'key' is somewhere in the chain */ + if (keyisshrstr(n) && eqshrstr(keystrval(n), key)) + return gval(n); /* that's it */ + else { + int nx = gnext(n); + if (nx == 0) + return &absentkey; /* not found */ + n += nx; + } + } +} + + +const TValue *luaH_getstr (Table *t, TString *key) { + if (key->tt == LUA_VSHRSTR) + return luaH_getshortstr(t, key); + else { /* for long strings, use generic case */ + TValue ko; + setsvalue(cast(lua_State *, NULL), &ko, key); + return getgeneric(t, &ko, 0); + } +} + + +/* +** main search function +*/ +const TValue *luaH_get (Table *t, const TValue *key) { + switch (ttypetag(key)) { + case LUA_VSHRSTR: return luaH_getshortstr(t, tsvalue(key)); + case LUA_VNUMINT: return luaH_getint(t, ivalue(key)); + case LUA_VNIL: return &absentkey; + case LUA_VNUMFLT: { + lua_Integer k; + if (luaV_flttointeger(fltvalue(key), &k, F2Ieq)) /* integral index? */ + return luaH_getint(t, k); /* use specialized version */ + /* else... */ + } /* FALLTHROUGH */ + default: + return getgeneric(t, key, 0); + } +} + + +/* +** Finish a raw "set table" operation, where 'slot' is where the value +** should have been (the result of a previous "get table"). +** Beware: when using this function you probably need to check a GC +** barrier and invalidate the TM cache. +*/ +void luaH_finishset (lua_State *L, Table *t, const TValue *key, + const TValue *slot, TValue *value) { + if (isabstkey(slot)) + luaH_newkey(L, t, key, value); + else + setobj2t(L, cast(TValue *, slot), value); +} + + +/* +** beware: when using this function you probably need to check a GC +** barrier and invalidate the TM cache. +*/ +void luaH_set (lua_State *L, Table *t, const TValue *key, TValue *value) { + const TValue *slot = luaH_get(t, key); + luaH_finishset(L, t, key, slot, value); +} + + +void luaH_setint (lua_State *L, Table *t, lua_Integer key, TValue *value) { + const TValue *p = luaH_getint(t, key); + if (isabstkey(p)) { + TValue k; + setivalue(&k, key); + luaH_newkey(L, t, &k, value); + } + else + setobj2t(L, cast(TValue *, p), value); +} + + +/* +** Try to find a boundary in the hash part of table 't'. From the +** caller, we know that 'j' is zero or present and that 'j + 1' is +** present. We want to find a larger key that is absent from the +** table, so that we can do a binary search between the two keys to +** find a boundary. We keep doubling 'j' until we get an absent index. +** If the doubling would overflow, we try LUA_MAXINTEGER. If it is +** absent, we are ready for the binary search. ('j', being max integer, +** is larger or equal to 'i', but it cannot be equal because it is +** absent while 'i' is present; so 'j > i'.) Otherwise, 'j' is a +** boundary. ('j + 1' cannot be a present integer key because it is +** not a valid integer in Lua.) +*/ +static lua_Unsigned hash_search (Table *t, lua_Unsigned j) { + lua_Unsigned i; + if (j == 0) j++; /* the caller ensures 'j + 1' is present */ + do { + i = j; /* 'i' is a present index */ + if (j <= l_castS2U(LUA_MAXINTEGER) / 2) + j *= 2; + else { + j = LUA_MAXINTEGER; + if (isempty(luaH_getint(t, j))) /* t[j] not present? */ + break; /* 'j' now is an absent index */ + else /* weird case */ + return j; /* well, max integer is a boundary... */ + } + } while (!isempty(luaH_getint(t, j))); /* repeat until an absent t[j] */ + /* i < j && t[i] present && t[j] absent */ + while (j - i > 1u) { /* do a binary search between them */ + lua_Unsigned m = (i + j) / 2; + if (isempty(luaH_getint(t, m))) j = m; + else i = m; + } + return i; +} + + +static unsigned int binsearch (const TValue *array, unsigned int i, + unsigned int j) { + while (j - i > 1u) { /* binary search */ + unsigned int m = (i + j) / 2; + if (isempty(&array[m - 1])) j = m; + else i = m; + } + return i; +} + + +/* +** Try to find a boundary in table 't'. (A 'boundary' is an integer index +** such that t[i] is present and t[i+1] is absent, or 0 if t[1] is absent +** and 'maxinteger' if t[maxinteger] is present.) +** (In the next explanation, we use Lua indices, that is, with base 1. +** The code itself uses base 0 when indexing the array part of the table.) +** The code starts with 'limit = t->alimit', a position in the array +** part that may be a boundary. +** +** (1) If 't[limit]' is empty, there must be a boundary before it. +** As a common case (e.g., after 't[#t]=nil'), check whether 'limit-1' +** is present. If so, it is a boundary. Otherwise, do a binary search +** between 0 and limit to find a boundary. In both cases, try to +** use this boundary as the new 'alimit', as a hint for the next call. +** +** (2) If 't[limit]' is not empty and the array has more elements +** after 'limit', try to find a boundary there. Again, try first +** the special case (which should be quite frequent) where 'limit+1' +** is empty, so that 'limit' is a boundary. Otherwise, check the +** last element of the array part. If it is empty, there must be a +** boundary between the old limit (present) and the last element +** (absent), which is found with a binary search. (This boundary always +** can be a new limit.) +** +** (3) The last case is when there are no elements in the array part +** (limit == 0) or its last element (the new limit) is present. +** In this case, must check the hash part. If there is no hash part +** or 'limit+1' is absent, 'limit' is a boundary. Otherwise, call +** 'hash_search' to find a boundary in the hash part of the table. +** (In those cases, the boundary is not inside the array part, and +** therefore cannot be used as a new limit.) +*/ +lua_Unsigned luaH_getn (Table *t) { + unsigned int limit = t->alimit; + if (limit > 0 && isempty(&t->array[limit - 1])) { /* (1)? */ + /* there must be a boundary before 'limit' */ + if (limit >= 2 && !isempty(&t->array[limit - 2])) { + /* 'limit - 1' is a boundary; can it be a new limit? */ + if (ispow2realasize(t) && !ispow2(limit - 1)) { + t->alimit = limit - 1; + setnorealasize(t); /* now 'alimit' is not the real size */ + } + return limit - 1; + } + else { /* must search for a boundary in [0, limit] */ + unsigned int boundary = binsearch(t->array, 0, limit); + /* can this boundary represent the real size of the array? */ + if (ispow2realasize(t) && boundary > luaH_realasize(t) / 2) { + t->alimit = boundary; /* use it as the new limit */ + setnorealasize(t); + } + return boundary; + } + } + /* 'limit' is zero or present in table */ + if (!limitequalsasize(t)) { /* (2)? */ + /* 'limit' > 0 and array has more elements after 'limit' */ + if (isempty(&t->array[limit])) /* 'limit + 1' is empty? */ + return limit; /* this is the boundary */ + /* else, try last element in the array */ + limit = luaH_realasize(t); + if (isempty(&t->array[limit - 1])) { /* empty? */ + /* there must be a boundary in the array after old limit, + and it must be a valid new limit */ + unsigned int boundary = binsearch(t->array, t->alimit, limit); + t->alimit = boundary; + return boundary; + } + /* else, new limit is present in the table; check the hash part */ + } + /* (3) 'limit' is the last element and either is zero or present in table */ + lua_assert(limit == luaH_realasize(t) && + (limit == 0 || !isempty(&t->array[limit - 1]))); + if (isdummy(t) || isempty(luaH_getint(t, cast(lua_Integer, limit + 1)))) + return limit; /* 'limit + 1' is absent */ + else /* 'limit + 1' is also present */ + return hash_search(t, limit); +} + + + +#if defined(LUA_DEBUG) + +/* export these functions for the test library */ + +Node *luaH_mainposition (const Table *t, const TValue *key) { + return mainpositionTV(t, key); +} + +#endif diff --git a/06/lua-5.4.6/src/ltable.h b/06/lua-5.4.6/src/ltable.h new file mode 100644 index 0000000..75dd9e2 --- /dev/null +++ b/06/lua-5.4.6/src/ltable.h @@ -0,0 +1,65 @@ +/* +** $Id: ltable.h $ +** Lua tables (hash) +** See Copyright Notice in lua.h +*/ + +#ifndef ltable_h +#define ltable_h + +#include "lobject.h" + + +#define gnode(t,i) (&(t)->node[i]) +#define gval(n) (&(n)->i_val) +#define gnext(n) ((n)->u.next) + + +/* +** Clear all bits of fast-access metamethods, which means that the table +** may have any of these metamethods. (First access that fails after the +** clearing will set the bit again.) +*/ +#define invalidateTMcache(t) ((t)->flags &= ~maskflags) + + +/* true when 't' is using 'dummynode' as its hash part */ +#define isdummy(t) ((t)->lastfree == NULL) + + +/* allocated size for hash nodes */ +#define allocsizenode(t) (isdummy(t) ? 0 : sizenode(t)) + + +/* returns the Node, given the value of a table entry */ +#define nodefromval(v) cast(Node *, (v)) + + +LUAI_FUNC const TValue *luaH_getint (Table *t, lua_Integer key); +LUAI_FUNC void luaH_setint (lua_State *L, Table *t, lua_Integer key, + TValue *value); +LUAI_FUNC const TValue *luaH_getshortstr (Table *t, TString *key); +LUAI_FUNC const TValue *luaH_getstr (Table *t, TString *key); +LUAI_FUNC const TValue *luaH_get (Table *t, const TValue *key); +LUAI_FUNC void luaH_newkey (lua_State *L, Table *t, const TValue *key, + TValue *value); +LUAI_FUNC void luaH_set (lua_State *L, Table *t, const TValue *key, + TValue *value); +LUAI_FUNC void luaH_finishset (lua_State *L, Table *t, const TValue *key, + const TValue *slot, TValue *value); +LUAI_FUNC Table *luaH_new (lua_State *L); +LUAI_FUNC void luaH_resize (lua_State *L, Table *t, unsigned int nasize, + unsigned int nhsize); +LUAI_FUNC void luaH_resizearray (lua_State *L, Table *t, unsigned int nasize); +LUAI_FUNC void luaH_free (lua_State *L, Table *t); +LUAI_FUNC int luaH_next (lua_State *L, Table *t, StkId key); +LUAI_FUNC lua_Unsigned luaH_getn (Table *t); +LUAI_FUNC unsigned int luaH_realasize (const Table *t); + + +#if defined(LUA_DEBUG) +LUAI_FUNC Node *luaH_mainposition (const Table *t, const TValue *key); +#endif + + +#endif diff --git a/06/lua-5.4.6/src/ltablib.c b/06/lua-5.4.6/src/ltablib.c new file mode 100644 index 0000000..e6bc4d0 --- /dev/null +++ b/06/lua-5.4.6/src/ltablib.c @@ -0,0 +1,430 @@ +/* +** $Id: ltablib.c $ +** Library for Table Manipulation +** See Copyright Notice in lua.h +*/ + +#define ltablib_c +#define LUA_LIB + +#include "lprefix.h" + + +#include +#include +#include + +#include "lua.h" + +#include "lauxlib.h" +#include "lualib.h" + + +/* +** Operations that an object must define to mimic a table +** (some functions only need some of them) +*/ +#define TAB_R 1 /* read */ +#define TAB_W 2 /* write */ +#define TAB_L 4 /* length */ +#define TAB_RW (TAB_R | TAB_W) /* read/write */ + + +#define aux_getn(L,n,w) (checktab(L, n, (w) | TAB_L), luaL_len(L, n)) + + +static int checkfield (lua_State *L, const char *key, int n) { + lua_pushstring(L, key); + return (lua_rawget(L, -n) != LUA_TNIL); +} + + +/* +** Check that 'arg' either is a table or can behave like one (that is, +** has a metatable with the required metamethods) +*/ +static void checktab (lua_State *L, int arg, int what) { + if (lua_type(L, arg) != LUA_TTABLE) { /* is it not a table? */ + int n = 1; /* number of elements to pop */ + if (lua_getmetatable(L, arg) && /* must have metatable */ + (!(what & TAB_R) || checkfield(L, "__index", ++n)) && + (!(what & TAB_W) || checkfield(L, "__newindex", ++n)) && + (!(what & TAB_L) || checkfield(L, "__len", ++n))) { + lua_pop(L, n); /* pop metatable and tested metamethods */ + } + else + luaL_checktype(L, arg, LUA_TTABLE); /* force an error */ + } +} + + +static int tinsert (lua_State *L) { + lua_Integer pos; /* where to insert new element */ + lua_Integer e = aux_getn(L, 1, TAB_RW); + e = luaL_intop(+, e, 1); /* first empty element */ + switch (lua_gettop(L)) { + case 2: { /* called with only 2 arguments */ + pos = e; /* insert new element at the end */ + break; + } + case 3: { + lua_Integer i; + pos = luaL_checkinteger(L, 2); /* 2nd argument is the position */ + /* check whether 'pos' is in [1, e] */ + luaL_argcheck(L, (lua_Unsigned)pos - 1u < (lua_Unsigned)e, 2, + "position out of bounds"); + for (i = e; i > pos; i--) { /* move up elements */ + lua_geti(L, 1, i - 1); + lua_seti(L, 1, i); /* t[i] = t[i - 1] */ + } + break; + } + default: { + return luaL_error(L, "wrong number of arguments to 'insert'"); + } + } + lua_seti(L, 1, pos); /* t[pos] = v */ + return 0; +} + + +static int tremove (lua_State *L) { + lua_Integer size = aux_getn(L, 1, TAB_RW); + lua_Integer pos = luaL_optinteger(L, 2, size); + if (pos != size) /* validate 'pos' if given */ + /* check whether 'pos' is in [1, size + 1] */ + luaL_argcheck(L, (lua_Unsigned)pos - 1u <= (lua_Unsigned)size, 2, + "position out of bounds"); + lua_geti(L, 1, pos); /* result = t[pos] */ + for ( ; pos < size; pos++) { + lua_geti(L, 1, pos + 1); + lua_seti(L, 1, pos); /* t[pos] = t[pos + 1] */ + } + lua_pushnil(L); + lua_seti(L, 1, pos); /* remove entry t[pos] */ + return 1; +} + + +/* +** Copy elements (1[f], ..., 1[e]) into (tt[t], tt[t+1], ...). Whenever +** possible, copy in increasing order, which is better for rehashing. +** "possible" means destination after original range, or smaller +** than origin, or copying to another table. +*/ +static int tmove (lua_State *L) { + lua_Integer f = luaL_checkinteger(L, 2); + lua_Integer e = luaL_checkinteger(L, 3); + lua_Integer t = luaL_checkinteger(L, 4); + int tt = !lua_isnoneornil(L, 5) ? 5 : 1; /* destination table */ + checktab(L, 1, TAB_R); + checktab(L, tt, TAB_W); + if (e >= f) { /* otherwise, nothing to move */ + lua_Integer n, i; + luaL_argcheck(L, f > 0 || e < LUA_MAXINTEGER + f, 3, + "too many elements to move"); + n = e - f + 1; /* number of elements to move */ + luaL_argcheck(L, t <= LUA_MAXINTEGER - n + 1, 4, + "destination wrap around"); + if (t > e || t <= f || (tt != 1 && !lua_compare(L, 1, tt, LUA_OPEQ))) { + for (i = 0; i < n; i++) { + lua_geti(L, 1, f + i); + lua_seti(L, tt, t + i); + } + } + else { + for (i = n - 1; i >= 0; i--) { + lua_geti(L, 1, f + i); + lua_seti(L, tt, t + i); + } + } + } + lua_pushvalue(L, tt); /* return destination table */ + return 1; +} + + +static void addfield (lua_State *L, luaL_Buffer *b, lua_Integer i) { + lua_geti(L, 1, i); + if (l_unlikely(!lua_isstring(L, -1))) + luaL_error(L, "invalid value (%s) at index %I in table for 'concat'", + luaL_typename(L, -1), (LUAI_UACINT)i); + luaL_addvalue(b); +} + + +static int tconcat (lua_State *L) { + luaL_Buffer b; + lua_Integer last = aux_getn(L, 1, TAB_R); + size_t lsep; + const char *sep = luaL_optlstring(L, 2, "", &lsep); + lua_Integer i = luaL_optinteger(L, 3, 1); + last = luaL_optinteger(L, 4, last); + luaL_buffinit(L, &b); + for (; i < last; i++) { + addfield(L, &b, i); + luaL_addlstring(&b, sep, lsep); + } + if (i == last) /* add last value (if interval was not empty) */ + addfield(L, &b, i); + luaL_pushresult(&b); + return 1; +} + + +/* +** {====================================================== +** Pack/unpack +** ======================================================= +*/ + +static int tpack (lua_State *L) { + int i; + int n = lua_gettop(L); /* number of elements to pack */ + lua_createtable(L, n, 1); /* create result table */ + lua_insert(L, 1); /* put it at index 1 */ + for (i = n; i >= 1; i--) /* assign elements */ + lua_seti(L, 1, i); + lua_pushinteger(L, n); + lua_setfield(L, 1, "n"); /* t.n = number of elements */ + return 1; /* return table */ +} + + +static int tunpack (lua_State *L) { + lua_Unsigned n; + lua_Integer i = luaL_optinteger(L, 2, 1); + lua_Integer e = luaL_opt(L, luaL_checkinteger, 3, luaL_len(L, 1)); + if (i > e) return 0; /* empty range */ + n = (lua_Unsigned)e - i; /* number of elements minus 1 (avoid overflows) */ + if (l_unlikely(n >= (unsigned int)INT_MAX || + !lua_checkstack(L, (int)(++n)))) + return luaL_error(L, "too many results to unpack"); + for (; i < e; i++) { /* push arg[i..e - 1] (to avoid overflows) */ + lua_geti(L, 1, i); + } + lua_geti(L, 1, e); /* push last element */ + return (int)n; +} + +/* }====================================================== */ + + + +/* +** {====================================================== +** Quicksort +** (based on 'Algorithms in MODULA-3', Robert Sedgewick; +** Addison-Wesley, 1993.) +** ======================================================= +*/ + + +/* type for array indices */ +typedef unsigned int IdxT; + + +/* +** Produce a "random" 'unsigned int' to randomize pivot choice. This +** macro is used only when 'sort' detects a big imbalance in the result +** of a partition. (If you don't want/need this "randomness", ~0 is a +** good choice.) +*/ +#if !defined(l_randomizePivot) /* { */ + +#include + +/* size of 'e' measured in number of 'unsigned int's */ +#define sof(e) (sizeof(e) / sizeof(unsigned int)) + +/* +** Use 'time' and 'clock' as sources of "randomness". Because we don't +** know the types 'clock_t' and 'time_t', we cannot cast them to +** anything without risking overflows. A safe way to use their values +** is to copy them to an array of a known type and use the array values. +*/ +static unsigned int l_randomizePivot (void) { + clock_t c = clock(); + time_t t = time(NULL); + unsigned int buff[sof(c) + sof(t)]; + unsigned int i, rnd = 0; + memcpy(buff, &c, sof(c) * sizeof(unsigned int)); + memcpy(buff + sof(c), &t, sof(t) * sizeof(unsigned int)); + for (i = 0; i < sof(buff); i++) + rnd += buff[i]; + return rnd; +} + +#endif /* } */ + + +/* arrays larger than 'RANLIMIT' may use randomized pivots */ +#define RANLIMIT 100u + + +static void set2 (lua_State *L, IdxT i, IdxT j) { + lua_seti(L, 1, i); + lua_seti(L, 1, j); +} + + +/* +** Return true iff value at stack index 'a' is less than the value at +** index 'b' (according to the order of the sort). +*/ +static int sort_comp (lua_State *L, int a, int b) { + if (lua_isnil(L, 2)) /* no function? */ + return lua_compare(L, a, b, LUA_OPLT); /* a < b */ + else { /* function */ + int res; + lua_pushvalue(L, 2); /* push function */ + lua_pushvalue(L, a-1); /* -1 to compensate function */ + lua_pushvalue(L, b-2); /* -2 to compensate function and 'a' */ + lua_call(L, 2, 1); /* call function */ + res = lua_toboolean(L, -1); /* get result */ + lua_pop(L, 1); /* pop result */ + return res; + } +} + + +/* +** Does the partition: Pivot P is at the top of the stack. +** precondition: a[lo] <= P == a[up-1] <= a[up], +** so it only needs to do the partition from lo + 1 to up - 2. +** Pos-condition: a[lo .. i - 1] <= a[i] == P <= a[i + 1 .. up] +** returns 'i'. +*/ +static IdxT partition (lua_State *L, IdxT lo, IdxT up) { + IdxT i = lo; /* will be incremented before first use */ + IdxT j = up - 1; /* will be decremented before first use */ + /* loop invariant: a[lo .. i] <= P <= a[j .. up] */ + for (;;) { + /* next loop: repeat ++i while a[i] < P */ + while ((void)lua_geti(L, 1, ++i), sort_comp(L, -1, -2)) { + if (l_unlikely(i == up - 1)) /* a[i] < P but a[up - 1] == P ?? */ + luaL_error(L, "invalid order function for sorting"); + lua_pop(L, 1); /* remove a[i] */ + } + /* after the loop, a[i] >= P and a[lo .. i - 1] < P */ + /* next loop: repeat --j while P < a[j] */ + while ((void)lua_geti(L, 1, --j), sort_comp(L, -3, -1)) { + if (l_unlikely(j < i)) /* j < i but a[j] > P ?? */ + luaL_error(L, "invalid order function for sorting"); + lua_pop(L, 1); /* remove a[j] */ + } + /* after the loop, a[j] <= P and a[j + 1 .. up] >= P */ + if (j < i) { /* no elements out of place? */ + /* a[lo .. i - 1] <= P <= a[j + 1 .. i .. up] */ + lua_pop(L, 1); /* pop a[j] */ + /* swap pivot (a[up - 1]) with a[i] to satisfy pos-condition */ + set2(L, up - 1, i); + return i; + } + /* otherwise, swap a[i] - a[j] to restore invariant and repeat */ + set2(L, i, j); + } +} + + +/* +** Choose an element in the middle (2nd-3th quarters) of [lo,up] +** "randomized" by 'rnd' +*/ +static IdxT choosePivot (IdxT lo, IdxT up, unsigned int rnd) { + IdxT r4 = (up - lo) / 4; /* range/4 */ + IdxT p = rnd % (r4 * 2) + (lo + r4); + lua_assert(lo + r4 <= p && p <= up - r4); + return p; +} + + +/* +** Quicksort algorithm (recursive function) +*/ +static void auxsort (lua_State *L, IdxT lo, IdxT up, + unsigned int rnd) { + while (lo < up) { /* loop for tail recursion */ + IdxT p; /* Pivot index */ + IdxT n; /* to be used later */ + /* sort elements 'lo', 'p', and 'up' */ + lua_geti(L, 1, lo); + lua_geti(L, 1, up); + if (sort_comp(L, -1, -2)) /* a[up] < a[lo]? */ + set2(L, lo, up); /* swap a[lo] - a[up] */ + else + lua_pop(L, 2); /* remove both values */ + if (up - lo == 1) /* only 2 elements? */ + return; /* already sorted */ + if (up - lo < RANLIMIT || rnd == 0) /* small interval or no randomize? */ + p = (lo + up)/2; /* middle element is a good pivot */ + else /* for larger intervals, it is worth a random pivot */ + p = choosePivot(lo, up, rnd); + lua_geti(L, 1, p); + lua_geti(L, 1, lo); + if (sort_comp(L, -2, -1)) /* a[p] < a[lo]? */ + set2(L, p, lo); /* swap a[p] - a[lo] */ + else { + lua_pop(L, 1); /* remove a[lo] */ + lua_geti(L, 1, up); + if (sort_comp(L, -1, -2)) /* a[up] < a[p]? */ + set2(L, p, up); /* swap a[up] - a[p] */ + else + lua_pop(L, 2); + } + if (up - lo == 2) /* only 3 elements? */ + return; /* already sorted */ + lua_geti(L, 1, p); /* get middle element (Pivot) */ + lua_pushvalue(L, -1); /* push Pivot */ + lua_geti(L, 1, up - 1); /* push a[up - 1] */ + set2(L, p, up - 1); /* swap Pivot (a[p]) with a[up - 1] */ + p = partition(L, lo, up); + /* a[lo .. p - 1] <= a[p] == P <= a[p + 1 .. up] */ + if (p - lo < up - p) { /* lower interval is smaller? */ + auxsort(L, lo, p - 1, rnd); /* call recursively for lower interval */ + n = p - lo; /* size of smaller interval */ + lo = p + 1; /* tail call for [p + 1 .. up] (upper interval) */ + } + else { + auxsort(L, p + 1, up, rnd); /* call recursively for upper interval */ + n = up - p; /* size of smaller interval */ + up = p - 1; /* tail call for [lo .. p - 1] (lower interval) */ + } + if ((up - lo) / 128 > n) /* partition too imbalanced? */ + rnd = l_randomizePivot(); /* try a new randomization */ + } /* tail call auxsort(L, lo, up, rnd) */ +} + + +static int sort (lua_State *L) { + lua_Integer n = aux_getn(L, 1, TAB_RW); + if (n > 1) { /* non-trivial interval? */ + luaL_argcheck(L, n < INT_MAX, 1, "array too big"); + if (!lua_isnoneornil(L, 2)) /* is there a 2nd argument? */ + luaL_checktype(L, 2, LUA_TFUNCTION); /* must be a function */ + lua_settop(L, 2); /* make sure there are two arguments */ + auxsort(L, 1, (IdxT)n, 0); + } + return 0; +} + +/* }====================================================== */ + + +static const luaL_Reg tab_funcs[] = { + {"concat", tconcat}, + {"insert", tinsert}, + {"pack", tpack}, + {"unpack", tunpack}, + {"remove", tremove}, + {"move", tmove}, + {"sort", sort}, + {NULL, NULL} +}; + + +LUAMOD_API int luaopen_table (lua_State *L) { + luaL_newlib(L, tab_funcs); + return 1; +} + diff --git a/06/lua-5.4.6/src/ltm.c b/06/lua-5.4.6/src/ltm.c new file mode 100644 index 0000000..07a0608 --- /dev/null +++ b/06/lua-5.4.6/src/ltm.c @@ -0,0 +1,271 @@ +/* +** $Id: ltm.c $ +** Tag methods +** See Copyright Notice in lua.h +*/ + +#define ltm_c +#define LUA_CORE + +#include "lprefix.h" + + +#include + +#include "lua.h" + +#include "ldebug.h" +#include "ldo.h" +#include "lgc.h" +#include "lobject.h" +#include "lstate.h" +#include "lstring.h" +#include "ltable.h" +#include "ltm.h" +#include "lvm.h" + + +static const char udatatypename[] = "userdata"; + +LUAI_DDEF const char *const luaT_typenames_[LUA_TOTALTYPES] = { + "no value", + "nil", "boolean", udatatypename, "number", + "string", "table", "function", udatatypename, "thread", + "upvalue", "proto" /* these last cases are used for tests only */ +}; + + +void luaT_init (lua_State *L) { + static const char *const luaT_eventname[] = { /* ORDER TM */ + "__index", "__newindex", + "__gc", "__mode", "__len", "__eq", + "__add", "__sub", "__mul", "__mod", "__pow", + "__div", "__idiv", + "__band", "__bor", "__bxor", "__shl", "__shr", + "__unm", "__bnot", "__lt", "__le", + "__concat", "__call", "__close" + }; + int i; + for (i=0; itmname[i] = luaS_new(L, luaT_eventname[i]); + luaC_fix(L, obj2gco(G(L)->tmname[i])); /* never collect these names */ + } +} + + +/* +** function to be used with macro "fasttm": optimized for absence of +** tag methods +*/ +const TValue *luaT_gettm (Table *events, TMS event, TString *ename) { + const TValue *tm = luaH_getshortstr(events, ename); + lua_assert(event <= TM_EQ); + if (notm(tm)) { /* no tag method? */ + events->flags |= cast_byte(1u<metatable; + break; + case LUA_TUSERDATA: + mt = uvalue(o)->metatable; + break; + default: + mt = G(L)->mt[ttype(o)]; + } + return (mt ? luaH_getshortstr(mt, G(L)->tmname[event]) : &G(L)->nilvalue); +} + + +/* +** Return the name of the type of an object. For tables and userdata +** with metatable, use their '__name' metafield, if present. +*/ +const char *luaT_objtypename (lua_State *L, const TValue *o) { + Table *mt; + if ((ttistable(o) && (mt = hvalue(o)->metatable) != NULL) || + (ttisfulluserdata(o) && (mt = uvalue(o)->metatable) != NULL)) { + const TValue *name = luaH_getshortstr(mt, luaS_new(L, "__name")); + if (ttisstring(name)) /* is '__name' a string? */ + return getstr(tsvalue(name)); /* use it as type name */ + } + return ttypename(ttype(o)); /* else use standard type name */ +} + + +void luaT_callTM (lua_State *L, const TValue *f, const TValue *p1, + const TValue *p2, const TValue *p3) { + StkId func = L->top.p; + setobj2s(L, func, f); /* push function (assume EXTRA_STACK) */ + setobj2s(L, func + 1, p1); /* 1st argument */ + setobj2s(L, func + 2, p2); /* 2nd argument */ + setobj2s(L, func + 3, p3); /* 3rd argument */ + L->top.p = func + 4; + /* metamethod may yield only when called from Lua code */ + if (isLuacode(L->ci)) + luaD_call(L, func, 0); + else + luaD_callnoyield(L, func, 0); +} + + +void luaT_callTMres (lua_State *L, const TValue *f, const TValue *p1, + const TValue *p2, StkId res) { + ptrdiff_t result = savestack(L, res); + StkId func = L->top.p; + setobj2s(L, func, f); /* push function (assume EXTRA_STACK) */ + setobj2s(L, func + 1, p1); /* 1st argument */ + setobj2s(L, func + 2, p2); /* 2nd argument */ + L->top.p += 3; + /* metamethod may yield only when called from Lua code */ + if (isLuacode(L->ci)) + luaD_call(L, func, 1); + else + luaD_callnoyield(L, func, 1); + res = restorestack(L, result); + setobjs2s(L, res, --L->top.p); /* move result to its place */ +} + + +static int callbinTM (lua_State *L, const TValue *p1, const TValue *p2, + StkId res, TMS event) { + const TValue *tm = luaT_gettmbyobj(L, p1, event); /* try first operand */ + if (notm(tm)) + tm = luaT_gettmbyobj(L, p2, event); /* try second operand */ + if (notm(tm)) return 0; + luaT_callTMres(L, tm, p1, p2, res); + return 1; +} + + +void luaT_trybinTM (lua_State *L, const TValue *p1, const TValue *p2, + StkId res, TMS event) { + if (l_unlikely(!callbinTM(L, p1, p2, res, event))) { + switch (event) { + case TM_BAND: case TM_BOR: case TM_BXOR: + case TM_SHL: case TM_SHR: case TM_BNOT: { + if (ttisnumber(p1) && ttisnumber(p2)) + luaG_tointerror(L, p1, p2); + else + luaG_opinterror(L, p1, p2, "perform bitwise operation on"); + } + /* calls never return, but to avoid warnings: *//* FALLTHROUGH */ + default: + luaG_opinterror(L, p1, p2, "perform arithmetic on"); + } + } +} + + +void luaT_tryconcatTM (lua_State *L) { + StkId top = L->top.p; + if (l_unlikely(!callbinTM(L, s2v(top - 2), s2v(top - 1), top - 2, + TM_CONCAT))) + luaG_concaterror(L, s2v(top - 2), s2v(top - 1)); +} + + +void luaT_trybinassocTM (lua_State *L, const TValue *p1, const TValue *p2, + int flip, StkId res, TMS event) { + if (flip) + luaT_trybinTM(L, p2, p1, res, event); + else + luaT_trybinTM(L, p1, p2, res, event); +} + + +void luaT_trybiniTM (lua_State *L, const TValue *p1, lua_Integer i2, + int flip, StkId res, TMS event) { + TValue aux; + setivalue(&aux, i2); + luaT_trybinassocTM(L, p1, &aux, flip, res, event); +} + + +/* +** Calls an order tag method. +** For lessequal, LUA_COMPAT_LT_LE keeps compatibility with old +** behavior: if there is no '__le', try '__lt', based on l <= r iff +** !(r < l) (assuming a total order). If the metamethod yields during +** this substitution, the continuation has to know about it (to negate +** the result of rtop.p, event)) /* try original event */ + return !l_isfalse(s2v(L->top.p)); +#if defined(LUA_COMPAT_LT_LE) + else if (event == TM_LE) { + /* try '!(p2 < p1)' for '(p1 <= p2)' */ + L->ci->callstatus |= CIST_LEQ; /* mark it is doing 'lt' for 'le' */ + if (callbinTM(L, p2, p1, L->top.p, TM_LT)) { + L->ci->callstatus ^= CIST_LEQ; /* clear mark */ + return l_isfalse(s2v(L->top.p)); + } + /* else error will remove this 'ci'; no need to clear mark */ + } +#endif + luaG_ordererror(L, p1, p2); /* no metamethod found */ + return 0; /* to avoid warnings */ +} + + +int luaT_callorderiTM (lua_State *L, const TValue *p1, int v2, + int flip, int isfloat, TMS event) { + TValue aux; const TValue *p2; + if (isfloat) { + setfltvalue(&aux, cast_num(v2)); + } + else + setivalue(&aux, v2); + if (flip) { /* arguments were exchanged? */ + p2 = p1; p1 = &aux; /* correct them */ + } + else + p2 = &aux; + return luaT_callorderTM(L, p1, p2, event); +} + + +void luaT_adjustvarargs (lua_State *L, int nfixparams, CallInfo *ci, + const Proto *p) { + int i; + int actual = cast_int(L->top.p - ci->func.p) - 1; /* number of arguments */ + int nextra = actual - nfixparams; /* number of extra arguments */ + ci->u.l.nextraargs = nextra; + luaD_checkstack(L, p->maxstacksize + 1); + /* copy function to the top of the stack */ + setobjs2s(L, L->top.p++, ci->func.p); + /* move fixed parameters to the top of the stack */ + for (i = 1; i <= nfixparams; i++) { + setobjs2s(L, L->top.p++, ci->func.p + i); + setnilvalue(s2v(ci->func.p + i)); /* erase original parameter (for GC) */ + } + ci->func.p += actual + 1; + ci->top.p += actual + 1; + lua_assert(L->top.p <= ci->top.p && ci->top.p <= L->stack_last.p); +} + + +void luaT_getvarargs (lua_State *L, CallInfo *ci, StkId where, int wanted) { + int i; + int nextra = ci->u.l.nextraargs; + if (wanted < 0) { + wanted = nextra; /* get all extra arguments available */ + checkstackGCp(L, nextra, where); /* ensure stack space */ + L->top.p = where + nextra; /* next instruction will need top */ + } + for (i = 0; i < wanted && i < nextra; i++) + setobjs2s(L, where + i, ci->func.p - nextra + i); + for (; i < wanted; i++) /* complete required results with nil */ + setnilvalue(s2v(where + i)); +} + diff --git a/06/lua-5.4.6/src/ltm.h b/06/lua-5.4.6/src/ltm.h new file mode 100644 index 0000000..c309e2a --- /dev/null +++ b/06/lua-5.4.6/src/ltm.h @@ -0,0 +1,104 @@ +/* +** $Id: ltm.h $ +** Tag methods +** See Copyright Notice in lua.h +*/ + +#ifndef ltm_h +#define ltm_h + + +#include "lobject.h" +#include "lstate.h" + + +/* +* WARNING: if you change the order of this enumeration, +* grep "ORDER TM" and "ORDER OP" +*/ +typedef enum { + TM_INDEX, + TM_NEWINDEX, + TM_GC, + TM_MODE, + TM_LEN, + TM_EQ, /* last tag method with fast access */ + TM_ADD, + TM_SUB, + TM_MUL, + TM_MOD, + TM_POW, + TM_DIV, + TM_IDIV, + TM_BAND, + TM_BOR, + TM_BXOR, + TM_SHL, + TM_SHR, + TM_UNM, + TM_BNOT, + TM_LT, + TM_LE, + TM_CONCAT, + TM_CALL, + TM_CLOSE, + TM_N /* number of elements in the enum */ +} TMS; + + +/* +** Mask with 1 in all fast-access methods. A 1 in any of these bits +** in the flag of a (meta)table means the metatable does not have the +** corresponding metamethod field. (Bit 7 of the flag is used for +** 'isrealasize'.) +*/ +#define maskflags (~(~0u << (TM_EQ + 1))) + + +/* +** Test whether there is no tagmethod. +** (Because tagmethods use raw accesses, the result may be an "empty" nil.) +*/ +#define notm(tm) ttisnil(tm) + + +#define gfasttm(g,et,e) ((et) == NULL ? NULL : \ + ((et)->flags & (1u<<(e))) ? NULL : luaT_gettm(et, e, (g)->tmname[e])) + +#define fasttm(l,et,e) gfasttm(G(l), et, e) + +#define ttypename(x) luaT_typenames_[(x) + 1] + +LUAI_DDEC(const char *const luaT_typenames_[LUA_TOTALTYPES];) + + +LUAI_FUNC const char *luaT_objtypename (lua_State *L, const TValue *o); + +LUAI_FUNC const TValue *luaT_gettm (Table *events, TMS event, TString *ename); +LUAI_FUNC const TValue *luaT_gettmbyobj (lua_State *L, const TValue *o, + TMS event); +LUAI_FUNC void luaT_init (lua_State *L); + +LUAI_FUNC void luaT_callTM (lua_State *L, const TValue *f, const TValue *p1, + const TValue *p2, const TValue *p3); +LUAI_FUNC void luaT_callTMres (lua_State *L, const TValue *f, + const TValue *p1, const TValue *p2, StkId p3); +LUAI_FUNC void luaT_trybinTM (lua_State *L, const TValue *p1, const TValue *p2, + StkId res, TMS event); +LUAI_FUNC void luaT_tryconcatTM (lua_State *L); +LUAI_FUNC void luaT_trybinassocTM (lua_State *L, const TValue *p1, + const TValue *p2, int inv, StkId res, TMS event); +LUAI_FUNC void luaT_trybiniTM (lua_State *L, const TValue *p1, lua_Integer i2, + int inv, StkId res, TMS event); +LUAI_FUNC int luaT_callorderTM (lua_State *L, const TValue *p1, + const TValue *p2, TMS event); +LUAI_FUNC int luaT_callorderiTM (lua_State *L, const TValue *p1, int v2, + int inv, int isfloat, TMS event); + +LUAI_FUNC void luaT_adjustvarargs (lua_State *L, int nfixparams, + CallInfo *ci, const Proto *p); +LUAI_FUNC void luaT_getvarargs (lua_State *L, CallInfo *ci, + StkId where, int wanted); + + +#endif diff --git a/06/lua-5.4.6/src/lua.c b/06/lua-5.4.6/src/lua.c new file mode 100644 index 0000000..0ff8845 --- /dev/null +++ b/06/lua-5.4.6/src/lua.c @@ -0,0 +1,679 @@ +/* +** $Id: lua.c $ +** Lua stand-alone interpreter +** See Copyright Notice in lua.h +*/ + +#define lua_c + +#include "lprefix.h" + + +#include +#include +#include + +#include + +#include "lua.h" + +#include "lauxlib.h" +#include "lualib.h" + + +#if !defined(LUA_PROGNAME) +#define LUA_PROGNAME "lua" +#endif + +#if !defined(LUA_INIT_VAR) +#define LUA_INIT_VAR "LUA_INIT" +#endif + +#define LUA_INITVARVERSION LUA_INIT_VAR LUA_VERSUFFIX + + +static lua_State *globalL = NULL; + +static const char *progname = LUA_PROGNAME; + + +#if defined(LUA_USE_POSIX) /* { */ + +/* +** Use 'sigaction' when available. +*/ +static void setsignal (int sig, void (*handler)(int)) { + struct sigaction sa; + sa.sa_handler = handler; + sa.sa_flags = 0; + sigemptyset(&sa.sa_mask); /* do not mask any signal */ + sigaction(sig, &sa, NULL); +} + +#else /* }{ */ + +#define setsignal signal + +#endif /* } */ + + +/* +** Hook set by signal function to stop the interpreter. +*/ +static void lstop (lua_State *L, lua_Debug *ar) { + (void)ar; /* unused arg. */ + lua_sethook(L, NULL, 0, 0); /* reset hook */ + luaL_error(L, "interrupted!"); +} + + +/* +** Function to be called at a C signal. Because a C signal cannot +** just change a Lua state (as there is no proper synchronization), +** this function only sets a hook that, when called, will stop the +** interpreter. +*/ +static void laction (int i) { + int flag = LUA_MASKCALL | LUA_MASKRET | LUA_MASKLINE | LUA_MASKCOUNT; + setsignal(i, SIG_DFL); /* if another SIGINT happens, terminate process */ + lua_sethook(globalL, lstop, flag, 1); +} + + +static void print_usage (const char *badoption) { + lua_writestringerror("%s: ", progname); + if (badoption[1] == 'e' || badoption[1] == 'l') + lua_writestringerror("'%s' needs argument\n", badoption); + else + lua_writestringerror("unrecognized option '%s'\n", badoption); + lua_writestringerror( + "usage: %s [options] [script [args]]\n" + "Available options are:\n" + " -e stat execute string 'stat'\n" + " -i enter interactive mode after executing 'script'\n" + " -l mod require library 'mod' into global 'mod'\n" + " -l g=mod require library 'mod' into global 'g'\n" + " -v show version information\n" + " -E ignore environment variables\n" + " -W turn warnings on\n" + " -- stop handling options\n" + " - stop handling options and execute stdin\n" + , + progname); +} + + +/* +** Prints an error message, adding the program name in front of it +** (if present) +*/ +static void l_message (const char *pname, const char *msg) { + if (pname) lua_writestringerror("%s: ", pname); + lua_writestringerror("%s\n", msg); +} + + +/* +** Check whether 'status' is not OK and, if so, prints the error +** message on the top of the stack. It assumes that the error object +** is a string, as it was either generated by Lua or by 'msghandler'. +*/ +static int report (lua_State *L, int status) { + if (status != LUA_OK) { + const char *msg = lua_tostring(L, -1); + l_message(progname, msg); + lua_pop(L, 1); /* remove message */ + } + return status; +} + + +/* +** Message handler used to run all chunks +*/ +static int msghandler (lua_State *L) { + const char *msg = lua_tostring(L, 1); + if (msg == NULL) { /* is error object not a string? */ + if (luaL_callmeta(L, 1, "__tostring") && /* does it have a metamethod */ + lua_type(L, -1) == LUA_TSTRING) /* that produces a string? */ + return 1; /* that is the message */ + else + msg = lua_pushfstring(L, "(error object is a %s value)", + luaL_typename(L, 1)); + } + luaL_traceback(L, L, msg, 1); /* append a standard traceback */ + return 1; /* return the traceback */ +} + + +/* +** Interface to 'lua_pcall', which sets appropriate message function +** and C-signal handler. Used to run all chunks. +*/ +static int docall (lua_State *L, int narg, int nres) { + int status; + int base = lua_gettop(L) - narg; /* function index */ + lua_pushcfunction(L, msghandler); /* push message handler */ + lua_insert(L, base); /* put it under function and args */ + globalL = L; /* to be available to 'laction' */ + setsignal(SIGINT, laction); /* set C-signal handler */ + status = lua_pcall(L, narg, nres, base); + setsignal(SIGINT, SIG_DFL); /* reset C-signal handler */ + lua_remove(L, base); /* remove message handler from the stack */ + return status; +} + + +static void print_version (void) { + lua_writestring(LUA_COPYRIGHT, strlen(LUA_COPYRIGHT)); + lua_writeline(); +} + + +/* +** Create the 'arg' table, which stores all arguments from the +** command line ('argv'). It should be aligned so that, at index 0, +** it has 'argv[script]', which is the script name. The arguments +** to the script (everything after 'script') go to positive indices; +** other arguments (before the script name) go to negative indices. +** If there is no script name, assume interpreter's name as base. +** (If there is no interpreter's name either, 'script' is -1, so +** table sizes are zero.) +*/ +static void createargtable (lua_State *L, char **argv, int argc, int script) { + int i, narg; + narg = argc - (script + 1); /* number of positive indices */ + lua_createtable(L, narg, script + 1); + for (i = 0; i < argc; i++) { + lua_pushstring(L, argv[i]); + lua_rawseti(L, -2, i - script); + } + lua_setglobal(L, "arg"); +} + + +static int dochunk (lua_State *L, int status) { + if (status == LUA_OK) status = docall(L, 0, 0); + return report(L, status); +} + + +static int dofile (lua_State *L, const char *name) { + return dochunk(L, luaL_loadfile(L, name)); +} + + +static int dostring (lua_State *L, const char *s, const char *name) { + return dochunk(L, luaL_loadbuffer(L, s, strlen(s), name)); +} + + +/* +** Receives 'globname[=modname]' and runs 'globname = require(modname)'. +*/ +static int dolibrary (lua_State *L, char *globname) { + int status; + char *modname = strchr(globname, '='); + if (modname == NULL) /* no explicit name? */ + modname = globname; /* module name is equal to global name */ + else { + *modname = '\0'; /* global name ends here */ + modname++; /* module name starts after the '=' */ + } + lua_getglobal(L, "require"); + lua_pushstring(L, modname); + status = docall(L, 1, 1); /* call 'require(modname)' */ + if (status == LUA_OK) + lua_setglobal(L, globname); /* globname = require(modname) */ + return report(L, status); +} + + +/* +** Push on the stack the contents of table 'arg' from 1 to #arg +*/ +static int pushargs (lua_State *L) { + int i, n; + if (lua_getglobal(L, "arg") != LUA_TTABLE) + luaL_error(L, "'arg' is not a table"); + n = (int)luaL_len(L, -1); + luaL_checkstack(L, n + 3, "too many arguments to script"); + for (i = 1; i <= n; i++) + lua_rawgeti(L, -i, i); + lua_remove(L, -i); /* remove table from the stack */ + return n; +} + + +static int handle_script (lua_State *L, char **argv) { + int status; + const char *fname = argv[0]; + if (strcmp(fname, "-") == 0 && strcmp(argv[-1], "--") != 0) + fname = NULL; /* stdin */ + status = luaL_loadfile(L, fname); + if (status == LUA_OK) { + int n = pushargs(L); /* push arguments to script */ + status = docall(L, n, LUA_MULTRET); + } + return report(L, status); +} + + +/* bits of various argument indicators in 'args' */ +#define has_error 1 /* bad option */ +#define has_i 2 /* -i */ +#define has_v 4 /* -v */ +#define has_e 8 /* -e */ +#define has_E 16 /* -E */ + + +/* +** Traverses all arguments from 'argv', returning a mask with those +** needed before running any Lua code or an error code if it finds any +** invalid argument. In case of error, 'first' is the index of the bad +** argument. Otherwise, 'first' is -1 if there is no program name, +** 0 if there is no script name, or the index of the script name. +*/ +static int collectargs (char **argv, int *first) { + int args = 0; + int i; + if (argv[0] != NULL) { /* is there a program name? */ + if (argv[0][0]) /* not empty? */ + progname = argv[0]; /* save it */ + } + else { /* no program name */ + *first = -1; + return 0; + } + for (i = 1; argv[i] != NULL; i++) { /* handle arguments */ + *first = i; + if (argv[i][0] != '-') /* not an option? */ + return args; /* stop handling options */ + switch (argv[i][1]) { /* else check option */ + case '-': /* '--' */ + if (argv[i][2] != '\0') /* extra characters after '--'? */ + return has_error; /* invalid option */ + *first = i + 1; + return args; + case '\0': /* '-' */ + return args; /* script "name" is '-' */ + case 'E': + if (argv[i][2] != '\0') /* extra characters? */ + return has_error; /* invalid option */ + args |= has_E; + break; + case 'W': + if (argv[i][2] != '\0') /* extra characters? */ + return has_error; /* invalid option */ + break; + case 'i': + args |= has_i; /* (-i implies -v) *//* FALLTHROUGH */ + case 'v': + if (argv[i][2] != '\0') /* extra characters? */ + return has_error; /* invalid option */ + args |= has_v; + break; + case 'e': + args |= has_e; /* FALLTHROUGH */ + case 'l': /* both options need an argument */ + if (argv[i][2] == '\0') { /* no concatenated argument? */ + i++; /* try next 'argv' */ + if (argv[i] == NULL || argv[i][0] == '-') + return has_error; /* no next argument or it is another option */ + } + break; + default: /* invalid option */ + return has_error; + } + } + *first = 0; /* no script name */ + return args; +} + + +/* +** Processes options 'e' and 'l', which involve running Lua code, and +** 'W', which also affects the state. +** Returns 0 if some code raises an error. +*/ +static int runargs (lua_State *L, char **argv, int n) { + int i; + for (i = 1; i < n; i++) { + int option = argv[i][1]; + lua_assert(argv[i][0] == '-'); /* already checked */ + switch (option) { + case 'e': case 'l': { + int status; + char *extra = argv[i] + 2; /* both options need an argument */ + if (*extra == '\0') extra = argv[++i]; + lua_assert(extra != NULL); + status = (option == 'e') + ? dostring(L, extra, "=(command line)") + : dolibrary(L, extra); + if (status != LUA_OK) return 0; + break; + } + case 'W': + lua_warning(L, "@on", 0); /* warnings on */ + break; + } + } + return 1; +} + + +static int handle_luainit (lua_State *L) { + const char *name = "=" LUA_INITVARVERSION; + const char *init = getenv(name + 1); + if (init == NULL) { + name = "=" LUA_INIT_VAR; + init = getenv(name + 1); /* try alternative name */ + } + if (init == NULL) return LUA_OK; + else if (init[0] == '@') + return dofile(L, init+1); + else + return dostring(L, init, name); +} + + +/* +** {================================================================== +** Read-Eval-Print Loop (REPL) +** =================================================================== +*/ + +#if !defined(LUA_PROMPT) +#define LUA_PROMPT "> " +#define LUA_PROMPT2 ">> " +#endif + +#if !defined(LUA_MAXINPUT) +#define LUA_MAXINPUT 512 +#endif + + +/* +** lua_stdin_is_tty detects whether the standard input is a 'tty' (that +** is, whether we're running lua interactively). +*/ +#if !defined(lua_stdin_is_tty) /* { */ + +#if defined(LUA_USE_POSIX) /* { */ + +#include +#define lua_stdin_is_tty() isatty(0) + +#elif defined(LUA_USE_WINDOWS) /* }{ */ + +#include +#include + +#define lua_stdin_is_tty() _isatty(_fileno(stdin)) + +#else /* }{ */ + +/* ISO C definition */ +#define lua_stdin_is_tty() 1 /* assume stdin is a tty */ + +#endif /* } */ + +#endif /* } */ + + +/* +** lua_readline defines how to show a prompt and then read a line from +** the standard input. +** lua_saveline defines how to "save" a read line in a "history". +** lua_freeline defines how to free a line read by lua_readline. +*/ +#if !defined(lua_readline) /* { */ + +#if defined(LUA_USE_READLINE) /* { */ + +#include +#include +#define lua_initreadline(L) ((void)L, rl_readline_name="lua") +#define lua_readline(L,b,p) ((void)L, ((b)=readline(p)) != NULL) +#define lua_saveline(L,line) ((void)L, add_history(line)) +#define lua_freeline(L,b) ((void)L, free(b)) + +#else /* }{ */ + +#define lua_initreadline(L) ((void)L) +#define lua_readline(L,b,p) \ + ((void)L, fputs(p, stdout), fflush(stdout), /* show prompt */ \ + fgets(b, LUA_MAXINPUT, stdin) != NULL) /* get line */ +#define lua_saveline(L,line) { (void)L; (void)line; } +#define lua_freeline(L,b) { (void)L; (void)b; } + +#endif /* } */ + +#endif /* } */ + + +/* +** Return the string to be used as a prompt by the interpreter. Leave +** the string (or nil, if using the default value) on the stack, to keep +** it anchored. +*/ +static const char *get_prompt (lua_State *L, int firstline) { + if (lua_getglobal(L, firstline ? "_PROMPT" : "_PROMPT2") == LUA_TNIL) + return (firstline ? LUA_PROMPT : LUA_PROMPT2); /* use the default */ + else { /* apply 'tostring' over the value */ + const char *p = luaL_tolstring(L, -1, NULL); + lua_remove(L, -2); /* remove original value */ + return p; + } +} + +/* mark in error messages for incomplete statements */ +#define EOFMARK "" +#define marklen (sizeof(EOFMARK)/sizeof(char) - 1) + + +/* +** Check whether 'status' signals a syntax error and the error +** message at the top of the stack ends with the above mark for +** incomplete statements. +*/ +static int incomplete (lua_State *L, int status) { + if (status == LUA_ERRSYNTAX) { + size_t lmsg; + const char *msg = lua_tolstring(L, -1, &lmsg); + if (lmsg >= marklen && strcmp(msg + lmsg - marklen, EOFMARK) == 0) { + lua_pop(L, 1); + return 1; + } + } + return 0; /* else... */ +} + + +/* +** Prompt the user, read a line, and push it into the Lua stack. +*/ +static int pushline (lua_State *L, int firstline) { + char buffer[LUA_MAXINPUT]; + char *b = buffer; + size_t l; + const char *prmt = get_prompt(L, firstline); + int readstatus = lua_readline(L, b, prmt); + if (readstatus == 0) + return 0; /* no input (prompt will be popped by caller) */ + lua_pop(L, 1); /* remove prompt */ + l = strlen(b); + if (l > 0 && b[l-1] == '\n') /* line ends with newline? */ + b[--l] = '\0'; /* remove it */ + if (firstline && b[0] == '=') /* for compatibility with 5.2, ... */ + lua_pushfstring(L, "return %s", b + 1); /* change '=' to 'return' */ + else + lua_pushlstring(L, b, l); + lua_freeline(L, b); + return 1; +} + + +/* +** Try to compile line on the stack as 'return ;'; on return, stack +** has either compiled chunk or original line (if compilation failed). +*/ +static int addreturn (lua_State *L) { + const char *line = lua_tostring(L, -1); /* original line */ + const char *retline = lua_pushfstring(L, "return %s;", line); + int status = luaL_loadbuffer(L, retline, strlen(retline), "=stdin"); + if (status == LUA_OK) { + lua_remove(L, -2); /* remove modified line */ + if (line[0] != '\0') /* non empty? */ + lua_saveline(L, line); /* keep history */ + } + else + lua_pop(L, 2); /* pop result from 'luaL_loadbuffer' and modified line */ + return status; +} + + +/* +** Read multiple lines until a complete Lua statement +*/ +static int multiline (lua_State *L) { + for (;;) { /* repeat until gets a complete statement */ + size_t len; + const char *line = lua_tolstring(L, 1, &len); /* get what it has */ + int status = luaL_loadbuffer(L, line, len, "=stdin"); /* try it */ + if (!incomplete(L, status) || !pushline(L, 0)) { + lua_saveline(L, line); /* keep history */ + return status; /* cannot or should not try to add continuation line */ + } + lua_pushliteral(L, "\n"); /* add newline... */ + lua_insert(L, -2); /* ...between the two lines */ + lua_concat(L, 3); /* join them */ + } +} + + +/* +** Read a line and try to load (compile) it first as an expression (by +** adding "return " in front of it) and second as a statement. Return +** the final status of load/call with the resulting function (if any) +** in the top of the stack. +*/ +static int loadline (lua_State *L) { + int status; + lua_settop(L, 0); + if (!pushline(L, 1)) + return -1; /* no input */ + if ((status = addreturn(L)) != LUA_OK) /* 'return ...' did not work? */ + status = multiline(L); /* try as command, maybe with continuation lines */ + lua_remove(L, 1); /* remove line from the stack */ + lua_assert(lua_gettop(L) == 1); + return status; +} + + +/* +** Prints (calling the Lua 'print' function) any values on the stack +*/ +static void l_print (lua_State *L) { + int n = lua_gettop(L); + if (n > 0) { /* any result to be printed? */ + luaL_checkstack(L, LUA_MINSTACK, "too many results to print"); + lua_getglobal(L, "print"); + lua_insert(L, 1); + if (lua_pcall(L, n, 0, 0) != LUA_OK) + l_message(progname, lua_pushfstring(L, "error calling 'print' (%s)", + lua_tostring(L, -1))); + } +} + + +/* +** Do the REPL: repeatedly read (load) a line, evaluate (call) it, and +** print any results. +*/ +static void doREPL (lua_State *L) { + int status; + const char *oldprogname = progname; + progname = NULL; /* no 'progname' on errors in interactive mode */ + lua_initreadline(L); + while ((status = loadline(L)) != -1) { + if (status == LUA_OK) + status = docall(L, 0, LUA_MULTRET); + if (status == LUA_OK) l_print(L); + else report(L, status); + } + lua_settop(L, 0); /* clear stack */ + lua_writeline(); + progname = oldprogname; +} + +/* }================================================================== */ + + +/* +** Main body of stand-alone interpreter (to be called in protected mode). +** Reads the options and handles them all. +*/ +static int pmain (lua_State *L) { + int argc = (int)lua_tointeger(L, 1); + char **argv = (char **)lua_touserdata(L, 2); + int script; + int args = collectargs(argv, &script); + int optlim = (script > 0) ? script : argc; /* first argv not an option */ + luaL_checkversion(L); /* check that interpreter has correct version */ + if (args == has_error) { /* bad arg? */ + print_usage(argv[script]); /* 'script' has index of bad arg. */ + return 0; + } + if (args & has_v) /* option '-v'? */ + print_version(); + if (args & has_E) { /* option '-E'? */ + lua_pushboolean(L, 1); /* signal for libraries to ignore env. vars. */ + lua_setfield(L, LUA_REGISTRYINDEX, "LUA_NOENV"); + } + luaL_openlibs(L); /* open standard libraries */ + createargtable(L, argv, argc, script); /* create table 'arg' */ + lua_gc(L, LUA_GCRESTART); /* start GC... */ + lua_gc(L, LUA_GCGEN, 0, 0); /* ...in generational mode */ + if (!(args & has_E)) { /* no option '-E'? */ + if (handle_luainit(L) != LUA_OK) /* run LUA_INIT */ + return 0; /* error running LUA_INIT */ + } + if (!runargs(L, argv, optlim)) /* execute arguments -e and -l */ + return 0; /* something failed */ + if (script > 0) { /* execute main script (if there is one) */ + if (handle_script(L, argv + script) != LUA_OK) + return 0; /* interrupt in case of error */ + } + if (args & has_i) /* -i option? */ + doREPL(L); /* do read-eval-print loop */ + else if (script < 1 && !(args & (has_e | has_v))) { /* no active option? */ + if (lua_stdin_is_tty()) { /* running in interactive mode? */ + print_version(); + doREPL(L); /* do read-eval-print loop */ + } + else dofile(L, NULL); /* executes stdin as a file */ + } + lua_pushboolean(L, 1); /* signal no errors */ + return 1; +} + + +int main (int argc, char **argv) { + int status, result; + lua_State *L = luaL_newstate(); /* create state */ + if (L == NULL) { + l_message(argv[0], "cannot create state: not enough memory"); + return EXIT_FAILURE; + } + lua_gc(L, LUA_GCSTOP); /* stop GC while building state */ + lua_pushcfunction(L, &pmain); /* to call 'pmain' in protected mode */ + lua_pushinteger(L, argc); /* 1st argument */ + lua_pushlightuserdata(L, argv); /* 2nd argument */ + status = lua_pcall(L, 2, 1, 0); /* do the call */ + result = lua_toboolean(L, -1); /* get result */ + report(L, status); + lua_close(L); + return (result && status == LUA_OK) ? EXIT_SUCCESS : EXIT_FAILURE; +} + diff --git a/06/lua-5.4.6/src/lua.h b/06/lua-5.4.6/src/lua.h new file mode 100644 index 0000000..fd16cf8 --- /dev/null +++ b/06/lua-5.4.6/src/lua.h @@ -0,0 +1,523 @@ +/* +** $Id: lua.h $ +** Lua - A Scripting Language +** Lua.org, PUC-Rio, Brazil (http://www.lua.org) +** See Copyright Notice at the end of this file +*/ + + +#ifndef lua_h +#define lua_h + +#include +#include + + +#include "luaconf.h" + + +#define LUA_VERSION_MAJOR "5" +#define LUA_VERSION_MINOR "4" +#define LUA_VERSION_RELEASE "6" + +#define LUA_VERSION_NUM 504 +#define LUA_VERSION_RELEASE_NUM (LUA_VERSION_NUM * 100 + 6) + +#define LUA_VERSION "Lua " LUA_VERSION_MAJOR "." LUA_VERSION_MINOR +#define LUA_RELEASE LUA_VERSION "." LUA_VERSION_RELEASE +#define LUA_COPYRIGHT LUA_RELEASE " Copyright (C) 1994-2023 Lua.org, PUC-Rio" +#define LUA_AUTHORS "R. Ierusalimschy, L. H. de Figueiredo, W. Celes" + + +/* mark for precompiled code ('Lua') */ +#define LUA_SIGNATURE "\x1bLua" + +/* option for multiple returns in 'lua_pcall' and 'lua_call' */ +#define LUA_MULTRET (-1) + + +/* +** Pseudo-indices +** (-LUAI_MAXSTACK is the minimum valid index; we keep some free empty +** space after that to help overflow detection) +*/ +#define LUA_REGISTRYINDEX (-LUAI_MAXSTACK - 1000) +#define lua_upvalueindex(i) (LUA_REGISTRYINDEX - (i)) + + +/* thread status */ +#define LUA_OK 0 +#define LUA_YIELD 1 +#define LUA_ERRRUN 2 +#define LUA_ERRSYNTAX 3 +#define LUA_ERRMEM 4 +#define LUA_ERRERR 5 + + +typedef struct lua_State lua_State; + + +/* +** basic types +*/ +#define LUA_TNONE (-1) + +#define LUA_TNIL 0 +#define LUA_TBOOLEAN 1 +#define LUA_TLIGHTUSERDATA 2 +#define LUA_TNUMBER 3 +#define LUA_TSTRING 4 +#define LUA_TTABLE 5 +#define LUA_TFUNCTION 6 +#define LUA_TUSERDATA 7 +#define LUA_TTHREAD 8 + +#define LUA_NUMTYPES 9 + + + +/* minimum Lua stack available to a C function */ +#define LUA_MINSTACK 20 + + +/* predefined values in the registry */ +#define LUA_RIDX_MAINTHREAD 1 +#define LUA_RIDX_GLOBALS 2 +#define LUA_RIDX_LAST LUA_RIDX_GLOBALS + + +/* type of numbers in Lua */ +typedef LUA_NUMBER lua_Number; + + +/* type for integer functions */ +typedef LUA_INTEGER lua_Integer; + +/* unsigned integer type */ +typedef LUA_UNSIGNED lua_Unsigned; + +/* type for continuation-function contexts */ +typedef LUA_KCONTEXT lua_KContext; + + +/* +** Type for C functions registered with Lua +*/ +typedef int (*lua_CFunction) (lua_State *L); + +/* +** Type for continuation functions +*/ +typedef int (*lua_KFunction) (lua_State *L, int status, lua_KContext ctx); + + +/* +** Type for functions that read/write blocks when loading/dumping Lua chunks +*/ +typedef const char * (*lua_Reader) (lua_State *L, void *ud, size_t *sz); + +typedef int (*lua_Writer) (lua_State *L, const void *p, size_t sz, void *ud); + + +/* +** Type for memory-allocation functions +*/ +typedef void * (*lua_Alloc) (void *ud, void *ptr, size_t osize, size_t nsize); + + +/* +** Type for warning functions +*/ +typedef void (*lua_WarnFunction) (void *ud, const char *msg, int tocont); + + +/* +** Type used by the debug API to collect debug information +*/ +typedef struct lua_Debug lua_Debug; + + +/* +** Functions to be called by the debugger in specific events +*/ +typedef void (*lua_Hook) (lua_State *L, lua_Debug *ar); + + +/* +** generic extra include file +*/ +#if defined(LUA_USER_H) +#include LUA_USER_H +#endif + + +/* +** RCS ident string +*/ +extern const char lua_ident[]; + + +/* +** state manipulation +*/ +LUA_API lua_State *(lua_newstate) (lua_Alloc f, void *ud); +LUA_API void (lua_close) (lua_State *L); +LUA_API lua_State *(lua_newthread) (lua_State *L); +LUA_API int (lua_closethread) (lua_State *L, lua_State *from); +LUA_API int (lua_resetthread) (lua_State *L); /* Deprecated! */ + +LUA_API lua_CFunction (lua_atpanic) (lua_State *L, lua_CFunction panicf); + + +LUA_API lua_Number (lua_version) (lua_State *L); + + +/* +** basic stack manipulation +*/ +LUA_API int (lua_absindex) (lua_State *L, int idx); +LUA_API int (lua_gettop) (lua_State *L); +LUA_API void (lua_settop) (lua_State *L, int idx); +LUA_API void (lua_pushvalue) (lua_State *L, int idx); +LUA_API void (lua_rotate) (lua_State *L, int idx, int n); +LUA_API void (lua_copy) (lua_State *L, int fromidx, int toidx); +LUA_API int (lua_checkstack) (lua_State *L, int n); + +LUA_API void (lua_xmove) (lua_State *from, lua_State *to, int n); + + +/* +** access functions (stack -> C) +*/ + +LUA_API int (lua_isnumber) (lua_State *L, int idx); +LUA_API int (lua_isstring) (lua_State *L, int idx); +LUA_API int (lua_iscfunction) (lua_State *L, int idx); +LUA_API int (lua_isinteger) (lua_State *L, int idx); +LUA_API int (lua_isuserdata) (lua_State *L, int idx); +LUA_API int (lua_type) (lua_State *L, int idx); +LUA_API const char *(lua_typename) (lua_State *L, int tp); + +LUA_API lua_Number (lua_tonumberx) (lua_State *L, int idx, int *isnum); +LUA_API lua_Integer (lua_tointegerx) (lua_State *L, int idx, int *isnum); +LUA_API int (lua_toboolean) (lua_State *L, int idx); +LUA_API const char *(lua_tolstring) (lua_State *L, int idx, size_t *len); +LUA_API lua_Unsigned (lua_rawlen) (lua_State *L, int idx); +LUA_API lua_CFunction (lua_tocfunction) (lua_State *L, int idx); +LUA_API void *(lua_touserdata) (lua_State *L, int idx); +LUA_API lua_State *(lua_tothread) (lua_State *L, int idx); +LUA_API const void *(lua_topointer) (lua_State *L, int idx); + + +/* +** Comparison and arithmetic functions +*/ + +#define LUA_OPADD 0 /* ORDER TM, ORDER OP */ +#define LUA_OPSUB 1 +#define LUA_OPMUL 2 +#define LUA_OPMOD 3 +#define LUA_OPPOW 4 +#define LUA_OPDIV 5 +#define LUA_OPIDIV 6 +#define LUA_OPBAND 7 +#define LUA_OPBOR 8 +#define LUA_OPBXOR 9 +#define LUA_OPSHL 10 +#define LUA_OPSHR 11 +#define LUA_OPUNM 12 +#define LUA_OPBNOT 13 + +LUA_API void (lua_arith) (lua_State *L, int op); + +#define LUA_OPEQ 0 +#define LUA_OPLT 1 +#define LUA_OPLE 2 + +LUA_API int (lua_rawequal) (lua_State *L, int idx1, int idx2); +LUA_API int (lua_compare) (lua_State *L, int idx1, int idx2, int op); + + +/* +** push functions (C -> stack) +*/ +LUA_API void (lua_pushnil) (lua_State *L); +LUA_API void (lua_pushnumber) (lua_State *L, lua_Number n); +LUA_API void (lua_pushinteger) (lua_State *L, lua_Integer n); +LUA_API const char *(lua_pushlstring) (lua_State *L, const char *s, size_t len); +LUA_API const char *(lua_pushstring) (lua_State *L, const char *s); +LUA_API const char *(lua_pushvfstring) (lua_State *L, const char *fmt, + va_list argp); +LUA_API const char *(lua_pushfstring) (lua_State *L, const char *fmt, ...); +LUA_API void (lua_pushcclosure) (lua_State *L, lua_CFunction fn, int n); +LUA_API void (lua_pushboolean) (lua_State *L, int b); +LUA_API void (lua_pushlightuserdata) (lua_State *L, void *p); +LUA_API int (lua_pushthread) (lua_State *L); + + +/* +** get functions (Lua -> stack) +*/ +LUA_API int (lua_getglobal) (lua_State *L, const char *name); +LUA_API int (lua_gettable) (lua_State *L, int idx); +LUA_API int (lua_getfield) (lua_State *L, int idx, const char *k); +LUA_API int (lua_geti) (lua_State *L, int idx, lua_Integer n); +LUA_API int (lua_rawget) (lua_State *L, int idx); +LUA_API int (lua_rawgeti) (lua_State *L, int idx, lua_Integer n); +LUA_API int (lua_rawgetp) (lua_State *L, int idx, const void *p); + +LUA_API void (lua_createtable) (lua_State *L, int narr, int nrec); +LUA_API void *(lua_newuserdatauv) (lua_State *L, size_t sz, int nuvalue); +LUA_API int (lua_getmetatable) (lua_State *L, int objindex); +LUA_API int (lua_getiuservalue) (lua_State *L, int idx, int n); + + +/* +** set functions (stack -> Lua) +*/ +LUA_API void (lua_setglobal) (lua_State *L, const char *name); +LUA_API void (lua_settable) (lua_State *L, int idx); +LUA_API void (lua_setfield) (lua_State *L, int idx, const char *k); +LUA_API void (lua_seti) (lua_State *L, int idx, lua_Integer n); +LUA_API void (lua_rawset) (lua_State *L, int idx); +LUA_API void (lua_rawseti) (lua_State *L, int idx, lua_Integer n); +LUA_API void (lua_rawsetp) (lua_State *L, int idx, const void *p); +LUA_API int (lua_setmetatable) (lua_State *L, int objindex); +LUA_API int (lua_setiuservalue) (lua_State *L, int idx, int n); + + +/* +** 'load' and 'call' functions (load and run Lua code) +*/ +LUA_API void (lua_callk) (lua_State *L, int nargs, int nresults, + lua_KContext ctx, lua_KFunction k); +#define lua_call(L,n,r) lua_callk(L, (n), (r), 0, NULL) + +LUA_API int (lua_pcallk) (lua_State *L, int nargs, int nresults, int errfunc, + lua_KContext ctx, lua_KFunction k); +#define lua_pcall(L,n,r,f) lua_pcallk(L, (n), (r), (f), 0, NULL) + +LUA_API int (lua_load) (lua_State *L, lua_Reader reader, void *dt, + const char *chunkname, const char *mode); + +LUA_API int (lua_dump) (lua_State *L, lua_Writer writer, void *data, int strip); + + +/* +** coroutine functions +*/ +LUA_API int (lua_yieldk) (lua_State *L, int nresults, lua_KContext ctx, + lua_KFunction k); +LUA_API int (lua_resume) (lua_State *L, lua_State *from, int narg, + int *nres); +LUA_API int (lua_status) (lua_State *L); +LUA_API int (lua_isyieldable) (lua_State *L); + +#define lua_yield(L,n) lua_yieldk(L, (n), 0, NULL) + + +/* +** Warning-related functions +*/ +LUA_API void (lua_setwarnf) (lua_State *L, lua_WarnFunction f, void *ud); +LUA_API void (lua_warning) (lua_State *L, const char *msg, int tocont); + + +/* +** garbage-collection function and options +*/ + +#define LUA_GCSTOP 0 +#define LUA_GCRESTART 1 +#define LUA_GCCOLLECT 2 +#define LUA_GCCOUNT 3 +#define LUA_GCCOUNTB 4 +#define LUA_GCSTEP 5 +#define LUA_GCSETPAUSE 6 +#define LUA_GCSETSTEPMUL 7 +#define LUA_GCISRUNNING 9 +#define LUA_GCGEN 10 +#define LUA_GCINC 11 + +LUA_API int (lua_gc) (lua_State *L, int what, ...); + + +/* +** miscellaneous functions +*/ + +LUA_API int (lua_error) (lua_State *L); + +LUA_API int (lua_next) (lua_State *L, int idx); + +LUA_API void (lua_concat) (lua_State *L, int n); +LUA_API void (lua_len) (lua_State *L, int idx); + +LUA_API size_t (lua_stringtonumber) (lua_State *L, const char *s); + +LUA_API lua_Alloc (lua_getallocf) (lua_State *L, void **ud); +LUA_API void (lua_setallocf) (lua_State *L, lua_Alloc f, void *ud); + +LUA_API void (lua_toclose) (lua_State *L, int idx); +LUA_API void (lua_closeslot) (lua_State *L, int idx); + + +/* +** {============================================================== +** some useful macros +** =============================================================== +*/ + +#define lua_getextraspace(L) ((void *)((char *)(L) - LUA_EXTRASPACE)) + +#define lua_tonumber(L,i) lua_tonumberx(L,(i),NULL) +#define lua_tointeger(L,i) lua_tointegerx(L,(i),NULL) + +#define lua_pop(L,n) lua_settop(L, -(n)-1) + +#define lua_newtable(L) lua_createtable(L, 0, 0) + +#define lua_register(L,n,f) (lua_pushcfunction(L, (f)), lua_setglobal(L, (n))) + +#define lua_pushcfunction(L,f) lua_pushcclosure(L, (f), 0) + +#define lua_isfunction(L,n) (lua_type(L, (n)) == LUA_TFUNCTION) +#define lua_istable(L,n) (lua_type(L, (n)) == LUA_TTABLE) +#define lua_islightuserdata(L,n) (lua_type(L, (n)) == LUA_TLIGHTUSERDATA) +#define lua_isnil(L,n) (lua_type(L, (n)) == LUA_TNIL) +#define lua_isboolean(L,n) (lua_type(L, (n)) == LUA_TBOOLEAN) +#define lua_isthread(L,n) (lua_type(L, (n)) == LUA_TTHREAD) +#define lua_isnone(L,n) (lua_type(L, (n)) == LUA_TNONE) +#define lua_isnoneornil(L, n) (lua_type(L, (n)) <= 0) + +#define lua_pushliteral(L, s) lua_pushstring(L, "" s) + +#define lua_pushglobaltable(L) \ + ((void)lua_rawgeti(L, LUA_REGISTRYINDEX, LUA_RIDX_GLOBALS)) + +#define lua_tostring(L,i) lua_tolstring(L, (i), NULL) + + +#define lua_insert(L,idx) lua_rotate(L, (idx), 1) + +#define lua_remove(L,idx) (lua_rotate(L, (idx), -1), lua_pop(L, 1)) + +#define lua_replace(L,idx) (lua_copy(L, -1, (idx)), lua_pop(L, 1)) + +/* }============================================================== */ + + +/* +** {============================================================== +** compatibility macros +** =============================================================== +*/ +#if defined(LUA_COMPAT_APIINTCASTS) + +#define lua_pushunsigned(L,n) lua_pushinteger(L, (lua_Integer)(n)) +#define lua_tounsignedx(L,i,is) ((lua_Unsigned)lua_tointegerx(L,i,is)) +#define lua_tounsigned(L,i) lua_tounsignedx(L,(i),NULL) + +#endif + +#define lua_newuserdata(L,s) lua_newuserdatauv(L,s,1) +#define lua_getuservalue(L,idx) lua_getiuservalue(L,idx,1) +#define lua_setuservalue(L,idx) lua_setiuservalue(L,idx,1) + +#define LUA_NUMTAGS LUA_NUMTYPES + +/* }============================================================== */ + +/* +** {====================================================================== +** Debug API +** ======================================================================= +*/ + + +/* +** Event codes +*/ +#define LUA_HOOKCALL 0 +#define LUA_HOOKRET 1 +#define LUA_HOOKLINE 2 +#define LUA_HOOKCOUNT 3 +#define LUA_HOOKTAILCALL 4 + + +/* +** Event masks +*/ +#define LUA_MASKCALL (1 << LUA_HOOKCALL) +#define LUA_MASKRET (1 << LUA_HOOKRET) +#define LUA_MASKLINE (1 << LUA_HOOKLINE) +#define LUA_MASKCOUNT (1 << LUA_HOOKCOUNT) + + +LUA_API int (lua_getstack) (lua_State *L, int level, lua_Debug *ar); +LUA_API int (lua_getinfo) (lua_State *L, const char *what, lua_Debug *ar); +LUA_API const char *(lua_getlocal) (lua_State *L, const lua_Debug *ar, int n); +LUA_API const char *(lua_setlocal) (lua_State *L, const lua_Debug *ar, int n); +LUA_API const char *(lua_getupvalue) (lua_State *L, int funcindex, int n); +LUA_API const char *(lua_setupvalue) (lua_State *L, int funcindex, int n); + +LUA_API void *(lua_upvalueid) (lua_State *L, int fidx, int n); +LUA_API void (lua_upvaluejoin) (lua_State *L, int fidx1, int n1, + int fidx2, int n2); + +LUA_API void (lua_sethook) (lua_State *L, lua_Hook func, int mask, int count); +LUA_API lua_Hook (lua_gethook) (lua_State *L); +LUA_API int (lua_gethookmask) (lua_State *L); +LUA_API int (lua_gethookcount) (lua_State *L); + +LUA_API int (lua_setcstacklimit) (lua_State *L, unsigned int limit); + +struct lua_Debug { + int event; + const char *name; /* (n) */ + const char *namewhat; /* (n) 'global', 'local', 'field', 'method' */ + const char *what; /* (S) 'Lua', 'C', 'main', 'tail' */ + const char *source; /* (S) */ + size_t srclen; /* (S) */ + int currentline; /* (l) */ + int linedefined; /* (S) */ + int lastlinedefined; /* (S) */ + unsigned char nups; /* (u) number of upvalues */ + unsigned char nparams;/* (u) number of parameters */ + char isvararg; /* (u) */ + char istailcall; /* (t) */ + unsigned short ftransfer; /* (r) index of first value transferred */ + unsigned short ntransfer; /* (r) number of transferred values */ + char short_src[LUA_IDSIZE]; /* (S) */ + /* private part */ + struct CallInfo *i_ci; /* active function */ +}; + +/* }====================================================================== */ + + +/****************************************************************************** +* Copyright (C) 1994-2023 Lua.org, PUC-Rio. +* +* Permission is hereby granted, free of charge, to any person obtaining +* a copy of this software and associated documentation files (the +* "Software"), to deal in the Software without restriction, including +* without limitation the rights to use, copy, modify, merge, publish, +* distribute, sublicense, and/or sell copies of the Software, and to +* permit persons to whom the Software is furnished to do so, subject to +* the following conditions: +* +* The above copyright notice and this permission notice shall be +* included in all copies or substantial portions of the Software. +* +* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, +* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. +* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY +* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, +* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE +* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. +******************************************************************************/ + + +#endif diff --git a/06/lua-5.4.6/src/lua.hpp b/06/lua-5.4.6/src/lua.hpp new file mode 100644 index 0000000..ec417f5 --- /dev/null +++ b/06/lua-5.4.6/src/lua.hpp @@ -0,0 +1,9 @@ +// lua.hpp +// Lua header files for C++ +// <> not supplied automatically because Lua also compiles as C++ + +extern "C" { +#include "lua.h" +#include "lualib.h" +#include "lauxlib.h" +} diff --git a/06/lua-5.4.6/src/luac.c b/06/lua-5.4.6/src/luac.c new file mode 100644 index 0000000..5f4a141 --- /dev/null +++ b/06/lua-5.4.6/src/luac.c @@ -0,0 +1,723 @@ +/* +** $Id: luac.c $ +** Lua compiler (saves bytecodes to files; also lists bytecodes) +** See Copyright Notice in lua.h +*/ + +#define luac_c +#define LUA_CORE + +#include "lprefix.h" + +#include +#include +#include +#include +#include + +#include "lua.h" +#include "lauxlib.h" + +#include "ldebug.h" +#include "lobject.h" +#include "lopcodes.h" +#include "lopnames.h" +#include "lstate.h" +#include "lundump.h" + +static void PrintFunction(const Proto* f, int full); +#define luaU_print PrintFunction + +#define PROGNAME "luac" /* default program name */ +#define OUTPUT PROGNAME ".out" /* default output file */ + +static int listing=0; /* list bytecodes? */ +static int dumping=1; /* dump bytecodes? */ +static int stripping=0; /* strip debug information? */ +static char Output[]={ OUTPUT }; /* default output file name */ +static const char* output=Output; /* actual output file name */ +static const char* progname=PROGNAME; /* actual program name */ +static TString **tmname; + +static void fatal(const char* message) +{ + fprintf(stderr,"%s: %s\n",progname,message); + exit(EXIT_FAILURE); +} + +static void cannot(const char* what) +{ + fprintf(stderr,"%s: cannot %s %s: %s\n",progname,what,output,strerror(errno)); + exit(EXIT_FAILURE); +} + +static void usage(const char* message) +{ + if (*message=='-') + fprintf(stderr,"%s: unrecognized option '%s'\n",progname,message); + else + fprintf(stderr,"%s: %s\n",progname,message); + fprintf(stderr, + "usage: %s [options] [filenames]\n" + "Available options are:\n" + " -l list (use -l -l for full listing)\n" + " -o name output to file 'name' (default is \"%s\")\n" + " -p parse only\n" + " -s strip debug information\n" + " -v show version information\n" + " -- stop handling options\n" + " - stop handling options and process stdin\n" + ,progname,Output); + exit(EXIT_FAILURE); +} + +#define IS(s) (strcmp(argv[i],s)==0) + +static int doargs(int argc, char* argv[]) +{ + int i; + int version=0; + if (argv[0]!=NULL && *argv[0]!=0) progname=argv[0]; + for (i=1; itop.p+(i))) + +static const Proto* combine(lua_State* L, int n) +{ + if (n==1) + return toproto(L,-1); + else + { + Proto* f; + int i=n; + if (lua_load(L,reader,&i,"=(" PROGNAME ")",NULL)!=LUA_OK) fatal(lua_tostring(L,-1)); + f=toproto(L,-1); + for (i=0; ip[i]=toproto(L,i-n-1); + if (f->p[i]->sizeupvalues>0) f->p[i]->upvalues[0].instack=0; + } + return f; + } +} + +static int writer(lua_State* L, const void* p, size_t size, void* u) +{ + UNUSED(L); + return (fwrite(p,size,1,(FILE*)u)!=1) && (size!=0); +} + +static int pmain(lua_State* L) +{ + int argc=(int)lua_tointeger(L,1); + char** argv=(char**)lua_touserdata(L,2); + const Proto* f; + int i; + tmname=G(L)->tmname; + if (!lua_checkstack(L,argc)) fatal("too many input files"); + for (i=0; i1); + if (dumping) + { + FILE* D= (output==NULL) ? stdout : fopen(output,"wb"); + if (D==NULL) cannot("open"); + lua_lock(L); + luaU_dump(L,f,writer,D,stripping); + lua_unlock(L); + if (ferror(D)) cannot("write"); + if (fclose(D)) cannot("close"); + } + return 0; +} + +int main(int argc, char* argv[]) +{ + lua_State* L; + int i=doargs(argc,argv); + argc-=i; argv+=i; + if (argc<=0) usage("no input files given"); + L=luaL_newstate(); + if (L==NULL) fatal("cannot create state: not enough memory"); + lua_pushcfunction(L,&pmain); + lua_pushinteger(L,argc); + lua_pushlightuserdata(L,argv); + if (lua_pcall(L,2,0,0)!=LUA_OK) fatal(lua_tostring(L,-1)); + lua_close(L); + return EXIT_SUCCESS; +} + +/* +** print bytecodes +*/ + +#define UPVALNAME(x) ((f->upvalues[x].name) ? getstr(f->upvalues[x].name) : "-") +#define VOID(p) ((const void*)(p)) +#define eventname(i) (getstr(tmname[i])) + +static void PrintString(const TString* ts) +{ + const char* s=getstr(ts); + size_t i,n=tsslen(ts); + printf("\""); + for (i=0; ik[i]; + switch (ttypetag(o)) + { + case LUA_VNIL: + printf("N"); + break; + case LUA_VFALSE: + case LUA_VTRUE: + printf("B"); + break; + case LUA_VNUMFLT: + printf("F"); + break; + case LUA_VNUMINT: + printf("I"); + break; + case LUA_VSHRSTR: + case LUA_VLNGSTR: + printf("S"); + break; + default: /* cannot happen */ + printf("?%d",ttypetag(o)); + break; + } + printf("\t"); +} + +static void PrintConstant(const Proto* f, int i) +{ + const TValue* o=&f->k[i]; + switch (ttypetag(o)) + { + case LUA_VNIL: + printf("nil"); + break; + case LUA_VFALSE: + printf("false"); + break; + case LUA_VTRUE: + printf("true"); + break; + case LUA_VNUMFLT: + { + char buff[100]; + sprintf(buff,LUA_NUMBER_FMT,fltvalue(o)); + printf("%s",buff); + if (buff[strspn(buff,"-0123456789")]=='\0') printf(".0"); + break; + } + case LUA_VNUMINT: + printf(LUA_INTEGER_FMT,ivalue(o)); + break; + case LUA_VSHRSTR: + case LUA_VLNGSTR: + PrintString(tsvalue(o)); + break; + default: /* cannot happen */ + printf("?%d",ttypetag(o)); + break; + } +} + +#define COMMENT "\t; " +#define EXTRAARG GETARG_Ax(code[pc+1]) +#define EXTRAARGC (EXTRAARG*(MAXARG_C+1)) +#define ISK (isk ? "k" : "") + +static void PrintCode(const Proto* f) +{ + const Instruction* code=f->code; + int pc,n=f->sizecode; + for (pc=0; pc0) printf("[%d]\t",line); else printf("[-]\t"); + printf("%-9s\t",opnames[o]); + switch (o) + { + case OP_MOVE: + printf("%d %d",a,b); + break; + case OP_LOADI: + printf("%d %d",a,sbx); + break; + case OP_LOADF: + printf("%d %d",a,sbx); + break; + case OP_LOADK: + printf("%d %d",a,bx); + printf(COMMENT); PrintConstant(f,bx); + break; + case OP_LOADKX: + printf("%d",a); + printf(COMMENT); PrintConstant(f,EXTRAARG); + break; + case OP_LOADFALSE: + printf("%d",a); + break; + case OP_LFALSESKIP: + printf("%d",a); + break; + case OP_LOADTRUE: + printf("%d",a); + break; + case OP_LOADNIL: + printf("%d %d",a,b); + printf(COMMENT "%d out",b+1); + break; + case OP_GETUPVAL: + printf("%d %d",a,b); + printf(COMMENT "%s",UPVALNAME(b)); + break; + case OP_SETUPVAL: + printf("%d %d",a,b); + printf(COMMENT "%s",UPVALNAME(b)); + break; + case OP_GETTABUP: + printf("%d %d %d",a,b,c); + printf(COMMENT "%s",UPVALNAME(b)); + printf(" "); PrintConstant(f,c); + break; + case OP_GETTABLE: + printf("%d %d %d",a,b,c); + break; + case OP_GETI: + printf("%d %d %d",a,b,c); + break; + case OP_GETFIELD: + printf("%d %d %d",a,b,c); + printf(COMMENT); PrintConstant(f,c); + break; + case OP_SETTABUP: + printf("%d %d %d%s",a,b,c,ISK); + printf(COMMENT "%s",UPVALNAME(a)); + printf(" "); PrintConstant(f,b); + if (isk) { printf(" "); PrintConstant(f,c); } + break; + case OP_SETTABLE: + printf("%d %d %d%s",a,b,c,ISK); + if (isk) { printf(COMMENT); PrintConstant(f,c); } + break; + case OP_SETI: + printf("%d %d %d%s",a,b,c,ISK); + if (isk) { printf(COMMENT); PrintConstant(f,c); } + break; + case OP_SETFIELD: + printf("%d %d %d%s",a,b,c,ISK); + printf(COMMENT); PrintConstant(f,b); + if (isk) { printf(" "); PrintConstant(f,c); } + break; + case OP_NEWTABLE: + printf("%d %d %d",a,b,c); + printf(COMMENT "%d",c+EXTRAARGC); + break; + case OP_SELF: + printf("%d %d %d%s",a,b,c,ISK); + if (isk) { printf(COMMENT); PrintConstant(f,c); } + break; + case OP_ADDI: + printf("%d %d %d",a,b,sc); + break; + case OP_ADDK: + printf("%d %d %d",a,b,c); + printf(COMMENT); PrintConstant(f,c); + break; + case OP_SUBK: + printf("%d %d %d",a,b,c); + printf(COMMENT); PrintConstant(f,c); + break; + case OP_MULK: + printf("%d %d %d",a,b,c); + printf(COMMENT); PrintConstant(f,c); + break; + case OP_MODK: + printf("%d %d %d",a,b,c); + printf(COMMENT); PrintConstant(f,c); + break; + case OP_POWK: + printf("%d %d %d",a,b,c); + printf(COMMENT); PrintConstant(f,c); + break; + case OP_DIVK: + printf("%d %d %d",a,b,c); + printf(COMMENT); PrintConstant(f,c); + break; + case OP_IDIVK: + printf("%d %d %d",a,b,c); + printf(COMMENT); PrintConstant(f,c); + break; + case OP_BANDK: + printf("%d %d %d",a,b,c); + printf(COMMENT); PrintConstant(f,c); + break; + case OP_BORK: + printf("%d %d %d",a,b,c); + printf(COMMENT); PrintConstant(f,c); + break; + case OP_BXORK: + printf("%d %d %d",a,b,c); + printf(COMMENT); PrintConstant(f,c); + break; + case OP_SHRI: + printf("%d %d %d",a,b,sc); + break; + case OP_SHLI: + printf("%d %d %d",a,b,sc); + break; + case OP_ADD: + printf("%d %d %d",a,b,c); + break; + case OP_SUB: + printf("%d %d %d",a,b,c); + break; + case OP_MUL: + printf("%d %d %d",a,b,c); + break; + case OP_MOD: + printf("%d %d %d",a,b,c); + break; + case OP_POW: + printf("%d %d %d",a,b,c); + break; + case OP_DIV: + printf("%d %d %d",a,b,c); + break; + case OP_IDIV: + printf("%d %d %d",a,b,c); + break; + case OP_BAND: + printf("%d %d %d",a,b,c); + break; + case OP_BOR: + printf("%d %d %d",a,b,c); + break; + case OP_BXOR: + printf("%d %d %d",a,b,c); + break; + case OP_SHL: + printf("%d %d %d",a,b,c); + break; + case OP_SHR: + printf("%d %d %d",a,b,c); + break; + case OP_MMBIN: + printf("%d %d %d",a,b,c); + printf(COMMENT "%s",eventname(c)); + break; + case OP_MMBINI: + printf("%d %d %d %d",a,sb,c,isk); + printf(COMMENT "%s",eventname(c)); + if (isk) printf(" flip"); + break; + case OP_MMBINK: + printf("%d %d %d %d",a,b,c,isk); + printf(COMMENT "%s ",eventname(c)); PrintConstant(f,b); + if (isk) printf(" flip"); + break; + case OP_UNM: + printf("%d %d",a,b); + break; + case OP_BNOT: + printf("%d %d",a,b); + break; + case OP_NOT: + printf("%d %d",a,b); + break; + case OP_LEN: + printf("%d %d",a,b); + break; + case OP_CONCAT: + printf("%d %d",a,b); + break; + case OP_CLOSE: + printf("%d",a); + break; + case OP_TBC: + printf("%d",a); + break; + case OP_JMP: + printf("%d",GETARG_sJ(i)); + printf(COMMENT "to %d",GETARG_sJ(i)+pc+2); + break; + case OP_EQ: + printf("%d %d %d",a,b,isk); + break; + case OP_LT: + printf("%d %d %d",a,b,isk); + break; + case OP_LE: + printf("%d %d %d",a,b,isk); + break; + case OP_EQK: + printf("%d %d %d",a,b,isk); + printf(COMMENT); PrintConstant(f,b); + break; + case OP_EQI: + printf("%d %d %d",a,sb,isk); + break; + case OP_LTI: + printf("%d %d %d",a,sb,isk); + break; + case OP_LEI: + printf("%d %d %d",a,sb,isk); + break; + case OP_GTI: + printf("%d %d %d",a,sb,isk); + break; + case OP_GEI: + printf("%d %d %d",a,sb,isk); + break; + case OP_TEST: + printf("%d %d",a,isk); + break; + case OP_TESTSET: + printf("%d %d %d",a,b,isk); + break; + case OP_CALL: + printf("%d %d %d",a,b,c); + printf(COMMENT); + if (b==0) printf("all in "); else printf("%d in ",b-1); + if (c==0) printf("all out"); else printf("%d out",c-1); + break; + case OP_TAILCALL: + printf("%d %d %d%s",a,b,c,ISK); + printf(COMMENT "%d in",b-1); + break; + case OP_RETURN: + printf("%d %d %d%s",a,b,c,ISK); + printf(COMMENT); + if (b==0) printf("all out"); else printf("%d out",b-1); + break; + case OP_RETURN0: + break; + case OP_RETURN1: + printf("%d",a); + break; + case OP_FORLOOP: + printf("%d %d",a,bx); + printf(COMMENT "to %d",pc-bx+2); + break; + case OP_FORPREP: + printf("%d %d",a,bx); + printf(COMMENT "exit to %d",pc+bx+3); + break; + case OP_TFORPREP: + printf("%d %d",a,bx); + printf(COMMENT "to %d",pc+bx+2); + break; + case OP_TFORCALL: + printf("%d %d",a,c); + break; + case OP_TFORLOOP: + printf("%d %d",a,bx); + printf(COMMENT "to %d",pc-bx+2); + break; + case OP_SETLIST: + printf("%d %d %d",a,b,c); + if (isk) printf(COMMENT "%d",c+EXTRAARGC); + break; + case OP_CLOSURE: + printf("%d %d",a,bx); + printf(COMMENT "%p",VOID(f->p[bx])); + break; + case OP_VARARG: + printf("%d %d",a,c); + printf(COMMENT); + if (c==0) printf("all out"); else printf("%d out",c-1); + break; + case OP_VARARGPREP: + printf("%d",a); + break; + case OP_EXTRAARG: + printf("%d",ax); + break; +#if 0 + default: + printf("%d %d %d",a,b,c); + printf(COMMENT "not handled"); + break; +#endif + } + printf("\n"); + } +} + + +#define SS(x) ((x==1)?"":"s") +#define S(x) (int)(x),SS(x) + +static void PrintHeader(const Proto* f) +{ + const char* s=f->source ? getstr(f->source) : "=?"; + if (*s=='@' || *s=='=') + s++; + else if (*s==LUA_SIGNATURE[0]) + s="(bstring)"; + else + s="(string)"; + printf("\n%s <%s:%d,%d> (%d instruction%s at %p)\n", + (f->linedefined==0)?"main":"function",s, + f->linedefined,f->lastlinedefined, + S(f->sizecode),VOID(f)); + printf("%d%s param%s, %d slot%s, %d upvalue%s, ", + (int)(f->numparams),f->is_vararg?"+":"",SS(f->numparams), + S(f->maxstacksize),S(f->sizeupvalues)); + printf("%d local%s, %d constant%s, %d function%s\n", + S(f->sizelocvars),S(f->sizek),S(f->sizep)); +} + +static void PrintDebug(const Proto* f) +{ + int i,n; + n=f->sizek; + printf("constants (%d) for %p:\n",n,VOID(f)); + for (i=0; isizelocvars; + printf("locals (%d) for %p:\n",n,VOID(f)); + for (i=0; ilocvars[i].varname),f->locvars[i].startpc+1,f->locvars[i].endpc+1); + } + n=f->sizeupvalues; + printf("upvalues (%d) for %p:\n",n,VOID(f)); + for (i=0; iupvalues[i].instack,f->upvalues[i].idx); + } +} + +static void PrintFunction(const Proto* f, int full) +{ + int i,n=f->sizep; + PrintHeader(f); + PrintCode(f); + if (full) PrintDebug(f); + for (i=0; ip[i],full); +} diff --git a/06/lua-5.4.6/src/luaconf.h b/06/lua-5.4.6/src/luaconf.h new file mode 100644 index 0000000..137103e --- /dev/null +++ b/06/lua-5.4.6/src/luaconf.h @@ -0,0 +1,793 @@ +/* +** $Id: luaconf.h $ +** Configuration file for Lua +** See Copyright Notice in lua.h +*/ + + +#ifndef luaconf_h +#define luaconf_h + +#include +#include + + +/* +** =================================================================== +** General Configuration File for Lua +** +** Some definitions here can be changed externally, through the compiler +** (e.g., with '-D' options): They are commented out or protected +** by '#if !defined' guards. However, several other definitions +** should be changed directly here, either because they affect the +** Lua ABI (by making the changes here, you ensure that all software +** connected to Lua, such as C libraries, will be compiled with the same +** configuration); or because they are seldom changed. +** +** Search for "@@" to find all configurable definitions. +** =================================================================== +*/ + + +/* +** {==================================================================== +** System Configuration: macros to adapt (if needed) Lua to some +** particular platform, for instance restricting it to C89. +** ===================================================================== +*/ + +/* +@@ LUA_USE_C89 controls the use of non-ISO-C89 features. +** Define it if you want Lua to avoid the use of a few C99 features +** or Windows-specific features on Windows. +*/ +/* #define LUA_USE_C89 */ + + +/* +** By default, Lua on Windows use (some) specific Windows features +*/ +#if !defined(LUA_USE_C89) && defined(_WIN32) && !defined(_WIN32_WCE) +#define LUA_USE_WINDOWS /* enable goodies for regular Windows */ +#endif + + +#if defined(LUA_USE_WINDOWS) +#define LUA_DL_DLL /* enable support for DLL */ +#define LUA_USE_C89 /* broadly, Windows is C89 */ +#endif + + +#if defined(LUA_USE_LINUX) +#define LUA_USE_POSIX +#define LUA_USE_DLOPEN /* needs an extra library: -ldl */ +#endif + + +#if defined(LUA_USE_MACOSX) +#define LUA_USE_POSIX +#define LUA_USE_DLOPEN /* MacOS does not need -ldl */ +#endif + + +#if defined(LUA_USE_IOS) +#define LUA_USE_POSIX +#define LUA_USE_DLOPEN +#endif + + +/* +@@ LUAI_IS32INT is true iff 'int' has (at least) 32 bits. +*/ +#define LUAI_IS32INT ((UINT_MAX >> 30) >= 3) + +/* }================================================================== */ + + + +/* +** {================================================================== +** Configuration for Number types. These options should not be +** set externally, because any other code connected to Lua must +** use the same configuration. +** =================================================================== +*/ + +/* +@@ LUA_INT_TYPE defines the type for Lua integers. +@@ LUA_FLOAT_TYPE defines the type for Lua floats. +** Lua should work fine with any mix of these options supported +** by your C compiler. The usual configurations are 64-bit integers +** and 'double' (the default), 32-bit integers and 'float' (for +** restricted platforms), and 'long'/'double' (for C compilers not +** compliant with C99, which may not have support for 'long long'). +*/ + +/* predefined options for LUA_INT_TYPE */ +#define LUA_INT_INT 1 +#define LUA_INT_LONG 2 +#define LUA_INT_LONGLONG 3 + +/* predefined options for LUA_FLOAT_TYPE */ +#define LUA_FLOAT_FLOAT 1 +#define LUA_FLOAT_DOUBLE 2 +#define LUA_FLOAT_LONGDOUBLE 3 + + +/* Default configuration ('long long' and 'double', for 64-bit Lua) */ +#define LUA_INT_DEFAULT LUA_INT_LONGLONG +#define LUA_FLOAT_DEFAULT LUA_FLOAT_DOUBLE + + +/* +@@ LUA_32BITS enables Lua with 32-bit integers and 32-bit floats. +*/ +#define LUA_32BITS 0 + + +/* +@@ LUA_C89_NUMBERS ensures that Lua uses the largest types available for +** C89 ('long' and 'double'); Windows always has '__int64', so it does +** not need to use this case. +*/ +#if defined(LUA_USE_C89) && !defined(LUA_USE_WINDOWS) +#define LUA_C89_NUMBERS 1 +#else +#define LUA_C89_NUMBERS 0 +#endif + + +#if LUA_32BITS /* { */ +/* +** 32-bit integers and 'float' +*/ +#if LUAI_IS32INT /* use 'int' if big enough */ +#define LUA_INT_TYPE LUA_INT_INT +#else /* otherwise use 'long' */ +#define LUA_INT_TYPE LUA_INT_LONG +#endif +#define LUA_FLOAT_TYPE LUA_FLOAT_FLOAT + +#elif LUA_C89_NUMBERS /* }{ */ +/* +** largest types available for C89 ('long' and 'double') +*/ +#define LUA_INT_TYPE LUA_INT_LONG +#define LUA_FLOAT_TYPE LUA_FLOAT_DOUBLE + +#else /* }{ */ +/* use defaults */ + +#define LUA_INT_TYPE LUA_INT_DEFAULT +#define LUA_FLOAT_TYPE LUA_FLOAT_DEFAULT + +#endif /* } */ + + +/* }================================================================== */ + + + +/* +** {================================================================== +** Configuration for Paths. +** =================================================================== +*/ + +/* +** LUA_PATH_SEP is the character that separates templates in a path. +** LUA_PATH_MARK is the string that marks the substitution points in a +** template. +** LUA_EXEC_DIR in a Windows path is replaced by the executable's +** directory. +*/ +#define LUA_PATH_SEP ";" +#define LUA_PATH_MARK "?" +#define LUA_EXEC_DIR "!" + + +/* +@@ LUA_PATH_DEFAULT is the default path that Lua uses to look for +** Lua libraries. +@@ LUA_CPATH_DEFAULT is the default path that Lua uses to look for +** C libraries. +** CHANGE them if your machine has a non-conventional directory +** hierarchy or if you want to install your libraries in +** non-conventional directories. +*/ + +#define LUA_VDIR LUA_VERSION_MAJOR "." LUA_VERSION_MINOR +#if defined(_WIN32) /* { */ +/* +** In Windows, any exclamation mark ('!') in the path is replaced by the +** path of the directory of the executable file of the current process. +*/ +#define LUA_LDIR "!\\lua\\" +#define LUA_CDIR "!\\" +#define LUA_SHRDIR "!\\..\\share\\lua\\" LUA_VDIR "\\" + +#if !defined(LUA_PATH_DEFAULT) +#define LUA_PATH_DEFAULT \ + LUA_LDIR"?.lua;" LUA_LDIR"?\\init.lua;" \ + LUA_CDIR"?.lua;" LUA_CDIR"?\\init.lua;" \ + LUA_SHRDIR"?.lua;" LUA_SHRDIR"?\\init.lua;" \ + ".\\?.lua;" ".\\?\\init.lua" +#endif + +#if !defined(LUA_CPATH_DEFAULT) +#define LUA_CPATH_DEFAULT \ + LUA_CDIR"?.dll;" \ + LUA_CDIR"..\\lib\\lua\\" LUA_VDIR "\\?.dll;" \ + LUA_CDIR"loadall.dll;" ".\\?.dll" +#endif + +#else /* }{ */ + +#define LUA_ROOT "/usr/local/" +#define LUA_LDIR LUA_ROOT "share/lua/" LUA_VDIR "/" +#define LUA_CDIR LUA_ROOT "lib/lua/" LUA_VDIR "/" + +#if !defined(LUA_PATH_DEFAULT) +#define LUA_PATH_DEFAULT \ + LUA_LDIR"?.lua;" LUA_LDIR"?/init.lua;" \ + LUA_CDIR"?.lua;" LUA_CDIR"?/init.lua;" \ + "./?.lua;" "./?/init.lua" +#endif + +#if !defined(LUA_CPATH_DEFAULT) +#define LUA_CPATH_DEFAULT \ + LUA_CDIR"?.so;" LUA_CDIR"loadall.so;" "./?.so" +#endif + +#endif /* } */ + + +/* +@@ LUA_DIRSEP is the directory separator (for submodules). +** CHANGE it if your machine does not use "/" as the directory separator +** and is not Windows. (On Windows Lua automatically uses "\".) +*/ +#if !defined(LUA_DIRSEP) + +#if defined(_WIN32) +#define LUA_DIRSEP "\\" +#else +#define LUA_DIRSEP "/" +#endif + +#endif + +/* }================================================================== */ + + +/* +** {================================================================== +** Marks for exported symbols in the C code +** =================================================================== +*/ + +/* +@@ LUA_API is a mark for all core API functions. +@@ LUALIB_API is a mark for all auxiliary library functions. +@@ LUAMOD_API is a mark for all standard library opening functions. +** CHANGE them if you need to define those functions in some special way. +** For instance, if you want to create one Windows DLL with the core and +** the libraries, you may want to use the following definition (define +** LUA_BUILD_AS_DLL to get it). +*/ +#if defined(LUA_BUILD_AS_DLL) /* { */ + +#if defined(LUA_CORE) || defined(LUA_LIB) /* { */ +#define LUA_API __declspec(dllexport) +#else /* }{ */ +#define LUA_API __declspec(dllimport) +#endif /* } */ + +#else /* }{ */ + +#define LUA_API extern + +#endif /* } */ + + +/* +** More often than not the libs go together with the core. +*/ +#define LUALIB_API LUA_API +#define LUAMOD_API LUA_API + + +/* +@@ LUAI_FUNC is a mark for all extern functions that are not to be +** exported to outside modules. +@@ LUAI_DDEF and LUAI_DDEC are marks for all extern (const) variables, +** none of which to be exported to outside modules (LUAI_DDEF for +** definitions and LUAI_DDEC for declarations). +** CHANGE them if you need to mark them in some special way. Elf/gcc +** (versions 3.2 and later) mark them as "hidden" to optimize access +** when Lua is compiled as a shared library. Not all elf targets support +** this attribute. Unfortunately, gcc does not offer a way to check +** whether the target offers that support, and those without support +** give a warning about it. To avoid these warnings, change to the +** default definition. +*/ +#if defined(__GNUC__) && ((__GNUC__*100 + __GNUC_MINOR__) >= 302) && \ + defined(__ELF__) /* { */ +#define LUAI_FUNC __attribute__((visibility("internal"))) extern +#else /* }{ */ +#define LUAI_FUNC extern +#endif /* } */ + +#define LUAI_DDEC(dec) LUAI_FUNC dec +#define LUAI_DDEF /* empty */ + +/* }================================================================== */ + + +/* +** {================================================================== +** Compatibility with previous versions +** =================================================================== +*/ + +/* +@@ LUA_COMPAT_5_3 controls other macros for compatibility with Lua 5.3. +** You can define it to get all options, or change specific options +** to fit your specific needs. +*/ +#if defined(LUA_COMPAT_5_3) /* { */ + +/* +@@ LUA_COMPAT_MATHLIB controls the presence of several deprecated +** functions in the mathematical library. +** (These functions were already officially removed in 5.3; +** nevertheless they are still available here.) +*/ +#define LUA_COMPAT_MATHLIB + +/* +@@ LUA_COMPAT_APIINTCASTS controls the presence of macros for +** manipulating other integer types (lua_pushunsigned, lua_tounsigned, +** luaL_checkint, luaL_checklong, etc.) +** (These macros were also officially removed in 5.3, but they are still +** available here.) +*/ +#define LUA_COMPAT_APIINTCASTS + + +/* +@@ LUA_COMPAT_LT_LE controls the emulation of the '__le' metamethod +** using '__lt'. +*/ +#define LUA_COMPAT_LT_LE + + +/* +@@ The following macros supply trivial compatibility for some +** changes in the API. The macros themselves document how to +** change your code to avoid using them. +** (Once more, these macros were officially removed in 5.3, but they are +** still available here.) +*/ +#define lua_strlen(L,i) lua_rawlen(L, (i)) + +#define lua_objlen(L,i) lua_rawlen(L, (i)) + +#define lua_equal(L,idx1,idx2) lua_compare(L,(idx1),(idx2),LUA_OPEQ) +#define lua_lessthan(L,idx1,idx2) lua_compare(L,(idx1),(idx2),LUA_OPLT) + +#endif /* } */ + +/* }================================================================== */ + + + +/* +** {================================================================== +** Configuration for Numbers (low-level part). +** Change these definitions if no predefined LUA_FLOAT_* / LUA_INT_* +** satisfy your needs. +** =================================================================== +*/ + +/* +@@ LUAI_UACNUMBER is the result of a 'default argument promotion' +@@ over a floating number. +@@ l_floatatt(x) corrects float attribute 'x' to the proper float type +** by prefixing it with one of FLT/DBL/LDBL. +@@ LUA_NUMBER_FRMLEN is the length modifier for writing floats. +@@ LUA_NUMBER_FMT is the format for writing floats. +@@ lua_number2str converts a float to a string. +@@ l_mathop allows the addition of an 'l' or 'f' to all math operations. +@@ l_floor takes the floor of a float. +@@ lua_str2number converts a decimal numeral to a number. +*/ + + +/* The following definitions are good for most cases here */ + +#define l_floor(x) (l_mathop(floor)(x)) + +#define lua_number2str(s,sz,n) \ + l_sprintf((s), sz, LUA_NUMBER_FMT, (LUAI_UACNUMBER)(n)) + +/* +@@ lua_numbertointeger converts a float number with an integral value +** to an integer, or returns 0 if float is not within the range of +** a lua_Integer. (The range comparisons are tricky because of +** rounding. The tests here assume a two-complement representation, +** where MININTEGER always has an exact representation as a float; +** MAXINTEGER may not have one, and therefore its conversion to float +** may have an ill-defined value.) +*/ +#define lua_numbertointeger(n,p) \ + ((n) >= (LUA_NUMBER)(LUA_MININTEGER) && \ + (n) < -(LUA_NUMBER)(LUA_MININTEGER) && \ + (*(p) = (LUA_INTEGER)(n), 1)) + + +/* now the variable definitions */ + +#if LUA_FLOAT_TYPE == LUA_FLOAT_FLOAT /* { single float */ + +#define LUA_NUMBER float + +#define l_floatatt(n) (FLT_##n) + +#define LUAI_UACNUMBER double + +#define LUA_NUMBER_FRMLEN "" +#define LUA_NUMBER_FMT "%.7g" + +#define l_mathop(op) op##f + +#define lua_str2number(s,p) strtof((s), (p)) + + +#elif LUA_FLOAT_TYPE == LUA_FLOAT_LONGDOUBLE /* }{ long double */ + +#define LUA_NUMBER long double + +#define l_floatatt(n) (LDBL_##n) + +#define LUAI_UACNUMBER long double + +#define LUA_NUMBER_FRMLEN "L" +#define LUA_NUMBER_FMT "%.19Lg" + +#define l_mathop(op) op##l + +#define lua_str2number(s,p) strtold((s), (p)) + +#elif LUA_FLOAT_TYPE == LUA_FLOAT_DOUBLE /* }{ double */ + +#define LUA_NUMBER double + +#define l_floatatt(n) (DBL_##n) + +#define LUAI_UACNUMBER double + +#define LUA_NUMBER_FRMLEN "" +#define LUA_NUMBER_FMT "%.14g" + +#define l_mathop(op) op + +#define lua_str2number(s,p) strtod((s), (p)) + +#else /* }{ */ + +#error "numeric float type not defined" + +#endif /* } */ + + + +/* +@@ LUA_UNSIGNED is the unsigned version of LUA_INTEGER. +@@ LUAI_UACINT is the result of a 'default argument promotion' +@@ over a LUA_INTEGER. +@@ LUA_INTEGER_FRMLEN is the length modifier for reading/writing integers. +@@ LUA_INTEGER_FMT is the format for writing integers. +@@ LUA_MAXINTEGER is the maximum value for a LUA_INTEGER. +@@ LUA_MININTEGER is the minimum value for a LUA_INTEGER. +@@ LUA_MAXUNSIGNED is the maximum value for a LUA_UNSIGNED. +@@ lua_integer2str converts an integer to a string. +*/ + + +/* The following definitions are good for most cases here */ + +#define LUA_INTEGER_FMT "%" LUA_INTEGER_FRMLEN "d" + +#define LUAI_UACINT LUA_INTEGER + +#define lua_integer2str(s,sz,n) \ + l_sprintf((s), sz, LUA_INTEGER_FMT, (LUAI_UACINT)(n)) + +/* +** use LUAI_UACINT here to avoid problems with promotions (which +** can turn a comparison between unsigneds into a signed comparison) +*/ +#define LUA_UNSIGNED unsigned LUAI_UACINT + + +/* now the variable definitions */ + +#if LUA_INT_TYPE == LUA_INT_INT /* { int */ + +#define LUA_INTEGER int +#define LUA_INTEGER_FRMLEN "" + +#define LUA_MAXINTEGER INT_MAX +#define LUA_MININTEGER INT_MIN + +#define LUA_MAXUNSIGNED UINT_MAX + +#elif LUA_INT_TYPE == LUA_INT_LONG /* }{ long */ + +#define LUA_INTEGER long +#define LUA_INTEGER_FRMLEN "l" + +#define LUA_MAXINTEGER LONG_MAX +#define LUA_MININTEGER LONG_MIN + +#define LUA_MAXUNSIGNED ULONG_MAX + +#elif LUA_INT_TYPE == LUA_INT_LONGLONG /* }{ long long */ + +/* use presence of macro LLONG_MAX as proxy for C99 compliance */ +#if defined(LLONG_MAX) /* { */ +/* use ISO C99 stuff */ + +#define LUA_INTEGER long long +#define LUA_INTEGER_FRMLEN "ll" + +#define LUA_MAXINTEGER LLONG_MAX +#define LUA_MININTEGER LLONG_MIN + +#define LUA_MAXUNSIGNED ULLONG_MAX + +#elif defined(LUA_USE_WINDOWS) /* }{ */ +/* in Windows, can use specific Windows types */ + +#define LUA_INTEGER __int64 +#define LUA_INTEGER_FRMLEN "I64" + +#define LUA_MAXINTEGER _I64_MAX +#define LUA_MININTEGER _I64_MIN + +#define LUA_MAXUNSIGNED _UI64_MAX + +#else /* }{ */ + +#error "Compiler does not support 'long long'. Use option '-DLUA_32BITS' \ + or '-DLUA_C89_NUMBERS' (see file 'luaconf.h' for details)" + +#endif /* } */ + +#else /* }{ */ + +#error "numeric integer type not defined" + +#endif /* } */ + +/* }================================================================== */ + + +/* +** {================================================================== +** Dependencies with C99 and other C details +** =================================================================== +*/ + +/* +@@ l_sprintf is equivalent to 'snprintf' or 'sprintf' in C89. +** (All uses in Lua have only one format item.) +*/ +#if !defined(LUA_USE_C89) +#define l_sprintf(s,sz,f,i) snprintf(s,sz,f,i) +#else +#define l_sprintf(s,sz,f,i) ((void)(sz), sprintf(s,f,i)) +#endif + + +/* +@@ lua_strx2number converts a hexadecimal numeral to a number. +** In C99, 'strtod' does that conversion. Otherwise, you can +** leave 'lua_strx2number' undefined and Lua will provide its own +** implementation. +*/ +#if !defined(LUA_USE_C89) +#define lua_strx2number(s,p) lua_str2number(s,p) +#endif + + +/* +@@ lua_pointer2str converts a pointer to a readable string in a +** non-specified way. +*/ +#define lua_pointer2str(buff,sz,p) l_sprintf(buff,sz,"%p",p) + + +/* +@@ lua_number2strx converts a float to a hexadecimal numeral. +** In C99, 'sprintf' (with format specifiers '%a'/'%A') does that. +** Otherwise, you can leave 'lua_number2strx' undefined and Lua will +** provide its own implementation. +*/ +#if !defined(LUA_USE_C89) +#define lua_number2strx(L,b,sz,f,n) \ + ((void)L, l_sprintf(b,sz,f,(LUAI_UACNUMBER)(n))) +#endif + + +/* +** 'strtof' and 'opf' variants for math functions are not valid in +** C89. Otherwise, the macro 'HUGE_VALF' is a good proxy for testing the +** availability of these variants. ('math.h' is already included in +** all files that use these macros.) +*/ +#if defined(LUA_USE_C89) || (defined(HUGE_VAL) && !defined(HUGE_VALF)) +#undef l_mathop /* variants not available */ +#undef lua_str2number +#define l_mathop(op) (lua_Number)op /* no variant */ +#define lua_str2number(s,p) ((lua_Number)strtod((s), (p))) +#endif + + +/* +@@ LUA_KCONTEXT is the type of the context ('ctx') for continuation +** functions. It must be a numerical type; Lua will use 'intptr_t' if +** available, otherwise it will use 'ptrdiff_t' (the nearest thing to +** 'intptr_t' in C89) +*/ +#define LUA_KCONTEXT ptrdiff_t + +#if !defined(LUA_USE_C89) && defined(__STDC_VERSION__) && \ + __STDC_VERSION__ >= 199901L +#include +#if defined(INTPTR_MAX) /* even in C99 this type is optional */ +#undef LUA_KCONTEXT +#define LUA_KCONTEXT intptr_t +#endif +#endif + + +/* +@@ lua_getlocaledecpoint gets the locale "radix character" (decimal point). +** Change that if you do not want to use C locales. (Code using this +** macro must include the header 'locale.h'.) +*/ +#if !defined(lua_getlocaledecpoint) +#define lua_getlocaledecpoint() (localeconv()->decimal_point[0]) +#endif + + +/* +** macros to improve jump prediction, used mostly for error handling +** and debug facilities. (Some macros in the Lua API use these macros. +** Define LUA_NOBUILTIN if you do not want '__builtin_expect' in your +** code.) +*/ +#if !defined(luai_likely) + +#if defined(__GNUC__) && !defined(LUA_NOBUILTIN) +#define luai_likely(x) (__builtin_expect(((x) != 0), 1)) +#define luai_unlikely(x) (__builtin_expect(((x) != 0), 0)) +#else +#define luai_likely(x) (x) +#define luai_unlikely(x) (x) +#endif + +#endif + + +#if defined(LUA_CORE) || defined(LUA_LIB) +/* shorter names for Lua's own use */ +#define l_likely(x) luai_likely(x) +#define l_unlikely(x) luai_unlikely(x) +#endif + + + +/* }================================================================== */ + + +/* +** {================================================================== +** Language Variations +** ===================================================================== +*/ + +/* +@@ LUA_NOCVTN2S/LUA_NOCVTS2N control how Lua performs some +** coercions. Define LUA_NOCVTN2S to turn off automatic coercion from +** numbers to strings. Define LUA_NOCVTS2N to turn off automatic +** coercion from strings to numbers. +*/ +/* #define LUA_NOCVTN2S */ +/* #define LUA_NOCVTS2N */ + + +/* +@@ LUA_USE_APICHECK turns on several consistency checks on the C API. +** Define it as a help when debugging C code. +*/ +#if defined(LUA_USE_APICHECK) +#include +#define luai_apicheck(l,e) assert(e) +#endif + +/* }================================================================== */ + + +/* +** {================================================================== +** Macros that affect the API and must be stable (that is, must be the +** same when you compile Lua and when you compile code that links to +** Lua). +** ===================================================================== +*/ + +/* +@@ LUAI_MAXSTACK limits the size of the Lua stack. +** CHANGE it if you need a different limit. This limit is arbitrary; +** its only purpose is to stop Lua from consuming unlimited stack +** space (and to reserve some numbers for pseudo-indices). +** (It must fit into max(size_t)/32 and max(int)/2.) +*/ +#if LUAI_IS32INT +#define LUAI_MAXSTACK 1000000 +#else +#define LUAI_MAXSTACK 15000 +#endif + + +/* +@@ LUA_EXTRASPACE defines the size of a raw memory area associated with +** a Lua state with very fast access. +** CHANGE it if you need a different size. +*/ +#define LUA_EXTRASPACE (sizeof(void *)) + + +/* +@@ LUA_IDSIZE gives the maximum size for the description of the source +** of a function in debug information. +** CHANGE it if you want a different size. +*/ +#define LUA_IDSIZE 60 + + +/* +@@ LUAL_BUFFERSIZE is the initial buffer size used by the lauxlib +** buffer system. +*/ +#define LUAL_BUFFERSIZE ((int)(16 * sizeof(void*) * sizeof(lua_Number))) + + +/* +@@ LUAI_MAXALIGN defines fields that, when used in a union, ensure +** maximum alignment for the other items in that union. +*/ +#define LUAI_MAXALIGN lua_Number n; double u; void *s; lua_Integer i; long l + +/* }================================================================== */ + + + + + +/* =================================================================== */ + +/* +** Local configuration. You can use this space to add your redefinitions +** without modifying the main part of the file. +*/ + + + + + +#endif + diff --git a/06/lua-5.4.6/src/lualib.h b/06/lua-5.4.6/src/lualib.h new file mode 100644 index 0000000..2625529 --- /dev/null +++ b/06/lua-5.4.6/src/lualib.h @@ -0,0 +1,52 @@ +/* +** $Id: lualib.h $ +** Lua standard libraries +** See Copyright Notice in lua.h +*/ + + +#ifndef lualib_h +#define lualib_h + +#include "lua.h" + + +/* version suffix for environment variable names */ +#define LUA_VERSUFFIX "_" LUA_VERSION_MAJOR "_" LUA_VERSION_MINOR + + +LUAMOD_API int (luaopen_base) (lua_State *L); + +#define LUA_COLIBNAME "coroutine" +LUAMOD_API int (luaopen_coroutine) (lua_State *L); + +#define LUA_TABLIBNAME "table" +LUAMOD_API int (luaopen_table) (lua_State *L); + +#define LUA_IOLIBNAME "io" +LUAMOD_API int (luaopen_io) (lua_State *L); + +#define LUA_OSLIBNAME "os" +LUAMOD_API int (luaopen_os) (lua_State *L); + +#define LUA_STRLIBNAME "string" +LUAMOD_API int (luaopen_string) (lua_State *L); + +#define LUA_UTF8LIBNAME "utf8" +LUAMOD_API int (luaopen_utf8) (lua_State *L); + +#define LUA_MATHLIBNAME "math" +LUAMOD_API int (luaopen_math) (lua_State *L); + +#define LUA_DBLIBNAME "debug" +LUAMOD_API int (luaopen_debug) (lua_State *L); + +#define LUA_LOADLIBNAME "package" +LUAMOD_API int (luaopen_package) (lua_State *L); + + +/* open all previous libraries */ +LUALIB_API void (luaL_openlibs) (lua_State *L); + + +#endif diff --git a/06/lua-5.4.6/src/lundump.c b/06/lua-5.4.6/src/lundump.c new file mode 100644 index 0000000..02aed64 --- /dev/null +++ b/06/lua-5.4.6/src/lundump.c @@ -0,0 +1,335 @@ +/* +** $Id: lundump.c $ +** load precompiled Lua chunks +** See Copyright Notice in lua.h +*/ + +#define lundump_c +#define LUA_CORE + +#include "lprefix.h" + + +#include +#include + +#include "lua.h" + +#include "ldebug.h" +#include "ldo.h" +#include "lfunc.h" +#include "lmem.h" +#include "lobject.h" +#include "lstring.h" +#include "lundump.h" +#include "lzio.h" + + +#if !defined(luai_verifycode) +#define luai_verifycode(L,f) /* empty */ +#endif + + +typedef struct { + lua_State *L; + ZIO *Z; + const char *name; +} LoadState; + + +static l_noret error (LoadState *S, const char *why) { + luaO_pushfstring(S->L, "%s: bad binary format (%s)", S->name, why); + luaD_throw(S->L, LUA_ERRSYNTAX); +} + + +/* +** All high-level loads go through loadVector; you can change it to +** adapt to the endianness of the input +*/ +#define loadVector(S,b,n) loadBlock(S,b,(n)*sizeof((b)[0])) + +static void loadBlock (LoadState *S, void *b, size_t size) { + if (luaZ_read(S->Z, b, size) != 0) + error(S, "truncated chunk"); +} + + +#define loadVar(S,x) loadVector(S,&x,1) + + +static lu_byte loadByte (LoadState *S) { + int b = zgetc(S->Z); + if (b == EOZ) + error(S, "truncated chunk"); + return cast_byte(b); +} + + +static size_t loadUnsigned (LoadState *S, size_t limit) { + size_t x = 0; + int b; + limit >>= 7; + do { + b = loadByte(S); + if (x >= limit) + error(S, "integer overflow"); + x = (x << 7) | (b & 0x7f); + } while ((b & 0x80) == 0); + return x; +} + + +static size_t loadSize (LoadState *S) { + return loadUnsigned(S, ~(size_t)0); +} + + +static int loadInt (LoadState *S) { + return cast_int(loadUnsigned(S, INT_MAX)); +} + + +static lua_Number loadNumber (LoadState *S) { + lua_Number x; + loadVar(S, x); + return x; +} + + +static lua_Integer loadInteger (LoadState *S) { + lua_Integer x; + loadVar(S, x); + return x; +} + + +/* +** Load a nullable string into prototype 'p'. +*/ +static TString *loadStringN (LoadState *S, Proto *p) { + lua_State *L = S->L; + TString *ts; + size_t size = loadSize(S); + if (size == 0) /* no string? */ + return NULL; + else if (--size <= LUAI_MAXSHORTLEN) { /* short string? */ + char buff[LUAI_MAXSHORTLEN]; + loadVector(S, buff, size); /* load string into buffer */ + ts = luaS_newlstr(L, buff, size); /* create string */ + } + else { /* long string */ + ts = luaS_createlngstrobj(L, size); /* create string */ + setsvalue2s(L, L->top.p, ts); /* anchor it ('loadVector' can GC) */ + luaD_inctop(L); + loadVector(S, getstr(ts), size); /* load directly in final place */ + L->top.p--; /* pop string */ + } + luaC_objbarrier(L, p, ts); + return ts; +} + + +/* +** Load a non-nullable string into prototype 'p'. +*/ +static TString *loadString (LoadState *S, Proto *p) { + TString *st = loadStringN(S, p); + if (st == NULL) + error(S, "bad format for constant string"); + return st; +} + + +static void loadCode (LoadState *S, Proto *f) { + int n = loadInt(S); + f->code = luaM_newvectorchecked(S->L, n, Instruction); + f->sizecode = n; + loadVector(S, f->code, n); +} + + +static void loadFunction(LoadState *S, Proto *f, TString *psource); + + +static void loadConstants (LoadState *S, Proto *f) { + int i; + int n = loadInt(S); + f->k = luaM_newvectorchecked(S->L, n, TValue); + f->sizek = n; + for (i = 0; i < n; i++) + setnilvalue(&f->k[i]); + for (i = 0; i < n; i++) { + TValue *o = &f->k[i]; + int t = loadByte(S); + switch (t) { + case LUA_VNIL: + setnilvalue(o); + break; + case LUA_VFALSE: + setbfvalue(o); + break; + case LUA_VTRUE: + setbtvalue(o); + break; + case LUA_VNUMFLT: + setfltvalue(o, loadNumber(S)); + break; + case LUA_VNUMINT: + setivalue(o, loadInteger(S)); + break; + case LUA_VSHRSTR: + case LUA_VLNGSTR: + setsvalue2n(S->L, o, loadString(S, f)); + break; + default: lua_assert(0); + } + } +} + + +static void loadProtos (LoadState *S, Proto *f) { + int i; + int n = loadInt(S); + f->p = luaM_newvectorchecked(S->L, n, Proto *); + f->sizep = n; + for (i = 0; i < n; i++) + f->p[i] = NULL; + for (i = 0; i < n; i++) { + f->p[i] = luaF_newproto(S->L); + luaC_objbarrier(S->L, f, f->p[i]); + loadFunction(S, f->p[i], f->source); + } +} + + +/* +** Load the upvalues for a function. The names must be filled first, +** because the filling of the other fields can raise read errors and +** the creation of the error message can call an emergency collection; +** in that case all prototypes must be consistent for the GC. +*/ +static void loadUpvalues (LoadState *S, Proto *f) { + int i, n; + n = loadInt(S); + f->upvalues = luaM_newvectorchecked(S->L, n, Upvaldesc); + f->sizeupvalues = n; + for (i = 0; i < n; i++) /* make array valid for GC */ + f->upvalues[i].name = NULL; + for (i = 0; i < n; i++) { /* following calls can raise errors */ + f->upvalues[i].instack = loadByte(S); + f->upvalues[i].idx = loadByte(S); + f->upvalues[i].kind = loadByte(S); + } +} + + +static void loadDebug (LoadState *S, Proto *f) { + int i, n; + n = loadInt(S); + f->lineinfo = luaM_newvectorchecked(S->L, n, ls_byte); + f->sizelineinfo = n; + loadVector(S, f->lineinfo, n); + n = loadInt(S); + f->abslineinfo = luaM_newvectorchecked(S->L, n, AbsLineInfo); + f->sizeabslineinfo = n; + for (i = 0; i < n; i++) { + f->abslineinfo[i].pc = loadInt(S); + f->abslineinfo[i].line = loadInt(S); + } + n = loadInt(S); + f->locvars = luaM_newvectorchecked(S->L, n, LocVar); + f->sizelocvars = n; + for (i = 0; i < n; i++) + f->locvars[i].varname = NULL; + for (i = 0; i < n; i++) { + f->locvars[i].varname = loadStringN(S, f); + f->locvars[i].startpc = loadInt(S); + f->locvars[i].endpc = loadInt(S); + } + n = loadInt(S); + if (n != 0) /* does it have debug information? */ + n = f->sizeupvalues; /* must be this many */ + for (i = 0; i < n; i++) + f->upvalues[i].name = loadStringN(S, f); +} + + +static void loadFunction (LoadState *S, Proto *f, TString *psource) { + f->source = loadStringN(S, f); + if (f->source == NULL) /* no source in dump? */ + f->source = psource; /* reuse parent's source */ + f->linedefined = loadInt(S); + f->lastlinedefined = loadInt(S); + f->numparams = loadByte(S); + f->is_vararg = loadByte(S); + f->maxstacksize = loadByte(S); + loadCode(S, f); + loadConstants(S, f); + loadUpvalues(S, f); + loadProtos(S, f); + loadDebug(S, f); +} + + +static void checkliteral (LoadState *S, const char *s, const char *msg) { + char buff[sizeof(LUA_SIGNATURE) + sizeof(LUAC_DATA)]; /* larger than both */ + size_t len = strlen(s); + loadVector(S, buff, len); + if (memcmp(s, buff, len) != 0) + error(S, msg); +} + + +static void fchecksize (LoadState *S, size_t size, const char *tname) { + if (loadByte(S) != size) + error(S, luaO_pushfstring(S->L, "%s size mismatch", tname)); +} + + +#define checksize(S,t) fchecksize(S,sizeof(t),#t) + +static void checkHeader (LoadState *S) { + /* skip 1st char (already read and checked) */ + checkliteral(S, &LUA_SIGNATURE[1], "not a binary chunk"); + if (loadByte(S) != LUAC_VERSION) + error(S, "version mismatch"); + if (loadByte(S) != LUAC_FORMAT) + error(S, "format mismatch"); + checkliteral(S, LUAC_DATA, "corrupted chunk"); + checksize(S, Instruction); + checksize(S, lua_Integer); + checksize(S, lua_Number); + if (loadInteger(S) != LUAC_INT) + error(S, "integer format mismatch"); + if (loadNumber(S) != LUAC_NUM) + error(S, "float format mismatch"); +} + + +/* +** Load precompiled chunk. +*/ +LClosure *luaU_undump(lua_State *L, ZIO *Z, const char *name) { + LoadState S; + LClosure *cl; + if (*name == '@' || *name == '=') + S.name = name + 1; + else if (*name == LUA_SIGNATURE[0]) + S.name = "binary string"; + else + S.name = name; + S.L = L; + S.Z = Z; + checkHeader(&S); + cl = luaF_newLclosure(L, loadByte(&S)); + setclLvalue2s(L, L->top.p, cl); + luaD_inctop(L); + cl->p = luaF_newproto(L); + luaC_objbarrier(L, cl, cl->p); + loadFunction(&S, cl->p, NULL); + lua_assert(cl->nupvalues == cl->p->sizeupvalues); + luai_verifycode(L, cl->p); + return cl; +} + diff --git a/06/lua-5.4.6/src/lundump.h b/06/lua-5.4.6/src/lundump.h new file mode 100644 index 0000000..f3748a9 --- /dev/null +++ b/06/lua-5.4.6/src/lundump.h @@ -0,0 +1,36 @@ +/* +** $Id: lundump.h $ +** load precompiled Lua chunks +** See Copyright Notice in lua.h +*/ + +#ifndef lundump_h +#define lundump_h + +#include "llimits.h" +#include "lobject.h" +#include "lzio.h" + + +/* data to catch conversion errors */ +#define LUAC_DATA "\x19\x93\r\n\x1a\n" + +#define LUAC_INT 0x5678 +#define LUAC_NUM cast_num(370.5) + +/* +** Encode major-minor version in one byte, one nibble for each +*/ +#define MYINT(s) (s[0]-'0') /* assume one-digit numerals */ +#define LUAC_VERSION (MYINT(LUA_VERSION_MAJOR)*16+MYINT(LUA_VERSION_MINOR)) + +#define LUAC_FORMAT 0 /* this is the official format */ + +/* load one chunk; from lundump.c */ +LUAI_FUNC LClosure* luaU_undump (lua_State* L, ZIO* Z, const char* name); + +/* dump one chunk; from ldump.c */ +LUAI_FUNC int luaU_dump (lua_State* L, const Proto* f, lua_Writer w, + void* data, int strip); + +#endif diff --git a/06/lua-5.4.6/src/lutf8lib.c b/06/lua-5.4.6/src/lutf8lib.c new file mode 100644 index 0000000..3a5b9bc --- /dev/null +++ b/06/lua-5.4.6/src/lutf8lib.c @@ -0,0 +1,291 @@ +/* +** $Id: lutf8lib.c $ +** Standard library for UTF-8 manipulation +** See Copyright Notice in lua.h +*/ + +#define lutf8lib_c +#define LUA_LIB + +#include "lprefix.h" + + +#include +#include +#include +#include + +#include "lua.h" + +#include "lauxlib.h" +#include "lualib.h" + + +#define MAXUNICODE 0x10FFFFu + +#define MAXUTF 0x7FFFFFFFu + + +#define MSGInvalid "invalid UTF-8 code" + +/* +** Integer type for decoded UTF-8 values; MAXUTF needs 31 bits. +*/ +#if (UINT_MAX >> 30) >= 1 +typedef unsigned int utfint; +#else +typedef unsigned long utfint; +#endif + + +#define iscont(c) (((c) & 0xC0) == 0x80) +#define iscontp(p) iscont(*(p)) + + +/* from strlib */ +/* translate a relative string position: negative means back from end */ +static lua_Integer u_posrelat (lua_Integer pos, size_t len) { + if (pos >= 0) return pos; + else if (0u - (size_t)pos > len) return 0; + else return (lua_Integer)len + pos + 1; +} + + +/* +** Decode one UTF-8 sequence, returning NULL if byte sequence is +** invalid. The array 'limits' stores the minimum value for each +** sequence length, to check for overlong representations. Its first +** entry forces an error for non-ascii bytes with no continuation +** bytes (count == 0). +*/ +static const char *utf8_decode (const char *s, utfint *val, int strict) { + static const utfint limits[] = + {~(utfint)0, 0x80, 0x800, 0x10000u, 0x200000u, 0x4000000u}; + unsigned int c = (unsigned char)s[0]; + utfint res = 0; /* final result */ + if (c < 0x80) /* ascii? */ + res = c; + else { + int count = 0; /* to count number of continuation bytes */ + for (; c & 0x40; c <<= 1) { /* while it needs continuation bytes... */ + unsigned int cc = (unsigned char)s[++count]; /* read next byte */ + if (!iscont(cc)) /* not a continuation byte? */ + return NULL; /* invalid byte sequence */ + res = (res << 6) | (cc & 0x3F); /* add lower 6 bits from cont. byte */ + } + res |= ((utfint)(c & 0x7F) << (count * 5)); /* add first byte */ + if (count > 5 || res > MAXUTF || res < limits[count]) + return NULL; /* invalid byte sequence */ + s += count; /* skip continuation bytes read */ + } + if (strict) { + /* check for invalid code points; too large or surrogates */ + if (res > MAXUNICODE || (0xD800u <= res && res <= 0xDFFFu)) + return NULL; + } + if (val) *val = res; + return s + 1; /* +1 to include first byte */ +} + + +/* +** utf8len(s [, i [, j [, lax]]]) --> number of characters that +** start in the range [i,j], or nil + current position if 's' is not +** well formed in that interval +*/ +static int utflen (lua_State *L) { + lua_Integer n = 0; /* counter for the number of characters */ + size_t len; /* string length in bytes */ + const char *s = luaL_checklstring(L, 1, &len); + lua_Integer posi = u_posrelat(luaL_optinteger(L, 2, 1), len); + lua_Integer posj = u_posrelat(luaL_optinteger(L, 3, -1), len); + int lax = lua_toboolean(L, 4); + luaL_argcheck(L, 1 <= posi && --posi <= (lua_Integer)len, 2, + "initial position out of bounds"); + luaL_argcheck(L, --posj < (lua_Integer)len, 3, + "final position out of bounds"); + while (posi <= posj) { + const char *s1 = utf8_decode(s + posi, NULL, !lax); + if (s1 == NULL) { /* conversion error? */ + luaL_pushfail(L); /* return fail ... */ + lua_pushinteger(L, posi + 1); /* ... and current position */ + return 2; + } + posi = s1 - s; + n++; + } + lua_pushinteger(L, n); + return 1; +} + + +/* +** codepoint(s, [i, [j [, lax]]]) -> returns codepoints for all +** characters that start in the range [i,j] +*/ +static int codepoint (lua_State *L) { + size_t len; + const char *s = luaL_checklstring(L, 1, &len); + lua_Integer posi = u_posrelat(luaL_optinteger(L, 2, 1), len); + lua_Integer pose = u_posrelat(luaL_optinteger(L, 3, posi), len); + int lax = lua_toboolean(L, 4); + int n; + const char *se; + luaL_argcheck(L, posi >= 1, 2, "out of bounds"); + luaL_argcheck(L, pose <= (lua_Integer)len, 3, "out of bounds"); + if (posi > pose) return 0; /* empty interval; return no values */ + if (pose - posi >= INT_MAX) /* (lua_Integer -> int) overflow? */ + return luaL_error(L, "string slice too long"); + n = (int)(pose - posi) + 1; /* upper bound for number of returns */ + luaL_checkstack(L, n, "string slice too long"); + n = 0; /* count the number of returns */ + se = s + pose; /* string end */ + for (s += posi - 1; s < se;) { + utfint code; + s = utf8_decode(s, &code, !lax); + if (s == NULL) + return luaL_error(L, MSGInvalid); + lua_pushinteger(L, code); + n++; + } + return n; +} + + +static void pushutfchar (lua_State *L, int arg) { + lua_Unsigned code = (lua_Unsigned)luaL_checkinteger(L, arg); + luaL_argcheck(L, code <= MAXUTF, arg, "value out of range"); + lua_pushfstring(L, "%U", (long)code); +} + + +/* +** utfchar(n1, n2, ...) -> char(n1)..char(n2)... +*/ +static int utfchar (lua_State *L) { + int n = lua_gettop(L); /* number of arguments */ + if (n == 1) /* optimize common case of single char */ + pushutfchar(L, 1); + else { + int i; + luaL_Buffer b; + luaL_buffinit(L, &b); + for (i = 1; i <= n; i++) { + pushutfchar(L, i); + luaL_addvalue(&b); + } + luaL_pushresult(&b); + } + return 1; +} + + +/* +** offset(s, n, [i]) -> index where n-th character counting from +** position 'i' starts; 0 means character at 'i'. +*/ +static int byteoffset (lua_State *L) { + size_t len; + const char *s = luaL_checklstring(L, 1, &len); + lua_Integer n = luaL_checkinteger(L, 2); + lua_Integer posi = (n >= 0) ? 1 : len + 1; + posi = u_posrelat(luaL_optinteger(L, 3, posi), len); + luaL_argcheck(L, 1 <= posi && --posi <= (lua_Integer)len, 3, + "position out of bounds"); + if (n == 0) { + /* find beginning of current byte sequence */ + while (posi > 0 && iscontp(s + posi)) posi--; + } + else { + if (iscontp(s + posi)) + return luaL_error(L, "initial position is a continuation byte"); + if (n < 0) { + while (n < 0 && posi > 0) { /* move back */ + do { /* find beginning of previous character */ + posi--; + } while (posi > 0 && iscontp(s + posi)); + n++; + } + } + else { + n--; /* do not move for 1st character */ + while (n > 0 && posi < (lua_Integer)len) { + do { /* find beginning of next character */ + posi++; + } while (iscontp(s + posi)); /* (cannot pass final '\0') */ + n--; + } + } + } + if (n == 0) /* did it find given character? */ + lua_pushinteger(L, posi + 1); + else /* no such character */ + luaL_pushfail(L); + return 1; +} + + +static int iter_aux (lua_State *L, int strict) { + size_t len; + const char *s = luaL_checklstring(L, 1, &len); + lua_Unsigned n = (lua_Unsigned)lua_tointeger(L, 2); + if (n < len) { + while (iscontp(s + n)) n++; /* go to next character */ + } + if (n >= len) /* (also handles original 'n' being negative) */ + return 0; /* no more codepoints */ + else { + utfint code; + const char *next = utf8_decode(s + n, &code, strict); + if (next == NULL || iscontp(next)) + return luaL_error(L, MSGInvalid); + lua_pushinteger(L, n + 1); + lua_pushinteger(L, code); + return 2; + } +} + + +static int iter_auxstrict (lua_State *L) { + return iter_aux(L, 1); +} + +static int iter_auxlax (lua_State *L) { + return iter_aux(L, 0); +} + + +static int iter_codes (lua_State *L) { + int lax = lua_toboolean(L, 2); + const char *s = luaL_checkstring(L, 1); + luaL_argcheck(L, !iscontp(s), 1, MSGInvalid); + lua_pushcfunction(L, lax ? iter_auxlax : iter_auxstrict); + lua_pushvalue(L, 1); + lua_pushinteger(L, 0); + return 3; +} + + +/* pattern to match a single UTF-8 character */ +#define UTF8PATT "[\0-\x7F\xC2-\xFD][\x80-\xBF]*" + + +static const luaL_Reg funcs[] = { + {"offset", byteoffset}, + {"codepoint", codepoint}, + {"char", utfchar}, + {"len", utflen}, + {"codes", iter_codes}, + /* placeholders */ + {"charpattern", NULL}, + {NULL, NULL} +}; + + +LUAMOD_API int luaopen_utf8 (lua_State *L) { + luaL_newlib(L, funcs); + lua_pushlstring(L, UTF8PATT, sizeof(UTF8PATT)/sizeof(char) - 1); + lua_setfield(L, -2, "charpattern"); + return 1; +} + diff --git a/06/lua-5.4.6/src/lvm.c b/06/lua-5.4.6/src/lvm.c new file mode 100644 index 0000000..8493a77 --- /dev/null +++ b/06/lua-5.4.6/src/lvm.c @@ -0,0 +1,1901 @@ +/* +** $Id: lvm.c $ +** Lua virtual machine +** See Copyright Notice in lua.h +*/ + +#define lvm_c +#define LUA_CORE + +#include "lprefix.h" + +#include +#include +#include +#include +#include +#include + +#include "lua.h" + +#include "ldebug.h" +#include "ldo.h" +#include "lfunc.h" +#include "lgc.h" +#include "lobject.h" +#include "lopcodes.h" +#include "lstate.h" +#include "lstring.h" +#include "ltable.h" +#include "ltm.h" +#include "lvm.h" + + +/* +** By default, use jump tables in the main interpreter loop on gcc +** and compatible compilers. +*/ +#if !defined(LUA_USE_JUMPTABLE) +#if defined(__GNUC__) +#define LUA_USE_JUMPTABLE 1 +#else +#define LUA_USE_JUMPTABLE 0 +#endif +#endif + + + +/* limit for table tag-method chains (to avoid infinite loops) */ +#define MAXTAGLOOP 2000 + + +/* +** 'l_intfitsf' checks whether a given integer is in the range that +** can be converted to a float without rounding. Used in comparisons. +*/ + +/* number of bits in the mantissa of a float */ +#define NBM (l_floatatt(MANT_DIG)) + +/* +** Check whether some integers may not fit in a float, testing whether +** (maxinteger >> NBM) > 0. (That implies (1 << NBM) <= maxinteger.) +** (The shifts are done in parts, to avoid shifting by more than the size +** of an integer. In a worst case, NBM == 113 for long double and +** sizeof(long) == 32.) +*/ +#if ((((LUA_MAXINTEGER >> (NBM / 4)) >> (NBM / 4)) >> (NBM / 4)) \ + >> (NBM - (3 * (NBM / 4)))) > 0 + +/* limit for integers that fit in a float */ +#define MAXINTFITSF ((lua_Unsigned)1 << NBM) + +/* check whether 'i' is in the interval [-MAXINTFITSF, MAXINTFITSF] */ +#define l_intfitsf(i) ((MAXINTFITSF + l_castS2U(i)) <= (2 * MAXINTFITSF)) + +#else /* all integers fit in a float precisely */ + +#define l_intfitsf(i) 1 + +#endif + + +/* +** Try to convert a value from string to a number value. +** If the value is not a string or is a string not representing +** a valid numeral (or if coercions from strings to numbers +** are disabled via macro 'cvt2num'), do not modify 'result' +** and return 0. +*/ +static int l_strton (const TValue *obj, TValue *result) { + lua_assert(obj != result); + if (!cvt2num(obj)) /* is object not a string? */ + return 0; + else + return (luaO_str2num(svalue(obj), result) == vslen(obj) + 1); +} + + +/* +** Try to convert a value to a float. The float case is already handled +** by the macro 'tonumber'. +*/ +int luaV_tonumber_ (const TValue *obj, lua_Number *n) { + TValue v; + if (ttisinteger(obj)) { + *n = cast_num(ivalue(obj)); + return 1; + } + else if (l_strton(obj, &v)) { /* string coercible to number? */ + *n = nvalue(&v); /* convert result of 'luaO_str2num' to a float */ + return 1; + } + else + return 0; /* conversion failed */ +} + + +/* +** try to convert a float to an integer, rounding according to 'mode'. +*/ +int luaV_flttointeger (lua_Number n, lua_Integer *p, F2Imod mode) { + lua_Number f = l_floor(n); + if (n != f) { /* not an integral value? */ + if (mode == F2Ieq) return 0; /* fails if mode demands integral value */ + else if (mode == F2Iceil) /* needs ceil? */ + f += 1; /* convert floor to ceil (remember: n != f) */ + } + return lua_numbertointeger(f, p); +} + + +/* +** try to convert a value to an integer, rounding according to 'mode', +** without string coercion. +** ("Fast track" handled by macro 'tointegerns'.) +*/ +int luaV_tointegerns (const TValue *obj, lua_Integer *p, F2Imod mode) { + if (ttisfloat(obj)) + return luaV_flttointeger(fltvalue(obj), p, mode); + else if (ttisinteger(obj)) { + *p = ivalue(obj); + return 1; + } + else + return 0; +} + + +/* +** try to convert a value to an integer. +*/ +int luaV_tointeger (const TValue *obj, lua_Integer *p, F2Imod mode) { + TValue v; + if (l_strton(obj, &v)) /* does 'obj' point to a numerical string? */ + obj = &v; /* change it to point to its corresponding number */ + return luaV_tointegerns(obj, p, mode); +} + + +/* +** Try to convert a 'for' limit to an integer, preserving the semantics +** of the loop. Return true if the loop must not run; otherwise, '*p' +** gets the integer limit. +** (The following explanation assumes a positive step; it is valid for +** negative steps mutatis mutandis.) +** If the limit is an integer or can be converted to an integer, +** rounding down, that is the limit. +** Otherwise, check whether the limit can be converted to a float. If +** the float is too large, clip it to LUA_MAXINTEGER. If the float +** is too negative, the loop should not run, because any initial +** integer value is greater than such limit; so, the function returns +** true to signal that. (For this latter case, no integer limit would be +** correct; even a limit of LUA_MININTEGER would run the loop once for +** an initial value equal to LUA_MININTEGER.) +*/ +static int forlimit (lua_State *L, lua_Integer init, const TValue *lim, + lua_Integer *p, lua_Integer step) { + if (!luaV_tointeger(lim, p, (step < 0 ? F2Iceil : F2Ifloor))) { + /* not coercible to in integer */ + lua_Number flim; /* try to convert to float */ + if (!tonumber(lim, &flim)) /* cannot convert to float? */ + luaG_forerror(L, lim, "limit"); + /* else 'flim' is a float out of integer bounds */ + if (luai_numlt(0, flim)) { /* if it is positive, it is too large */ + if (step < 0) return 1; /* initial value must be less than it */ + *p = LUA_MAXINTEGER; /* truncate */ + } + else { /* it is less than min integer */ + if (step > 0) return 1; /* initial value must be greater than it */ + *p = LUA_MININTEGER; /* truncate */ + } + } + return (step > 0 ? init > *p : init < *p); /* not to run? */ +} + + +/* +** Prepare a numerical for loop (opcode OP_FORPREP). +** Return true to skip the loop. Otherwise, +** after preparation, stack will be as follows: +** ra : internal index (safe copy of the control variable) +** ra + 1 : loop counter (integer loops) or limit (float loops) +** ra + 2 : step +** ra + 3 : control variable +*/ +static int forprep (lua_State *L, StkId ra) { + TValue *pinit = s2v(ra); + TValue *plimit = s2v(ra + 1); + TValue *pstep = s2v(ra + 2); + if (ttisinteger(pinit) && ttisinteger(pstep)) { /* integer loop? */ + lua_Integer init = ivalue(pinit); + lua_Integer step = ivalue(pstep); + lua_Integer limit; + if (step == 0) + luaG_runerror(L, "'for' step is zero"); + setivalue(s2v(ra + 3), init); /* control variable */ + if (forlimit(L, init, plimit, &limit, step)) + return 1; /* skip the loop */ + else { /* prepare loop counter */ + lua_Unsigned count; + if (step > 0) { /* ascending loop? */ + count = l_castS2U(limit) - l_castS2U(init); + if (step != 1) /* avoid division in the too common case */ + count /= l_castS2U(step); + } + else { /* step < 0; descending loop */ + count = l_castS2U(init) - l_castS2U(limit); + /* 'step+1' avoids negating 'mininteger' */ + count /= l_castS2U(-(step + 1)) + 1u; + } + /* store the counter in place of the limit (which won't be + needed anymore) */ + setivalue(plimit, l_castU2S(count)); + } + } + else { /* try making all values floats */ + lua_Number init; lua_Number limit; lua_Number step; + if (l_unlikely(!tonumber(plimit, &limit))) + luaG_forerror(L, plimit, "limit"); + if (l_unlikely(!tonumber(pstep, &step))) + luaG_forerror(L, pstep, "step"); + if (l_unlikely(!tonumber(pinit, &init))) + luaG_forerror(L, pinit, "initial value"); + if (step == 0) + luaG_runerror(L, "'for' step is zero"); + if (luai_numlt(0, step) ? luai_numlt(limit, init) + : luai_numlt(init, limit)) + return 1; /* skip the loop */ + else { + /* make sure internal values are all floats */ + setfltvalue(plimit, limit); + setfltvalue(pstep, step); + setfltvalue(s2v(ra), init); /* internal index */ + setfltvalue(s2v(ra + 3), init); /* control variable */ + } + } + return 0; +} + + +/* +** Execute a step of a float numerical for loop, returning +** true iff the loop must continue. (The integer case is +** written online with opcode OP_FORLOOP, for performance.) +*/ +static int floatforloop (StkId ra) { + lua_Number step = fltvalue(s2v(ra + 2)); + lua_Number limit = fltvalue(s2v(ra + 1)); + lua_Number idx = fltvalue(s2v(ra)); /* internal index */ + idx = luai_numadd(L, idx, step); /* increment index */ + if (luai_numlt(0, step) ? luai_numle(idx, limit) + : luai_numle(limit, idx)) { + chgfltvalue(s2v(ra), idx); /* update internal index */ + setfltvalue(s2v(ra + 3), idx); /* and control variable */ + return 1; /* jump back */ + } + else + return 0; /* finish the loop */ +} + + +/* +** Finish the table access 'val = t[key]'. +** if 'slot' is NULL, 't' is not a table; otherwise, 'slot' points to +** t[k] entry (which must be empty). +*/ +void luaV_finishget (lua_State *L, const TValue *t, TValue *key, StkId val, + const TValue *slot) { + int loop; /* counter to avoid infinite loops */ + const TValue *tm; /* metamethod */ + for (loop = 0; loop < MAXTAGLOOP; loop++) { + if (slot == NULL) { /* 't' is not a table? */ + lua_assert(!ttistable(t)); + tm = luaT_gettmbyobj(L, t, TM_INDEX); + if (l_unlikely(notm(tm))) + luaG_typeerror(L, t, "index"); /* no metamethod */ + /* else will try the metamethod */ + } + else { /* 't' is a table */ + lua_assert(isempty(slot)); + tm = fasttm(L, hvalue(t)->metatable, TM_INDEX); /* table's metamethod */ + if (tm == NULL) { /* no metamethod? */ + setnilvalue(s2v(val)); /* result is nil */ + return; + } + /* else will try the metamethod */ + } + if (ttisfunction(tm)) { /* is metamethod a function? */ + luaT_callTMres(L, tm, t, key, val); /* call it */ + return; + } + t = tm; /* else try to access 'tm[key]' */ + if (luaV_fastget(L, t, key, slot, luaH_get)) { /* fast track? */ + setobj2s(L, val, slot); /* done */ + return; + } + /* else repeat (tail call 'luaV_finishget') */ + } + luaG_runerror(L, "'__index' chain too long; possible loop"); +} + + +/* +** Finish a table assignment 't[key] = val'. +** If 'slot' is NULL, 't' is not a table. Otherwise, 'slot' points +** to the entry 't[key]', or to a value with an absent key if there +** is no such entry. (The value at 'slot' must be empty, otherwise +** 'luaV_fastget' would have done the job.) +*/ +void luaV_finishset (lua_State *L, const TValue *t, TValue *key, + TValue *val, const TValue *slot) { + int loop; /* counter to avoid infinite loops */ + for (loop = 0; loop < MAXTAGLOOP; loop++) { + const TValue *tm; /* '__newindex' metamethod */ + if (slot != NULL) { /* is 't' a table? */ + Table *h = hvalue(t); /* save 't' table */ + lua_assert(isempty(slot)); /* slot must be empty */ + tm = fasttm(L, h->metatable, TM_NEWINDEX); /* get metamethod */ + if (tm == NULL) { /* no metamethod? */ + luaH_finishset(L, h, key, slot, val); /* set new value */ + invalidateTMcache(h); + luaC_barrierback(L, obj2gco(h), val); + return; + } + /* else will try the metamethod */ + } + else { /* not a table; check metamethod */ + tm = luaT_gettmbyobj(L, t, TM_NEWINDEX); + if (l_unlikely(notm(tm))) + luaG_typeerror(L, t, "index"); + } + /* try the metamethod */ + if (ttisfunction(tm)) { + luaT_callTM(L, tm, t, key, val); + return; + } + t = tm; /* else repeat assignment over 'tm' */ + if (luaV_fastget(L, t, key, slot, luaH_get)) { + luaV_finishfastset(L, t, slot, val); + return; /* done */ + } + /* else 'return luaV_finishset(L, t, key, val, slot)' (loop) */ + } + luaG_runerror(L, "'__newindex' chain too long; possible loop"); +} + + +/* +** Compare two strings 'ls' x 'rs', returning an integer less-equal- +** -greater than zero if 'ls' is less-equal-greater than 'rs'. +** The code is a little tricky because it allows '\0' in the strings +** and it uses 'strcoll' (to respect locales) for each segments +** of the strings. +*/ +static int l_strcmp (const TString *ls, const TString *rs) { + const char *l = getstr(ls); + size_t ll = tsslen(ls); + const char *r = getstr(rs); + size_t lr = tsslen(rs); + for (;;) { /* for each segment */ + int temp = strcoll(l, r); + if (temp != 0) /* not equal? */ + return temp; /* done */ + else { /* strings are equal up to a '\0' */ + size_t len = strlen(l); /* index of first '\0' in both strings */ + if (len == lr) /* 'rs' is finished? */ + return (len == ll) ? 0 : 1; /* check 'ls' */ + else if (len == ll) /* 'ls' is finished? */ + return -1; /* 'ls' is less than 'rs' ('rs' is not finished) */ + /* both strings longer than 'len'; go on comparing after the '\0' */ + len++; + l += len; ll -= len; r += len; lr -= len; + } + } +} + + +/* +** Check whether integer 'i' is less than float 'f'. If 'i' has an +** exact representation as a float ('l_intfitsf'), compare numbers as +** floats. Otherwise, use the equivalence 'i < f <=> i < ceil(f)'. +** If 'ceil(f)' is out of integer range, either 'f' is greater than +** all integers or less than all integers. +** (The test with 'l_intfitsf' is only for performance; the else +** case is correct for all values, but it is slow due to the conversion +** from float to int.) +** When 'f' is NaN, comparisons must result in false. +*/ +l_sinline int LTintfloat (lua_Integer i, lua_Number f) { + if (l_intfitsf(i)) + return luai_numlt(cast_num(i), f); /* compare them as floats */ + else { /* i < f <=> i < ceil(f) */ + lua_Integer fi; + if (luaV_flttointeger(f, &fi, F2Iceil)) /* fi = ceil(f) */ + return i < fi; /* compare them as integers */ + else /* 'f' is either greater or less than all integers */ + return f > 0; /* greater? */ + } +} + + +/* +** Check whether integer 'i' is less than or equal to float 'f'. +** See comments on previous function. +*/ +l_sinline int LEintfloat (lua_Integer i, lua_Number f) { + if (l_intfitsf(i)) + return luai_numle(cast_num(i), f); /* compare them as floats */ + else { /* i <= f <=> i <= floor(f) */ + lua_Integer fi; + if (luaV_flttointeger(f, &fi, F2Ifloor)) /* fi = floor(f) */ + return i <= fi; /* compare them as integers */ + else /* 'f' is either greater or less than all integers */ + return f > 0; /* greater? */ + } +} + + +/* +** Check whether float 'f' is less than integer 'i'. +** See comments on previous function. +*/ +l_sinline int LTfloatint (lua_Number f, lua_Integer i) { + if (l_intfitsf(i)) + return luai_numlt(f, cast_num(i)); /* compare them as floats */ + else { /* f < i <=> floor(f) < i */ + lua_Integer fi; + if (luaV_flttointeger(f, &fi, F2Ifloor)) /* fi = floor(f) */ + return fi < i; /* compare them as integers */ + else /* 'f' is either greater or less than all integers */ + return f < 0; /* less? */ + } +} + + +/* +** Check whether float 'f' is less than or equal to integer 'i'. +** See comments on previous function. +*/ +l_sinline int LEfloatint (lua_Number f, lua_Integer i) { + if (l_intfitsf(i)) + return luai_numle(f, cast_num(i)); /* compare them as floats */ + else { /* f <= i <=> ceil(f) <= i */ + lua_Integer fi; + if (luaV_flttointeger(f, &fi, F2Iceil)) /* fi = ceil(f) */ + return fi <= i; /* compare them as integers */ + else /* 'f' is either greater or less than all integers */ + return f < 0; /* less? */ + } +} + + +/* +** Return 'l < r', for numbers. +*/ +l_sinline int LTnum (const TValue *l, const TValue *r) { + lua_assert(ttisnumber(l) && ttisnumber(r)); + if (ttisinteger(l)) { + lua_Integer li = ivalue(l); + if (ttisinteger(r)) + return li < ivalue(r); /* both are integers */ + else /* 'l' is int and 'r' is float */ + return LTintfloat(li, fltvalue(r)); /* l < r ? */ + } + else { + lua_Number lf = fltvalue(l); /* 'l' must be float */ + if (ttisfloat(r)) + return luai_numlt(lf, fltvalue(r)); /* both are float */ + else /* 'l' is float and 'r' is int */ + return LTfloatint(lf, ivalue(r)); + } +} + + +/* +** Return 'l <= r', for numbers. +*/ +l_sinline int LEnum (const TValue *l, const TValue *r) { + lua_assert(ttisnumber(l) && ttisnumber(r)); + if (ttisinteger(l)) { + lua_Integer li = ivalue(l); + if (ttisinteger(r)) + return li <= ivalue(r); /* both are integers */ + else /* 'l' is int and 'r' is float */ + return LEintfloat(li, fltvalue(r)); /* l <= r ? */ + } + else { + lua_Number lf = fltvalue(l); /* 'l' must be float */ + if (ttisfloat(r)) + return luai_numle(lf, fltvalue(r)); /* both are float */ + else /* 'l' is float and 'r' is int */ + return LEfloatint(lf, ivalue(r)); + } +} + + +/* +** return 'l < r' for non-numbers. +*/ +static int lessthanothers (lua_State *L, const TValue *l, const TValue *r) { + lua_assert(!ttisnumber(l) || !ttisnumber(r)); + if (ttisstring(l) && ttisstring(r)) /* both are strings? */ + return l_strcmp(tsvalue(l), tsvalue(r)) < 0; + else + return luaT_callorderTM(L, l, r, TM_LT); +} + + +/* +** Main operation less than; return 'l < r'. +*/ +int luaV_lessthan (lua_State *L, const TValue *l, const TValue *r) { + if (ttisnumber(l) && ttisnumber(r)) /* both operands are numbers? */ + return LTnum(l, r); + else return lessthanothers(L, l, r); +} + + +/* +** return 'l <= r' for non-numbers. +*/ +static int lessequalothers (lua_State *L, const TValue *l, const TValue *r) { + lua_assert(!ttisnumber(l) || !ttisnumber(r)); + if (ttisstring(l) && ttisstring(r)) /* both are strings? */ + return l_strcmp(tsvalue(l), tsvalue(r)) <= 0; + else + return luaT_callorderTM(L, l, r, TM_LE); +} + + +/* +** Main operation less than or equal to; return 'l <= r'. +*/ +int luaV_lessequal (lua_State *L, const TValue *l, const TValue *r) { + if (ttisnumber(l) && ttisnumber(r)) /* both operands are numbers? */ + return LEnum(l, r); + else return lessequalothers(L, l, r); +} + + +/* +** Main operation for equality of Lua values; return 't1 == t2'. +** L == NULL means raw equality (no metamethods) +*/ +int luaV_equalobj (lua_State *L, const TValue *t1, const TValue *t2) { + const TValue *tm; + if (ttypetag(t1) != ttypetag(t2)) { /* not the same variant? */ + if (ttype(t1) != ttype(t2) || ttype(t1) != LUA_TNUMBER) + return 0; /* only numbers can be equal with different variants */ + else { /* two numbers with different variants */ + /* One of them is an integer. If the other does not have an + integer value, they cannot be equal; otherwise, compare their + integer values. */ + lua_Integer i1, i2; + return (luaV_tointegerns(t1, &i1, F2Ieq) && + luaV_tointegerns(t2, &i2, F2Ieq) && + i1 == i2); + } + } + /* values have same type and same variant */ + switch (ttypetag(t1)) { + case LUA_VNIL: case LUA_VFALSE: case LUA_VTRUE: return 1; + case LUA_VNUMINT: return (ivalue(t1) == ivalue(t2)); + case LUA_VNUMFLT: return luai_numeq(fltvalue(t1), fltvalue(t2)); + case LUA_VLIGHTUSERDATA: return pvalue(t1) == pvalue(t2); + case LUA_VLCF: return fvalue(t1) == fvalue(t2); + case LUA_VSHRSTR: return eqshrstr(tsvalue(t1), tsvalue(t2)); + case LUA_VLNGSTR: return luaS_eqlngstr(tsvalue(t1), tsvalue(t2)); + case LUA_VUSERDATA: { + if (uvalue(t1) == uvalue(t2)) return 1; + else if (L == NULL) return 0; + tm = fasttm(L, uvalue(t1)->metatable, TM_EQ); + if (tm == NULL) + tm = fasttm(L, uvalue(t2)->metatable, TM_EQ); + break; /* will try TM */ + } + case LUA_VTABLE: { + if (hvalue(t1) == hvalue(t2)) return 1; + else if (L == NULL) return 0; + tm = fasttm(L, hvalue(t1)->metatable, TM_EQ); + if (tm == NULL) + tm = fasttm(L, hvalue(t2)->metatable, TM_EQ); + break; /* will try TM */ + } + default: + return gcvalue(t1) == gcvalue(t2); + } + if (tm == NULL) /* no TM? */ + return 0; /* objects are different */ + else { + luaT_callTMres(L, tm, t1, t2, L->top.p); /* call TM */ + return !l_isfalse(s2v(L->top.p)); + } +} + + +/* macro used by 'luaV_concat' to ensure that element at 'o' is a string */ +#define tostring(L,o) \ + (ttisstring(o) || (cvt2str(o) && (luaO_tostring(L, o), 1))) + +#define isemptystr(o) (ttisshrstring(o) && tsvalue(o)->shrlen == 0) + +/* copy strings in stack from top - n up to top - 1 to buffer */ +static void copy2buff (StkId top, int n, char *buff) { + size_t tl = 0; /* size already copied */ + do { + size_t l = vslen(s2v(top - n)); /* length of string being copied */ + memcpy(buff + tl, svalue(s2v(top - n)), l * sizeof(char)); + tl += l; + } while (--n > 0); +} + + +/* +** Main operation for concatenation: concat 'total' values in the stack, +** from 'L->top.p - total' up to 'L->top.p - 1'. +*/ +void luaV_concat (lua_State *L, int total) { + if (total == 1) + return; /* "all" values already concatenated */ + do { + StkId top = L->top.p; + int n = 2; /* number of elements handled in this pass (at least 2) */ + if (!(ttisstring(s2v(top - 2)) || cvt2str(s2v(top - 2))) || + !tostring(L, s2v(top - 1))) + luaT_tryconcatTM(L); /* may invalidate 'top' */ + else if (isemptystr(s2v(top - 1))) /* second operand is empty? */ + cast_void(tostring(L, s2v(top - 2))); /* result is first operand */ + else if (isemptystr(s2v(top - 2))) { /* first operand is empty string? */ + setobjs2s(L, top - 2, top - 1); /* result is second op. */ + } + else { + /* at least two non-empty string values; get as many as possible */ + size_t tl = vslen(s2v(top - 1)); + TString *ts; + /* collect total length and number of strings */ + for (n = 1; n < total && tostring(L, s2v(top - n - 1)); n++) { + size_t l = vslen(s2v(top - n - 1)); + if (l_unlikely(l >= (MAX_SIZE/sizeof(char)) - tl)) { + L->top.p = top - total; /* pop strings to avoid wasting stack */ + luaG_runerror(L, "string length overflow"); + } + tl += l; + } + if (tl <= LUAI_MAXSHORTLEN) { /* is result a short string? */ + char buff[LUAI_MAXSHORTLEN]; + copy2buff(top, n, buff); /* copy strings to buffer */ + ts = luaS_newlstr(L, buff, tl); + } + else { /* long string; copy strings directly to final result */ + ts = luaS_createlngstrobj(L, tl); + copy2buff(top, n, getstr(ts)); + } + setsvalue2s(L, top - n, ts); /* create result */ + } + total -= n - 1; /* got 'n' strings to create one new */ + L->top.p -= n - 1; /* popped 'n' strings and pushed one */ + } while (total > 1); /* repeat until only 1 result left */ +} + + +/* +** Main operation 'ra = #rb'. +*/ +void luaV_objlen (lua_State *L, StkId ra, const TValue *rb) { + const TValue *tm; + switch (ttypetag(rb)) { + case LUA_VTABLE: { + Table *h = hvalue(rb); + tm = fasttm(L, h->metatable, TM_LEN); + if (tm) break; /* metamethod? break switch to call it */ + setivalue(s2v(ra), luaH_getn(h)); /* else primitive len */ + return; + } + case LUA_VSHRSTR: { + setivalue(s2v(ra), tsvalue(rb)->shrlen); + return; + } + case LUA_VLNGSTR: { + setivalue(s2v(ra), tsvalue(rb)->u.lnglen); + return; + } + default: { /* try metamethod */ + tm = luaT_gettmbyobj(L, rb, TM_LEN); + if (l_unlikely(notm(tm))) /* no metamethod? */ + luaG_typeerror(L, rb, "get length of"); + break; + } + } + luaT_callTMres(L, tm, rb, rb, ra); +} + + +/* +** Integer division; return 'm // n', that is, floor(m/n). +** C division truncates its result (rounds towards zero). +** 'floor(q) == trunc(q)' when 'q >= 0' or when 'q' is integer, +** otherwise 'floor(q) == trunc(q) - 1'. +*/ +lua_Integer luaV_idiv (lua_State *L, lua_Integer m, lua_Integer n) { + if (l_unlikely(l_castS2U(n) + 1u <= 1u)) { /* special cases: -1 or 0 */ + if (n == 0) + luaG_runerror(L, "attempt to divide by zero"); + return intop(-, 0, m); /* n==-1; avoid overflow with 0x80000...//-1 */ + } + else { + lua_Integer q = m / n; /* perform C division */ + if ((m ^ n) < 0 && m % n != 0) /* 'm/n' would be negative non-integer? */ + q -= 1; /* correct result for different rounding */ + return q; + } +} + + +/* +** Integer modulus; return 'm % n'. (Assume that C '%' with +** negative operands follows C99 behavior. See previous comment +** about luaV_idiv.) +*/ +lua_Integer luaV_mod (lua_State *L, lua_Integer m, lua_Integer n) { + if (l_unlikely(l_castS2U(n) + 1u <= 1u)) { /* special cases: -1 or 0 */ + if (n == 0) + luaG_runerror(L, "attempt to perform 'n%%0'"); + return 0; /* m % -1 == 0; avoid overflow with 0x80000...%-1 */ + } + else { + lua_Integer r = m % n; + if (r != 0 && (r ^ n) < 0) /* 'm/n' would be non-integer negative? */ + r += n; /* correct result for different rounding */ + return r; + } +} + + +/* +** Float modulus +*/ +lua_Number luaV_modf (lua_State *L, lua_Number m, lua_Number n) { + lua_Number r; + luai_nummod(L, m, n, r); + return r; +} + + +/* number of bits in an integer */ +#define NBITS cast_int(sizeof(lua_Integer) * CHAR_BIT) + + +/* +** Shift left operation. (Shift right just negates 'y'.) +*/ +lua_Integer luaV_shiftl (lua_Integer x, lua_Integer y) { + if (y < 0) { /* shift right? */ + if (y <= -NBITS) return 0; + else return intop(>>, x, -y); + } + else { /* shift left */ + if (y >= NBITS) return 0; + else return intop(<<, x, y); + } +} + + +/* +** create a new Lua closure, push it in the stack, and initialize +** its upvalues. +*/ +static void pushclosure (lua_State *L, Proto *p, UpVal **encup, StkId base, + StkId ra) { + int nup = p->sizeupvalues; + Upvaldesc *uv = p->upvalues; + int i; + LClosure *ncl = luaF_newLclosure(L, nup); + ncl->p = p; + setclLvalue2s(L, ra, ncl); /* anchor new closure in stack */ + for (i = 0; i < nup; i++) { /* fill in its upvalues */ + if (uv[i].instack) /* upvalue refers to local variable? */ + ncl->upvals[i] = luaF_findupval(L, base + uv[i].idx); + else /* get upvalue from enclosing function */ + ncl->upvals[i] = encup[uv[i].idx]; + luaC_objbarrier(L, ncl, ncl->upvals[i]); + } +} + + +/* +** finish execution of an opcode interrupted by a yield +*/ +void luaV_finishOp (lua_State *L) { + CallInfo *ci = L->ci; + StkId base = ci->func.p + 1; + Instruction inst = *(ci->u.l.savedpc - 1); /* interrupted instruction */ + OpCode op = GET_OPCODE(inst); + switch (op) { /* finish its execution */ + case OP_MMBIN: case OP_MMBINI: case OP_MMBINK: { + setobjs2s(L, base + GETARG_A(*(ci->u.l.savedpc - 2)), --L->top.p); + break; + } + case OP_UNM: case OP_BNOT: case OP_LEN: + case OP_GETTABUP: case OP_GETTABLE: case OP_GETI: + case OP_GETFIELD: case OP_SELF: { + setobjs2s(L, base + GETARG_A(inst), --L->top.p); + break; + } + case OP_LT: case OP_LE: + case OP_LTI: case OP_LEI: + case OP_GTI: case OP_GEI: + case OP_EQ: { /* note that 'OP_EQI'/'OP_EQK' cannot yield */ + int res = !l_isfalse(s2v(L->top.p - 1)); + L->top.p--; +#if defined(LUA_COMPAT_LT_LE) + if (ci->callstatus & CIST_LEQ) { /* "<=" using "<" instead? */ + ci->callstatus ^= CIST_LEQ; /* clear mark */ + res = !res; /* negate result */ + } +#endif + lua_assert(GET_OPCODE(*ci->u.l.savedpc) == OP_JMP); + if (res != GETARG_k(inst)) /* condition failed? */ + ci->u.l.savedpc++; /* skip jump instruction */ + break; + } + case OP_CONCAT: { + StkId top = L->top.p - 1; /* top when 'luaT_tryconcatTM' was called */ + int a = GETARG_A(inst); /* first element to concatenate */ + int total = cast_int(top - 1 - (base + a)); /* yet to concatenate */ + setobjs2s(L, top - 2, top); /* put TM result in proper position */ + L->top.p = top - 1; /* top is one after last element (at top-2) */ + luaV_concat(L, total); /* concat them (may yield again) */ + break; + } + case OP_CLOSE: { /* yielded closing variables */ + ci->u.l.savedpc--; /* repeat instruction to close other vars. */ + break; + } + case OP_RETURN: { /* yielded closing variables */ + StkId ra = base + GETARG_A(inst); + /* adjust top to signal correct number of returns, in case the + return is "up to top" ('isIT') */ + L->top.p = ra + ci->u2.nres; + /* repeat instruction to close other vars. and complete the return */ + ci->u.l.savedpc--; + break; + } + default: { + /* only these other opcodes can yield */ + lua_assert(op == OP_TFORCALL || op == OP_CALL || + op == OP_TAILCALL || op == OP_SETTABUP || op == OP_SETTABLE || + op == OP_SETI || op == OP_SETFIELD); + break; + } + } +} + + + + +/* +** {================================================================== +** Macros for arithmetic/bitwise/comparison opcodes in 'luaV_execute' +** =================================================================== +*/ + +#define l_addi(L,a,b) intop(+, a, b) +#define l_subi(L,a,b) intop(-, a, b) +#define l_muli(L,a,b) intop(*, a, b) +#define l_band(a,b) intop(&, a, b) +#define l_bor(a,b) intop(|, a, b) +#define l_bxor(a,b) intop(^, a, b) + +#define l_lti(a,b) (a < b) +#define l_lei(a,b) (a <= b) +#define l_gti(a,b) (a > b) +#define l_gei(a,b) (a >= b) + + +/* +** Arithmetic operations with immediate operands. 'iop' is the integer +** operation, 'fop' is the float operation. +*/ +#define op_arithI(L,iop,fop) { \ + StkId ra = RA(i); \ + TValue *v1 = vRB(i); \ + int imm = GETARG_sC(i); \ + if (ttisinteger(v1)) { \ + lua_Integer iv1 = ivalue(v1); \ + pc++; setivalue(s2v(ra), iop(L, iv1, imm)); \ + } \ + else if (ttisfloat(v1)) { \ + lua_Number nb = fltvalue(v1); \ + lua_Number fimm = cast_num(imm); \ + pc++; setfltvalue(s2v(ra), fop(L, nb, fimm)); \ + }} + + +/* +** Auxiliary function for arithmetic operations over floats and others +** with two register operands. +*/ +#define op_arithf_aux(L,v1,v2,fop) { \ + lua_Number n1; lua_Number n2; \ + if (tonumberns(v1, n1) && tonumberns(v2, n2)) { \ + pc++; setfltvalue(s2v(ra), fop(L, n1, n2)); \ + }} + + +/* +** Arithmetic operations over floats and others with register operands. +*/ +#define op_arithf(L,fop) { \ + StkId ra = RA(i); \ + TValue *v1 = vRB(i); \ + TValue *v2 = vRC(i); \ + op_arithf_aux(L, v1, v2, fop); } + + +/* +** Arithmetic operations with K operands for floats. +*/ +#define op_arithfK(L,fop) { \ + StkId ra = RA(i); \ + TValue *v1 = vRB(i); \ + TValue *v2 = KC(i); lua_assert(ttisnumber(v2)); \ + op_arithf_aux(L, v1, v2, fop); } + + +/* +** Arithmetic operations over integers and floats. +*/ +#define op_arith_aux(L,v1,v2,iop,fop) { \ + StkId ra = RA(i); \ + if (ttisinteger(v1) && ttisinteger(v2)) { \ + lua_Integer i1 = ivalue(v1); lua_Integer i2 = ivalue(v2); \ + pc++; setivalue(s2v(ra), iop(L, i1, i2)); \ + } \ + else op_arithf_aux(L, v1, v2, fop); } + + +/* +** Arithmetic operations with register operands. +*/ +#define op_arith(L,iop,fop) { \ + TValue *v1 = vRB(i); \ + TValue *v2 = vRC(i); \ + op_arith_aux(L, v1, v2, iop, fop); } + + +/* +** Arithmetic operations with K operands. +*/ +#define op_arithK(L,iop,fop) { \ + TValue *v1 = vRB(i); \ + TValue *v2 = KC(i); lua_assert(ttisnumber(v2)); \ + op_arith_aux(L, v1, v2, iop, fop); } + + +/* +** Bitwise operations with constant operand. +*/ +#define op_bitwiseK(L,op) { \ + StkId ra = RA(i); \ + TValue *v1 = vRB(i); \ + TValue *v2 = KC(i); \ + lua_Integer i1; \ + lua_Integer i2 = ivalue(v2); \ + if (tointegerns(v1, &i1)) { \ + pc++; setivalue(s2v(ra), op(i1, i2)); \ + }} + + +/* +** Bitwise operations with register operands. +*/ +#define op_bitwise(L,op) { \ + StkId ra = RA(i); \ + TValue *v1 = vRB(i); \ + TValue *v2 = vRC(i); \ + lua_Integer i1; lua_Integer i2; \ + if (tointegerns(v1, &i1) && tointegerns(v2, &i2)) { \ + pc++; setivalue(s2v(ra), op(i1, i2)); \ + }} + + +/* +** Order operations with register operands. 'opn' actually works +** for all numbers, but the fast track improves performance for +** integers. +*/ +#define op_order(L,opi,opn,other) { \ + StkId ra = RA(i); \ + int cond; \ + TValue *rb = vRB(i); \ + if (ttisinteger(s2v(ra)) && ttisinteger(rb)) { \ + lua_Integer ia = ivalue(s2v(ra)); \ + lua_Integer ib = ivalue(rb); \ + cond = opi(ia, ib); \ + } \ + else if (ttisnumber(s2v(ra)) && ttisnumber(rb)) \ + cond = opn(s2v(ra), rb); \ + else \ + Protect(cond = other(L, s2v(ra), rb)); \ + docondjump(); } + + +/* +** Order operations with immediate operand. (Immediate operand is +** always small enough to have an exact representation as a float.) +*/ +#define op_orderI(L,opi,opf,inv,tm) { \ + StkId ra = RA(i); \ + int cond; \ + int im = GETARG_sB(i); \ + if (ttisinteger(s2v(ra))) \ + cond = opi(ivalue(s2v(ra)), im); \ + else if (ttisfloat(s2v(ra))) { \ + lua_Number fa = fltvalue(s2v(ra)); \ + lua_Number fim = cast_num(im); \ + cond = opf(fa, fim); \ + } \ + else { \ + int isf = GETARG_C(i); \ + Protect(cond = luaT_callorderiTM(L, s2v(ra), im, inv, isf, tm)); \ + } \ + docondjump(); } + +/* }================================================================== */ + + +/* +** {================================================================== +** Function 'luaV_execute': main interpreter loop +** =================================================================== +*/ + +/* +** some macros for common tasks in 'luaV_execute' +*/ + + +#define RA(i) (base+GETARG_A(i)) +#define RB(i) (base+GETARG_B(i)) +#define vRB(i) s2v(RB(i)) +#define KB(i) (k+GETARG_B(i)) +#define RC(i) (base+GETARG_C(i)) +#define vRC(i) s2v(RC(i)) +#define KC(i) (k+GETARG_C(i)) +#define RKC(i) ((TESTARG_k(i)) ? k + GETARG_C(i) : s2v(base + GETARG_C(i))) + + + +#define updatetrap(ci) (trap = ci->u.l.trap) + +#define updatebase(ci) (base = ci->func.p + 1) + + +#define updatestack(ci) \ + { if (l_unlikely(trap)) { updatebase(ci); ra = RA(i); } } + + +/* +** Execute a jump instruction. The 'updatetrap' allows signals to stop +** tight loops. (Without it, the local copy of 'trap' could never change.) +*/ +#define dojump(ci,i,e) { pc += GETARG_sJ(i) + e; updatetrap(ci); } + + +/* for test instructions, execute the jump instruction that follows it */ +#define donextjump(ci) { Instruction ni = *pc; dojump(ci, ni, 1); } + +/* +** do a conditional jump: skip next instruction if 'cond' is not what +** was expected (parameter 'k'), else do next instruction, which must +** be a jump. +*/ +#define docondjump() if (cond != GETARG_k(i)) pc++; else donextjump(ci); + + +/* +** Correct global 'pc'. +*/ +#define savepc(L) (ci->u.l.savedpc = pc) + + +/* +** Whenever code can raise errors, the global 'pc' and the global +** 'top' must be correct to report occasional errors. +*/ +#define savestate(L,ci) (savepc(L), L->top.p = ci->top.p) + + +/* +** Protect code that, in general, can raise errors, reallocate the +** stack, and change the hooks. +*/ +#define Protect(exp) (savestate(L,ci), (exp), updatetrap(ci)) + +/* special version that does not change the top */ +#define ProtectNT(exp) (savepc(L), (exp), updatetrap(ci)) + +/* +** Protect code that can only raise errors. (That is, it cannot change +** the stack or hooks.) +*/ +#define halfProtect(exp) (savestate(L,ci), (exp)) + +/* 'c' is the limit of live values in the stack */ +#define checkGC(L,c) \ + { luaC_condGC(L, (savepc(L), L->top.p = (c)), \ + updatetrap(ci)); \ + luai_threadyield(L); } + + +/* fetch an instruction and prepare its execution */ +#define vmfetch() { \ + if (l_unlikely(trap)) { /* stack reallocation or hooks? */ \ + trap = luaG_traceexec(L, pc); /* handle hooks */ \ + updatebase(ci); /* correct stack */ \ + } \ + i = *(pc++); \ +} + +#define vmdispatch(o) switch(o) +#define vmcase(l) case l: +#define vmbreak break + + +void luaV_execute (lua_State *L, CallInfo *ci) { + LClosure *cl; + TValue *k; + StkId base; + const Instruction *pc; + int trap; +#if LUA_USE_JUMPTABLE +#include "ljumptab.h" +#endif + startfunc: + trap = L->hookmask; + returning: /* trap already set */ + cl = clLvalue(s2v(ci->func.p)); + k = cl->p->k; + pc = ci->u.l.savedpc; + if (l_unlikely(trap)) { + if (pc == cl->p->code) { /* first instruction (not resuming)? */ + if (cl->p->is_vararg) + trap = 0; /* hooks will start after VARARGPREP instruction */ + else /* check 'call' hook */ + luaD_hookcall(L, ci); + } + ci->u.l.trap = 1; /* assume trap is on, for now */ + } + base = ci->func.p + 1; + /* main loop of interpreter */ + for (;;) { + Instruction i; /* instruction being executed */ + vmfetch(); + #if 0 + /* low-level line tracing for debugging Lua */ + printf("line: %d\n", luaG_getfuncline(cl->p, pcRel(pc, cl->p))); + #endif + lua_assert(base == ci->func.p + 1); + lua_assert(base <= L->top.p && L->top.p <= L->stack_last.p); + /* invalidate top for instructions not expecting it */ + lua_assert(isIT(i) || (cast_void(L->top.p = base), 1)); + vmdispatch (GET_OPCODE(i)) { + vmcase(OP_MOVE) { + StkId ra = RA(i); + setobjs2s(L, ra, RB(i)); + vmbreak; + } + vmcase(OP_LOADI) { + StkId ra = RA(i); + lua_Integer b = GETARG_sBx(i); + setivalue(s2v(ra), b); + vmbreak; + } + vmcase(OP_LOADF) { + StkId ra = RA(i); + int b = GETARG_sBx(i); + setfltvalue(s2v(ra), cast_num(b)); + vmbreak; + } + vmcase(OP_LOADK) { + StkId ra = RA(i); + TValue *rb = k + GETARG_Bx(i); + setobj2s(L, ra, rb); + vmbreak; + } + vmcase(OP_LOADKX) { + StkId ra = RA(i); + TValue *rb; + rb = k + GETARG_Ax(*pc); pc++; + setobj2s(L, ra, rb); + vmbreak; + } + vmcase(OP_LOADFALSE) { + StkId ra = RA(i); + setbfvalue(s2v(ra)); + vmbreak; + } + vmcase(OP_LFALSESKIP) { + StkId ra = RA(i); + setbfvalue(s2v(ra)); + pc++; /* skip next instruction */ + vmbreak; + } + vmcase(OP_LOADTRUE) { + StkId ra = RA(i); + setbtvalue(s2v(ra)); + vmbreak; + } + vmcase(OP_LOADNIL) { + StkId ra = RA(i); + int b = GETARG_B(i); + do { + setnilvalue(s2v(ra++)); + } while (b--); + vmbreak; + } + vmcase(OP_GETUPVAL) { + StkId ra = RA(i); + int b = GETARG_B(i); + setobj2s(L, ra, cl->upvals[b]->v.p); + vmbreak; + } + vmcase(OP_SETUPVAL) { + StkId ra = RA(i); + UpVal *uv = cl->upvals[GETARG_B(i)]; + setobj(L, uv->v.p, s2v(ra)); + luaC_barrier(L, uv, s2v(ra)); + vmbreak; + } + vmcase(OP_GETTABUP) { + StkId ra = RA(i); + const TValue *slot; + TValue *upval = cl->upvals[GETARG_B(i)]->v.p; + TValue *rc = KC(i); + TString *key = tsvalue(rc); /* key must be a string */ + if (luaV_fastget(L, upval, key, slot, luaH_getshortstr)) { + setobj2s(L, ra, slot); + } + else + Protect(luaV_finishget(L, upval, rc, ra, slot)); + vmbreak; + } + vmcase(OP_GETTABLE) { + StkId ra = RA(i); + const TValue *slot; + TValue *rb = vRB(i); + TValue *rc = vRC(i); + lua_Unsigned n; + if (ttisinteger(rc) /* fast track for integers? */ + ? (cast_void(n = ivalue(rc)), luaV_fastgeti(L, rb, n, slot)) + : luaV_fastget(L, rb, rc, slot, luaH_get)) { + setobj2s(L, ra, slot); + } + else + Protect(luaV_finishget(L, rb, rc, ra, slot)); + vmbreak; + } + vmcase(OP_GETI) { + StkId ra = RA(i); + const TValue *slot; + TValue *rb = vRB(i); + int c = GETARG_C(i); + if (luaV_fastgeti(L, rb, c, slot)) { + setobj2s(L, ra, slot); + } + else { + TValue key; + setivalue(&key, c); + Protect(luaV_finishget(L, rb, &key, ra, slot)); + } + vmbreak; + } + vmcase(OP_GETFIELD) { + StkId ra = RA(i); + const TValue *slot; + TValue *rb = vRB(i); + TValue *rc = KC(i); + TString *key = tsvalue(rc); /* key must be a string */ + if (luaV_fastget(L, rb, key, slot, luaH_getshortstr)) { + setobj2s(L, ra, slot); + } + else + Protect(luaV_finishget(L, rb, rc, ra, slot)); + vmbreak; + } + vmcase(OP_SETTABUP) { + const TValue *slot; + TValue *upval = cl->upvals[GETARG_A(i)]->v.p; + TValue *rb = KB(i); + TValue *rc = RKC(i); + TString *key = tsvalue(rb); /* key must be a string */ + if (luaV_fastget(L, upval, key, slot, luaH_getshortstr)) { + luaV_finishfastset(L, upval, slot, rc); + } + else + Protect(luaV_finishset(L, upval, rb, rc, slot)); + vmbreak; + } + vmcase(OP_SETTABLE) { + StkId ra = RA(i); + const TValue *slot; + TValue *rb = vRB(i); /* key (table is in 'ra') */ + TValue *rc = RKC(i); /* value */ + lua_Unsigned n; + if (ttisinteger(rb) /* fast track for integers? */ + ? (cast_void(n = ivalue(rb)), luaV_fastgeti(L, s2v(ra), n, slot)) + : luaV_fastget(L, s2v(ra), rb, slot, luaH_get)) { + luaV_finishfastset(L, s2v(ra), slot, rc); + } + else + Protect(luaV_finishset(L, s2v(ra), rb, rc, slot)); + vmbreak; + } + vmcase(OP_SETI) { + StkId ra = RA(i); + const TValue *slot; + int c = GETARG_B(i); + TValue *rc = RKC(i); + if (luaV_fastgeti(L, s2v(ra), c, slot)) { + luaV_finishfastset(L, s2v(ra), slot, rc); + } + else { + TValue key; + setivalue(&key, c); + Protect(luaV_finishset(L, s2v(ra), &key, rc, slot)); + } + vmbreak; + } + vmcase(OP_SETFIELD) { + StkId ra = RA(i); + const TValue *slot; + TValue *rb = KB(i); + TValue *rc = RKC(i); + TString *key = tsvalue(rb); /* key must be a string */ + if (luaV_fastget(L, s2v(ra), key, slot, luaH_getshortstr)) { + luaV_finishfastset(L, s2v(ra), slot, rc); + } + else + Protect(luaV_finishset(L, s2v(ra), rb, rc, slot)); + vmbreak; + } + vmcase(OP_NEWTABLE) { + StkId ra = RA(i); + int b = GETARG_B(i); /* log2(hash size) + 1 */ + int c = GETARG_C(i); /* array size */ + Table *t; + if (b > 0) + b = 1 << (b - 1); /* size is 2^(b - 1) */ + lua_assert((!TESTARG_k(i)) == (GETARG_Ax(*pc) == 0)); + if (TESTARG_k(i)) /* non-zero extra argument? */ + c += GETARG_Ax(*pc) * (MAXARG_C + 1); /* add it to size */ + pc++; /* skip extra argument */ + L->top.p = ra + 1; /* correct top in case of emergency GC */ + t = luaH_new(L); /* memory allocation */ + sethvalue2s(L, ra, t); + if (b != 0 || c != 0) + luaH_resize(L, t, c, b); /* idem */ + checkGC(L, ra + 1); + vmbreak; + } + vmcase(OP_SELF) { + StkId ra = RA(i); + const TValue *slot; + TValue *rb = vRB(i); + TValue *rc = RKC(i); + TString *key = tsvalue(rc); /* key must be a string */ + setobj2s(L, ra + 1, rb); + if (luaV_fastget(L, rb, key, slot, luaH_getstr)) { + setobj2s(L, ra, slot); + } + else + Protect(luaV_finishget(L, rb, rc, ra, slot)); + vmbreak; + } + vmcase(OP_ADDI) { + op_arithI(L, l_addi, luai_numadd); + vmbreak; + } + vmcase(OP_ADDK) { + op_arithK(L, l_addi, luai_numadd); + vmbreak; + } + vmcase(OP_SUBK) { + op_arithK(L, l_subi, luai_numsub); + vmbreak; + } + vmcase(OP_MULK) { + op_arithK(L, l_muli, luai_nummul); + vmbreak; + } + vmcase(OP_MODK) { + savestate(L, ci); /* in case of division by 0 */ + op_arithK(L, luaV_mod, luaV_modf); + vmbreak; + } + vmcase(OP_POWK) { + op_arithfK(L, luai_numpow); + vmbreak; + } + vmcase(OP_DIVK) { + op_arithfK(L, luai_numdiv); + vmbreak; + } + vmcase(OP_IDIVK) { + savestate(L, ci); /* in case of division by 0 */ + op_arithK(L, luaV_idiv, luai_numidiv); + vmbreak; + } + vmcase(OP_BANDK) { + op_bitwiseK(L, l_band); + vmbreak; + } + vmcase(OP_BORK) { + op_bitwiseK(L, l_bor); + vmbreak; + } + vmcase(OP_BXORK) { + op_bitwiseK(L, l_bxor); + vmbreak; + } + vmcase(OP_SHRI) { + StkId ra = RA(i); + TValue *rb = vRB(i); + int ic = GETARG_sC(i); + lua_Integer ib; + if (tointegerns(rb, &ib)) { + pc++; setivalue(s2v(ra), luaV_shiftl(ib, -ic)); + } + vmbreak; + } + vmcase(OP_SHLI) { + StkId ra = RA(i); + TValue *rb = vRB(i); + int ic = GETARG_sC(i); + lua_Integer ib; + if (tointegerns(rb, &ib)) { + pc++; setivalue(s2v(ra), luaV_shiftl(ic, ib)); + } + vmbreak; + } + vmcase(OP_ADD) { + op_arith(L, l_addi, luai_numadd); + vmbreak; + } + vmcase(OP_SUB) { + op_arith(L, l_subi, luai_numsub); + vmbreak; + } + vmcase(OP_MUL) { + op_arith(L, l_muli, luai_nummul); + vmbreak; + } + vmcase(OP_MOD) { + savestate(L, ci); /* in case of division by 0 */ + op_arith(L, luaV_mod, luaV_modf); + vmbreak; + } + vmcase(OP_POW) { + op_arithf(L, luai_numpow); + vmbreak; + } + vmcase(OP_DIV) { /* float division (always with floats) */ + op_arithf(L, luai_numdiv); + vmbreak; + } + vmcase(OP_IDIV) { /* floor division */ + savestate(L, ci); /* in case of division by 0 */ + op_arith(L, luaV_idiv, luai_numidiv); + vmbreak; + } + vmcase(OP_BAND) { + op_bitwise(L, l_band); + vmbreak; + } + vmcase(OP_BOR) { + op_bitwise(L, l_bor); + vmbreak; + } + vmcase(OP_BXOR) { + op_bitwise(L, l_bxor); + vmbreak; + } + vmcase(OP_SHR) { + op_bitwise(L, luaV_shiftr); + vmbreak; + } + vmcase(OP_SHL) { + op_bitwise(L, luaV_shiftl); + vmbreak; + } + vmcase(OP_MMBIN) { + StkId ra = RA(i); + Instruction pi = *(pc - 2); /* original arith. expression */ + TValue *rb = vRB(i); + TMS tm = (TMS)GETARG_C(i); + StkId result = RA(pi); + lua_assert(OP_ADD <= GET_OPCODE(pi) && GET_OPCODE(pi) <= OP_SHR); + Protect(luaT_trybinTM(L, s2v(ra), rb, result, tm)); + vmbreak; + } + vmcase(OP_MMBINI) { + StkId ra = RA(i); + Instruction pi = *(pc - 2); /* original arith. expression */ + int imm = GETARG_sB(i); + TMS tm = (TMS)GETARG_C(i); + int flip = GETARG_k(i); + StkId result = RA(pi); + Protect(luaT_trybiniTM(L, s2v(ra), imm, flip, result, tm)); + vmbreak; + } + vmcase(OP_MMBINK) { + StkId ra = RA(i); + Instruction pi = *(pc - 2); /* original arith. expression */ + TValue *imm = KB(i); + TMS tm = (TMS)GETARG_C(i); + int flip = GETARG_k(i); + StkId result = RA(pi); + Protect(luaT_trybinassocTM(L, s2v(ra), imm, flip, result, tm)); + vmbreak; + } + vmcase(OP_UNM) { + StkId ra = RA(i); + TValue *rb = vRB(i); + lua_Number nb; + if (ttisinteger(rb)) { + lua_Integer ib = ivalue(rb); + setivalue(s2v(ra), intop(-, 0, ib)); + } + else if (tonumberns(rb, nb)) { + setfltvalue(s2v(ra), luai_numunm(L, nb)); + } + else + Protect(luaT_trybinTM(L, rb, rb, ra, TM_UNM)); + vmbreak; + } + vmcase(OP_BNOT) { + StkId ra = RA(i); + TValue *rb = vRB(i); + lua_Integer ib; + if (tointegerns(rb, &ib)) { + setivalue(s2v(ra), intop(^, ~l_castS2U(0), ib)); + } + else + Protect(luaT_trybinTM(L, rb, rb, ra, TM_BNOT)); + vmbreak; + } + vmcase(OP_NOT) { + StkId ra = RA(i); + TValue *rb = vRB(i); + if (l_isfalse(rb)) + setbtvalue(s2v(ra)); + else + setbfvalue(s2v(ra)); + vmbreak; + } + vmcase(OP_LEN) { + StkId ra = RA(i); + Protect(luaV_objlen(L, ra, vRB(i))); + vmbreak; + } + vmcase(OP_CONCAT) { + StkId ra = RA(i); + int n = GETARG_B(i); /* number of elements to concatenate */ + L->top.p = ra + n; /* mark the end of concat operands */ + ProtectNT(luaV_concat(L, n)); + checkGC(L, L->top.p); /* 'luaV_concat' ensures correct top */ + vmbreak; + } + vmcase(OP_CLOSE) { + StkId ra = RA(i); + Protect(luaF_close(L, ra, LUA_OK, 1)); + vmbreak; + } + vmcase(OP_TBC) { + StkId ra = RA(i); + /* create new to-be-closed upvalue */ + halfProtect(luaF_newtbcupval(L, ra)); + vmbreak; + } + vmcase(OP_JMP) { + dojump(ci, i, 0); + vmbreak; + } + vmcase(OP_EQ) { + StkId ra = RA(i); + int cond; + TValue *rb = vRB(i); + Protect(cond = luaV_equalobj(L, s2v(ra), rb)); + docondjump(); + vmbreak; + } + vmcase(OP_LT) { + op_order(L, l_lti, LTnum, lessthanothers); + vmbreak; + } + vmcase(OP_LE) { + op_order(L, l_lei, LEnum, lessequalothers); + vmbreak; + } + vmcase(OP_EQK) { + StkId ra = RA(i); + TValue *rb = KB(i); + /* basic types do not use '__eq'; we can use raw equality */ + int cond = luaV_rawequalobj(s2v(ra), rb); + docondjump(); + vmbreak; + } + vmcase(OP_EQI) { + StkId ra = RA(i); + int cond; + int im = GETARG_sB(i); + if (ttisinteger(s2v(ra))) + cond = (ivalue(s2v(ra)) == im); + else if (ttisfloat(s2v(ra))) + cond = luai_numeq(fltvalue(s2v(ra)), cast_num(im)); + else + cond = 0; /* other types cannot be equal to a number */ + docondjump(); + vmbreak; + } + vmcase(OP_LTI) { + op_orderI(L, l_lti, luai_numlt, 0, TM_LT); + vmbreak; + } + vmcase(OP_LEI) { + op_orderI(L, l_lei, luai_numle, 0, TM_LE); + vmbreak; + } + vmcase(OP_GTI) { + op_orderI(L, l_gti, luai_numgt, 1, TM_LT); + vmbreak; + } + vmcase(OP_GEI) { + op_orderI(L, l_gei, luai_numge, 1, TM_LE); + vmbreak; + } + vmcase(OP_TEST) { + StkId ra = RA(i); + int cond = !l_isfalse(s2v(ra)); + docondjump(); + vmbreak; + } + vmcase(OP_TESTSET) { + StkId ra = RA(i); + TValue *rb = vRB(i); + if (l_isfalse(rb) == GETARG_k(i)) + pc++; + else { + setobj2s(L, ra, rb); + donextjump(ci); + } + vmbreak; + } + vmcase(OP_CALL) { + StkId ra = RA(i); + CallInfo *newci; + int b = GETARG_B(i); + int nresults = GETARG_C(i) - 1; + if (b != 0) /* fixed number of arguments? */ + L->top.p = ra + b; /* top signals number of arguments */ + /* else previous instruction set top */ + savepc(L); /* in case of errors */ + if ((newci = luaD_precall(L, ra, nresults)) == NULL) + updatetrap(ci); /* C call; nothing else to be done */ + else { /* Lua call: run function in this same C frame */ + ci = newci; + goto startfunc; + } + vmbreak; + } + vmcase(OP_TAILCALL) { + StkId ra = RA(i); + int b = GETARG_B(i); /* number of arguments + 1 (function) */ + int n; /* number of results when calling a C function */ + int nparams1 = GETARG_C(i); + /* delta is virtual 'func' - real 'func' (vararg functions) */ + int delta = (nparams1) ? ci->u.l.nextraargs + nparams1 : 0; + if (b != 0) + L->top.p = ra + b; + else /* previous instruction set top */ + b = cast_int(L->top.p - ra); + savepc(ci); /* several calls here can raise errors */ + if (TESTARG_k(i)) { + luaF_closeupval(L, base); /* close upvalues from current call */ + lua_assert(L->tbclist.p < base); /* no pending tbc variables */ + lua_assert(base == ci->func.p + 1); + } + if ((n = luaD_pretailcall(L, ci, ra, b, delta)) < 0) /* Lua function? */ + goto startfunc; /* execute the callee */ + else { /* C function? */ + ci->func.p -= delta; /* restore 'func' (if vararg) */ + luaD_poscall(L, ci, n); /* finish caller */ + updatetrap(ci); /* 'luaD_poscall' can change hooks */ + goto ret; /* caller returns after the tail call */ + } + } + vmcase(OP_RETURN) { + StkId ra = RA(i); + int n = GETARG_B(i) - 1; /* number of results */ + int nparams1 = GETARG_C(i); + if (n < 0) /* not fixed? */ + n = cast_int(L->top.p - ra); /* get what is available */ + savepc(ci); + if (TESTARG_k(i)) { /* may there be open upvalues? */ + ci->u2.nres = n; /* save number of returns */ + if (L->top.p < ci->top.p) + L->top.p = ci->top.p; + luaF_close(L, base, CLOSEKTOP, 1); + updatetrap(ci); + updatestack(ci); + } + if (nparams1) /* vararg function? */ + ci->func.p -= ci->u.l.nextraargs + nparams1; + L->top.p = ra + n; /* set call for 'luaD_poscall' */ + luaD_poscall(L, ci, n); + updatetrap(ci); /* 'luaD_poscall' can change hooks */ + goto ret; + } + vmcase(OP_RETURN0) { + if (l_unlikely(L->hookmask)) { + StkId ra = RA(i); + L->top.p = ra; + savepc(ci); + luaD_poscall(L, ci, 0); /* no hurry... */ + trap = 1; + } + else { /* do the 'poscall' here */ + int nres; + L->ci = ci->previous; /* back to caller */ + L->top.p = base - 1; + for (nres = ci->nresults; l_unlikely(nres > 0); nres--) + setnilvalue(s2v(L->top.p++)); /* all results are nil */ + } + goto ret; + } + vmcase(OP_RETURN1) { + if (l_unlikely(L->hookmask)) { + StkId ra = RA(i); + L->top.p = ra + 1; + savepc(ci); + luaD_poscall(L, ci, 1); /* no hurry... */ + trap = 1; + } + else { /* do the 'poscall' here */ + int nres = ci->nresults; + L->ci = ci->previous; /* back to caller */ + if (nres == 0) + L->top.p = base - 1; /* asked for no results */ + else { + StkId ra = RA(i); + setobjs2s(L, base - 1, ra); /* at least this result */ + L->top.p = base; + for (; l_unlikely(nres > 1); nres--) + setnilvalue(s2v(L->top.p++)); /* complete missing results */ + } + } + ret: /* return from a Lua function */ + if (ci->callstatus & CIST_FRESH) + return; /* end this frame */ + else { + ci = ci->previous; + goto returning; /* continue running caller in this frame */ + } + } + vmcase(OP_FORLOOP) { + StkId ra = RA(i); + if (ttisinteger(s2v(ra + 2))) { /* integer loop? */ + lua_Unsigned count = l_castS2U(ivalue(s2v(ra + 1))); + if (count > 0) { /* still more iterations? */ + lua_Integer step = ivalue(s2v(ra + 2)); + lua_Integer idx = ivalue(s2v(ra)); /* internal index */ + chgivalue(s2v(ra + 1), count - 1); /* update counter */ + idx = intop(+, idx, step); /* add step to index */ + chgivalue(s2v(ra), idx); /* update internal index */ + setivalue(s2v(ra + 3), idx); /* and control variable */ + pc -= GETARG_Bx(i); /* jump back */ + } + } + else if (floatforloop(ra)) /* float loop */ + pc -= GETARG_Bx(i); /* jump back */ + updatetrap(ci); /* allows a signal to break the loop */ + vmbreak; + } + vmcase(OP_FORPREP) { + StkId ra = RA(i); + savestate(L, ci); /* in case of errors */ + if (forprep(L, ra)) + pc += GETARG_Bx(i) + 1; /* skip the loop */ + vmbreak; + } + vmcase(OP_TFORPREP) { + StkId ra = RA(i); + /* create to-be-closed upvalue (if needed) */ + halfProtect(luaF_newtbcupval(L, ra + 3)); + pc += GETARG_Bx(i); + i = *(pc++); /* go to next instruction */ + lua_assert(GET_OPCODE(i) == OP_TFORCALL && ra == RA(i)); + goto l_tforcall; + } + vmcase(OP_TFORCALL) { + l_tforcall: { + StkId ra = RA(i); + /* 'ra' has the iterator function, 'ra + 1' has the state, + 'ra + 2' has the control variable, and 'ra + 3' has the + to-be-closed variable. The call will use the stack after + these values (starting at 'ra + 4') + */ + /* push function, state, and control variable */ + memcpy(ra + 4, ra, 3 * sizeof(*ra)); + L->top.p = ra + 4 + 3; + ProtectNT(luaD_call(L, ra + 4, GETARG_C(i))); /* do the call */ + updatestack(ci); /* stack may have changed */ + i = *(pc++); /* go to next instruction */ + lua_assert(GET_OPCODE(i) == OP_TFORLOOP && ra == RA(i)); + goto l_tforloop; + }} + vmcase(OP_TFORLOOP) { + l_tforloop: { + StkId ra = RA(i); + if (!ttisnil(s2v(ra + 4))) { /* continue loop? */ + setobjs2s(L, ra + 2, ra + 4); /* save control variable */ + pc -= GETARG_Bx(i); /* jump back */ + } + vmbreak; + }} + vmcase(OP_SETLIST) { + StkId ra = RA(i); + int n = GETARG_B(i); + unsigned int last = GETARG_C(i); + Table *h = hvalue(s2v(ra)); + if (n == 0) + n = cast_int(L->top.p - ra) - 1; /* get up to the top */ + else + L->top.p = ci->top.p; /* correct top in case of emergency GC */ + last += n; + if (TESTARG_k(i)) { + last += GETARG_Ax(*pc) * (MAXARG_C + 1); + pc++; + } + if (last > luaH_realasize(h)) /* needs more space? */ + luaH_resizearray(L, h, last); /* preallocate it at once */ + for (; n > 0; n--) { + TValue *val = s2v(ra + n); + setobj2t(L, &h->array[last - 1], val); + last--; + luaC_barrierback(L, obj2gco(h), val); + } + vmbreak; + } + vmcase(OP_CLOSURE) { + StkId ra = RA(i); + Proto *p = cl->p->p[GETARG_Bx(i)]; + halfProtect(pushclosure(L, p, cl->upvals, base, ra)); + checkGC(L, ra + 1); + vmbreak; + } + vmcase(OP_VARARG) { + StkId ra = RA(i); + int n = GETARG_C(i) - 1; /* required results */ + Protect(luaT_getvarargs(L, ci, ra, n)); + vmbreak; + } + vmcase(OP_VARARGPREP) { + ProtectNT(luaT_adjustvarargs(L, GETARG_A(i), ci, cl->p)); + if (l_unlikely(trap)) { /* previous "Protect" updated trap */ + luaD_hookcall(L, ci); + L->oldpc = 1; /* next opcode will be seen as a "new" line */ + } + updatebase(ci); /* function has new base after adjustment */ + vmbreak; + } + vmcase(OP_EXTRAARG) { + lua_assert(0); + vmbreak; + } + } + } +} + +/* }================================================================== */ diff --git a/06/lua-5.4.6/src/lvm.h b/06/lua-5.4.6/src/lvm.h new file mode 100644 index 0000000..dba1ad2 --- /dev/null +++ b/06/lua-5.4.6/src/lvm.h @@ -0,0 +1,141 @@ +/* +** $Id: lvm.h $ +** Lua virtual machine +** See Copyright Notice in lua.h +*/ + +#ifndef lvm_h +#define lvm_h + + +#include "ldo.h" +#include "lobject.h" +#include "ltm.h" + + +#if !defined(LUA_NOCVTN2S) +#define cvt2str(o) ttisnumber(o) +#else +#define cvt2str(o) 0 /* no conversion from numbers to strings */ +#endif + + +#if !defined(LUA_NOCVTS2N) +#define cvt2num(o) ttisstring(o) +#else +#define cvt2num(o) 0 /* no conversion from strings to numbers */ +#endif + + +/* +** You can define LUA_FLOORN2I if you want to convert floats to integers +** by flooring them (instead of raising an error if they are not +** integral values) +*/ +#if !defined(LUA_FLOORN2I) +#define LUA_FLOORN2I F2Ieq +#endif + + +/* +** Rounding modes for float->integer coercion + */ +typedef enum { + F2Ieq, /* no rounding; accepts only integral values */ + F2Ifloor, /* takes the floor of the number */ + F2Iceil /* takes the ceil of the number */ +} F2Imod; + + +/* convert an object to a float (including string coercion) */ +#define tonumber(o,n) \ + (ttisfloat(o) ? (*(n) = fltvalue(o), 1) : luaV_tonumber_(o,n)) + + +/* convert an object to a float (without string coercion) */ +#define tonumberns(o,n) \ + (ttisfloat(o) ? ((n) = fltvalue(o), 1) : \ + (ttisinteger(o) ? ((n) = cast_num(ivalue(o)), 1) : 0)) + + +/* convert an object to an integer (including string coercion) */ +#define tointeger(o,i) \ + (l_likely(ttisinteger(o)) ? (*(i) = ivalue(o), 1) \ + : luaV_tointeger(o,i,LUA_FLOORN2I)) + + +/* convert an object to an integer (without string coercion) */ +#define tointegerns(o,i) \ + (l_likely(ttisinteger(o)) ? (*(i) = ivalue(o), 1) \ + : luaV_tointegerns(o,i,LUA_FLOORN2I)) + + +#define intop(op,v1,v2) l_castU2S(l_castS2U(v1) op l_castS2U(v2)) + +#define luaV_rawequalobj(t1,t2) luaV_equalobj(NULL,t1,t2) + + +/* +** fast track for 'gettable': if 't' is a table and 't[k]' is present, +** return 1 with 'slot' pointing to 't[k]' (position of final result). +** Otherwise, return 0 (meaning it will have to check metamethod) +** with 'slot' pointing to an empty 't[k]' (if 't' is a table) or NULL +** (otherwise). 'f' is the raw get function to use. +*/ +#define luaV_fastget(L,t,k,slot,f) \ + (!ttistable(t) \ + ? (slot = NULL, 0) /* not a table; 'slot' is NULL and result is 0 */ \ + : (slot = f(hvalue(t), k), /* else, do raw access */ \ + !isempty(slot))) /* result not empty? */ + + +/* +** Special case of 'luaV_fastget' for integers, inlining the fast case +** of 'luaH_getint'. +*/ +#define luaV_fastgeti(L,t,k,slot) \ + (!ttistable(t) \ + ? (slot = NULL, 0) /* not a table; 'slot' is NULL and result is 0 */ \ + : (slot = (l_castS2U(k) - 1u < hvalue(t)->alimit) \ + ? &hvalue(t)->array[k - 1] : luaH_getint(hvalue(t), k), \ + !isempty(slot))) /* result not empty? */ + + +/* +** Finish a fast set operation (when fast get succeeds). In that case, +** 'slot' points to the place to put the value. +*/ +#define luaV_finishfastset(L,t,slot,v) \ + { setobj2t(L, cast(TValue *,slot), v); \ + luaC_barrierback(L, gcvalue(t), v); } + + +/* +** Shift right is the same as shift left with a negative 'y' +*/ +#define luaV_shiftr(x,y) luaV_shiftl(x,intop(-, 0, y)) + + + +LUAI_FUNC int luaV_equalobj (lua_State *L, const TValue *t1, const TValue *t2); +LUAI_FUNC int luaV_lessthan (lua_State *L, const TValue *l, const TValue *r); +LUAI_FUNC int luaV_lessequal (lua_State *L, const TValue *l, const TValue *r); +LUAI_FUNC int luaV_tonumber_ (const TValue *obj, lua_Number *n); +LUAI_FUNC int luaV_tointeger (const TValue *obj, lua_Integer *p, F2Imod mode); +LUAI_FUNC int luaV_tointegerns (const TValue *obj, lua_Integer *p, + F2Imod mode); +LUAI_FUNC int luaV_flttointeger (lua_Number n, lua_Integer *p, F2Imod mode); +LUAI_FUNC void luaV_finishget (lua_State *L, const TValue *t, TValue *key, + StkId val, const TValue *slot); +LUAI_FUNC void luaV_finishset (lua_State *L, const TValue *t, TValue *key, + TValue *val, const TValue *slot); +LUAI_FUNC void luaV_finishOp (lua_State *L); +LUAI_FUNC void luaV_execute (lua_State *L, CallInfo *ci); +LUAI_FUNC void luaV_concat (lua_State *L, int total); +LUAI_FUNC lua_Integer luaV_idiv (lua_State *L, lua_Integer x, lua_Integer y); +LUAI_FUNC lua_Integer luaV_mod (lua_State *L, lua_Integer x, lua_Integer y); +LUAI_FUNC lua_Number luaV_modf (lua_State *L, lua_Number x, lua_Number y); +LUAI_FUNC lua_Integer luaV_shiftl (lua_Integer x, lua_Integer y); +LUAI_FUNC void luaV_objlen (lua_State *L, StkId ra, const TValue *rb); + +#endif diff --git a/06/lua-5.4.6/src/lzio.c b/06/lua-5.4.6/src/lzio.c new file mode 100644 index 0000000..cd0a02d --- /dev/null +++ b/06/lua-5.4.6/src/lzio.c @@ -0,0 +1,68 @@ +/* +** $Id: lzio.c $ +** Buffered streams +** See Copyright Notice in lua.h +*/ + +#define lzio_c +#define LUA_CORE + +#include "lprefix.h" + + +#include + +#include "lua.h" + +#include "llimits.h" +#include "lmem.h" +#include "lstate.h" +#include "lzio.h" + + +int luaZ_fill (ZIO *z) { + size_t size; + lua_State *L = z->L; + const char *buff; + lua_unlock(L); + buff = z->reader(L, z->data, &size); + lua_lock(L); + if (buff == NULL || size == 0) + return EOZ; + z->n = size - 1; /* discount char being returned */ + z->p = buff; + return cast_uchar(*(z->p++)); +} + + +void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader, void *data) { + z->L = L; + z->reader = reader; + z->data = data; + z->n = 0; + z->p = NULL; +} + + +/* --------------------------------------------------------------- read --- */ +size_t luaZ_read (ZIO *z, void *b, size_t n) { + while (n) { + size_t m; + if (z->n == 0) { /* no bytes in buffer? */ + if (luaZ_fill(z) == EOZ) /* try to read more */ + return n; /* no more input; return number of missing bytes */ + else { + z->n++; /* luaZ_fill consumed first byte; put it back */ + z->p--; + } + } + m = (n <= z->n) ? n : z->n; /* min. between n and z->n */ + memcpy(b, z->p, m); + z->n -= m; + z->p += m; + b = (char *)b + m; + n -= m; + } + return 0; +} + diff --git a/06/lua-5.4.6/src/lzio.h b/06/lua-5.4.6/src/lzio.h new file mode 100644 index 0000000..38f397f --- /dev/null +++ b/06/lua-5.4.6/src/lzio.h @@ -0,0 +1,66 @@ +/* +** $Id: lzio.h $ +** Buffered streams +** See Copyright Notice in lua.h +*/ + + +#ifndef lzio_h +#define lzio_h + +#include "lua.h" + +#include "lmem.h" + + +#define EOZ (-1) /* end of stream */ + +typedef struct Zio ZIO; + +#define zgetc(z) (((z)->n--)>0 ? cast_uchar(*(z)->p++) : luaZ_fill(z)) + + +typedef struct Mbuffer { + char *buffer; + size_t n; + size_t buffsize; +} Mbuffer; + +#define luaZ_initbuffer(L, buff) ((buff)->buffer = NULL, (buff)->buffsize = 0) + +#define luaZ_buffer(buff) ((buff)->buffer) +#define luaZ_sizebuffer(buff) ((buff)->buffsize) +#define luaZ_bufflen(buff) ((buff)->n) + +#define luaZ_buffremove(buff,i) ((buff)->n -= (i)) +#define luaZ_resetbuffer(buff) ((buff)->n = 0) + + +#define luaZ_resizebuffer(L, buff, size) \ + ((buff)->buffer = luaM_reallocvchar(L, (buff)->buffer, \ + (buff)->buffsize, size), \ + (buff)->buffsize = size) + +#define luaZ_freebuffer(L, buff) luaZ_resizebuffer(L, buff, 0) + + +LUAI_FUNC void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader, + void *data); +LUAI_FUNC size_t luaZ_read (ZIO* z, void *b, size_t n); /* read next n bytes */ + + + +/* --------- Private Part ------------------ */ + +struct Zio { + size_t n; /* bytes still unread */ + const char *p; /* current position in buffer */ + lua_Reader reader; /* reader function */ + void *data; /* additional data */ + lua_State *L; /* Lua state (for reader) */ +}; + + +LUAI_FUNC int luaZ_fill (ZIO *z); + +#endif diff --git a/06/main.lua b/06/main.lua new file mode 100644 index 0000000..62d74c5 --- /dev/null +++ b/06/main.lua @@ -0,0 +1,44 @@ +local pg = require("parser-gen.parser-gen") +local peg = require "parser-gen.peg-parser" +local errs = {errMissingThen = "Missing Then"} -- one custom error +pg.setlabels(errs) + + +local f = assert(io.open("zig.peg", "r")) +local zig_grammar = f:read("*all") +f:close() +pg.compile(zig_grammar) + + +-- local function dump(value, call_indent) +-- if not call_indent then +-- call_indent = "" +-- end + +-- local indent = call_indent .. " " + +-- local output = "" + +-- if type(value) == "table" then +-- output = output .. "{" +-- local first = true +-- for inner_key, inner_value in pairs ( value ) do +-- if not first then +-- output = output .. ", " +-- else +-- first = false +-- end +-- output = output .. "\n" .. indent +-- output = output .. inner_key .. " = " .. dump ( inner_value, indent ) +-- end +-- output = output .. "\n" .. call_indent .. "}" + +-- elseif type (value) == "userdata" then +-- output = "userdata" +-- else +-- output = value +-- end +-- return output +-- end + +-- print(dump(res, "")) \ No newline at end of file diff --git a/06/parser-gen/LICENSE b/06/parser-gen/LICENSE new file mode 100644 index 0000000..e812781 --- /dev/null +++ b/06/parser-gen/LICENSE @@ -0,0 +1,20 @@ +The MIT License (MIT) + +Copyright (c) 2017 Benas Vaitkevicius + +Permission is hereby granted, free of charge, to any person obtaining a copy of +this software and associated documentation files (the "Software"), to deal in +the Software without restriction, including without limitation the rights to +use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of +the Software, and to permit persons to whom the Software is furnished to do so, +subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS +FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR +COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER +IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN +CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. \ No newline at end of file diff --git a/06/parser-gen/README.md b/06/parser-gen/README.md new file mode 100644 index 0000000..092c79c --- /dev/null +++ b/06/parser-gen/README.md @@ -0,0 +1,397 @@ +# parser-gen + +A Lua parser generator that makes it possible to describe grammars in a [PEG](https://en.wikipedia.org/wiki/Parsing_expression_grammar) syntax. The tool will parse a given input using a provided grammar and if the matching is successful produce an AST as an output with the captured values using [Lpeg](http://www.inf.puc-rio.br/~roberto/lpeg/). If the matching fails, labelled errors can be used in the grammar to indicate failure position, and recovery grammars are generated to continue parsing the input using [LpegLabel](https://github.com/sqmedeiros/lpeglabel). The tool can also automatically generate error labels and recovery grammars for LL(1) grammars. + +parser-gen is a [GSoC 2017](https://developers.google.com/open-source/gsoc/) project, and was completed with the help of my mentor [@sqmedeiros](https://github.com/sqmedeiros) from [LabLua](http://www.lua.inf.puc-rio.br/). A blog documenting the progress of the project can be found [here](https://parsergen.blogspot.com/2017/08/parser-generator-based-on-lpeglabel.html). + +--- +# Table of contents + +* [Requirements](#requirements) + +* [Syntax](#syntax) + +* [Grammar Syntax](#grammar-syntax) + +* [Example: Tiny Parser](#example-tiny-parser) + +# Requirements +``` +lua >= 5.1 +lpeglabel >= 1.2.0 +``` +# Syntax + +### compile + +This function generates a PEG parser from the grammar description. + +```lua +local pg = require "parser-gen" +grammar = pg.compile(input,definitions [, errorgen, noast]) +``` +*Arguments*: + +`input` - A string containing a PEG grammar description. For complete PEG syntax see the grammar section of this document. + +`definitions` - table of custom functions and definitions used inside the grammar, for example {equals=equals}, where equals is a function. + +`errorgen` - **EXPERIMENTAL** optional boolean parameter(default:false), when enabled generates error labels automatically. Works well only on LL(1) grammars. Custom error labels have precedence over automatically generated ones. + +`noast` - optional boolean parameter(default:false), when enabled does not generate an AST for the parse. + +*Output*: + +`grammar` - a compiled grammar on success, throws error on failure. + +### setlabels + +If custom error labels are used, the function *setlabels* allows setting their description (and custom recovery pattern): +```lua +pg.setlabels(t) +``` +Example table of a simple error and one with a custom recovery expression: +```lua +-- grammar rule: " ifexp <- 'if' exp 'then'^missingThen stmt 'end'^missingEnd " +local t = { + missingEnd = "Missing 'end' in if expression", + missingThen = {"Missing 'then' in if expression", " (!stmt .)* "} -- a custom recovery pattern +} +pg.setlabels(t) +``` +If the recovery pattern is not set, then the one specified by the rule SYNC will be used. It is by default set to: +```lua +SKIP <- %s / %nl -- a space ' ' or newline '\n' character +SYNC <- .? (!SKIP .)* +``` +Learn more about special rules in the grammar section. + +### parse + +This operation attempts to match a grammar to the given input. + +```lua +result, errors = pg.parse(input, grammar [, errorfunction]) +``` +*Arguments*: + +`input` - an input string that the tool will attempt to parse. + +`grammar` - a compiled grammar. + +`errorfunction` - an optional function that will be called if an error is encountered, with the arguments `desc` for the error description set using `setlabels()`; location indicators `line` and `col`; the remaining string before failure `sfail` and a custom recovery expression `trec` if available. +Example: +```lua +local errs = 0 +local function printerror(desc,line,col,sfail,trec) + errs = errs+1 + print("Error #"..errs..": "..desc.." before '"..sfail.."' on line "..line.."(col "..col..")") +end + +result, errors = pg.parse(input,grammar,printerror) +``` +*Output*: + +If the parse is succesful, the function returns an abstract syntax tree containing the captures `result` and a table of any encountered `errors`. If the parse was unsuccessful, `result` is going to be **nil**. +Also, if the `noast` option is enabled when compiling the grammar, the function will then produce the longest match length or any custom captures used. + +### calcline + +Calculates line and column information regarding position i of the subject (exported from the relabel module). + +```lua +line, col = pg.calcline(subject, position) +``` +*Arguments*: + +`subject` - subject string + +`position` - position inside the string, for example, the one given by automatic AST generation. + +### usenodes + +When AST generation is enabled, this function will enable the "node" mode, where only rules tagged with a `node` prefix will generate AST entries. Must be used before compiling the grammar. + +```lua +pg.usenodes(value) +``` +*Arguments*: + +`value` - a boolean value that enables or disables this function + +# Grammar Syntax + +The grammar used for this tool is described using a PEG-like syntax, that is identical to the one provided by the [re](http://www.inf.puc-rio.br/~roberto/lpeg/re.html) module, with an extension of labelled failures provided by [relabel](https://github.com/sqmedeiros/lpeglabel) module (except numbered labels). That is, all grammars that work with relabel should work with parser-gen as long as numbered error labels are not used, as they are not supported by parser-gen. + +Since a parser generated with parser-gen automatically consumes space characters, builds ASTs and generates errors, additional extensions have been added based on the [ANTLR](http://www.antlr.org/) syntax. + +### Basic syntax + +The syntax of parser-gen grammars is somewhat similar to regex syntax. The next table summarizes the tools syntax. A p represents an arbitrary pattern; num represents a number (`[0-9]+`); name represents an identifier (`[a-zA-Z][a-zA-Z0-9_]*`).`defs` is the definitions table provided when compiling the grammar. Note that error names must be set using `setlabels()` before compiling the grammar. Constructions are listed in order of decreasing precedence. + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
SyntaxDescription
( p ) grouping
'string' literal string
"string" literal string
[class] character class
. any character
%namepattern defs[name] or a pre-defined pattern
namenon terminal
<name>non terminal
%{name} error label
{} position capture
{ p } simple capture
{: p :} anonymous group capture
{:name: p :} named group capture
{~ p ~} substitution capture
{| p |} table capture
=name back reference +
p ? optional match
p * zero or more repetitions
p + one or more repetitions
p^num exactly n repetitions
p^+numat least n repetitions
p^-numat most n repetitions
p^name match p or throw error label name.
p -> 'string' string capture
p -> "string" string capture
p -> num numbered capture
p -> name function/query/string capture +equivalent to p / defs[name]
p => name match-time capture +equivalent to lpeg.Cmt(p, defs[name])
& p and predicate
! p not predicate
p1 p2 concatenation
p1 //{name [, name, ...]} p2 specifies recovery pattern p2 for p1 +when one of the labels is thrown
p1 / p2 ordered choice
(name <- p)+ grammar
+ + +The grammar below is used to match balanced parenthesis + +```lua +balanced <- "(" ([^()] / balanced)* ")" +``` +For more examples check out the [re](http://www.inf.puc-rio.br/~roberto/lpeg/re.html) page, see the Tiny parser below or the [Lua parser](https://github.com/vsbenas/parser-gen/blob/master/parsers/lua-parser.lua) writen with this tool. + +### Error labels + +Error labels are provided by the relabel function %{errorname} (errorname must follow `[A-Za-z][A-Za-z0-9_]*` format). Usually we use error labels in a syntax like `'a' ('b' / %{errB}) 'c'`, which throws an error label if `'b'` is not matched. This syntax is quite complicated so an additional syntax is allowed `'a' 'b'^errB 'c'`, which allows cleaner description of grammars. Note: all errors must be defined in a table using parser-gen.setlabels() before compiling and parsing the grammar. + +### Tokens + +Non-terminals with names in all capital letters, i.e. `[A-Z]+`, are considered tokens and are treated as a single object in parsing. That is, the whole string matched by a token is captured in a single AST entry and space characters are not consumed. Consider two examples: +```lua +-- a token non-terminal +grammar = pg.compile [[ + WORD <- [A-Z]+ +]] +res, _ = pg.parse("AA A", grammar) -- outputs {rule="WORD", "AA"} +``` +```lua +-- a non-token non-terminal +grammar = pg.compile [[ + word <- [A-Z]+ +]] +res, _ = pg.parse("AA A", grammar) -- outputs {rule="word", "A", "A", "A"} +``` + +### Fragments + +If a token definition is followed by a `fragment` keyword, then the parser does not build an AST entry for that token. Essentially, these rules are used to simplify grammars without building unnecessarily complicated ASTS. Example of `fragment` usage: +```lua +grammar = pg.compile [[ + WORD <- LETTER+ + fragment LETTER <- [A-Z] +]] +res, _ = pg.parse("AA A", grammar) -- outputs {rule="WORD", "AA"} +``` +Without using `fragment`: +```lua +grammar = pg.compile [[ + WORD <- LETTER+ + LETTER <- [A-Z] +]] +res, _ = pg.parse("AA A", grammar) -- outputs {rule="WORD", {rule="LETTER", "A"}, {rule="LETTER", "A"}} + +``` + +### Nodes + +When node mode is enabled using `pg.usenodes(true)` only rules prefixed with a `node` keyword will generate AST entries: +```lua +grammar = pg.compile [[ + node WORD <- LETTER+ + LETTER <- [A-Z] +]] +res, _ = pg.parse("AA A", grammar) -- outputs {rule="WORD", "AA"} +``` +### Special rules + +There are two special rules used by the grammar: + +#### SKIP + +The `SKIP` rule identifies which characters to skip in a grammar. For example, most programming languages do not take into acount any space or newline characters. By default, SKIP is set to: +```lua +SKIP <- %s / %nl +``` +This rule can be extended to contain semicolons `';'`, comments, or any other patterns that the parser can safely ignore. + +Character skipping can be disabled by using: +```lua +SKIP <- '' +``` + +#### SYNC + +This rule specifies the general recovery expression both for custom errors and automatically generated ones. By default: +```lua +SYNC <- .? (!SKIP .)* +``` +The default SYNC rule consumes any characters until the next character matched by SKIP, usually a space or a newline. That means, if some statement in a program is invalid, the parser will continue parsing after a space or a newline character. + +For some programming languages it might be useful to skip to a semicolon or a keyword, since they usually indicate the end of a statement, so SYNC could be something like: +```lua +HELPER <- ';' / 'end' / SKIP -- etc +SYNC <- (!HELPER .)* SKIP* -- we can consume the spaces after syncing with them as well +``` + +Recovery grammars can be disabled by using: +```lua +SYNC <- '' +``` +# Example: Tiny parser + +Below is the full code from *parsers/tiny-parser.lua*: +```lua +local pg = require "parser-gen" +local peg = require "peg-parser" +local errs = {errMissingThen = "Missing Then"} -- one custom error +pg.setlabels(errs) + +--warning: experimental error generation function is enabled. If the grammar isn't LL(1), set errorgen to false +local errorgen = true + +local grammar = pg.compile([[ + + program <- stmtsequence !. + stmtsequence <- statement (';' statement)* + statement <- ifstmt / repeatstmt / assignstmt / readstmt / writestmt + ifstmt <- 'if' exp 'then'^errMissingThen stmtsequence elsestmt? 'end' + elsestmt <- ('else' stmtsequence) + repeatstmt <- 'repeat' stmtsequence 'until' exp + assignstmt <- IDENTIFIER ':=' exp + readstmt <- 'read' IDENTIFIER + writestmt <- 'write' exp + exp <- simpleexp (COMPARISONOP simpleexp)* + COMPARISONOP <- '<' / '=' + simpleexp <- term (ADDOP term)* + ADDOP <- [+-] + term <- factor (MULOP factor)* + MULOP <- [*/] + factor <- '(' exp ')' / NUMBER / IDENTIFIER + + NUMBER <- '-'? [0-9]+ + KEYWORDS <- 'if' / 'repeat' / 'read' / 'write' / 'then' / 'else' / 'end' / 'until' + RESERVED <- KEYWORDS ![a-zA-Z] + IDENTIFIER <- !RESERVED [a-zA-Z]+ + HELPER <- ';' / %nl / %s / KEYWORDS / !. + SYNC <- (!HELPER .)* + +]], _, errorgen) + +local errors = 0 +local function printerror(desc,line,col,sfail,trec) + errors = errors+1 + print("Error #"..errors..": "..desc.." on line "..line.."(col "..col..")") +end + + +local function parse(input) + errors = 0 + result, errors = pg.parse(input,grammar,printerror) + return result, errors +end + +if arg[1] then + -- argument must be in quotes if it contains spaces + res, errs = parse(arg[1]) + peg.print_t(res) + peg.print_r(errs) +end +local ret = {parse=parse} +return ret +``` +For input: `lua tiny-parser-nocap.lua "if a b:=1"` we get: +```lua +Error #1: Missing Then on line 1(col 6) +Error #2: Expected stmtsequence on line 1(col 9) +Error #3: Expected 'end' on line 1(col 9) +-- ast: +rule='program', +pos=1, +{ + rule='stmtsequence', + pos=1, + { + rule='statement', + pos=1, + { + rule='ifstmt', + pos=1, + 'if', + { + rule='exp', + pos=4, + { + rule='simpleexp', + pos=4, + { + rule='term', + pos=4, + { + rule='factor', + pos=4, + { + rule='IDENTIFIER', + pos=4, + 'a', + }, + }, + }, + }, + }, + }, + }, +}, +-- error table: +[1] => { + [msg] => 'Missing Then' -- custom error is used over the automatically generated one + [line] => '1' + [col] => '6' + [label] => 'errMissingThen' + } +[2] => { + [msg] => 'Expected stmtsequence' -- automatically generated errors + [line] => '1' + [col] => '9' + [label] => 'errorgen6' + } +[3] => { + [msg] => 'Expected 'end'' + [line] => '1' + [col] => '9' + [label] => 'errorgen4' + } +``` + + diff --git a/06/parser-gen/equals.lua b/06/parser-gen/equals.lua new file mode 100644 index 0000000..59f8eb9 --- /dev/null +++ b/06/parser-gen/equals.lua @@ -0,0 +1,32 @@ +-- this function compares if two tables are equal +local function equals(o1, o2, ignore_mt) + if o1 == o2 then return true end + local o1Type = type(o1) + local o2Type = type(o2) + if o1Type ~= o2Type then return false end + if o1Type ~= 'table' then return false end + + if not ignore_mt then + local mt1 = getmetatable(o1) + if mt1 and mt1.__eq then + --compare using built in method + return o1 == o2 + end + end + + local keySet = {} + + for key1, value1 in pairs(o1) do + local value2 = o2[key1] + if value2 == nil or equals(value1, value2, ignore_mt) == false then + return false + end + keySet[key1] = true + end + + for key2, _ in pairs(o2) do + if not keySet[key2] then return false end + end + return true +end +return {equals=equals} \ No newline at end of file diff --git a/06/parser-gen/errorgen.lua b/06/parser-gen/errorgen.lua new file mode 100644 index 0000000..c502c0d --- /dev/null +++ b/06/parser-gen/errorgen.lua @@ -0,0 +1,401 @@ +-- Error generation code for LL(1) grammars +-- AST funcs: + +local function isfinal(t) + return t["t"] or t["nt"] or t["func"] or t["s"] or t["num"] +end + +local function isaction(t) + return t["action"] +end + + +local function isrule(t) + return t and t["rulename"] +end + +local function isgrammar(t) + if type(t) == "table" and not(t["action"]) then + return isrule(t[1]) + end + return false +end +local function istoken (t) + return t["token"] == "1" +end + +local function finalNode (t) + if t["t"] then + return"t",t["t"] -- terminal + elseif t["nt"] then + return "nt", t["nt"], istoken(t) -- nonterminal + elseif t["func"] then + return "func", t["func"] -- function + elseif t["s"] then + return "s", t["s"] + elseif t["num"] then + return "num", t["num"] + end + return nil +end + +--[[ + +function rightleaf: + +returns the right-most concatenation in the AST. +used for followset keys + +input: ((A B) C) +output: {"nt_C"} + +input: (A / B / C) (D / 'e') +output: {"nt_D","t_e"} + +input: A* +output: {'',"nt_A"} + +input: !A +output: {"not_nt_A"} +]] +local function addnot(t) + local ret = {} + for k,v in pairs(t) do + ret[k] = "not_"..v + end + return ret +end +local function addepsilon(t) + local ret = t + table.insert(ret, '') + return ret +end +local function mergetables(first,second) + local ret = first + for k,v in pairs(second) do + table.insert(ret, v) + end + return ret +end + +local function rightleaf(t) + local action = t.action + local op1 = t.op1 + local op2 = t.op2 + + if isfinal(t) then + + -- todo: replace nt_A with FIRST(A) + local typefn, fn, tok = finalNode(t) + local ret = typefn .. "_" .. fn -- terminals: t_if, nonterminals: nt_if + return {ret} + + end + + + if action == "or" then + + return mergetables(rightleaf(op1), rightleaf(op2)) + + elseif action == "and" then -- consider only RHS + + return rightleaf(op2) + + elseif action == "&" then + + return rightleaf(op1) + + elseif action == "!" then + + return addnot(rightleaf(op1)) + + elseif action == "+" then + + return rightleaf(op1) + + elseif action == "*" or action == "?" then + + return addepsilon(rightleaf(op1)) + + elseif action == "^" then + + op2 = op2["num"] -- second operand is number + if op2 >= 1 then + return rightleaf(op1) + else + return addepsilon(rightleaf(op1)) + end + + elseif action == "^LABEL" or action == "->" or action == "=>" or action == "tcap" or action == "gcap" or action == "subcap" or action == "scap" then + + return rightleaf(op1) + + elseif action == "bref" or action == "poscap" then + + return addepsilon({}) -- only empty string + + elseif action == "anychar" then + + return {"_anychar"} + + elseif action == "label" then + + return addepsilon({}) + + elseif action == "%" then + + return addepsilon({}) + + elseif action == "invert" then + + return addnot(rightleaf(op1)) + + elseif action == "range" then + + return {"_anychar"} + + else + error("Unsupported action '"..action.."'") + end + +end + + +local FOLLOW = {} + +local function follow_aux(t, dontsplit) + + local action = t.action + local op1 = t.op1 + local op2 = t.op2 + + + if isfinal(t) then + + return {t} + + end + + if action == "or" then + + if dontsplit then -- do not split "(B / C)" in "A (B / C)" + return {t} + else -- return both + return mergetables(follow_aux(op1), follow_aux(op2)) + end + + elseif action == "and" then -- magic happens here + + -- (A (B / D)) (!E C / D) + + -- 1) FOLLOW(B) = FOLLOW(D) = {(!E C / D)} + local rightset = rightleaf(op1) + local rhs = follow_aux(op2) + for k,v in pairs(rightset) do + if not FOLLOW[v] then + FOLLOW[v] = {} + end + -- TODO: check if rhs already exists in FOLLOW(v) + table.insert(FOLLOW[v],rhs) + + end + + -- 2) FOLLOW(A) = {(B / D)} + + return follow_aux(op1) + + + elseif action == "&" then + + return follow_aux(op1) + + elseif action == "!" then + + return {action="!", op1=follow_aux(op1)} + + elseif action == "+" then + + return follow_aux(op1) + + elseif action == "*" then + + return addepsilon(follow_aux(op1)) + + elseif action == "?" then + + return addepsilon(follow_aux(op1)) + + elseif action == "^" then + + op2 = op2["num"] + + if op2 >= 1 then + return follow_aux(op1) + else + return addepsilon(follow_aux(op1)) + end + + elseif action == "^LABEL" or action == "->" or action == "=>" or action == "tcap" or action == "gcap" or action == "subcap" or action == "scap" then + + return follow_aux(op1) + + elseif action == "bref" or action == "poscap" then + + return addepsilon({}) -- only empty string + + elseif action == "anychar" then + + return {"_anychar"} + + elseif action == "label" then + + return addepsilon({}) + + elseif action == "%" then + + return addepsilon({}) + + elseif action == "invert" then + + return {t} -- whole table + + elseif action == "range" then + + return {"_anychar"} + + else + error("Unsupported action '"..action.."'") + end +end + +-- function: follow +-- finds follow set for the whole AST, with key (rule, term) +local function follow (t) + local followset = {} + if isgrammar(t) then + for pos,val in pairs(t) do + local rule = val.rulename + FOLLOW = {} -- reset for each rule + follow_aux(val.rule) -- apply recursive function + followset[rule] = FOLLOW + end + else + FOLLOW = {} + follow_aux(t) + followset[''] = FOLLOW + end + return followset +end + +-- functions to add errors +-- find size of table +local function getn (t) + local size = 0 + for _, _ in pairs(t) do + size = size+1 + end + return size +end +-- generate error message by traversing table to the left +local function printexpect(op) + --peg.print_r(op) + if isfinal(op) then + if op["t"] then + return "'"..op["t"].."'" + end + return op["nt"] or op["func"] or op["s"] or op["num"] + else + local test = op.op1 + if not test then + return op.action + else + return printexpect(test) + end + end +end +local GENERATED_ERRORS = 0 +local TERRS = {} +local function generateerror(op, after) + + local desc = "Expected "..printexpect(op) + + local err = GENERATED_ERRORS+1 + if err >= 255 then + error("Error label limit reached(255)") + end + local name = "errorgen"..err + TERRS[name] = desc + GENERATED_ERRORS = GENERATED_ERRORS+1 + return name +end + + +local function tryadderror(op, after) + + if FOLLOW then + + local rhs = rightleaf(after) + -- (A / B) C + -- generate error iff #FOLLOW(A) OR #FOLLOW(B) = 1 + local generate = false + for k,v in pairs(rhs) do + if FOLLOW[v] then + local n = getn(FOLLOW[v]) + generate = generate or n==1 + end + end + if generate then + local lab = generateerror(op, after) + return {action="^LABEL",op1=op,op2={s=lab}} + end + end + return op +end + + +-- function: adderrors +-- traverses the AST and adds error labels where possible + +local function adderrors_aux(ast,tokenrule) + + if not ast then + return nil + end + + if isaction(ast) then + + local act, op1, op2 + act = ast["action"] + op1 = ast["op1"] + op2 = ast["op2"] + + if act == "and" and not tokenrule then + + op2 = tryadderror(op2, op1) + + end + + ast["op1"] = adderrors_aux(op1,tokenrule) + ast["op2"] = adderrors_aux(op2,tokenrule) + end + return ast +end +local function adderrors(t, followset) + GENERATED_ERRORS = 0 + TERRS = {} + if isgrammar(t) then + for pos,val in pairs(t) do + local currentrule = val.rulename + FOLLOW = followset[currentrule] + local rule = val.rule + local istokenrule = val.token == "1" + adderrors_aux(rule,istokenrule) + end + else + FOLLOW = followset[''] + adderrors_aux(t,false) + end + return TERRS +end + +return {follow=follow,adderrors=adderrors} diff --git a/06/parser-gen/parser-gen-tests.lua b/06/parser-gen/parser-gen-tests.lua new file mode 100644 index 0000000..522df52 --- /dev/null +++ b/06/parser-gen/parser-gen-tests.lua @@ -0,0 +1,160 @@ +local pg = require "parser-gen" +local peg = require "peg-parser" +local re = require "relabel" + +local eq = require "equals" + +local equals = eq.equals + + +local pr = peg.print_r + + +-- terminals +-- space allowed +rule = pg.compile [[ +rule <- 'a' +]] +str = "a a aa " +res = pg.parse(str,rule) +assert(res) + +-- space not allowed +rule = pg.compile [[ +RULE <- 'a' 'b' +]] +str = "a b" +res = pg.parse(str,rule) +assert(not res) + +-- space not allowed 2 +rule = pg.compile [[ +rule <- 'a' 'b' +SKIP <- '' +SYNC <- '' +]] +str = "a b" +res = pg.parse(str,rule) +assert(not res) + +-- custom space +rule = pg.compile [[ +rule <- 'a' 'b' +SKIP <- DOT +DOT <- '.' +]] +str = "a...b" +res = pg.parse(str,rule) +assert(res) + +-- non terminals +-- space allowed +rule = pg.compile [[ +rule <- A B +A <- 'a' +B <- 'b' +]] +str = "a b" +res, err = pg.parse(str,rule) +assert(res) +-- no spaces allowed +rule = pg.compile [[ +RULE <- A B +A <- 'a' +B <- 'b' +]] +str = "a b" +res = pg.parse(str,rule) +assert(not res) + +-- space in the beginning and end of string +rule = pg.compile [[ +rule <- A B +A <- 'a' +B <- 'b' +]] +str = " a b " +res = pg.parse(str,rule) +assert(res) + + + +-- TESTING CAPTURES + +r = pg.compile([[ rule <- {| {:'a' 'b':}* |} + + ]],_,_,true) +res = pg.parse("ababab", r) + +assert(equals(res,{"ab","ab","ab"})) +-- space in capture + +rule = pg.compile([[ rule <- {| {: 'a' :}* |} +]],_,_,true) +str = " a a a " +res = pg.parse(str,rule) + +assert(equals(res,{"a","a","a"})) -- fails + +-- TESTING ERROR LABELS +local labs = {errName = "Error number 1",errName2 = "Error number 2"} +pg.setlabels(labs) +rule = pg.compile [[ rule <- 'a' / %{errName} + SYNC <- '' + ]] +local errorcalled = false +local function err(desc, line, col, sfail, recexp) + errorcalled = true + assert(desc == "Error number 1") +end +res = pg.parse("b",rule,err) +assert(errorcalled) + +-- TESTING ERROR RECOVERY + +local labs = {errName = "Error number 1",errName2 = "Error number 2"} +pg.setlabels(labs) + +rule = pg.compile [[ +rule <- As //{errName,errName2} Bs +As <- 'a'* / %{errName2} +Bs <- 'b'* +]] +res1 = pg.parse(" a a a",rule) +res2 = pg.parse("b b b ",rule) +assert(res1 and res2) + +-- TESTING ERROR GENERATION + +pg.setlabels({}) +rule = pg.compile([[ +rule <- A B C +A <- 'a' +B <- 'b' +C <- 'c' + +]],_,true) +res1, errs = pg.parse("ab",rule) +assert(errs[1]["msg"] == "Expected C") + +-- TESTING RECOVERY GENERATION + + +-- SELF-DESCRIPTION +pg.setlabels(peg.labels) +gram = pg.compile(peg.gram, peg.defs,_,true) +res1, errs = pg.parse(peg.gram,gram) +assert(res1) -- parse succesful + +--[[ this test is invalid since tool added ^LABEL syntax +r = re.compile(peg.gram,peg.defs) +res2 = r:match(peg.gram) + +--peg.print_r(res2) + +assert(equals(res1, res2)) +]]-- + + + +print("all tests succesful") \ No newline at end of file diff --git a/06/parser-gen/parser-gen.lua b/06/parser-gen/parser-gen.lua new file mode 100644 index 0000000..99b6aec --- /dev/null +++ b/06/parser-gen/parser-gen.lua @@ -0,0 +1,566 @@ +local peg = require "parser-gen.peg-parser" +local eg = require "parser-gen.errorgen" +local s = require "parser-gen.stack" + +-- create stack for tokens inside captures. nil - not inside capture, 0 - inside capture, 1 - token found inside capture +local tokenstack = s.Stack:Create() + + + +local subject, errors, errorfunc + +-- Lua 5.1 compatibility: +local unpack = unpack or table.unpack + + +local Predef = { nl = m.P"\n", cr = m.P"\r", tab = m.P"\t" } + + +local mem = {} -- for compiled grammars + +local function updatelocale() + m.locale(Predef) + local any = m.P(1) + Predef.a = Predef.alpha + Predef.c = Predef.cntrl + Predef.d = Predef.digit + Predef.g = Predef.graph + Predef.l = Predef.lower + Predef.p = Predef.punct + Predef.s = Predef.space + Predef.u = Predef.upper + Predef.w = Predef.alnum + Predef.x = Predef.xdigit + Predef.A = any - Predef.a + Predef.C = any - Predef.c + Predef.D = any - Predef.d + Predef.G = any - Predef.g + Predef.L = any - Predef.l + Predef.P = any - Predef.p + Predef.S = any - Predef.s + Predef.U = any - Predef.u + Predef.W = any - Predef.w + Predef.X = any - Predef.x + mem = {} +end + +updatelocale() + +local definitions = {} +local tlabels = {} +local totallabels = 0 +local tlabelnames = {} -- reverse table +local tdescs = {} +local trecs = {} -- recovery for each error + + +local function defaultsync(patt) + return (m.P(1)^-1) * (-patt * m.P(1))^0 +end + +-- TODO: store these variables for each grammar +local SKIP = (Predef.space + Predef.nl) +local SYNC = defaultsync(SKIP) + + +local recovery = true +local skipspaces = true +local buildast = true + +local function sync (patt) + return patt --(-patt * m.P(1))^0 * patt^0 -- skip until we find the pattern and consume it(if we do) +end + + +local function pattspaces (patt) + if skipspaces then + return patt * SKIP^0 + else + return patt + end +end + +local function token (patt) + local incapture = tokenstack:pop() -- returns nil if not in capture + if not incapture then + return pattspaces(patt) + end + tokenstack:push(1) + return patt +end + + + + +-- functions used by the tool + +local function iscompiled (gr) + return m.type(gr) == "pattern" +end + +local function istoken (t) + return t["token"] == "1" +end + +local function isfinal(t) + return t["t"] or t["nt"] or t["func"] or t["s"] or t["num"] +end + +local function isaction(t) + return t["action"] +end + + +local function isrule(t) + return t and t["rulename"] +end +local function isgrammar(t) + if type(t) == "table" and not(t["action"]) then + return isrule(t[1]) + end + return false +end + +local function iscapture (action) + return action == "=>" or action == "gcap" or action == "scap" or action == "subcap" or action == "poscap" +end + +local function finalNode (t) + if t["t"] then + return"t",t["t"] -- terminal + elseif t["nt"] then + return "nt", t["nt"], istoken(t) -- nonterminal + elseif t["func"] then + return "func", t["func"] -- function + elseif t["s"] then + return "s", t["s"] + elseif t["num"] then + return "num", t["num"] + end + return nil +end +local bg = {} -- local variable to keep global function buildgrammar + + +local function addspaces (caps) + local hastoken = tokenstack:pop() + if hastoken == 1 then + return pattspaces(caps) + end + return caps +end + +local function applyaction(action, op1, op2, labels,tokenrule) + if action == "or" then + if labels then -- labels = {{s="errName"},{s="errName2"}} + for i, v in ipairs(labels) do + local labname = v["s"] + local lab = tlabels[labname] + if not lab then + error("Label '"..labname.."' undefined") + end + labels[i] = lab + end + return m.Rec(op1,op2,unpack(labels)) + end + return op1 + op2 + elseif action == "and" then + + return op1 * op2 + elseif action == "&" then + return #op1 + elseif action == "!" then + return -op1 + elseif action == "+" then + return op1^1 + elseif action == "*" then + return op1^0 + elseif action == "?" then + return op1^-1 + elseif action == "^" then + return op1^op2 + elseif action == "^LABEL" then + local lab = tlabels[op2] + if not lab then + error("Label '"..op2.."' unspecified using setlabels()") + end + return op1 + m.T(lab) + elseif action == "->" then + return op1 / op2 + -- in captures we add SPACES^0 + elseif action == "=>" then + return addspaces(m.Cmt(op1,op2)) + elseif action == "tcap" then + return m.Ct(op1) -- nospaces + elseif action == "gcap" then + return addspaces(m.Cg(op1, op2)) + elseif action == "bref" then + return m.Cb(op1) --m.Cmt(m.Cb(op1), equalcap) -- do we need to add spaces to bcap? + elseif action == "poscap" then + return addspaces(m.Cp()) + elseif action == "subcap" then + return addspaces(m.Cs(op1)) + elseif action == "scap" then + return addspaces(m.C(op1)) + elseif action == "anychar" then + if buildast and not tokenrule then + return m.C(m.P(1)) + end + return m.P(1) + elseif action == "label" then + local lab = tlabels[op1] + if not lab then + error("Label '"..op1.."' unspecified using setlabels()") + end + return m.T(lab) -- lpeglabel + elseif action == "%" then + if definitions[op1] then + return definitions[op1] + elseif Predef[op1] then + return Predef[op1] + else + error("Definition for '%"..op1.."' unspecified(use second parameter of parser-gen.compile())") + end + elseif action == "invert" then + return m.P(1) - op1 + elseif action == "range" then + local res = m.R(op1) + if not tokenrule then + if buildast then + res = m.C(res) + end + res = token(res) + end + return res + else + error("Unsupported action '"..action.."'") + end +end + +local function applyfinal(action, term, tokenterm, tokenrule) + + if action == "t" then + local res = m.P(term) + if not tokenrule then + if buildast then + res = m.C(res) + end + if skipspaces then + res = token(res) + end + end + return res + elseif action == "nt" then + if skipspaces and tokenterm and (not tokenrule) then + return token(m.V(term)) + else + return m.V(term) + end + elseif action == "func" then + if definitions[term] then + return definitions[term] + else + error("Definition for function '"..term.."' unspecified (use second parameter of parser-gen.compile())") + end + elseif action == "s" then -- simple string + return term + elseif action == "num" then -- numbered string + return tonumber(term) + end +end + + +local function applygrammar(gram) + return m.P(gram) +end + +local function traverse (ast, tokenrule) + if not ast then + return nil + end + + if isfinal(ast) then + local typefn, fn, tok = finalNode(ast) + return applyfinal(typefn, fn, tok, tokenrule) + + elseif isaction(ast) then + + local act, op1, op2, labs, ret1, ret2 + act = ast["action"] + op1 = ast["op1"] + op2 = ast["op2"] + labs = ast["condition"] -- recovery operations + + -- post-order traversal + if iscapture(act) then + tokenstack:push(0) -- not found any tokens yet + end + + ret1 = traverse(op1, tokenrule) + ret2 = traverse(op2, tokenrule) + + + return applyaction(act, ret1, ret2, labs, tokenrule) + + elseif isgrammar(ast) then + -- + local g = bg.buildgrammar (ast) + return applygrammar (g) + + else + peg.print_r(ast) + error("Unsupported AST") + end + +end + +local function specialrules(ast, builder) + -- initialize values + SKIP = (Predef.space + Predef.nl) + skipspaces = true + SYNC = nil + recovery = true + -- find SPACE and SYNC rules + for i, v in ipairs(ast) do + local name = v["rulename"] + local rule + if name == "SKIP" then + rule = traverse(v["rule"], true) + if v["rule"]["t"] == '' then + skipspaces = false + else + skipspaces = true + SKIP = rule + end + builder[name] = rule + elseif name == "SYNC" then + rule = traverse(v["rule"], true) + if v["rule"]["t"] == '' then-- SYNC <- '' + recovery=false + else + recovery= true + SYNC = rule + end + builder[name] = rule + end + end + if not SYNC and recovery then + SYNC = defaultsync(SKIP) + end +end + +local function recorderror(position,label) + -- call error function here + local line, col = peg.calcline(subject, position) + local desc + if label == 0 then + desc = "Syntax error" + else + desc = tdescs[label] + end + if errorfunc then + local temp = string.sub(subject,position) + local strend = string.find(temp, "\n") + local sfail = string.sub(temp, 1, strend) + errorfunc(desc,line,col,sfail,trecs[label]) + end + + local err = { line = line, col = col, label=tlabelnames[label], msg = desc } + table.insert(errors, err) + +end +local function record(label) + return (m.Cp() * m.Cc(label)) / recorderror +end + +local function buildrecovery(grammar) + + local synctoken = pattspaces(sync(SYNC)) + local grec = grammar + + for k,v in pairs(tlabels) do + + if trecs[v] then -- custom sync token + grec = m.Rec(grec,record(v) * pattspaces(trecs[v]), v) + else -- use global sync token + grec = m.Rec(grec,record(v) * synctoken, v) + end + end + return grec + +end +local usenode = false + +local function usenodes(val) + usenode = val +end + + +function bg.buildgrammar (ast) + local builder = {} + specialrules(ast, builder) + local initialrule + for i, v in ipairs(ast) do + local istokenrule = v["token"] == "1" + local isfragment = v["fragment"] == "1" + local isnode = v["node"] == "1" + + if isnode and not usenodes then + error("Node mode disabled - please use parser-gen.usenodes(true) before compiling the grammar") + end + + local name = v["rulename"] + local isspecial = name == "SKIP" or name == "SYNC" + local rule = v["rule"] + if i == 1 then + initialrule = name + table.insert(builder, name) -- lpeg syntax + builder[name] = traverse(rule, istokenrule) + else + if not builder[name] then -- dont traverse rules for SKIP and SYNC twice + builder[name] = traverse(rule, istokenrule) + end + end + if buildast and not isfragment and not isspecial and ((not usenode) or (usenode and isnode)) then + if istokenrule then + builder[name] = m.C(builder[name]) + end + builder[name] = m.Ct(m.Cg(m.Cc(name),"rule") * m.Cg(m.Cp(),"pos") * builder[name]) + end + end + + if skipspaces then + builder[initialrule] = SKIP^0 * builder[initialrule] -- skip spaces at the beginning of the input + end + if recovery then + builder[initialrule] = buildrecovery(builder[initialrule]) -- build recovery on top of initial rule + end + return builder +end + + + + +local function build(ast, defs) + if defs then + definitions = defs + end + if isgrammar(ast) then + return traverse(ast) + else + SKIP = (Predef.space + Predef.nl) + skipspaces = true + SYNC = nil + recovery = true + SYNC = defaultsync(SKIP) + local res = SKIP ^0 * traverse(ast) + if buildast then + res = m.Ct(res) + end + return res -- input is not a grammar - skip spaces and sync by default + end +end + + + +-- recovery grammar + + + + +-- end + + + +-- t = {errName="Error description",...} +local function setlabels (t, errorgen) + local index + if errorgen then + index = totallabels + 1 + else + -- reset error tables + index = 1 + tlabels = {} + + tdescs = {} + trecs = {} + end + for key,value in pairs(t) do + if index >= 255 then + error("Error label limit reached(255)") + end + if type(value) == "table" then -- we have a recovery expression + tdescs[index] = value[1] + + trecs[index] = traverse(peg.pegToAST(value[2]), true)-- PEG to LPEG + else + tdescs[index] = value + end + tlabels[key] = index + tlabelnames[index] = key -- reverse table + index = index + 1 + end + totallabels = index-1 +end + + +local function compile (input, defs, generrors, nocaptures) + if iscompiled(input) then + return input + end + if not mem[input] then + buildast = true + if nocaptures then + buildast=false + end + --re.setlabels(tlabels) + --re.compile(input,defs) + -- build ast + local ast = peg.pegToAST(input) + if generrors then + local follow = eg.follow(ast) + local errors = eg.adderrors(ast, follow) + setlabels (errors, true) -- add errors generated by errorgen + end + local gram = build(ast,defs) + if not gram then + -- find error using relabel module + + end + mem[input] = gram-- store if the user forgets to compile it + end + return mem[input] +end + + + + + + +local function parse (input, grammar, errorfunction) + if not iscompiled(grammar) then + + local cp = compile(grammar) + grammar = cp + end + -- set up recovery table + errorfunc = errorfunction + subject = input + errors = {} + -- end + local r, e, sfail = m.match(grammar,input) + if not r then + recorderror(#input - #sfail, e) + end + if #errors == 0 then errors=nil end + return r, errors +end + + + + + + +local pg = {compile=compile, setlabels=setlabels, parse=parse,follow=follow, calcline = peg.calcline, usenodes = usenodes} + +return pg diff --git a/06/parser-gen/parsers/lua-5.3.4-tests/all.lua b/06/parser-gen/parsers/lua-5.3.4-tests/all.lua new file mode 100644 index 0000000..23f3e1c --- /dev/null +++ b/06/parser-gen/parsers/lua-5.3.4-tests/all.lua @@ -0,0 +1,292 @@ +#!../lua +-- $Id: all.lua,v 1.95 2016/11/07 13:11:28 roberto Exp $ +-- See Copyright Notice at the end of this file + + + +local version = "Lua 5.3" +if _VERSION ~= version then + io.stderr:write("\nThis test suite is for ", version, ", not for ", _VERSION, + "\nExiting tests\n") + return +end + + +_G._ARG = arg -- save arg for other tests + + +-- next variables control the execution of some tests +-- true means no test (so an undefined variable does not skip a test) +-- defaults are for Linux; test everything. +-- Make true to avoid long or memory consuming tests +_soft = rawget(_G, "_soft") or false +-- Make true to avoid non-portable tests +_port = rawget(_G, "_port") or false +-- Make true to avoid messages about tests not performed +_nomsg = rawget(_G, "_nomsg") or false + + +local usertests = rawget(_G, "_U") + +if usertests then + -- tests for sissies ;) Avoid problems + _soft = true + _port = true + _nomsg = true +end + +-- tests should require debug when needed +debug = nil + +if usertests then + T = nil -- no "internal" tests for user tests +else + T = rawget(_G, "T") -- avoid problems with 'strict' module +end + +math.randomseed(0) + +--[=[ + example of a long [comment], + [[spanning several [lines]]] + +]=] + +print("current path:\n****" .. package.path .. "****\n") + + +local initclock = os.clock() +local lastclock = initclock +local walltime = os.time() + +local collectgarbage = collectgarbage + +do -- ( + +-- track messages for tests not performed +local msgs = {} +function Message (m) + if not _nomsg then + print(m) + msgs[#msgs+1] = string.sub(m, 3, -3) + end +end + +assert(os.setlocale"C") + +local T,print,format,write,assert,type,unpack,floor = + T,print,string.format,io.write,assert,type,table.unpack,math.floor + +-- use K for 1000 and M for 1000000 (not 2^10 -- 2^20) +local function F (m) + local function round (m) + m = m + 0.04999 + return format("%.1f", m) -- keep one decimal digit + end + if m < 1000 then return m + else + m = m / 1000 + if m < 1000 then return round(m).."K" + else + return round(m/1000).."M" + end + end +end + +local showmem +if not T then + local max = 0 + showmem = function () + local m = collectgarbage("count") * 1024 + max = (m > max) and m or max + print(format(" ---- total memory: %s, max memory: %s ----\n", + F(m), F(max))) + end +else + showmem = function () + T.checkmemory() + local total, numblocks, maxmem = T.totalmem() + local count = collectgarbage("count") + print(format( + "\n ---- total memory: %s (%.0fK), max use: %s, blocks: %d\n", + F(total), count, F(maxmem), numblocks)) + print(format("\t(strings: %d, tables: %d, functions: %d, ".. + "\n\tudata: %d, threads: %d)", + T.totalmem"string", T.totalmem"table", T.totalmem"function", + T.totalmem"userdata", T.totalmem"thread")) + end +end + + +-- +-- redefine dofile to run files through dump/undump +-- +local function report (n) print("\n***** FILE '"..n.."'*****") end +local olddofile = dofile +local dofile = function (n, strip) + showmem() + local c = os.clock() + print(string.format("time: %g (+%g)", c - initclock, c - lastclock)) + lastclock = c + report(n) + local f = assert(loadfile(n)) + local b = string.dump(f, strip) + f = assert(load(b)) + return f() +end + +dofile('main.lua') + +do + local next, setmetatable, stderr = next, setmetatable, io.stderr + -- track collections + local mt = {} + -- each time a table is collected, remark it for finalization + -- on next cycle + mt.__gc = function (o) + stderr:write'.' -- mark progress + local n = setmetatable(o, mt) -- remark it + end + local n = setmetatable({}, mt) -- create object +end + +report"gc.lua" +local f = assert(loadfile('gc.lua')) +f() + +dofile('db.lua') +assert(dofile('calls.lua') == deep and deep) +olddofile('strings.lua') +olddofile('literals.lua') +dofile('tpack.lua') +assert(dofile('attrib.lua') == 27) + +assert(dofile('locals.lua') == 5) +dofile('constructs.lua') +dofile('code.lua', true) +if not _G._soft then + report('big.lua') + local f = coroutine.wrap(assert(loadfile('big.lua'))) + assert(f() == 'b') + assert(f() == 'a') +end +dofile('nextvar.lua') +dofile('pm.lua') +dofile('utf8.lua') +dofile('api.lua') +assert(dofile('events.lua') == 12) +dofile('vararg.lua') +dofile('closure.lua') +dofile('coroutine.lua') +dofile('goto.lua', true) +dofile('errors.lua') +dofile('math.lua') +dofile('sort.lua', true) +dofile('bitwise.lua') +assert(dofile('verybig.lua', true) == 10); collectgarbage() +dofile('files.lua') + +if #msgs > 0 then + print("\ntests not performed:") + for i=1,#msgs do + print(msgs[i]) + end + print() +end + +-- no test module should define 'debug' +assert(debug == nil) + +local debug = require "debug" + +print(string.format("%d-bit integers, %d-bit floats", + string.packsize("j") * 8, string.packsize("n") * 8)) + +debug.sethook(function (a) assert(type(a) == 'string') end, "cr") + +-- to survive outside block +_G.showmem = showmem + +end --) + +local _G, showmem, print, format, clock, time, difftime, assert, open = + _G, showmem, print, string.format, os.clock, os.time, os.difftime, + assert, io.open + +-- file with time of last performed test +local fname = T and "time-debug.txt" or "time.txt" +local lasttime + +if not usertests then + -- open file with time of last performed test + local f = io.open(fname) + if f then + lasttime = assert(tonumber(f:read'a')) + f:close(); + else -- no such file; assume it is recording time for first time + lasttime = nil + end +end + +-- erase (almost) all globals +print('cleaning all!!!!') +for n in pairs(_G) do + if not ({___Glob = 1, tostring = 1})[n] then + _G[n] = nil + end +end + + +collectgarbage() +collectgarbage() +collectgarbage() +collectgarbage() +collectgarbage() +collectgarbage();showmem() + +local clocktime = clock() - initclock +walltime = difftime(time(), walltime) + +print(format("\n\ntotal time: %.2fs (wall time: %gs)\n", clocktime, walltime)) + +if not usertests then + lasttime = lasttime or clocktime -- if no last time, ignore difference + -- check whether current test time differs more than 5% from last time + local diff = (clocktime - lasttime) / lasttime + local tolerance = 0.05 -- 5% + if (diff >= tolerance or diff <= -tolerance) then + print(format("WARNING: time difference from previous test: %+.1f%%", + diff * 100)) + end + assert(open(fname, "w")):write(clocktime):close() +end + +print("final OK !!!") + + + +--[[ +***************************************************************************** +* Copyright (C) 1994-2016 Lua.org, PUC-Rio. +* +* Permission is hereby granted, free of charge, to any person obtaining +* a copy of this software and associated documentation files (the +* "Software"), to deal in the Software without restriction, including +* without limitation the rights to use, copy, modify, merge, publish, +* distribute, sublicense, and/or sell copies of the Software, and to +* permit persons to whom the Software is furnished to do so, subject to +* the following conditions: +* +* The above copyright notice and this permission notice shall be +* included in all copies or substantial portions of the Software. +* +* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, +* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. +* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY +* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, +* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE +* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. +***************************************************************************** +]] + diff --git a/06/parser-gen/parsers/lua-5.3.4-tests/api.lua b/06/parser-gen/parsers/lua-5.3.4-tests/api.lua new file mode 100644 index 0000000..c27ee97 --- /dev/null +++ b/06/parser-gen/parsers/lua-5.3.4-tests/api.lua @@ -0,0 +1,1172 @@ +-- $Id: api.lua,v 1.147 2016/11/07 13:06:25 roberto Exp $ +-- See Copyright Notice in file all.lua + +if T==nil then + (Message or print)('\n >>> testC not active: skipping API tests <<<\n') + return +end + +local debug = require "debug" + +local pack = table.pack + + +function tcheck (t1, t2) + assert(t1.n == (t2.n or #t2) + 1) + for i = 2, t1.n do assert(t1[i] == t2[i - 1]) end +end + + +local function checkerr (msg, f, ...) + local stat, err = pcall(f, ...) + assert(not stat and string.find(err, msg)) +end + + +print('testing C API') + +a = T.testC("pushvalue R; return 1") +assert(a == debug.getregistry()) + + +-- absindex +assert(T.testC("settop 10; absindex -1; return 1") == 10) +assert(T.testC("settop 5; absindex -5; return 1") == 1) +assert(T.testC("settop 10; absindex 1; return 1") == 1) +assert(T.testC("settop 10; absindex R; return 1") < -10) + +-- testing alignment +a = T.d2s(12458954321123.0) +assert(a == string.pack("d", 12458954321123.0)) +assert(T.s2d(a) == 12458954321123.0) + +a,b,c = T.testC("pushnum 1; pushnum 2; pushnum 3; return 2") +assert(a == 2 and b == 3 and not c) + +f = T.makeCfunc("pushnum 1; pushnum 2; pushnum 3; return 2") +a,b,c = f() +assert(a == 2 and b == 3 and not c) + +-- test that all trues are equal +a,b,c = T.testC("pushbool 1; pushbool 2; pushbool 0; return 3") +assert(a == b and a == true and c == false) +a,b,c = T.testC"pushbool 0; pushbool 10; pushnil;\ + tobool -3; tobool -3; tobool -3; return 3" +assert(a==false and b==true and c==false) + + +a,b,c = T.testC("gettop; return 2", 10, 20, 30, 40) +assert(a == 40 and b == 5 and not c) + +t = pack(T.testC("settop 5; return *", 2, 3)) +tcheck(t, {n=4,2,3}) + +t = pack(T.testC("settop 0; settop 15; return 10", 3, 1, 23)) +assert(t.n == 10 and t[1] == nil and t[10] == nil) + +t = pack(T.testC("remove -2; return *", 2, 3, 4)) +tcheck(t, {n=2,2,4}) + +t = pack(T.testC("insert -1; return *", 2, 3)) +tcheck(t, {n=2,2,3}) + +t = pack(T.testC("insert 3; return *", 2, 3, 4, 5)) +tcheck(t, {n=4,2,5,3,4}) + +t = pack(T.testC("replace 2; return *", 2, 3, 4, 5)) +tcheck(t, {n=3,5,3,4}) + +t = pack(T.testC("replace -2; return *", 2, 3, 4, 5)) +tcheck(t, {n=3,2,3,5}) + +t = pack(T.testC("remove 3; return *", 2, 3, 4, 5)) +tcheck(t, {n=3,2,4,5}) + +t = pack(T.testC("copy 3 4; return *", 2, 3, 4, 5)) +tcheck(t, {n=4,2,3,3,5}) + +t = pack(T.testC("copy -3 -1; return *", 2, 3, 4, 5)) +tcheck(t, {n=4,2,3,4,3}) + +do -- testing 'rotate' + local t = {10, 20, 30, 40, 50, 60} + for i = -6, 6 do + local s = string.format("rotate 2 %d; return 7", i) + local t1 = pack(T.testC(s, 10, 20, 30, 40, 50, 60)) + tcheck(t1, t) + table.insert(t, 1, table.remove(t)) + end + + t = pack(T.testC("rotate -2 1; return *", 10, 20, 30, 40)) + tcheck(t, {10, 20, 40, 30}) + t = pack(T.testC("rotate -2 -1; return *", 10, 20, 30, 40)) + tcheck(t, {10, 20, 40, 30}) + + -- some corner cases + t = pack(T.testC("rotate -1 0; return *", 10, 20, 30, 40)) + tcheck(t, {10, 20, 30, 40}) + t = pack(T.testC("rotate -1 1; return *", 10, 20, 30, 40)) + tcheck(t, {10, 20, 30, 40}) + t = pack(T.testC("rotate 5 -1; return *", 10, 20, 30, 40)) + tcheck(t, {10, 20, 30, 40}) +end + +-- testing non-function message handlers +do + local f = T.makeCfunc[[ + getglobal error + pushstring bola + pcall 1 1 1 # call 'error' with given handler + pushstatus + return 2 # return error message and status + ]] + + local msg, st = f({}) -- invalid handler + assert(st == "ERRERR" and string.find(msg, "error handling")) + local msg, st = f(nil) -- invalid handler + assert(st == "ERRERR" and string.find(msg, "error handling")) + + local a = setmetatable({}, {__call = function (_, x) return x:upper() end}) + local msg, st = f(a) -- callable handler + assert(st == "ERRRUN" and msg == "BOLA") +end + +t = pack(T.testC("insert 3; pushvalue 3; remove 3; pushvalue 2; remove 2; \ + insert 2; pushvalue 1; remove 1; insert 1; \ + insert -2; pushvalue -2; remove -3; return *", + 2, 3, 4, 5, 10, 40, 90)) +tcheck(t, {n=7,2,3,4,5,10,40,90}) + +t = pack(T.testC("concat 5; return *", "alo", 2, 3, "joao", 12)) +tcheck(t, {n=1,"alo23joao12"}) + +-- testing MULTRET +t = pack(T.testC("call 2,-1; return *", + function (a,b) return 1,2,3,4,a,b end, "alo", "joao")) +tcheck(t, {n=6,1,2,3,4,"alo", "joao"}) + +do -- test returning more results than fit in the caller stack + local a = {} + for i=1,1000 do a[i] = true end; a[999] = 10 + local b = T.testC([[pcall 1 -1 0; pop 1; tostring -1; return 1]], + table.unpack, a) + assert(b == "10") +end + + +-- testing globals +_G.a = 14; _G.b = "a31" +local a = {T.testC[[ + getglobal a; + getglobal b; + getglobal b; + setglobal a; + return * +]]} +assert(a[2] == 14 and a[3] == "a31" and a[4] == nil and _G.a == "a31") + + +-- testing arith +assert(T.testC("pushnum 10; pushnum 20; arith /; return 1") == 0.5) +assert(T.testC("pushnum 10; pushnum 20; arith -; return 1") == -10) +assert(T.testC("pushnum 10; pushnum -20; arith *; return 1") == -200) +assert(T.testC("pushnum 10; pushnum 3; arith ^; return 1") == 1000) +assert(T.testC("pushnum 10; pushstring 20; arith /; return 1") == 0.5) +assert(T.testC("pushstring 10; pushnum 20; arith -; return 1") == -10) +assert(T.testC("pushstring 10; pushstring -20; arith *; return 1") == -200) +assert(T.testC("pushstring 10; pushstring 3; arith ^; return 1") == 1000) +assert(T.testC("arith /; return 1", 2, 0) == 10.0/0) +a = T.testC("pushnum 10; pushint 3; arith \\; return 1") +assert(a == 3.0 and math.type(a) == "float") +a = T.testC("pushint 10; pushint 3; arith \\; return 1") +assert(a == 3 and math.type(a) == "integer") +a = assert(T.testC("pushint 10; pushint 3; arith +; return 1")) +assert(a == 13 and math.type(a) == "integer") +a = assert(T.testC("pushnum 10; pushint 3; arith +; return 1")) +assert(a == 13 and math.type(a) == "float") +a,b,c = T.testC([[pushnum 1; + pushstring 10; arith _; + pushstring 5; return 3]]) +assert(a == 1 and b == -10 and c == "5") +mt = {__add = function (a,b) return setmetatable({a[1] + b[1]}, mt) end, + __mod = function (a,b) return setmetatable({a[1] % b[1]}, mt) end, + __unm = function (a) return setmetatable({a[1]* 2}, mt) end} +a,b,c = setmetatable({4}, mt), + setmetatable({8}, mt), + setmetatable({-3}, mt) +x,y,z = T.testC("arith +; return 2", 10, a, b) +assert(x == 10 and y[1] == 12 and z == nil) +assert(T.testC("arith %; return 1", a, c)[1] == 4%-3) +assert(T.testC("arith _; arith +; arith %; return 1", b, a, c)[1] == + 8 % (4 + (-3)*2)) + +-- errors in arithmetic +checkerr("divide by zero", T.testC, "arith \\", 10, 0) +checkerr("%%0", T.testC, "arith %", 10, 0) + + +-- testing lessthan and lessequal +assert(T.testC("compare LT 2 5, return 1", 3, 2, 2, 4, 2, 2)) +assert(T.testC("compare LE 2 5, return 1", 3, 2, 2, 4, 2, 2)) +assert(not T.testC("compare LT 3 4, return 1", 3, 2, 2, 4, 2, 2)) +assert(T.testC("compare LE 3 4, return 1", 3, 2, 2, 4, 2, 2)) +assert(T.testC("compare LT 5 2, return 1", 4, 2, 2, 3, 2, 2)) +assert(not T.testC("compare LT 2 -3, return 1", "4", "2", "2", "3", "2", "2")) +assert(not T.testC("compare LT -3 2, return 1", "3", "2", "2", "4", "2", "2")) + +-- non-valid indices produce false +assert(not T.testC("compare LT 1 4, return 1")) +assert(not T.testC("compare LE 9 1, return 1")) +assert(not T.testC("compare EQ 9 9, return 1")) + +local b = {__lt = function (a,b) return a[1] < b[1] end} +local a1,a3,a4 = setmetatable({1}, b), + setmetatable({3}, b), + setmetatable({4}, b) +assert(T.testC("compare LT 2 5, return 1", a3, 2, 2, a4, 2, 2)) +assert(T.testC("compare LE 2 5, return 1", a3, 2, 2, a4, 2, 2)) +assert(T.testC("compare LT 5 -6, return 1", a4, 2, 2, a3, 2, 2)) +a,b = T.testC("compare LT 5 -6, return 2", a1, 2, 2, a3, 2, 20) +assert(a == 20 and b == false) +a,b = T.testC("compare LE 5 -6, return 2", a1, 2, 2, a3, 2, 20) +assert(a == 20 and b == false) +a,b = T.testC("compare LE 5 -6, return 2", a1, 2, 2, a1, 2, 20) +assert(a == 20 and b == true) + +-- testing length +local t = setmetatable({x = 20}, {__len = function (t) return t.x end}) +a,b,c = T.testC([[ + len 2; + Llen 2; + objsize 2; + return 3 +]], t) +assert(a == 20 and b == 20 and c == 0) + +t.x = "234"; t[1] = 20 +a,b,c = T.testC([[ + len 2; + Llen 2; + objsize 2; + return 3 +]], t) +assert(a == "234" and b == 234 and c == 1) + +t.x = print; t[1] = 20 +a,c = T.testC([[ + len 2; + objsize 2; + return 2 +]], t) +assert(a == print and c == 1) + + +-- testing __concat + +a = setmetatable({x="u"}, {__concat = function (a,b) return a.x..'.'..b.x end}) +x,y = T.testC([[ + pushnum 5 + pushvalue 2; + pushvalue 2; + concat 2; + pushvalue -2; + return 2; +]], a, a) +assert(x == a..a and y == 5) + +-- concat with 0 elements +assert(T.testC("concat 0; return 1") == "") + +-- concat with 1 element +assert(T.testC("concat 1; return 1", "xuxu") == "xuxu") + + + +-- testing lua_is + +function B(x) return x and 1 or 0 end + +function count (x, n) + n = n or 2 + local prog = [[ + isnumber %d; + isstring %d; + isfunction %d; + iscfunction %d; + istable %d; + isuserdata %d; + isnil %d; + isnull %d; + return 8 + ]] + prog = string.format(prog, n, n, n, n, n, n, n, n) + local a,b,c,d,e,f,g,h = T.testC(prog, x) + return B(a)+B(b)+B(c)+B(d)+B(e)+B(f)+B(g)+(100*B(h)) +end + +assert(count(3) == 2) +assert(count('alo') == 1) +assert(count('32') == 2) +assert(count({}) == 1) +assert(count(print) == 2) +assert(count(function () end) == 1) +assert(count(nil) == 1) +assert(count(io.stdin) == 1) +assert(count(nil, 15) == 100) + + +-- testing lua_to... + +function to (s, x, n) + n = n or 2 + return T.testC(string.format("%s %d; return 1", s, n), x) +end + +local hfunc = string.gmatch("", "") -- a "heavy C function" (with upvalues) +assert(debug.getupvalue(hfunc, 1)) +assert(to("tostring", {}) == nil) +assert(to("tostring", "alo") == "alo") +assert(to("tostring", 12) == "12") +assert(to("tostring", 12, 3) == nil) +assert(to("objsize", {}) == 0) +assert(to("objsize", {1,2,3}) == 3) +assert(to("objsize", "alo\0\0a") == 6) +assert(to("objsize", T.newuserdata(0)) == 0) +assert(to("objsize", T.newuserdata(101)) == 101) +assert(to("objsize", 124) == 0) +assert(to("objsize", true) == 0) +assert(to("tonumber", {}) == 0) +assert(to("tonumber", "12") == 12) +assert(to("tonumber", "s2") == 0) +assert(to("tonumber", 1, 20) == 0) +assert(to("topointer", 10) == 0) +assert(to("topointer", true) == 0) +assert(to("topointer", T.pushuserdata(20)) == 20) +assert(to("topointer", io.read) ~= 0) -- light C function +assert(to("topointer", hfunc) ~= 0) -- "heavy" C function +assert(to("topointer", function () end) ~= 0) -- Lua function +assert(to("topointer", io.stdin) ~= 0) -- full userdata +assert(to("func2num", 20) == 0) +assert(to("func2num", T.pushuserdata(10)) == 0) +assert(to("func2num", io.read) ~= 0) -- light C function +assert(to("func2num", hfunc) ~= 0) -- "heavy" C function (with upvalue) +a = to("tocfunction", math.deg) +assert(a(3) == math.deg(3) and a == math.deg) + + +print("testing panic function") +do + -- trivial error + assert(T.checkpanic("pushstring hi; error") == "hi") + + -- using the stack inside panic + assert(T.checkpanic("pushstring hi; error;", + [[checkstack 5 XX + pushstring ' alo' + pushstring ' mundo' + concat 3]]) == "hi alo mundo") + + -- "argerror" without frames + assert(T.checkpanic("loadstring 4") == + "bad argument #4 (string expected, got no value)") + + + -- memory error + T.totalmem(T.totalmem()+10000) -- set low memory limit (+10k) + assert(T.checkpanic("newuserdata 20000") == "not enough memory") + T.totalmem(0) -- restore high limit + + -- stack error + if not _soft then + local msg = T.checkpanic[[ + pushstring "function f() f() end" + loadstring -1; call 0 0 + getglobal f; call 0 0 + ]] + assert(string.find(msg, "stack overflow")) + end + +end + +-- testing deep C stack +if not _soft then + print("testing stack overflow") + collectgarbage("stop") + checkerr("XXXX", T.testC, "checkstack 1000023 XXXX") -- too deep + -- too deep (with no message) + checkerr("^stack overflow$", T.testC, "checkstack 1000023 ''") + local s = string.rep("pushnil;checkstack 1 XX;", 1000000) + checkerr("overflow", T.testC, s) + collectgarbage("restart") + print'+' +end + +local lim = _soft and 500 or 12000 +local prog = {"checkstack " .. (lim * 2 + 100) .. "msg", "newtable"} +for i = 1,lim do + prog[#prog + 1] = "pushnum " .. i + prog[#prog + 1] = "pushnum " .. i * 10 +end + +prog[#prog + 1] = "rawgeti R 2" -- get global table in registry +prog[#prog + 1] = "insert " .. -(2*lim + 2) + +for i = 1,lim do + prog[#prog + 1] = "settable " .. -(2*(lim - i + 1) + 1) +end + +prog[#prog + 1] = "return 2" + +prog = table.concat(prog, ";") +local g, t = T.testC(prog) +assert(g == _G) +for i = 1,lim do assert(t[i] == i*10); t[i] = nil end +assert(next(t) == nil) +prog, g, t = nil + +-- testing errors + +a = T.testC([[ + loadstring 2; pcall 0 1 0; + pushvalue 3; insert -2; pcall 1 1 0; + pcall 0 0 0; + return 1 +]], "x=150", function (a) assert(a==nil); return 3 end) + +assert(type(a) == 'string' and x == 150) + +function check3(p, ...) + local arg = {...} + assert(#arg == 3) + assert(string.find(arg[3], p)) +end +check3(":1:", T.testC("loadstring 2; return *", "x=")) +check3("%.", T.testC("loadfile 2; return *", ".")) +check3("xxxx", T.testC("loadfile 2; return *", "xxxx")) + +-- test errors in non protected threads +function checkerrnopro (code, msg) + local th = coroutine.create(function () end) -- create new thread + local stt, err = pcall(T.testC, th, code) -- run code there + assert(not stt and string.find(err, msg)) +end + +if not _soft then + checkerrnopro("pushnum 3; call 0 0", "attempt to call") + print"testing stack overflow in unprotected thread" + function f () f() end + checkerrnopro("getglobal 'f'; call 0 0;", "stack overflow") +end +print"+" + + +-- testing table access + +do -- getp/setp + local a = {} + T.testC("rawsetp 2 1", a, 20) + assert(a[T.pushuserdata(1)] == 20) + assert(T.testC("rawgetp 2 1; return 1", a) == 20) +end + +a = {x=0, y=12} +x, y = T.testC("gettable 2; pushvalue 4; gettable 2; return 2", + a, 3, "y", 4, "x") +assert(x == 0 and y == 12) +T.testC("settable -5", a, 3, 4, "x", 15) +assert(a.x == 15) +a[a] = print +x = T.testC("gettable 2; return 1", a) -- table and key are the same object! +assert(x == print) +T.testC("settable 2", a, "x") -- table and key are the same object! +assert(a[a] == "x") + +b = setmetatable({p = a}, {}) +getmetatable(b).__index = function (t, i) return t.p[i] end +k, x = T.testC("gettable 3, return 2", 4, b, 20, 35, "x") +assert(x == 15 and k == 35) +k = T.testC("getfield 2 y, return 1", b) +assert(k == 12) +getmetatable(b).__index = function (t, i) return a[i] end +getmetatable(b).__newindex = function (t, i,v ) a[i] = v end +y = T.testC("insert 2; gettable -5; return 1", 2, 3, 4, "y", b) +assert(y == 12) +k = T.testC("settable -5, return 1", b, 3, 4, "x", 16) +assert(a.x == 16 and k == 4) +a[b] = 'xuxu' +y = T.testC("gettable 2, return 1", b) +assert(y == 'xuxu') +T.testC("settable 2", b, 19) +assert(a[b] == 19) + +-- +do -- testing getfield/setfield with long keys + local t = {_012345678901234567890123456789012345678901234567890123456789 = 32} + local a = T.testC([[ + getfield 2 _012345678901234567890123456789012345678901234567890123456789 + return 1 + ]], t) + assert(a == 32) + local a = T.testC([[ + pushnum 33 + setglobal _012345678901234567890123456789012345678901234567890123456789 + ]]) + assert(_012345678901234567890123456789012345678901234567890123456789 == 33) + _012345678901234567890123456789012345678901234567890123456789 = nil +end + +-- testing next +a = {} +t = pack(T.testC("next; return *", a, nil)) +tcheck(t, {n=1,a}) +a = {a=3} +t = pack(T.testC("next; return *", a, nil)) +tcheck(t, {n=3,a,'a',3}) +t = pack(T.testC("next; pop 1; next; return *", a, nil)) +tcheck(t, {n=1,a}) + + + +-- testing upvalues + +do + local A = T.testC[[ pushnum 10; pushnum 20; pushcclosure 2; return 1]] + t, b, c = A([[pushvalue U0; pushvalue U1; pushvalue U2; return 3]]) + assert(b == 10 and c == 20 and type(t) == 'table') + a, b = A([[tostring U3; tonumber U4; return 2]]) + assert(a == nil and b == 0) + A([[pushnum 100; pushnum 200; replace U2; replace U1]]) + b, c = A([[pushvalue U1; pushvalue U2; return 2]]) + assert(b == 100 and c == 200) + A([[replace U2; replace U1]], {x=1}, {x=2}) + b, c = A([[pushvalue U1; pushvalue U2; return 2]]) + assert(b.x == 1 and c.x == 2) + T.checkmemory() +end + + +-- testing absent upvalues from C-function pointers +assert(T.testC[[isnull U1; return 1]] == true) +assert(T.testC[[isnull U100; return 1]] == true) +assert(T.testC[[pushvalue U1; return 1]] == nil) + +local f = T.testC[[ pushnum 10; pushnum 20; pushcclosure 2; return 1]] +assert(T.upvalue(f, 1) == 10 and + T.upvalue(f, 2) == 20 and + T.upvalue(f, 3) == nil) +T.upvalue(f, 2, "xuxu") +assert(T.upvalue(f, 2) == "xuxu") + + +-- large closures +do + local A = "checkstack 300 msg;" .. + string.rep("pushnum 10;", 255) .. + "pushcclosure 255; return 1" + A = T.testC(A) + for i=1,255 do + assert(A(("pushvalue U%d; return 1"):format(i)) == 10) + end + assert(A("isnull U256; return 1")) + assert(not A("isnil U256; return 1")) +end + + + +-- testing get/setuservalue +-- bug in 5.1.2 +checkerr("got number", debug.setuservalue, 3, {}) +checkerr("got nil", debug.setuservalue, nil, {}) +checkerr("got light userdata", debug.setuservalue, T.pushuserdata(1), {}) + +local b = T.newuserdata(0) +assert(debug.getuservalue(b) == nil) +for _, v in pairs{true, false, 4.56, print, {}, b, "XYZ"} do + assert(debug.setuservalue(b, v) == b) + assert(debug.getuservalue(b) == v) +end + +assert(debug.getuservalue(4) == nil) + +debug.setuservalue(b, function () return 10 end) +collectgarbage() -- function should not be collected +assert(debug.getuservalue(b)() == 10) + +debug.setuservalue(b, 134) +collectgarbage() -- number should not be a problem for collector +assert(debug.getuservalue(b) == 134) + +-- test barrier for uservalues +T.gcstate("atomic") +assert(T.gccolor(b) == "black") +debug.setuservalue(b, {x = 100}) +T.gcstate("pause") -- complete collection +assert(debug.getuservalue(b).x == 100) -- uvalue should be there + +-- long chain of userdata +for i = 1, 1000 do + local bb = T.newuserdata(0) + debug.setuservalue(bb, b) + b = bb +end +collectgarbage() -- nothing should not be collected +for i = 1, 1000 do + b = debug.getuservalue(b) +end +assert(debug.getuservalue(b).x == 100) +b = nil + + +-- testing locks (refs) + +-- reuse of references +local i = T.ref{} +T.unref(i) +assert(T.ref{} == i) + +Arr = {} +Lim = 100 +for i=1,Lim do -- lock many objects + Arr[i] = T.ref({}) +end + +assert(T.ref(nil) == -1 and T.getref(-1) == nil) +T.unref(-1); T.unref(-1) + +for i=1,Lim do -- unlock all them + T.unref(Arr[i]) +end + +function printlocks () + local f = T.makeCfunc("gettable R; return 1") + local n = f("n") + print("n", n) + for i=0,n do + print(i, f(i)) + end +end + + +for i=1,Lim do -- lock many objects + Arr[i] = T.ref({}) +end + +for i=1,Lim,2 do -- unlock half of them + T.unref(Arr[i]) +end + +assert(type(T.getref(Arr[2])) == 'table') + + +assert(T.getref(-1) == nil) + + +a = T.ref({}) + +collectgarbage() + +assert(type(T.getref(a)) == 'table') + + +-- colect in cl the `val' of all collected userdata +tt = {} +cl = {n=0} +A = nil; B = nil +local F +F = function (x) + local udval = T.udataval(x) + table.insert(cl, udval) + local d = T.newuserdata(100) -- cria lixo + d = nil + assert(debug.getmetatable(x).__gc == F) + assert(load("table.insert({}, {})"))() -- cria mais lixo + collectgarbage() -- forca coleta de lixo durante coleta! + assert(debug.getmetatable(x).__gc == F) -- coleta anterior nao melou isso? + local dummy = {} -- cria lixo durante coleta + if A ~= nil then + assert(type(A) == "userdata") + assert(T.udataval(A) == B) + debug.getmetatable(A) -- just acess it + end + A = x -- ressucita userdata + B = udval + return 1,2,3 +end +tt.__gc = F + +-- test whether udate collection frees memory in the right time +do + collectgarbage(); + collectgarbage(); + local x = collectgarbage("count"); + local a = T.newuserdata(5001) + assert(T.testC("objsize 2; return 1", a) == 5001) + assert(collectgarbage("count") >= x+4) + a = nil + collectgarbage(); + assert(collectgarbage("count") <= x+1) + -- udata without finalizer + x = collectgarbage("count") + collectgarbage("stop") + for i=1,1000 do T.newuserdata(0) end + assert(collectgarbage("count") > x+10) + collectgarbage() + assert(collectgarbage("count") <= x+1) + -- udata with finalizer + collectgarbage() + x = collectgarbage("count") + collectgarbage("stop") + a = {__gc = function () end} + for i=1,1000 do debug.setmetatable(T.newuserdata(0), a) end + assert(collectgarbage("count") >= x+10) + collectgarbage() -- this collection only calls TM, without freeing memory + assert(collectgarbage("count") >= x+10) + collectgarbage() -- now frees memory + assert(collectgarbage("count") <= x+1) + collectgarbage("restart") +end + + +collectgarbage("stop") + +-- create 3 userdatas with tag `tt' +a = T.newuserdata(0); debug.setmetatable(a, tt); na = T.udataval(a) +b = T.newuserdata(0); debug.setmetatable(b, tt); nb = T.udataval(b) +c = T.newuserdata(0); debug.setmetatable(c, tt); nc = T.udataval(c) + +-- create userdata without meta table +x = T.newuserdata(4) +y = T.newuserdata(0) + +checkerr("FILE%* expected, got userdata", io.input, a) +checkerr("FILE%* expected, got userdata", io.input, x) + +assert(debug.getmetatable(x) == nil and debug.getmetatable(y) == nil) + +d=T.ref(a); +e=T.ref(b); +f=T.ref(c); +t = {T.getref(d), T.getref(e), T.getref(f)} +assert(t[1] == a and t[2] == b and t[3] == c) + +t=nil; a=nil; c=nil; +T.unref(e); T.unref(f) + +collectgarbage() + +-- check that unref objects have been collected +assert(#cl == 1 and cl[1] == nc) + +x = T.getref(d) +assert(type(x) == 'userdata' and debug.getmetatable(x) == tt) +x =nil +tt.b = b -- create cycle +tt=nil -- frees tt for GC +A = nil +b = nil +T.unref(d); +n5 = T.newuserdata(0) +debug.setmetatable(n5, {__gc=F}) +n5 = T.udataval(n5) +collectgarbage() +assert(#cl == 4) +-- check order of collection +assert(cl[2] == n5 and cl[3] == nb and cl[4] == na) + +collectgarbage"restart" + + +a, na = {}, {} +for i=30,1,-1 do + a[i] = T.newuserdata(0) + debug.setmetatable(a[i], {__gc=F}) + na[i] = T.udataval(a[i]) +end +cl = {} +a = nil; collectgarbage() +assert(#cl == 30) +for i=1,30 do assert(cl[i] == na[i]) end +na = nil + + +for i=2,Lim,2 do -- unlock the other half + T.unref(Arr[i]) +end + +x = T.newuserdata(41); debug.setmetatable(x, {__gc=F}) +assert(T.testC("objsize 2; return 1", x) == 41) +cl = {} +a = {[x] = 1} +x = T.udataval(x) +collectgarbage() +-- old `x' cannot be collected (`a' still uses it) +assert(#cl == 0) +for n in pairs(a) do a[n] = nil end +collectgarbage() +assert(#cl == 1 and cl[1] == x) -- old `x' must be collected + +-- testing lua_equal +assert(T.testC("compare EQ 2 4; return 1", print, 1, print, 20)) +assert(T.testC("compare EQ 3 2; return 1", 'alo', "alo")) +assert(T.testC("compare EQ 2 3; return 1", nil, nil)) +assert(not T.testC("compare EQ 2 3; return 1", {}, {})) +assert(not T.testC("compare EQ 2 3; return 1")) +assert(not T.testC("compare EQ 2 3; return 1", 3)) + +-- testing lua_equal with fallbacks +do + local map = {} + local t = {__eq = function (a,b) return map[a] == map[b] end} + local function f(x) + local u = T.newuserdata(0) + debug.setmetatable(u, t) + map[u] = x + return u + end + assert(f(10) == f(10)) + assert(f(10) ~= f(11)) + assert(T.testC("compare EQ 2 3; return 1", f(10), f(10))) + assert(not T.testC("compare EQ 2 3; return 1", f(10), f(20))) + t.__eq = nil + assert(f(10) ~= f(10)) +end + +print'+' + + + +-- testing changing hooks during hooks +_G.t = {} +T.sethook([[ + # set a line hook after 3 count hooks + sethook 4 0 ' + getglobal t; + pushvalue -3; append -2 + pushvalue -2; append -2 + ']], "c", 3) +local a = 1 -- counting +a = 1 -- counting +a = 1 -- count hook (set line hook) +a = 1 -- line hook +a = 1 -- line hook +debug.sethook() +t = _G.t +assert(t[1] == "line") +line = t[2] +assert(t[3] == "line" and t[4] == line + 1) +assert(t[5] == "line" and t[6] == line + 2) +assert(t[7] == nil) + + +------------------------------------------------------------------------- +do -- testing errors during GC + local a = {} + for i=1,20 do + a[i] = T.newuserdata(i) -- creates several udata + end + for i=1,20,2 do -- mark half of them to raise errors during GC + debug.setmetatable(a[i], {__gc = function (x) error("error inside gc") end}) + end + for i=2,20,2 do -- mark the other half to count and to create more garbage + debug.setmetatable(a[i], {__gc = function (x) load("A=A+1")() end}) + end + _G.A = 0 + a = 0 + while 1 do + local stat, msg = pcall(collectgarbage) + if stat then + break -- stop when no more errors + else + a = a + 1 + assert(string.find(msg, "__gc")) + end + end + assert(a == 10) -- number of errors + + assert(A == 10) -- number of normal collections +end +------------------------------------------------------------------------- +-- test for userdata vals +do + local a = {}; local lim = 30 + for i=0,lim do a[i] = T.pushuserdata(i) end + for i=0,lim do assert(T.udataval(a[i]) == i) end + for i=0,lim do assert(T.pushuserdata(i) == a[i]) end + for i=0,lim do a[a[i]] = i end + for i=0,lim do a[T.pushuserdata(i)] = i end + assert(type(tostring(a[1])) == "string") +end + + +------------------------------------------------------------------------- +-- testing multiple states +T.closestate(T.newstate()); +L1 = T.newstate() +assert(L1) + +assert(T.doremote(L1, "X='a'; return 'a'") == 'a') + + +assert(#pack(T.doremote(L1, "function f () return 'alo', 3 end; f()")) == 0) + +a, b = T.doremote(L1, "return f()") +assert(a == 'alo' and b == '3') + +T.doremote(L1, "_ERRORMESSAGE = nil") +-- error: `sin' is not defined +a, _, b = T.doremote(L1, "return sin(1)") +assert(a == nil and b == 2) -- 2 == run-time error + +-- error: syntax error +a, b, c = T.doremote(L1, "return a+") +assert(a == nil and c == 3 and type(b) == "string") -- 3 == syntax error + +T.loadlib(L1) +a, b, c = T.doremote(L1, [[ + string = require'string' + a = require'_G'; assert(a == _G and require("_G") == a) + io = require'io'; assert(type(io.read) == "function") + assert(require("io") == io) + a = require'table'; assert(type(a.insert) == "function") + a = require'debug'; assert(type(a.getlocal) == "function") + a = require'math'; assert(type(a.sin) == "function") + return string.sub('okinama', 1, 2) +]]) +assert(a == "ok") + +T.closestate(L1); + + +L1 = T.newstate() +T.loadlib(L1) +T.doremote(L1, "a = {}") +T.testC(L1, [[getglobal "a"; pushstring "x"; pushint 1; + settable -3]]) +assert(T.doremote(L1, "return a.x") == "1") + +T.closestate(L1) + +L1 = nil + +print('+') + +------------------------------------------------------------------------- +-- testing memory limits +------------------------------------------------------------------------- +checkerr("block too big", T.newuserdata, math.maxinteger) +collectgarbage() +T.totalmem(T.totalmem()+5000) -- set low memory limit (+5k) +checkerr("not enough memory", load"local a={}; for i=1,100000 do a[i]=i end") +T.totalmem(0) -- restore high limit + +-- test memory errors; increase memory limit in small steps, so that +-- we get memory errors in different parts of a given task, up to there +-- is enough memory to complete the task without errors +function testamem (s, f) + collectgarbage(); collectgarbage() + local M = T.totalmem() + local oldM = M + local a,b = nil + while 1 do + M = M+7 -- increase memory limit in small steps + T.totalmem(M) + a, b = pcall(f) + T.totalmem(0) -- restore high limit + if a and b then break end -- stop when no more errors + collectgarbage() + if not a and not -- `real' error? + (string.find(b, "memory") or string.find(b, "overflow")) then + error(b, 0) -- propagate it + end + end + print("\nlimit for " .. s .. ": " .. M-oldM) + return b +end + + +-- testing memory errors when creating a new state + +b = testamem("state creation", T.newstate) +T.closestate(b); -- close new state + + +-- testing threads + +-- get main thread from registry (at index LUA_RIDX_MAINTHREAD == 1) +mt = T.testC("rawgeti R 1; return 1") +assert(type(mt) == "thread" and coroutine.running() == mt) + + + +function expand (n,s) + if n==0 then return "" end + local e = string.rep("=", n) + return string.format("T.doonnewstack([%s[ %s;\n collectgarbage(); %s]%s])\n", + e, s, expand(n-1,s), e) +end + +G=0; collectgarbage(); a =collectgarbage("count") +load(expand(20,"G=G+1"))() +assert(G==20); collectgarbage(); -- assert(gcinfo() <= a+1) + +testamem("thread creation", function () + return T.doonnewstack("x=1") == 0 -- try to create thread +end) + + +-- testing memory x compiler + +testamem("loadstring", function () + return load("x=1") -- try to do load a string +end) + + +local testprog = [[ +local function foo () return end +local t = {"x"} +a = "aaa" +for i = 1, #t do a=a..t[i] end +return true +]] + +-- testing memory x dofile +_G.a = nil +local t =os.tmpname() +local f = assert(io.open(t, "w")) +f:write(testprog) +f:close() +testamem("dofile", function () + local a = loadfile(t) + return a and a() +end) +assert(os.remove(t)) +assert(_G.a == "aaax") + + +-- other generic tests + +testamem("string creation", function () + local a, b = string.gsub("alo alo", "(a)", function (x) return x..'b' end) + return (a == 'ablo ablo') +end) + +testamem("dump/undump", function () + local a = load(testprog) + local b = a and string.dump(a) + a = b and load(b) + return a and a() +end) + +local t = os.tmpname() +testamem("file creation", function () + local f = assert(io.open(t, 'w')) + assert (not io.open"nomenaoexistente") + io.close(f); + return not loadfile'nomenaoexistente' +end) +assert(os.remove(t)) + +testamem("table creation", function () + local a, lim = {}, 10 + for i=1,lim do a[i] = i; a[i..'a'] = {} end + return (type(a[lim..'a']) == 'table' and a[lim] == lim) +end) + +testamem("constructors", function () + local a = {10, 20, 30, 40, 50; a=1, b=2, c=3, d=4, e=5} + return (type(a) == 'table' and a.e == 5) +end) + +local a = 1 +close = nil +testamem("closure creation", function () + function close (b,c) + return function (x) return a+b+c+x end + end + return (close(2,3)(4) == 10) +end) + +testamem("coroutines", function () + local a = coroutine.wrap(function () + coroutine.yield(string.rep("a", 10)) + return {} + end) + assert(string.len(a()) == 10) + return a() +end) + +do -- auxiliary buffer + local lim = 100 + local a = {}; for i = 1, lim do a[i] = "01234567890123456789" end + testamem("auxiliary buffer", function () + return (#table.concat(a, ",") == 20*lim + lim - 1) + end) +end + +print'+' + +-- testing some auxlib functions +local function gsub (a, b, c) + a, b = T.testC("gsub 2 3 4; gettop; return 2", a, b, c) + assert(b == 5) + return a +end + +assert(gsub("alo.alo.uhuh.", ".", "//") == "alo//alo//uhuh//") +assert(gsub("alo.alo.uhuh.", "alo", "//") == "//.//.uhuh.") +assert(gsub("", "alo", "//") == "") +assert(gsub("...", ".", "/.") == "/././.") +assert(gsub("...", "...", "") == "") + + +-- testing luaL_newmetatable +local mt_xuxu, res, top = T.testC("newmetatable xuxu; gettop; return 3") +assert(type(mt_xuxu) == "table" and res and top == 3) +local d, res, top = T.testC("newmetatable xuxu; gettop; return 3") +assert(mt_xuxu == d and not res and top == 3) +d, res, top = T.testC("newmetatable xuxu1; gettop; return 3") +assert(mt_xuxu ~= d and res and top == 3) + +x = T.newuserdata(0); +y = T.newuserdata(0); +T.testC("pushstring xuxu; gettable R; setmetatable 2", x) +assert(getmetatable(x) == mt_xuxu) + +-- testing luaL_testudata +-- correct metatable +local res1, res2, top = T.testC([[testudata -1 xuxu + testudata 2 xuxu + gettop + return 3]], x) +assert(res1 and res2 and top == 4) + +-- wrong metatable +res1, res2, top = T.testC([[testudata -1 xuxu1 + testudata 2 xuxu1 + gettop + return 3]], x) +assert(not res1 and not res2 and top == 4) + +-- non-existent type +res1, res2, top = T.testC([[testudata -1 xuxu2 + testudata 2 xuxu2 + gettop + return 3]], x) +assert(not res1 and not res2 and top == 4) + +-- userdata has no metatable +res1, res2, top = T.testC([[testudata -1 xuxu + testudata 2 xuxu + gettop + return 3]], y) +assert(not res1 and not res2 and top == 4) + +-- erase metatables +do + local r = debug.getregistry() + assert(r.xuxu == mt_xuxu and r.xuxu1 == d) + r.xuxu = nil; r.xuxu1 = nil +end + +print'OK' + diff --git a/06/parser-gen/parsers/lua-5.3.4-tests/attrib.lua b/06/parser-gen/parsers/lua-5.3.4-tests/attrib.lua new file mode 100644 index 0000000..993a96c --- /dev/null +++ b/06/parser-gen/parsers/lua-5.3.4-tests/attrib.lua @@ -0,0 +1,470 @@ +-- $Id: attrib.lua,v 1.65 2016/11/07 13:11:28 roberto Exp $ +-- See Copyright Notice in file all.lua + +print "testing require" + +assert(require"string" == string) +assert(require"math" == math) +assert(require"table" == table) +assert(require"io" == io) +assert(require"os" == os) +assert(require"coroutine" == coroutine) + +assert(type(package.path) == "string") +assert(type(package.cpath) == "string") +assert(type(package.loaded) == "table") +assert(type(package.preload) == "table") + +assert(type(package.config) == "string") +print("package config: "..string.gsub(package.config, "\n", "|")) + +do + -- create a path with 'max' templates, + -- each with 1-10 repetitions of '?' + local max = _soft and 100 or 2000 + local t = {} + for i = 1,max do t[i] = string.rep("?", i%10 + 1) end + t[#t + 1] = ";" -- empty template + local path = table.concat(t, ";") + -- use that path in a search + local s, err = package.searchpath("xuxu", path) + -- search fails; check that message has an occurence of + -- '??????????' with ? replaced by xuxu and at least 'max' lines + assert(not s and + string.find(err, string.rep("xuxu", 10)) and + #string.gsub(err, "[^\n]", "") >= max) + -- path with one very long template + local path = string.rep("?", max) + local s, err = package.searchpath("xuxu", path) + assert(not s and string.find(err, string.rep('xuxu', max))) +end + +do + local oldpath = package.path + package.path = {} + local s, err = pcall(require, "no-such-file") + assert(not s and string.find(err, "package.path")) + package.path = oldpath +end + +print('+') + + +-- The next tests for 'require' assume some specific directories and +-- libraries. + +if not _port then --[ + +local dirsep = string.match(package.config, "^([^\n]+)\n") + +-- auxiliary directory with C modules and temporary files +local DIR = "libs" .. dirsep + +-- prepend DIR to a name and correct directory separators +local function D (x) + x = string.gsub(x, "/", dirsep) + return DIR .. x +end + +-- prepend DIR and pospend proper C lib. extension to a name +local function DC (x) + local ext = (dirsep == '\\') and ".dll" or ".so" + return D(x .. ext) +end + + +local function createfiles (files, preextras, posextras) + for n,c in pairs(files) do + io.output(D(n)) + io.write(string.format(preextras, n)) + io.write(c) + io.write(string.format(posextras, n)) + io.close(io.output()) + end +end + +function removefiles (files) + for n in pairs(files) do + os.remove(D(n)) + end +end + +local files = { + ["names.lua"] = "do return {...} end\n", + ["err.lua"] = "B = 15; a = a + 1;", + ["synerr.lua"] = "B =", + ["A.lua"] = "", + ["B.lua"] = "assert(...=='B');require 'A'", + ["A.lc"] = "", + ["A"] = "", + ["L"] = "", + ["XXxX"] = "", + ["C.lua"] = "package.loaded[...] = 25; require'C'", +} + +AA = nil +local extras = [[ +NAME = '%s' +REQUIRED = ... +return AA]] + +createfiles(files, "", extras) + +-- testing explicit "dir" separator in 'searchpath' +assert(package.searchpath("C.lua", D"?", "", "") == D"C.lua") +assert(package.searchpath("C.lua", D"?", ".", ".") == D"C.lua") +assert(package.searchpath("--x-", D"?", "-", "X") == D"XXxX") +assert(package.searchpath("---xX", D"?", "---", "XX") == D"XXxX") +assert(package.searchpath(D"C.lua", "?", dirsep) == D"C.lua") +assert(package.searchpath(".\\C.lua", D"?", "\\") == D"./C.lua") + +local oldpath = package.path + +package.path = string.gsub("D/?.lua;D/?.lc;D/?;D/??x?;D/L", "D/", DIR) + +local try = function (p, n, r) + NAME = nil + local rr = require(p) + assert(NAME == n) + assert(REQUIRED == p) + assert(rr == r) +end + +a = require"names" +assert(a[1] == "names" and a[2] == D"names.lua") + +_G.a = nil +local st, msg = pcall(require, "err") +assert(not st and string.find(msg, "arithmetic") and B == 15) +st, msg = pcall(require, "synerr") +assert(not st and string.find(msg, "error loading module")) + +assert(package.searchpath("C", package.path) == D"C.lua") +assert(require"C" == 25) +assert(require"C" == 25) +AA = nil +try('B', 'B.lua', true) +assert(package.loaded.B) +assert(require"B" == true) +assert(package.loaded.A) +assert(require"C" == 25) +package.loaded.A = nil +try('B', nil, true) -- should not reload package +try('A', 'A.lua', true) +package.loaded.A = nil +os.remove(D'A.lua') +AA = {} +try('A', 'A.lc', AA) -- now must find second option +assert(package.searchpath("A", package.path) == D"A.lc") +assert(require("A") == AA) +AA = false +try('K', 'L', false) -- default option +try('K', 'L', false) -- default option (should reload it) +assert(rawget(_G, "_REQUIREDNAME") == nil) + +AA = "x" +try("X", "XXxX", AA) + + +removefiles(files) + + +-- testing require of sub-packages + +local _G = _G + +package.path = string.gsub("D/?.lua;D/?/init.lua", "D/", DIR) + +files = { + ["P1/init.lua"] = "AA = 10", + ["P1/xuxu.lua"] = "AA = 20", +} + +createfiles(files, "_ENV = {}\n", "\nreturn _ENV\n") +AA = 0 + +local m = assert(require"P1") +assert(AA == 0 and m.AA == 10) +assert(require"P1" == m) +assert(require"P1" == m) + +assert(package.searchpath("P1.xuxu", package.path) == D"P1/xuxu.lua") +m.xuxu = assert(require"P1.xuxu") +assert(AA == 0 and m.xuxu.AA == 20) +assert(require"P1.xuxu" == m.xuxu) +assert(require"P1.xuxu" == m.xuxu) +assert(require"P1" == m and m.AA == 10) + + +removefiles(files) + + +package.path = "" +assert(not pcall(require, "file_does_not_exist")) +package.path = "??\0?" +assert(not pcall(require, "file_does_not_exist1")) + +package.path = oldpath + +-- check 'require' error message +local fname = "file_does_not_exist2" +local m, err = pcall(require, fname) +for t in string.gmatch(package.path..";"..package.cpath, "[^;]+") do + t = string.gsub(t, "?", fname) + assert(string.find(err, t, 1, true)) +end + +do -- testing 'package.searchers' not being a table + local searchers = package.searchers + package.searchers = 3 + local st, msg = pcall(require, 'a') + assert(not st and string.find(msg, "must be a table")) + package.searchers = searchers +end + +local function import(...) + local f = {...} + return function (m) + for i=1, #f do m[f[i]] = _G[f[i]] end + end +end + +-- cannot change environment of a C function +assert(not pcall(module, 'XUXU')) + + + +-- testing require of C libraries + + +local p = "" -- On Mac OS X, redefine this to "_" + +-- check whether loadlib works in this system +local st, err, when = package.loadlib(DC"lib1", "*") +if not st then + local f, err, when = package.loadlib("donotexist", p.."xuxu") + assert(not f and type(err) == "string" and when == "absent") + ;(Message or print)('\n >>> cannot load dynamic library <<<\n') + print(err, when) +else + -- tests for loadlib + local f = assert(package.loadlib(DC"lib1", p.."onefunction")) + local a, b = f(15, 25) + assert(a == 25 and b == 15) + + f = assert(package.loadlib(DC"lib1", p.."anotherfunc")) + assert(f(10, 20) == "10%20\n") + + -- check error messages + local f, err, when = package.loadlib(DC"lib1", p.."xuxu") + assert(not f and type(err) == "string" and when == "init") + f, err, when = package.loadlib("donotexist", p.."xuxu") + assert(not f and type(err) == "string" and when == "open") + + -- symbols from 'lib1' must be visible to other libraries + f = assert(package.loadlib(DC"lib11", p.."luaopen_lib11")) + assert(f() == "exported") + + -- test C modules with prefixes in names + package.cpath = DC"?" + local lib2 = require"lib2-v2" + -- check correct access to global environment and correct + -- parameters + assert(_ENV.x == "lib2-v2" and _ENV.y == DC"lib2-v2") + assert(lib2.id("x") == "x") + + -- test C submodules + local fs = require"lib1.sub" + assert(_ENV.x == "lib1.sub" and _ENV.y == DC"lib1") + assert(fs.id(45) == 45) +end + +_ENV = _G + + +-- testing preload + +do + local p = package + package = {} + p.preload.pl = function (...) + local _ENV = {...} + function xuxu (x) return x+20 end + return _ENV + end + + local pl = require"pl" + assert(require"pl" == pl) + assert(pl.xuxu(10) == 30) + assert(pl[1] == "pl" and pl[2] == nil) + + package = p + assert(type(package.path) == "string") +end + +print('+') + +end --] + +print("testing assignments, logical operators, and constructors") + +local res, res2 = 27 + +a, b = 1, 2+3 +assert(a==1 and b==5) +a={} +function f() return 10, 11, 12 end +a.x, b, a[1] = 1, 2, f() +assert(a.x==1 and b==2 and a[1]==10) +a[f()], b, a[f()+3] = f(), a, 'x' +assert(a[10] == 10 and b == a and a[13] == 'x') + +do + local f = function (n) local x = {}; for i=1,n do x[i]=i end; + return table.unpack(x) end; + local a,b,c + a,b = 0, f(1) + assert(a == 0 and b == 1) + A,b = 0, f(1) + assert(A == 0 and b == 1) + a,b,c = 0,5,f(4) + assert(a==0 and b==5 and c==1) + a,b,c = 0,5,f(0) + assert(a==0 and b==5 and c==nil) +end + +a, b, c, d = 1 and nil, 1 or nil, (1 and (nil or 1)), 6 +assert(not a and b and c and d==6) + +d = 20 +a, b, c, d = f() +assert(a==10 and b==11 and c==12 and d==nil) +a,b = f(), 1, 2, 3, f() +assert(a==10 and b==1) + +assert(ab == true) +assert((10 and 2) == 2) +assert((10 or 2) == 10) +assert((10 or assert(nil)) == 10) +assert(not (nil and assert(nil))) +assert((nil or "alo") == "alo") +assert((nil and 10) == nil) +assert((false and 10) == false) +assert((true or 10) == true) +assert((false or 10) == 10) +assert(false ~= nil) +assert(nil ~= false) +assert(not nil == true) +assert(not not nil == false) +assert(not not 1 == true) +assert(not not a == true) +assert(not not (6 or nil) == true) +assert(not not (nil and 56) == false) +assert(not not (nil and true) == false) +assert(not 10 == false) +assert(not {} == false) +assert(not 0.5 == false) +assert(not "x" == false) + +assert({} ~= {}) +print('+') + +a = {} +a[true] = 20 +a[false] = 10 +assert(a[1<2] == 20 and a[1>2] == 10) + +function f(a) return a end + +local a = {} +for i=3000,-3000,-1 do a[i + 0.0] = i; end +a[10e30] = "alo"; a[true] = 10; a[false] = 20 +assert(a[10e30] == 'alo' and a[not 1] == 20 and a[10<20] == 10) +for i=3000,-3000,-1 do assert(a[i] == i); end +a[print] = assert +a[f] = print +a[a] = a +assert(a[a][a][a][a][print] == assert) +a[print](a[a[f]] == a[print]) +assert(not pcall(function () local a = {}; a[nil] = 10 end)) +assert(not pcall(function () local a = {[nil] = 10} end)) +assert(a[nil] == nil) +a = nil + +a = {10,9,8,7,6,5,4,3,2; [-3]='a', [f]=print, a='a', b='ab'} +a, a.x, a.y = a, a[-3] +assert(a[1]==10 and a[-3]==a.a and a[f]==print and a.x=='a' and not a.y) +a[1], f(a)[2], b, c = {['alo']=assert}, 10, a[1], a[f], 6, 10, 23, f(a), 2 +a[1].alo(a[2]==10 and b==10 and c==print) + + +-- test of large float/integer indices + +-- compute maximum integer where all bits fit in a float +local maxint = math.maxinteger + +while maxint - 1.0 == maxint - 0.0 do -- trim (if needed) to fit in a float + maxint = maxint // 2 +end + +maxintF = maxint + 0.0 -- float version + +assert(math.type(maxintF) == "float" and maxintF >= 2.0^14) + +-- floats and integers must index the same places +a[maxintF] = 10; a[maxintF - 1.0] = 11; +a[-maxintF] = 12; a[-maxintF + 1.0] = 13; + +assert(a[maxint] == 10 and a[maxint - 1] == 11 and + a[-maxint] == 12 and a[-maxint + 1] == 13) + +a[maxint] = 20 +a[-maxint] = 22 + +assert(a[maxintF] == 20 and a[maxintF - 1.0] == 11 and + a[-maxintF] == 22 and a[-maxintF + 1.0] == 13) + +a = nil + + +-- test conflicts in multiple assignment +do + local a,i,j,b + a = {'a', 'b'}; i=1; j=2; b=a + i, a[i], a, j, a[j], a[i+j] = j, i, i, b, j, i + assert(i == 2 and b[1] == 1 and a == 1 and j == b and b[2] == 2 and + b[3] == 1) +end + +-- repeat test with upvalues +do + local a,i,j,b + a = {'a', 'b'}; i=1; j=2; b=a + local function foo () + i, a[i], a, j, a[j], a[i+j] = j, i, i, b, j, i + end + foo() + assert(i == 2 and b[1] == 1 and a == 1 and j == b and b[2] == 2 and + b[3] == 1) + local t = {} + (function (a) t[a], a = 10, 20 end)(1); + assert(t[1] == 10) +end + +-- bug in 5.2 beta +local function foo () + local a + return function () + local b + a, b = 3, 14 -- local and upvalue have same index + return a, b + end +end + +local a, b = foo()() +assert(a == 3 and b == 14) + +print('OK') + +return res + diff --git a/06/parser-gen/parsers/lua-5.3.4-tests/big.lua b/06/parser-gen/parsers/lua-5.3.4-tests/big.lua new file mode 100644 index 0000000..1a1fa78 --- /dev/null +++ b/06/parser-gen/parsers/lua-5.3.4-tests/big.lua @@ -0,0 +1,82 @@ +-- $Id: big.lua,v 1.32 2016/11/07 13:11:28 roberto Exp $ +-- See Copyright Notice in file all.lua + +if _soft then + return 'a' +end + +print "testing large tables" + +local debug = require"debug" + +local lim = 2^18 + 1000 +local prog = { "local y = {0" } +for i = 1, lim do prog[#prog + 1] = i end +prog[#prog + 1] = "}\n" +prog[#prog + 1] = "X = y\n" +prog[#prog + 1] = ("assert(X[%d] == %d)"):format(lim - 1, lim - 2) +prog[#prog + 1] = "return 0" +prog = table.concat(prog, ";") + +local env = {string = string, assert = assert} +local f = assert(load(prog, nil, nil, env)) + +f() +assert(env.X[lim] == lim - 1 and env.X[lim + 1] == lim) +for k in pairs(env) do env[k] = nil end + +-- yields during accesses larger than K (in RK) +setmetatable(env, { + __index = function (t, n) coroutine.yield('g'); return _G[n] end, + __newindex = function (t, n, v) coroutine.yield('s'); _G[n] = v end, +}) + +X = nil +co = coroutine.wrap(f) +assert(co() == 's') +assert(co() == 'g') +assert(co() == 'g') +assert(co() == 0) + +assert(X[lim] == lim - 1 and X[lim + 1] == lim) + +-- errors in accesses larger than K (in RK) +getmetatable(env).__index = function () end +getmetatable(env).__newindex = function () end +local e, m = pcall(f) +assert(not e and m:find("global 'X'")) + +-- errors in metamethods +getmetatable(env).__newindex = function () error("hi") end +local e, m = xpcall(f, debug.traceback) +assert(not e and m:find("'__newindex'")) + +f, X = nil + +coroutine.yield'b' + +if 2^32 == 0 then -- (small integers) { + +print "testing string length overflow" + +local repstrings = 192 -- number of strings to be concatenated +local ssize = math.ceil(2.0^32 / repstrings) + 1 -- size of each string + +assert(repstrings * ssize > 2.0^32) -- it should be larger than maximum size + +local longs = string.rep("\0", ssize) -- create one long string + +-- create function to concatentate 'repstrings' copies of its argument +local rep = assert(load( + "local a = ...; return " .. string.rep("a", repstrings, ".."))) + +local a, b = pcall(rep, longs) -- call that function + +-- it should fail without creating string (result would be too large) +assert(not a and string.find(b, "overflow")) + +end -- } + +print'OK' + +return 'a' diff --git a/06/parser-gen/parsers/lua-5.3.4-tests/bitwise.lua b/06/parser-gen/parsers/lua-5.3.4-tests/bitwise.lua new file mode 100644 index 0000000..a1d6ff4 --- /dev/null +++ b/06/parser-gen/parsers/lua-5.3.4-tests/bitwise.lua @@ -0,0 +1,328 @@ +-- $Id: bitwise.lua,v 1.26 2016/11/07 13:11:28 roberto Exp $ +-- See Copyright Notice in file all.lua + +print("testing bitwise operations") + +local numbits = string.packsize('j') * 8 + +assert(~0 == -1) + +assert((1 << (numbits - 1)) == math.mininteger) + +-- basic tests for bitwise operators; +-- use variables to avoid constant folding +local a, b, c, d +a = 0xFFFFFFFFFFFFFFFF +assert(a == -1 and a & -1 == a and a & 35 == 35) +a = 0xF0F0F0F0F0F0F0F0 +assert(a | -1 == -1) +assert(a ~ a == 0 and a ~ 0 == a and a ~ ~a == -1) +assert(a >> 4 == ~a) +a = 0xF0; b = 0xCC; c = 0xAA; d = 0xFD +assert(a | b ~ c & d == 0xF4) + +a = 0xF0.0; b = 0xCC.0; c = "0xAA.0"; d = "0xFD.0" +assert(a | b ~ c & d == 0xF4) + +a = 0xF0000000; b = 0xCC000000; +c = 0xAA000000; d = 0xFD000000 +assert(a | b ~ c & d == 0xF4000000) +assert(~~a == a and ~a == -1 ~ a and -d == ~d + 1) + +a = a << 32 +b = b << 32 +c = c << 32 +d = d << 32 +assert(a | b ~ c & d == 0xF4000000 << 32) +assert(~~a == a and ~a == -1 ~ a and -d == ~d + 1) + +assert(-1 >> 1 == (1 << (numbits - 1)) - 1 and 1 << 31 == 0x80000000) +assert(-1 >> (numbits - 1) == 1) +assert(-1 >> numbits == 0 and + -1 >> -numbits == 0 and + -1 << numbits == 0 and + -1 << -numbits == 0) + +assert((2^30 - 1) << 2^30 == 0) +assert((2^30 - 1) >> 2^30 == 0) + +assert(1 >> -3 == 1 << 3 and 1000 >> 5 == 1000 << -5) + + +-- coercion from strings to integers +assert("0xffffffffffffffff" | 0 == -1) +assert("0xfffffffffffffffe" & "-1" == -2) +assert(" \t-0xfffffffffffffffe\n\t" & "-1" == 2) +assert(" \n -45 \t " >> " -2 " == -45 * 4) + +-- out of range number +assert(not pcall(function () return "0xffffffffffffffff.0" | 0 end)) + +-- embedded zeros +assert(not pcall(function () return "0xffffffffffffffff\0" | 0 end)) + +print'+' + + +package.preload.bit32 = function () --{ + +-- no built-in 'bit32' library: implement it using bitwise operators + +local bit = {} + +function bit.bnot (a) + return ~a & 0xFFFFFFFF +end + + +-- +-- in all vararg functions, avoid creating 'arg' table when there are +-- only 2 (or less) parameters, as 2 parameters is the common case +-- + +function bit.band (x, y, z, ...) + if not z then + + else + local arg = {...} + local res = x & y & z + for i = 1, #arg do res = res & arg[i] end + return res & 0xFFFFFFFF + end +end + +function bit.bor (x, y, z, ...) + if not z then + return ((x or 0) | (y or 0)) & 0xFFFFFFFF + else + local arg = {...} + local res = x | y | z + for i = 1, #arg do res = res | arg[i] end + return res & 0xFFFFFFFF + end +end + +function bit.bxor (x, y, z, ...) + if not z then + return ((x or 0) ~ (y or 0)) & 0xFFFFFFFF + else + local arg = {...} + local res = x ~ y ~ z + for i = 1, #arg do res = res ~ arg[i] end + return res & 0xFFFFFFFF + end +end + +function bit.btest (...) + return bit.band(...) ~= 0 +end + +function bit.lshift (a, b) + return ((a & 0xFFFFFFFF) << b) & 0xFFFFFFFF +end + +function bit.rshift (a, b) + return ((a & 0xFFFFFFFF) >> b) & 0xFFFFFFFF +end + +function bit.arshift (a, b) + a = a & 0xFFFFFFFF + if b <= 0 or (a & 0x80000000) == 0 then + return (a >> b) & 0xFFFFFFFF + else + return ((a >> b) | ~(0xFFFFFFFF >> b)) & 0xFFFFFFFF + end +end + +function bit.lrotate (a ,b) + b = b & 31 + a = a & 0xFFFFFFFF + a = (a << b) | (a >> (32 - b)) + return a & 0xFFFFFFFF +end + +function bit.rrotate (a, b) + return bit.lrotate(a, -b) +end + +local function checkfield (f, w) + w = w or 1 + assert(f >= 0, "field cannot be negative") + assert(w > 0, "width must be positive") + assert(f + w <= 32, "trying to access non-existent bits") + return f, ~(-1 << w) +end + +function bit.extract (a, f, w) + local f, mask = checkfield(f, w) + return (a >> f) & mask +end + +function bit.replace (a, v, f, w) + local f, mask = checkfield(f, w) + v = v & mask + a = (a & ~(mask << f)) | (v << f) + return a & 0xFFFFFFFF +end + +return bit + +end --} + + +print("testing bitwise library") + +local bit32 = require'bit32' + +assert(bit32.band() == bit32.bnot(0)) +assert(bit32.btest() == true) +assert(bit32.bor() == 0) +assert(bit32.bxor() == 0) + +assert(bit32.band() == bit32.band(0xffffffff)) +assert(bit32.band(1,2) == 0) + + +-- out-of-range numbers +assert(bit32.band(-1) == 0xffffffff) +assert(bit32.band((1 << 33) - 1) == 0xffffffff) +assert(bit32.band(-(1 << 33) - 1) == 0xffffffff) +assert(bit32.band((1 << 33) + 1) == 1) +assert(bit32.band(-(1 << 33) + 1) == 1) +assert(bit32.band(-(1 << 40)) == 0) +assert(bit32.band(1 << 40) == 0) +assert(bit32.band(-(1 << 40) - 2) == 0xfffffffe) +assert(bit32.band((1 << 40) - 4) == 0xfffffffc) + +assert(bit32.lrotate(0, -1) == 0) +assert(bit32.lrotate(0, 7) == 0) +assert(bit32.lrotate(0x12345678, 0) == 0x12345678) +assert(bit32.lrotate(0x12345678, 32) == 0x12345678) +assert(bit32.lrotate(0x12345678, 4) == 0x23456781) +assert(bit32.rrotate(0x12345678, -4) == 0x23456781) +assert(bit32.lrotate(0x12345678, -8) == 0x78123456) +assert(bit32.rrotate(0x12345678, 8) == 0x78123456) +assert(bit32.lrotate(0xaaaaaaaa, 2) == 0xaaaaaaaa) +assert(bit32.lrotate(0xaaaaaaaa, -2) == 0xaaaaaaaa) +for i = -50, 50 do + assert(bit32.lrotate(0x89abcdef, i) == bit32.lrotate(0x89abcdef, i%32)) +end + +assert(bit32.lshift(0x12345678, 4) == 0x23456780) +assert(bit32.lshift(0x12345678, 8) == 0x34567800) +assert(bit32.lshift(0x12345678, -4) == 0x01234567) +assert(bit32.lshift(0x12345678, -8) == 0x00123456) +assert(bit32.lshift(0x12345678, 32) == 0) +assert(bit32.lshift(0x12345678, -32) == 0) +assert(bit32.rshift(0x12345678, 4) == 0x01234567) +assert(bit32.rshift(0x12345678, 8) == 0x00123456) +assert(bit32.rshift(0x12345678, 32) == 0) +assert(bit32.rshift(0x12345678, -32) == 0) +assert(bit32.arshift(0x12345678, 0) == 0x12345678) +assert(bit32.arshift(0x12345678, 1) == 0x12345678 // 2) +assert(bit32.arshift(0x12345678, -1) == 0x12345678 * 2) +assert(bit32.arshift(-1, 1) == 0xffffffff) +assert(bit32.arshift(-1, 24) == 0xffffffff) +assert(bit32.arshift(-1, 32) == 0xffffffff) +assert(bit32.arshift(-1, -1) == bit32.band(-1 * 2, 0xffffffff)) + +assert(0x12345678 << 4 == 0x123456780) +assert(0x12345678 << 8 == 0x1234567800) +assert(0x12345678 << -4 == 0x01234567) +assert(0x12345678 << -8 == 0x00123456) +assert(0x12345678 << 32 == 0x1234567800000000) +assert(0x12345678 << -32 == 0) +assert(0x12345678 >> 4 == 0x01234567) +assert(0x12345678 >> 8 == 0x00123456) +assert(0x12345678 >> 32 == 0) +assert(0x12345678 >> -32 == 0x1234567800000000) + +print("+") +-- some special cases +local c = {0, 1, 2, 3, 10, 0x80000000, 0xaaaaaaaa, 0x55555555, + 0xffffffff, 0x7fffffff} + +for _, b in pairs(c) do + assert(bit32.band(b) == b) + assert(bit32.band(b, b) == b) + assert(bit32.band(b, b, b, b) == b) + assert(bit32.btest(b, b) == (b ~= 0)) + assert(bit32.band(b, b, b) == b) + assert(bit32.band(b, b, b, ~b) == 0) + assert(bit32.btest(b, b, b) == (b ~= 0)) + assert(bit32.band(b, bit32.bnot(b)) == 0) + assert(bit32.bor(b, bit32.bnot(b)) == bit32.bnot(0)) + assert(bit32.bor(b) == b) + assert(bit32.bor(b, b) == b) + assert(bit32.bor(b, b, b) == b) + assert(bit32.bor(b, b, 0, ~b) == 0xffffffff) + assert(bit32.bxor(b) == b) + assert(bit32.bxor(b, b) == 0) + assert(bit32.bxor(b, b, b) == b) + assert(bit32.bxor(b, b, b, b) == 0) + assert(bit32.bxor(b, 0) == b) + assert(bit32.bnot(b) ~= b) + assert(bit32.bnot(bit32.bnot(b)) == b) + assert(bit32.bnot(b) == (1 << 32) - 1 - b) + assert(bit32.lrotate(b, 32) == b) + assert(bit32.rrotate(b, 32) == b) + assert(bit32.lshift(bit32.lshift(b, -4), 4) == bit32.band(b, bit32.bnot(0xf))) + assert(bit32.rshift(bit32.rshift(b, 4), -4) == bit32.band(b, bit32.bnot(0xf))) +end + +-- for this test, use at most 24 bits (mantissa of a single float) +c = {0, 1, 2, 3, 10, 0x800000, 0xaaaaaa, 0x555555, 0xffffff, 0x7fffff} +for _, b in pairs(c) do + for i = -40, 40 do + local x = bit32.lshift(b, i) + local y = math.floor(math.fmod(b * 2.0^i, 2.0^32)) + assert(math.fmod(x - y, 2.0^32) == 0) + end +end + +assert(not pcall(bit32.band, {})) +assert(not pcall(bit32.bnot, "a")) +assert(not pcall(bit32.lshift, 45)) +assert(not pcall(bit32.lshift, 45, print)) +assert(not pcall(bit32.rshift, 45, print)) + +print("+") + + +-- testing extract/replace + +assert(bit32.extract(0x12345678, 0, 4) == 8) +assert(bit32.extract(0x12345678, 4, 4) == 7) +assert(bit32.extract(0xa0001111, 28, 4) == 0xa) +assert(bit32.extract(0xa0001111, 31, 1) == 1) +assert(bit32.extract(0x50000111, 31, 1) == 0) +assert(bit32.extract(0xf2345679, 0, 32) == 0xf2345679) + +assert(not pcall(bit32.extract, 0, -1)) +assert(not pcall(bit32.extract, 0, 32)) +assert(not pcall(bit32.extract, 0, 0, 33)) +assert(not pcall(bit32.extract, 0, 31, 2)) + +assert(bit32.replace(0x12345678, 5, 28, 4) == 0x52345678) +assert(bit32.replace(0x12345678, 0x87654321, 0, 32) == 0x87654321) +assert(bit32.replace(0, 1, 2) == 2^2) +assert(bit32.replace(0, -1, 4) == 2^4) +assert(bit32.replace(-1, 0, 31) == (1 << 31) - 1) +assert(bit32.replace(-1, 0, 1, 2) == (1 << 32) - 7) + + +-- testing conversion of floats + +assert(bit32.bor(3.0) == 3) +assert(bit32.bor(-4.0) == 0xfffffffc) + +-- large floats and large-enough integers? +if 2.0^50 < 2.0^50 + 1.0 and 2.0^50 < (-1 >> 1) then + assert(bit32.bor(2.0^32 - 5.0) == 0xfffffffb) + assert(bit32.bor(-2.0^32 - 6.0) == 0xfffffffa) + assert(bit32.bor(2.0^48 - 5.0) == 0xfffffffb) + assert(bit32.bor(-2.0^48 - 6.0) == 0xfffffffa) +end + +print'OK' + diff --git a/06/parser-gen/parsers/lua-5.3.4-tests/calls.lua b/06/parser-gen/parsers/lua-5.3.4-tests/calls.lua new file mode 100644 index 0000000..6d6fb7b --- /dev/null +++ b/06/parser-gen/parsers/lua-5.3.4-tests/calls.lua @@ -0,0 +1,401 @@ +-- $Id: calls.lua,v 1.60 2016/11/07 13:11:28 roberto Exp $ +-- See Copyright Notice in file all.lua + +print("testing functions and calls") + +local debug = require "debug" + +-- get the opportunity to test 'type' too ;) + +assert(type(1<2) == 'boolean') +assert(type(true) == 'boolean' and type(false) == 'boolean') +assert(type(nil) == 'nil' + and type(-3) == 'number' + and type'x' == 'string' + and type{} == 'table' + and type(type) == 'function') + +assert(type(assert) == type(print)) +function f (x) return a:x (x) end +assert(type(f) == 'function') +assert(not pcall(type)) + + +do -- test error in 'print' too... + local tostring = _ENV.tostring + + _ENV.tostring = nil + local st, msg = pcall(print, 1) + assert(st == false and string.find(msg, "attempt to call a nil value")) + + _ENV.tostring = function () return {} end + local st, msg = pcall(print, 1) + assert(st == false and string.find(msg, "must return a string")) + + _ENV.tostring = tostring +end + + +-- testing local-function recursion +fact = false +do + local res = 1 + local function fact (n) + if n==0 then return res + else return n*fact(n-1) + end + end + assert(fact(5) == 120) +end +assert(fact == false) + +-- testing declarations +a = {i = 10} +self = 20 +function a:x (x) return x+self.i end +function a.y (x) return x+self end + +assert(a:x(1)+10 == a.y(1)) + +a.t = {i=-100} +a["t"].x = function (self, a,b) return self.i+a+b end + +assert(a.t:x(2,3) == -95) + +do + local a = {x=0} + function a:add (x) self.x, a.y = self.x+x, 20; return self end + assert(a:add(10):add(20):add(30).x == 60 and a.y == 20) +end + +local a = {b={c={}}} + +function a.b.c.f1 (x) return x+1 end +function a.b.c:f2 (x,y) self[x] = y end +assert(a.b.c.f1(4) == 5) +a.b.c:f2('k', 12); assert(a.b.c.k == 12) + +print('+') + +t = nil -- 'declare' t +function f(a,b,c) local d = 'a'; t={a,b,c,d} end + +f( -- this line change must be valid + 1,2) +assert(t[1] == 1 and t[2] == 2 and t[3] == nil and t[4] == 'a') +f(1,2, -- this one too + 3,4) +assert(t[1] == 1 and t[2] == 2 and t[3] == 3 and t[4] == 'a') + +function fat(x) + if x <= 1 then return 1 + else return x*load("return fat(" .. x-1 .. ")", "")() + end +end + +assert(load "load 'assert(fat(6)==720)' () ")() +a = load('return fat(5), 3') +a,b = a() +assert(a == 120 and b == 3) +print('+') + +function err_on_n (n) + if n==0 then error(); exit(1); + else err_on_n (n-1); exit(1); + end +end + +do + function dummy (n) + if n > 0 then + assert(not pcall(err_on_n, n)) + dummy(n-1) + end + end +end + +dummy(10) + +function deep (n) + if n>0 then deep(n-1) end +end +deep(10) +deep(200) + +-- testing tail call +function deep (n) if n>0 then return deep(n-1) else return 101 end end +assert(deep(30000) == 101) +a = {} +function a:deep (n) if n>0 then return self:deep(n-1) else return 101 end end +assert(a:deep(30000) == 101) + +print('+') + + +a = nil +(function (x) a=x end)(23) +assert(a == 23 and (function (x) return x*2 end)(20) == 40) + + +-- testing closures + +-- fixed-point operator +Z = function (le) + local function a (f) + return le(function (x) return f(f)(x) end) + end + return a(a) + end + + +-- non-recursive factorial + +F = function (f) + return function (n) + if n == 0 then return 1 + else return n*f(n-1) end + end + end + +fat = Z(F) + +assert(fat(0) == 1 and fat(4) == 24 and Z(F)(5)==5*Z(F)(4)) + +local function g (z) + local function f (a,b,c,d) + return function (x,y) return a+b+c+d+a+x+y+z end + end + return f(z,z+1,z+2,z+3) +end + +f = g(10) +assert(f(9, 16) == 10+11+12+13+10+9+16+10) + +Z, F, f = nil +print('+') + +-- testing multiple returns + +function unlpack (t, i) + i = i or 1 + if (i <= #t) then + return t[i], unlpack(t, i+1) + end +end + +function equaltab (t1, t2) + assert(#t1 == #t2) + for i = 1, #t1 do + assert(t1[i] == t2[i]) + end +end + +local pack = function (...) return (table.pack(...)) end + +function f() return 1,2,30,4 end +function ret2 (a,b) return a,b end + +local a,b,c,d = unlpack{1,2,3} +assert(a==1 and b==2 and c==3 and d==nil) +a = {1,2,3,4,false,10,'alo',false,assert} +equaltab(pack(unlpack(a)), a) +equaltab(pack(unlpack(a), -1), {1,-1}) +a,b,c,d = ret2(f()), ret2(f()) +assert(a==1 and b==1 and c==2 and d==nil) +a,b,c,d = unlpack(pack(ret2(f()), ret2(f()))) +assert(a==1 and b==1 and c==2 and d==nil) +a,b,c,d = unlpack(pack(ret2(f()), (ret2(f())))) +assert(a==1 and b==1 and c==nil and d==nil) + +a = ret2{ unlpack{1,2,3}, unlpack{3,2,1}, unlpack{"a", "b"}} +assert(a[1] == 1 and a[2] == 3 and a[3] == "a" and a[4] == "b") + + +-- testing calls with 'incorrect' arguments +rawget({}, "x", 1) +rawset({}, "x", 1, 2) +assert(math.sin(1,2) == math.sin(1)) +table.sort({10,9,8,4,19,23,0,0}, function (a,b) return a 10 or a[i]() ~= x +assert(i == 11 and a[1]() == 1 and a[3]() == 3 and i == 4) + + +-- testing closures created in 'then' and 'else' parts of 'if's +a = {} +for i = 1, 10 do + if i % 3 == 0 then + local y = 0 + a[i] = function (x) local t = y; y = x; return t end + elseif i % 3 == 1 then + goto L1 + error'not here' + ::L1:: + local y = 1 + a[i] = function (x) local t = y; y = x; return t end + elseif i % 3 == 2 then + local t + goto l4 + ::l4a:: a[i] = t; goto l4b + error("should never be here!") + ::l4:: + local y = 2 + t = function (x) local t = y; y = x; return t end + goto l4a + error("should never be here!") + ::l4b:: + end +end + +for i = 1, 10 do + assert(a[i](i * 10) == i % 3 and a[i]() == i * 10) +end + +print'+' + + +-- test for correctly closing upvalues in tail calls of vararg functions +local function t () + local function c(a,b) assert(a=="test" and b=="OK") end + local function v(f, ...) c("test", f() ~= 1 and "FAILED" or "OK") end + local x = 1 + return v(function() return x end) +end +t() + + +-- test for debug manipulation of upvalues +local debug = require'debug' + +do + local a , b, c = 3, 5, 7 + foo1 = function () return a+b end; + foo2 = function () return b+a end; + do + local a = 10 + foo3 = function () return a+b end; + end +end + +assert(debug.upvalueid(foo1, 1)) +assert(debug.upvalueid(foo1, 2)) +assert(not pcall(debug.upvalueid, foo1, 3)) +assert(debug.upvalueid(foo1, 1) == debug.upvalueid(foo2, 2)) +assert(debug.upvalueid(foo1, 2) == debug.upvalueid(foo2, 1)) +assert(debug.upvalueid(foo3, 1)) +assert(debug.upvalueid(foo1, 1) ~= debug.upvalueid(foo3, 1)) +assert(debug.upvalueid(foo1, 2) == debug.upvalueid(foo3, 2)) + +assert(debug.upvalueid(string.gmatch("x", "x"), 1) ~= nil) + +assert(foo1() == 3 + 5 and foo2() == 5 + 3) +debug.upvaluejoin(foo1, 2, foo2, 2) +assert(foo1() == 3 + 3 and foo2() == 5 + 3) +assert(foo3() == 10 + 5) +debug.upvaluejoin(foo3, 2, foo2, 1) +assert(foo3() == 10 + 5) +debug.upvaluejoin(foo3, 2, foo2, 2) +assert(foo3() == 10 + 3) + +assert(not pcall(debug.upvaluejoin, foo1, 3, foo2, 1)) +assert(not pcall(debug.upvaluejoin, foo1, 1, foo2, 3)) +assert(not pcall(debug.upvaluejoin, foo1, 0, foo2, 1)) +assert(not pcall(debug.upvaluejoin, print, 1, foo2, 1)) +assert(not pcall(debug.upvaluejoin, {}, 1, foo2, 1)) +assert(not pcall(debug.upvaluejoin, foo1, 1, print, 1)) + +print'OK' diff --git a/06/parser-gen/parsers/lua-5.3.4-tests/code.lua b/06/parser-gen/parsers/lua-5.3.4-tests/code.lua new file mode 100644 index 0000000..0b9d142 --- /dev/null +++ b/06/parser-gen/parsers/lua-5.3.4-tests/code.lua @@ -0,0 +1,239 @@ +-- $Id: code.lua,v 1.42 2016/11/07 13:04:32 roberto Exp $ +-- See Copyright Notice in file all.lua + +if T==nil then + (Message or print)('\n >>> testC not active: skipping opcode tests <<<\n') + return +end +print "testing code generation and optimizations" + + +-- this code gave an error for the code checker +do + local function f (a) + for k,v,w in a do end + end +end + + +-- testing reuse in constant table +local function checkKlist (func, list) + local k = T.listk(func) + assert(#k == #list) + for i = 1, #k do + assert(k[i] == list[i] and math.type(k[i]) == math.type(list[i])) + end +end + +local function foo () + local a + a = 3; + a = 0; a = 0.0; a = -7 + 7 + a = 3.78/4; a = 3.78/4 + a = -3.78/4; a = 3.78/4; a = -3.78/4 + a = -3.79/4; a = 0.0; a = -0; + a = 3; a = 3.0; a = 3; a = 3.0 +end + +checkKlist(foo, {3, 0, 0.0, 3.78/4, -3.78/4, -3.79/4, 3.0}) + + +-- testing opcodes + +function check (f, ...) + local arg = {...} + local c = T.listcode(f) + for i=1, #arg do + -- print(arg[i], c[i]) + assert(string.find(c[i], '- '..arg[i]..' *%d')) + end + assert(c[#arg+2] == nil) +end + + +function checkequal (a, b) + a = T.listcode(a) + b = T.listcode(b) + for i = 1, #a do + a[i] = string.gsub(a[i], '%b()', '') -- remove line number + b[i] = string.gsub(b[i], '%b()', '') -- remove line number + assert(a[i] == b[i]) + end +end + + +-- some basic instructions +check(function () + (function () end){f()} +end, 'CLOSURE', 'NEWTABLE', 'GETTABUP', 'CALL', 'SETLIST', 'CALL', 'RETURN') + + +-- sequence of LOADNILs +check(function () + local a,b,c + local d; local e; + local f,g,h; + d = nil; d=nil; b=nil; a=nil; c=nil; +end, 'LOADNIL', 'RETURN') + +check(function () + local a,b,c,d = 1,1,1,1 + d=nil;c=nil;b=nil;a=nil +end, 'LOADK', 'LOADK', 'LOADK', 'LOADK', 'LOADNIL', 'RETURN') + +do + local a,b,c,d = 1,1,1,1 + d=nil;c=nil;b=nil;a=nil + assert(a == nil and b == nil and c == nil and d == nil) +end + + +-- single return +check (function (a,b,c) return a end, 'RETURN') + + +-- infinite loops +check(function () while true do local a = -1 end end, +'LOADK', 'JMP', 'RETURN') + +check(function () while 1 do local a = -1 end end, +'LOADK', 'JMP', 'RETURN') + +check(function () repeat local x = 1 until true end, +'LOADK', 'RETURN') + + +-- concat optimization +check(function (a,b,c,d) return a..b..c..d end, + 'MOVE', 'MOVE', 'MOVE', 'MOVE', 'CONCAT', 'RETURN') + +-- not +check(function () return not not nil end, 'LOADBOOL', 'RETURN') +check(function () return not not false end, 'LOADBOOL', 'RETURN') +check(function () return not not true end, 'LOADBOOL', 'RETURN') +check(function () return not not 1 end, 'LOADBOOL', 'RETURN') + +-- direct access to locals +check(function () + local a,b,c,d + a = b*2 + c[2], a[b] = -((a + d/2 - a[b]) ^ a.x), b +end, + 'LOADNIL', + 'MUL', + 'DIV', 'ADD', 'GETTABLE', 'SUB', 'GETTABLE', 'POW', + 'UNM', 'SETTABLE', 'SETTABLE', 'RETURN') + + +-- direct access to constants +check(function () + local a,b + a.x = 3.2 + a.x = b + a[b] = 'x' +end, + 'LOADNIL', 'SETTABLE', 'SETTABLE', 'SETTABLE', 'RETURN') + +check(function () + local a,b + a = 1 - a + b = 1/a + b = 5-4 +end, + 'LOADNIL', 'SUB', 'DIV', 'LOADK', 'RETURN') + +check(function () + local a,b + a[true] = false +end, + 'LOADNIL', 'SETTABLE', 'RETURN') + + +-- constant folding +local function checkK (func, val) + check(func, 'LOADK', 'RETURN') + local k = T.listk(func) + assert(#k == 1 and k[1] == val and math.type(k[1]) == math.type(val)) + assert(func() == val) +end +checkK(function () return 0.0 end, 0.0) +checkK(function () return 0 end, 0) +checkK(function () return -0//1 end, 0) +checkK(function () return 3^-1 end, 1/3) +checkK(function () return (1 + 1)^(50 + 50) end, 2^100) +checkK(function () return (-2)^(31 - 2) end, -0x20000000 + 0.0) +checkK(function () return (-3^0 + 5) // 3.0 end, 1.0) +checkK(function () return -3 % 5 end, 2) +checkK(function () return -((2.0^8 + -(-1)) % 8)/2 * 4 - 3 end, -5.0) +checkK(function () return -((2^8 + -(-1)) % 8)//2 * 4 - 3 end, -7.0) +checkK(function () return 0xF0.0 | 0xCC.0 ~ 0xAA & 0xFD end, 0xF4) +checkK(function () return ~(~0xFF0 | 0xFF0) end, 0) +checkK(function () return ~~-100024.0 end, -100024) +checkK(function () return ((100 << 6) << -4) >> 2 end, 100) + + +-- no foldings +check(function () return -0.0 end, 'LOADK', 'UNM', 'RETURN') +check(function () return 3/0 end, 'DIV', 'RETURN') +check(function () return 0%0 end, 'MOD', 'RETURN') +check(function () return -4//0 end, 'IDIV', 'RETURN') + +-- bug in constant folding for 5.1 +check(function () return -nil end, 'LOADNIL', 'UNM', 'RETURN') + + +check(function () + local a,b,c + b[c], a = c, b + b[a], a = c, b + a, b = c, a + a = a +end, + 'LOADNIL', + 'MOVE', 'MOVE', 'SETTABLE', + 'MOVE', 'MOVE', 'MOVE', 'SETTABLE', + 'MOVE', 'MOVE', 'MOVE', + -- no code for a = a + 'RETURN') + + +-- x == nil , x ~= nil +checkequal(function () if (a==nil) then a=1 end; if a~=nil then a=1 end end, + function () if (a==9) then a=1 end; if a~=9 then a=1 end end) + +check(function () if a==nil then a='a' end end, +'GETTABUP', 'EQ', 'JMP', 'SETTABUP', 'RETURN') + +-- de morgan +checkequal(function () local a; if not (a or b) then b=a end end, + function () local a; if (not a and not b) then b=a end end) + +checkequal(function (l) local a; return 0 <= a and a <= l end, + function (l) local a; return not (not(a >= 0) or not(a <= l)) end) + + +-- if-goto optimizations +check(function (a, b, c, d, e) + if a == b then goto l1 + elseif a == c then goto l2 + elseif a == d then goto l2 + else if a == e then goto l3 + else goto l3 + end + end + ::l1:: ::l2:: ::l3:: ::l4:: +end, 'EQ', 'JMP', 'EQ', 'JMP', 'EQ', 'JMP', 'EQ', 'JMP', 'JMP', 'RETURN') + +checkequal( +function (a) while a < 10 do a = a + 1 end end, +function (a) ::L2:: if not(a < 10) then goto L1 end; a = a + 1; + goto L2; ::L1:: end +) + +checkequal( +function (a) while a < 10 do a = a + 1 end end, +function (a) while true do if not(a < 10) then break end; a = a + 1; end end +) + +print 'OK' + diff --git a/06/parser-gen/parsers/lua-5.3.4-tests/constructs.lua b/06/parser-gen/parsers/lua-5.3.4-tests/constructs.lua new file mode 100644 index 0000000..cebd257 --- /dev/null +++ b/06/parser-gen/parsers/lua-5.3.4-tests/constructs.lua @@ -0,0 +1,313 @@ +-- $Id: constructs.lua,v 1.41 2016/11/07 13:11:28 roberto Exp $ +-- See Copyright Notice in file all.lua + +;;print "testing syntax";; + +local debug = require "debug" + + +local function checkload (s, msg) + assert(string.find(select(2, load(s)), msg)) +end + +-- testing semicollons +do ;;; end +; do ; a = 3; assert(a == 3) end; +; + + +-- invalid operations should not raise errors when not executed +if false then a = 3 // 0; a = 0 % 0 end + + +-- testing priorities + +assert(2^3^2 == 2^(3^2)); +assert(2^3*4 == (2^3)*4); +assert(2.0^-2 == 1/4 and -2^- -2 == - - -4); +assert(not nil and 2 and not(2>3 or 3<2)); +assert(-3-1-5 == 0+0-9); +assert(-2^2 == -4 and (-2)^2 == 4 and 2*2-3-1 == 0); +assert(-3%5 == 2 and -3+5 == 2) +assert(2*1+3/3 == 3 and 1+2 .. 3*1 == "33"); +assert(not(2+1 > 3*1) and "a".."b" > "a"); + +assert("7" .. 3 << 1 == 146) +assert(10 >> 1 .. "9" == 0) +assert(10 | 1 .. "9" == 27) + +assert(0xF0 | 0xCC ~ 0xAA & 0xFD == 0xF4) +assert(0xFD & 0xAA ~ 0xCC | 0xF0 == 0xF4) +assert(0xF0 & 0x0F + 1 == 0x10) + +assert(3^4//2^3//5 == 2) + +assert(-3+4*5//2^3^2//9+4%10/3 == (-3)+(((4*5)//(2^(3^2)))//9)+((4%10)/3)) + +assert(not ((true or false) and nil)) +assert( true or false and nil) + +-- old bug +assert((((1 or false) and true) or false) == true) +assert((((nil and true) or false) and true) == false) + +local a,b = 1,nil; +assert(-(1 or 2) == -1 and (1 and 2)+(-1.25 or -4) == 0.75); +x = ((b or a)+1 == 2 and (10 or a)+1 == 11); assert(x); +x = (((2<3) or 1) == true and (2<3 and 4) == 4); assert(x); + +x,y=1,2; +assert((x>y) and x or y == 2); +x,y=2,1; +assert((x>y) and x or y == 2); + +assert(1234567890 == tonumber('1234567890') and 1234567890+1 == 1234567891) + + +-- silly loops +repeat until 1; repeat until true; +while false do end; while nil do end; + +do -- test old bug (first name could not be an `upvalue') + local a; function f(x) x={a=1}; x={x=1}; x={G=1} end +end + +function f (i) + if type(i) ~= 'number' then return i,'jojo'; end; + if i > 0 then return i, f(i-1); end; +end + +x = {f(3), f(5), f(10);}; +assert(x[1] == 3 and x[2] == 5 and x[3] == 10 and x[4] == 9 and x[12] == 1); +assert(x[nil] == nil) +x = {f'alo', f'xixi', nil}; +assert(x[1] == 'alo' and x[2] == 'xixi' and x[3] == nil); +x = {f'alo'..'xixi'}; +assert(x[1] == 'aloxixi') +x = {f{}} +assert(x[2] == 'jojo' and type(x[1]) == 'table') + + +local f = function (i) + if i < 10 then return 'a'; + elseif i < 20 then return 'b'; + elseif i < 30 then return 'c'; + end; +end + +assert(f(3) == 'a' and f(12) == 'b' and f(26) == 'c' and f(100) == nil) + +for i=1,1000 do break; end; +n=100; +i=3; +t = {}; +a=nil +while not a do + a=0; for i=1,n do for i=i,1,-1 do a=a+1; t[i]=1; end; end; +end +assert(a == n*(n+1)/2 and i==3); +assert(t[1] and t[n] and not t[0] and not t[n+1]) + +function f(b) + local x = 1; + repeat + local a; + if b==1 then local b=1; x=10; break + elseif b==2 then x=20; break; + elseif b==3 then x=30; + else local a,b,c,d=math.sin(1); x=x+1; + end + until x>=12; + return x; +end; + +assert(f(1) == 10 and f(2) == 20 and f(3) == 30 and f(4)==12) + + +local f = function (i) + if i < 10 then return 'a' + elseif i < 20 then return 'b' + elseif i < 30 then return 'c' + else return 8 + end +end + +assert(f(3) == 'a' and f(12) == 'b' and f(26) == 'c' and f(100) == 8) + +local a, b = nil, 23 +x = {f(100)*2+3 or a, a or b+2} +assert(x[1] == 19 and x[2] == 25) +x = {f=2+3 or a, a = b+2} +assert(x.f == 5 and x.a == 25) + +a={y=1} +x = {a.y} +assert(x[1] == 1) + +function f(i) + while 1 do + if i>0 then i=i-1; + else return; end; + end; +end; + +function g(i) + while 1 do + if i>0 then i=i-1 + else return end + end +end + +f(10); g(10); + +do + function f () return 1,2,3; end + local a, b, c = f(); + assert(a==1 and b==2 and c==3) + a, b, c = (f()); + assert(a==1 and b==nil and c==nil) +end + +local a,b = 3 and f(); +assert(a==1 and b==nil) + +function g() f(); return; end; +assert(g() == nil) +function g() return nil or f() end +a,b = g() +assert(a==1 and b==nil) + +print'+'; + + +f = [[ +return function ( a , b , c , d , e ) + local x = a >= b or c or ( d and e ) or nil + return x +end , { a = 1 , b = 2 >= 1 , } or { 1 }; +]] +f = string.gsub(f, "%s+", "\n"); -- force a SETLINE between opcodes +f,a = load(f)(); +assert(a.a == 1 and a.b) + +function g (a,b,c,d,e) + if not (a>=b or c or d and e or nil) then return 0; else return 1; end; +end + +function h (a,b,c,d,e) + while (a>=b or c or (d and e) or nil) do return 1; end; + return 0; +end; + +assert(f(2,1) == true and g(2,1) == 1 and h(2,1) == 1) +assert(f(1,2,'a') == 'a' and g(1,2,'a') == 1 and h(1,2,'a') == 1) +assert(f(1,2,'a') +~= -- force SETLINE before nil +nil, "") +assert(f(1,2,'a') == 'a' and g(1,2,'a') == 1 and h(1,2,'a') == 1) +assert(f(1,2,nil,1,'x') == 'x' and g(1,2,nil,1,'x') == 1 and + h(1,2,nil,1,'x') == 1) +assert(f(1,2,nil,nil,'x') == nil and g(1,2,nil,nil,'x') == 0 and + h(1,2,nil,nil,'x') == 0) +assert(f(1,2,nil,1,nil) == nil and g(1,2,nil,1,nil) == 0 and + h(1,2,nil,1,nil) == 0) + +assert(1 and 2<3 == true and 2<3 and 'a'<'b' == true) +x = 2<3 and not 3; assert(x==false) +x = 2<1 or (2>1 and 'a'); assert(x=='a') + + +do + local a; if nil then a=1; else a=2; end; -- this nil comes as PUSHNIL 2 + assert(a==2) +end + +function F(a) + assert(debug.getinfo(1, "n").name == 'F') + return a,2,3 +end + +a,b = F(1)~=nil; assert(a == true and b == nil); +a,b = F(nil)==nil; assert(a == true and b == nil) + +---------------------------------------------------------------- +------------------------------------------------------------------ + +-- sometimes will be 0, sometimes will not... +_ENV.GLOB1 = math.floor(os.time()) % 2 + +-- basic expressions with their respective values +local basiccases = { + {"nil", nil}, + {"false", false}, + {"true", true}, + {"10", 10}, + {"(0==_ENV.GLOB1)", 0 == _ENV.GLOB1}, +} + +print('testing short-circuit optimizations (' .. _ENV.GLOB1 .. ')') + + +-- operators with their respective values +local binops = { + {" and ", function (a,b) if not a then return a else return b end end}, + {" or ", function (a,b) if a then return a else return b end end}, +} + +local cases = {} + +-- creates all combinations of '(cases[i] op cases[n-i])' plus +-- 'not(cases[i] op cases[n-i])' (syntax + value) +local function createcases (n) + local res = {} + for i = 1, n - 1 do + for _, v1 in ipairs(cases[i]) do + for _, v2 in ipairs(cases[n - i]) do + for _, op in ipairs(binops) do + local t = { + "(" .. v1[1] .. op[1] .. v2[1] .. ")", + op[2](v1[2], v2[2]) + } + res[#res + 1] = t + res[#res + 1] = {"not" .. t[1], not t[2]} + end + end + end + end + return res +end + +-- do not do too many combinations for soft tests +local level = _soft and 3 or 4 + +cases[1] = basiccases +for i = 2, level do cases[i] = createcases(i) end +print("+") + +local prog = [[if %s then IX = true end; return %s]] + +local i = 0 +for n = 1, level do + for _, v in pairs(cases[n]) do + local s = v[1] + local p = load(string.format(prog, s, s), "") + IX = false + assert(p() == v[2] and IX == not not v[2]) + i = i + 1 + if i % 60000 == 0 then print('+') end + end +end +------------------------------------------------------------------ + +-- testing some syntax errors (chosen through 'gcov') +checkload("for x do", "expected") +checkload("x:call", "expected") + +if not _soft then + -- control structure too long + local s = string.rep("a = a + 1\n", 2^18) + s = "while true do " .. s .. "end" + checkload(s, "too long") +end + +print'OK' diff --git a/06/parser-gen/parsers/lua-5.3.4-tests/coroutine.lua b/06/parser-gen/parsers/lua-5.3.4-tests/coroutine.lua new file mode 100644 index 0000000..c8fc857 --- /dev/null +++ b/06/parser-gen/parsers/lua-5.3.4-tests/coroutine.lua @@ -0,0 +1,874 @@ +-- $Id: coroutine.lua,v 1.42 2016/11/07 13:03:20 roberto Exp $ +-- See Copyright Notice in file all.lua + +print "testing coroutines" + +local debug = require'debug' + +local f + +local main, ismain = coroutine.running() +assert(type(main) == "thread" and ismain) +assert(not coroutine.resume(main)) +assert(not coroutine.isyieldable()) +assert(not pcall(coroutine.yield)) + + +-- trivial errors +assert(not pcall(coroutine.resume, 0)) +assert(not pcall(coroutine.status, 0)) + + +-- tests for multiple yield/resume arguments + +local function eqtab (t1, t2) + assert(#t1 == #t2) + for i = 1, #t1 do + local v = t1[i] + assert(t2[i] == v) + end +end + +_G.x = nil -- declare x +function foo (a, ...) + local x, y = coroutine.running() + assert(x == f and y == false) + -- next call should not corrupt coroutine (but must fail, + -- as it attempts to resume the running coroutine) + assert(coroutine.resume(f) == false) + assert(coroutine.status(f) == "running") + local arg = {...} + assert(coroutine.isyieldable()) + for i=1,#arg do + _G.x = {coroutine.yield(table.unpack(arg[i]))} + end + return table.unpack(a) +end + +f = coroutine.create(foo) +assert(type(f) == "thread" and coroutine.status(f) == "suspended") +assert(string.find(tostring(f), "thread")) +local s,a,b,c,d +s,a,b,c,d = coroutine.resume(f, {1,2,3}, {}, {1}, {'a', 'b', 'c'}) +assert(s and a == nil and coroutine.status(f) == "suspended") +s,a,b,c,d = coroutine.resume(f) +eqtab(_G.x, {}) +assert(s and a == 1 and b == nil) +s,a,b,c,d = coroutine.resume(f, 1, 2, 3) +eqtab(_G.x, {1, 2, 3}) +assert(s and a == 'a' and b == 'b' and c == 'c' and d == nil) +s,a,b,c,d = coroutine.resume(f, "xuxu") +eqtab(_G.x, {"xuxu"}) +assert(s and a == 1 and b == 2 and c == 3 and d == nil) +assert(coroutine.status(f) == "dead") +s, a = coroutine.resume(f, "xuxu") +assert(not s and string.find(a, "dead") and coroutine.status(f) == "dead") + + +-- yields in tail calls +local function foo (i) return coroutine.yield(i) end +f = coroutine.wrap(function () + for i=1,10 do + assert(foo(i) == _G.x) + end + return 'a' +end) +for i=1,10 do _G.x = i; assert(f(i) == i) end +_G.x = 'xuxu'; assert(f('xuxu') == 'a') + +-- recursive +function pf (n, i) + coroutine.yield(n) + pf(n*i, i+1) +end + +f = coroutine.wrap(pf) +local s=1 +for i=1,10 do + assert(f(1, 1) == s) + s = s*i +end + +-- sieve +function gen (n) + return coroutine.wrap(function () + for i=2,n do coroutine.yield(i) end + end) +end + + +function filter (p, g) + return coroutine.wrap(function () + while 1 do + local n = g() + if n == nil then return end + if math.fmod(n, p) ~= 0 then coroutine.yield(n) end + end + end) +end + +local x = gen(100) +local a = {} +while 1 do + local n = x() + if n == nil then break end + table.insert(a, n) + x = filter(n, x) +end + +assert(#a == 25 and a[#a] == 97) +x, a = nil + +-- yielding across C boundaries + +co = coroutine.wrap(function() + assert(not pcall(table.sort,{1,2,3}, coroutine.yield)) + assert(coroutine.isyieldable()) + coroutine.yield(20) + return 30 + end) + +assert(co() == 20) +assert(co() == 30) + + +local f = function (s, i) return coroutine.yield(i) end + +local f1 = coroutine.wrap(function () + return xpcall(pcall, function (...) return ... end, + function () + local s = 0 + for i in f, nil, 1 do pcall(function () s = s + i end) end + error({s}) + end) + end) + +f1() +for i = 1, 10 do assert(f1(i) == i) end +local r1, r2, v = f1(nil) +assert(r1 and not r2 and v[1] == (10 + 1)*10/2) + + +function f (a, b) a = coroutine.yield(a); error{a + b} end +function g(x) return x[1]*2 end + +co = coroutine.wrap(function () + coroutine.yield(xpcall(f, g, 10, 20)) + end) + +assert(co() == 10) +r, msg = co(100) +assert(not r and msg == 240) + + +-- unyieldable C call +do + local function f (c) + assert(not coroutine.isyieldable()) + return c .. c + end + + local co = coroutine.wrap(function (c) + assert(coroutine.isyieldable()) + local s = string.gsub("a", ".", f) + return s + end) + assert(co() == "aa") +end + + +-- errors in coroutines +function foo () + assert(debug.getinfo(1).currentline == debug.getinfo(foo).linedefined + 1) + assert(debug.getinfo(2).currentline == debug.getinfo(goo).linedefined) + coroutine.yield(3) + error(foo) +end + +function goo() foo() end +x = coroutine.wrap(goo) +assert(x() == 3) +local a,b = pcall(x) +assert(not a and b == foo) + +x = coroutine.create(goo) +a,b = coroutine.resume(x) +assert(a and b == 3) +a,b = coroutine.resume(x) +assert(not a and b == foo and coroutine.status(x) == "dead") +a,b = coroutine.resume(x) +assert(not a and string.find(b, "dead") and coroutine.status(x) == "dead") + + +-- co-routines x for loop +function all (a, n, k) + if k == 0 then coroutine.yield(a) + else + for i=1,n do + a[k] = i + all(a, n, k-1) + end + end +end + +local a = 0 +for t in coroutine.wrap(function () all({}, 5, 4) end) do + a = a+1 +end +assert(a == 5^4) + + +-- access to locals of collected corroutines +local C = {}; setmetatable(C, {__mode = "kv"}) +local x = coroutine.wrap (function () + local a = 10 + local function f () a = a+10; return a end + while true do + a = a+1 + coroutine.yield(f) + end + end) + +C[1] = x; + +local f = x() +assert(f() == 21 and x()() == 32 and x() == f) +x = nil +collectgarbage() +assert(C[1] == nil) +assert(f() == 43 and f() == 53) + + +-- old bug: attempt to resume itself + +function co_func (current_co) + assert(coroutine.running() == current_co) + assert(coroutine.resume(current_co) == false) + coroutine.yield(10, 20) + assert(coroutine.resume(current_co) == false) + coroutine.yield(23) + return 10 +end + +local co = coroutine.create(co_func) +local a,b,c = coroutine.resume(co, co) +assert(a == true and b == 10 and c == 20) +a,b = coroutine.resume(co, co) +assert(a == true and b == 23) +a,b = coroutine.resume(co, co) +assert(a == true and b == 10) +assert(coroutine.resume(co, co) == false) +assert(coroutine.resume(co, co) == false) + + +-- other old bug when attempting to resume itself +-- (trigger C-code assertions) +do + local A = coroutine.running() + local B = coroutine.create(function() return coroutine.resume(A) end) + local st, res = coroutine.resume(B) + assert(st == true and res == false) + + A = coroutine.wrap(function() return pcall(A, 1) end) + st, res = A() + assert(not st and string.find(res, "non%-suspended")) +end + + +-- attempt to resume 'normal' coroutine +local co1, co2 +co1 = coroutine.create(function () return co2() end) +co2 = coroutine.wrap(function () + assert(coroutine.status(co1) == 'normal') + assert(not coroutine.resume(co1)) + coroutine.yield(3) + end) + +a,b = coroutine.resume(co1) +assert(a and b == 3) +assert(coroutine.status(co1) == 'dead') + +-- infinite recursion of coroutines +a = function(a) coroutine.wrap(a)(a) end +assert(not pcall(a, a)) +a = nil + + +-- access to locals of erroneous coroutines +local x = coroutine.create (function () + local a = 10 + _G.f = function () a=a+1; return a end + error('x') + end) + +assert(not coroutine.resume(x)) +-- overwrite previous position of local `a' +assert(not coroutine.resume(x, 1, 1, 1, 1, 1, 1, 1)) +assert(_G.f() == 11) +assert(_G.f() == 12) + + +if not T then + (Message or print)('\n >>> testC not active: skipping yield/hook tests <<<\n') +else + print "testing yields inside hooks" + + local turn + + function fact (t, x) + assert(turn == t) + if x == 0 then return 1 + else return x*fact(t, x-1) + end + end + + local A, B = 0, 0 + + local x = coroutine.create(function () + T.sethook("yield 0", "", 2) + A = fact("A", 6) + end) + + local y = coroutine.create(function () + T.sethook("yield 0", "", 3) + B = fact("B", 7) + end) + + while A==0 or B==0 do -- A ~= 0 when 'x' finishes (similar for 'B','y') + if A==0 then turn = "A"; assert(T.resume(x)) end + if B==0 then turn = "B"; assert(T.resume(y)) end + end + + assert(B // A == 7) -- fact(7) // fact(6) + + local line = debug.getinfo(1, "l").currentline + 2 -- get line number + local function foo () + local x = 10 --<< this line is 'line' + x = x + 10 + _G.XX = x + end + + -- testing yields in line hook + local co = coroutine.wrap(function () + T.sethook("setglobal X; yield 0", "l", 0); foo(); return 10 end) + + _G.XX = nil; + _G.X = nil; co(); assert(_G.X == line) + _G.X = nil; co(); assert(_G.X == line + 1) + _G.X = nil; co(); assert(_G.X == line + 2 and _G.XX == nil) + _G.X = nil; co(); assert(_G.X == line + 3 and _G.XX == 20) + assert(co() == 10) + + -- testing yields in count hook + co = coroutine.wrap(function () + T.sethook("yield 0", "", 1); foo(); return 10 end) + + _G.XX = nil; + local c = 0 + repeat c = c + 1; local a = co() until a == 10 + assert(_G.XX == 20 and c >= 5) + + co = coroutine.wrap(function () + T.sethook("yield 0", "", 2); foo(); return 10 end) + + _G.XX = nil; + local c = 0 + repeat c = c + 1; local a = co() until a == 10 + assert(_G.XX == 20 and c >= 5) + _G.X = nil; _G.XX = nil + + do + -- testing debug library on a coroutine suspended inside a hook + -- (bug in 5.2/5.3) + c = coroutine.create(function (a, ...) + T.sethook("yield 0", "l") -- will yield on next two lines + assert(a == 10) + return ... + end) + + assert(coroutine.resume(c, 1, 2, 3)) -- start coroutine + local n,v = debug.getlocal(c, 0, 1) -- check its local + assert(n == "a" and v == 1) + n,v = debug.getlocal(c, 0, -1) -- check varargs + assert(v == 2) + n,v = debug.getlocal(c, 0, -2) + assert(v == 3) + assert(debug.setlocal(c, 0, 1, 10)) -- test 'setlocal' + assert(debug.setlocal(c, 0, -2, 20)) + local t = debug.getinfo(c, 0) -- test 'getinfo' + assert(t.currentline == t.linedefined + 1) + assert(not debug.getinfo(c, 1)) -- no other level + assert(coroutine.resume(c)) -- run next line + v = {coroutine.resume(c)} -- finish coroutine + assert(v[1] == true and v[2] == 2 and v[3] == 20 and v[4] == nil) + assert(not coroutine.resume(c)) + end + + do + -- testing debug library on last function in a suspended coroutine + -- (bug in 5.2/5.3) + local c = coroutine.create(function () T.testC("yield 1", 10, 20) end) + local a, b = coroutine.resume(c) + assert(a and b == 20) + assert(debug.getinfo(c, 0).linedefined == -1) + a, b = debug.getlocal(c, 0, 2) + assert(b == 10) + end + + + print "testing coroutine API" + + -- reusing a thread + assert(T.testC([[ + newthread # create thread + pushvalue 2 # push body + pushstring 'a a a' # push argument + xmove 0 3 2 # move values to new thread + resume -1, 1 # call it first time + pushstatus + xmove 3 0 0 # move results back to stack + setglobal X # result + setglobal Y # status + pushvalue 2 # push body (to call it again) + pushstring 'b b b' + xmove 0 3 2 + resume -1, 1 # call it again + pushstatus + xmove 3 0 0 + return 1 # return result + ]], function (...) return ... end) == 'b b b') + + assert(X == 'a a a' and Y == 'OK') + + + -- resuming running coroutine + C = coroutine.create(function () + return T.testC([[ + pushnum 10; + pushnum 20; + resume -3 2; + pushstatus + gettop; + return 3]], C) + end) + local a, b, c, d = coroutine.resume(C) + assert(a == true and string.find(b, "non%-suspended") and + c == "ERRRUN" and d == 4) + + a, b, c, d = T.testC([[ + rawgeti R 1 # get main thread + pushnum 10; + pushnum 20; + resume -3 2; + pushstatus + gettop; + return 4]]) + assert(a == coroutine.running() and string.find(b, "non%-suspended") and + c == "ERRRUN" and d == 4) + + + -- using a main thread as a coroutine + local state = T.newstate() + T.loadlib(state) + + assert(T.doremote(state, [[ + coroutine = require'coroutine'; + X = function (x) coroutine.yield(x, 'BB'); return 'CC' end; + return 'ok']])) + + t = table.pack(T.testC(state, [[ + rawgeti R 1 # get main thread + pushstring 'XX' + getglobal X # get function for body + pushstring AA # arg + resume 1 1 # 'resume' shadows previous stack! + gettop + setglobal T # top + setglobal B # second yielded value + setglobal A # fist yielded value + rawgeti R 1 # get main thread + pushnum 5 # arg (noise) + resume 1 1 # after coroutine ends, previous stack is back + pushstatus + return * + ]])) + assert(t.n == 4 and t[2] == 'XX' and t[3] == 'CC' and t[4] == 'OK') + assert(T.doremote(state, "return T") == '2') + assert(T.doremote(state, "return A") == 'AA') + assert(T.doremote(state, "return B") == 'BB') + + T.closestate(state) + + print'+' + +end + + +-- leaving a pending coroutine open +_X = coroutine.wrap(function () + local a = 10 + local x = function () a = a+1 end + coroutine.yield() + end) + +_X() + + +if not _soft then + -- bug (stack overflow) + local j = 2^9 + local lim = 1000000 -- (C stack limit; assume 32-bit machine) + local t = {lim - 10, lim - 5, lim - 1, lim, lim + 1} + for i = 1, #t do + local j = t[i] + co = coroutine.create(function() + local t = {} + for i = 1, j do t[i] = i end + return table.unpack(t) + end) + local r, msg = coroutine.resume(co) + assert(not r) + end + co = nil +end + + +assert(coroutine.running() == main) + +print"+" + + +print"testing yields inside metamethods" + +local mt = { + __eq = function(a,b) coroutine.yield(nil, "eq"); return a.x == b.x end, + __lt = function(a,b) coroutine.yield(nil, "lt"); return a.x < b.x end, + __le = function(a,b) coroutine.yield(nil, "le"); return a - b <= 0 end, + __add = function(a,b) coroutine.yield(nil, "add"); return a.x + b.x end, + __sub = function(a,b) coroutine.yield(nil, "sub"); return a.x - b.x end, + __mod = function(a,b) coroutine.yield(nil, "mod"); return a.x % b.x end, + __unm = function(a,b) coroutine.yield(nil, "unm"); return -a.x end, + __bnot = function(a,b) coroutine.yield(nil, "bnot"); return ~a.x end, + __shl = function(a,b) coroutine.yield(nil, "shl"); return a.x << b.x end, + __shr = function(a,b) coroutine.yield(nil, "shr"); return a.x >> b.x end, + __band = function(a,b) + a = type(a) == "table" and a.x or a + b = type(b) == "table" and b.x or b + coroutine.yield(nil, "band") + return a & b + end, + __bor = function(a,b) coroutine.yield(nil, "bor"); return a.x | b.x end, + __bxor = function(a,b) coroutine.yield(nil, "bxor"); return a.x ~ b.x end, + + __concat = function(a,b) + coroutine.yield(nil, "concat"); + a = type(a) == "table" and a.x or a + b = type(b) == "table" and b.x or b + return a .. b + end, + __index = function (t,k) coroutine.yield(nil, "idx"); return t.k[k] end, + __newindex = function (t,k,v) coroutine.yield(nil, "nidx"); t.k[k] = v end, +} + + +local function new (x) + return setmetatable({x = x, k = {}}, mt) +end + + +local a = new(10) +local b = new(12) +local c = new"hello" + +local function run (f, t) + local i = 1 + local c = coroutine.wrap(f) + while true do + local res, stat = c() + if res then assert(t[i] == nil); return res, t end + assert(stat == t[i]) + i = i + 1 + end +end + + +assert(run(function () if (a>=b) then return '>=' else return '<' end end, + {"le", "sub"}) == "<") +-- '<=' using '<' +mt.__le = nil +assert(run(function () if (a<=b) then return '<=' else return '>' end end, + {"lt"}) == "<=") +assert(run(function () if (a==b) then return '==' else return '~=' end end, + {"eq"}) == "~=") + +assert(run(function () return a & b + a end, {"add", "band"}) == 2) + +assert(run(function () return a % b end, {"mod"}) == 10) + +assert(run(function () return ~a & b end, {"bnot", "band"}) == ~10 & 12) +assert(run(function () return a | b end, {"bor"}) == 10 | 12) +assert(run(function () return a ~ b end, {"bxor"}) == 10 ~ 12) +assert(run(function () return a << b end, {"shl"}) == 10 << 12) +assert(run(function () return a >> b end, {"shr"}) == 10 >> 12) + +assert(run(function () return a..b end, {"concat"}) == "1012") + +assert(run(function() return a .. b .. c .. a end, + {"concat", "concat", "concat"}) == "1012hello10") + +assert(run(function() return "a" .. "b" .. a .. "c" .. c .. b .. "x" end, + {"concat", "concat", "concat"}) == "ab10chello12x") + + +do -- a few more tests for comparsion operators + local mt1 = { + __le = function (a,b) + coroutine.yield(10) + return + (type(a) == "table" and a.x or a) <= (type(b) == "table" and b.x or b) + end, + __lt = function (a,b) + coroutine.yield(10) + return + (type(a) == "table" and a.x or a) < (type(b) == "table" and b.x or b) + end, + } + local mt2 = { __lt = mt1.__lt } -- no __le + + local function run (f) + local co = coroutine.wrap(f) + local res + repeat + res = co() + until res ~= 10 + return res + end + + local function test () + local a1 = setmetatable({x=1}, mt1) + local a2 = setmetatable({x=2}, mt2) + assert(a1 < a2) + assert(a1 <= a2) + assert(1 < a2) + assert(1 <= a2) + assert(2 > a1) + assert(2 >= a2) + return true + end + + run(test) + +end + +assert(run(function () + a.BB = print + return a.BB + end, {"nidx", "idx"}) == print) + +-- getuptable & setuptable +do local _ENV = _ENV + f = function () AAA = BBB + 1; return AAA end +end +g = new(10); g.k.BBB = 10; +debug.setupvalue(f, 1, g) +assert(run(f, {"idx", "nidx", "idx"}) == 11) +assert(g.k.AAA == 11) + +print"+" + +print"testing yields inside 'for' iterators" + +local f = function (s, i) + if i%2 == 0 then coroutine.yield(nil, "for") end + if i < s then return i + 1 end + end + +assert(run(function () + local s = 0 + for i in f, 4, 0 do s = s + i end + return s + end, {"for", "for", "for"}) == 10) + + + +-- tests for coroutine API +if T==nil then + (Message or print)('\n >>> testC not active: skipping coroutine API tests <<<\n') + return +end + +print('testing coroutine API') + +local function apico (...) + local x = {...} + return coroutine.wrap(function () + return T.testC(table.unpack(x)) + end) +end + +local a = {apico( +[[ + pushstring errorcode + pcallk 1 0 2; + invalid command (should not arrive here) +]], +[[return *]], +"stackmark", +error +)()} +assert(#a == 4 and + a[3] == "stackmark" and + a[4] == "errorcode" and + _G.status == "ERRRUN" and + _G.ctx == 2) -- 'ctx' to pcallk + +local co = apico( + "pushvalue 2; pushnum 10; pcallk 1 2 3; invalid command;", + coroutine.yield, + "getglobal status; getglobal ctx; pushvalue 2; pushstring a; pcallk 1 0 4; invalid command", + "getglobal status; getglobal ctx; return *") + +assert(co() == 10) +assert(co(20, 30) == 'a') +a = {co()} +assert(#a == 10 and + a[2] == coroutine.yield and + a[5] == 20 and a[6] == 30 and + a[7] == "YIELD" and a[8] == 3 and + a[9] == "YIELD" and a[10] == 4) +assert(not pcall(co)) -- coroutine is dead now + + +f = T.makeCfunc("pushnum 3; pushnum 5; yield 1;") +co = coroutine.wrap(function () + assert(f() == 23); assert(f() == 23); return 10 +end) +assert(co(23,16) == 5) +assert(co(23,16) == 5) +assert(co(23,16) == 10) + + +-- testing coroutines with C bodies +f = T.makeCfunc([[ + pushnum 102 + yieldk 1 U2 + cannot be here! +]], +[[ # continuation + pushvalue U3 # accessing upvalues inside a continuation + pushvalue U4 + return * +]], 23, "huu") + +x = coroutine.wrap(f) +assert(x() == 102) +eqtab({x()}, {23, "huu"}) + + +f = T.makeCfunc[[pushstring 'a'; pushnum 102; yield 2; ]] + +a, b, c, d = T.testC([[newthread; pushvalue 2; xmove 0 3 1; resume 3 0; + pushstatus; xmove 3 0 0; resume 3 0; pushstatus; + return 4; ]], f) + +assert(a == 'YIELD' and b == 'a' and c == 102 and d == 'OK') + + +-- testing chain of suspendable C calls + +local count = 3 -- number of levels + +f = T.makeCfunc([[ + remove 1; # remove argument + pushvalue U3; # get selection function + call 0 1; # call it (result is 'f' or 'yield') + pushstring hello # single argument for selected function + pushupvalueindex 2; # index of continuation program + callk 1 -1 .; # call selected function + errorerror # should never arrive here +]], +[[ + # continuation program + pushnum 34 # return value + return * # return all results +]], +function () -- selection function + count = count - 1 + if count == 0 then return coroutine.yield + else return f + end +end +) + +co = coroutine.wrap(function () return f(nil) end) +assert(co() == "hello") -- argument to 'yield' +a = {co()} +-- three '34's (one from each pending C call) +assert(#a == 3 and a[1] == a[2] and a[2] == a[3] and a[3] == 34) + + +-- testing yields with continuations + +co = coroutine.wrap(function (...) return + T.testC([[ # initial function + yieldk 1 2 + cannot be here! + ]], + [[ # 1st continuation + yieldk 0 3 + cannot be here! + ]], + [[ # 2nd continuation + yieldk 0 4 + cannot be here! + ]], + [[ # 3th continuation + pushvalue 6 # function which is last arg. to 'testC' here + pushnum 10; pushnum 20; + pcall 2 0 0 # call should throw an error and return to next line + pop 1 # remove error message + pushvalue 6 + getglobal status; getglobal ctx + pcallk 2 2 5 # call should throw an error and jump to continuation + cannot be here! + ]], + [[ # 4th (and last) continuation + return * + ]], + -- function called by 3th continuation + function (a,b) x=a; y=b; error("errmsg") end, + ... +) +end) + +local a = {co(3,4,6)} +assert(a[1] == 6 and a[2] == nil) +a = {co()}; assert(a[1] == nil and _G.status == "YIELD" and _G.ctx == 2) +a = {co()}; assert(a[1] == nil and _G.status == "YIELD" and _G.ctx == 3) +a = {co(7,8)}; +-- original arguments +assert(type(a[1]) == 'string' and type(a[2]) == 'string' and + type(a[3]) == 'string' and type(a[4]) == 'string' and + type(a[5]) == 'string' and type(a[6]) == 'function') +-- arguments left from fist resume +assert(a[7] == 3 and a[8] == 4) +-- arguments to last resume +assert(a[9] == 7 and a[10] == 8) +-- error message and nothing more +assert(a[11]:find("errmsg") and #a == 11) +-- check arguments to pcallk +assert(x == "YIELD" and y == 4) + +assert(not pcall(co)) -- coroutine should be dead + + +-- bug in nCcalls +local co = coroutine.wrap(function () + local a = {pcall(pcall,pcall,pcall,pcall,pcall,pcall,pcall,error,"hi")} + return pcall(assert, table.unpack(a)) +end) + +local a = {co()} +assert(a[10] == "hi") + +print'OK' diff --git a/06/parser-gen/parsers/lua-5.3.4-tests/db.lua b/06/parser-gen/parsers/lua-5.3.4-tests/db.lua new file mode 100644 index 0000000..004f57a --- /dev/null +++ b/06/parser-gen/parsers/lua-5.3.4-tests/db.lua @@ -0,0 +1,857 @@ +-- $Id: db.lua,v 1.79 2016/11/07 13:02:34 roberto Exp $ +-- See Copyright Notice in file all.lua + +-- testing debug library + +local debug = require "debug" + +local function dostring(s) return assert(load(s))() end + +print"testing debug library and debug information" + +do +local a=1 +end + +assert(not debug.gethook()) + +local testline = 19 -- line where 'test' is defined +function test (s, l, p) -- this must be line 19 + collectgarbage() -- avoid gc during trace + local function f (event, line) + assert(event == 'line') + local l = table.remove(l, 1) + if p then print(l, line) end + assert(l == line, "wrong trace!!") + end + debug.sethook(f,"l"); load(s)(); debug.sethook() + assert(#l == 0) +end + + +do + assert(not pcall(debug.getinfo, print, "X")) -- invalid option + assert(not debug.getinfo(1000)) -- out of range level + assert(not debug.getinfo(-1)) -- out of range level + local a = debug.getinfo(print) + assert(a.what == "C" and a.short_src == "[C]") + a = debug.getinfo(print, "L") + assert(a.activelines == nil) + local b = debug.getinfo(test, "SfL") + assert(b.name == nil and b.what == "Lua" and b.linedefined == testline and + b.lastlinedefined == b.linedefined + 10 and + b.func == test and not string.find(b.short_src, "%[")) + assert(b.activelines[b.linedefined + 1] and + b.activelines[b.lastlinedefined]) + assert(not b.activelines[b.linedefined] and + not b.activelines[b.lastlinedefined + 1]) +end + + +-- test file and string names truncation +a = "function f () end" +local function dostring (s, x) return load(s, x)() end +dostring(a) +assert(debug.getinfo(f).short_src == string.format('[string "%s"]', a)) +dostring(a..string.format("; %s\n=1", string.rep('p', 400))) +assert(string.find(debug.getinfo(f).short_src, '^%[string [^\n]*%.%.%."%]$')) +dostring(a..string.format("; %s=1", string.rep('p', 400))) +assert(string.find(debug.getinfo(f).short_src, '^%[string [^\n]*%.%.%."%]$')) +dostring("\n"..a) +assert(debug.getinfo(f).short_src == '[string "..."]') +dostring(a, "") +assert(debug.getinfo(f).short_src == '[string ""]') +dostring(a, "@xuxu") +assert(debug.getinfo(f).short_src == "xuxu") +dostring(a, "@"..string.rep('p', 1000)..'t') +assert(string.find(debug.getinfo(f).short_src, "^%.%.%.p*t$")) +dostring(a, "=xuxu") +assert(debug.getinfo(f).short_src == "xuxu") +dostring(a, string.format("=%s", string.rep('x', 500))) +assert(string.find(debug.getinfo(f).short_src, "^x*$")) +dostring(a, "=") +assert(debug.getinfo(f).short_src == "") +a = nil; f = nil; + + +repeat + local g = {x = function () + local a = debug.getinfo(2) + assert(a.name == 'f' and a.namewhat == 'local') + a = debug.getinfo(1) + assert(a.name == 'x' and a.namewhat == 'field') + return 'xixi' + end} + local f = function () return 1+1 and (not 1 or g.x()) end + assert(f() == 'xixi') + g = debug.getinfo(f) + assert(g.what == "Lua" and g.func == f and g.namewhat == "" and not g.name) + + function f (x, name) -- local! + name = name or 'f' + local a = debug.getinfo(1) + assert(a.name == name and a.namewhat == 'local') + return x + end + + -- breaks in different conditions + if 3>4 then break end; f() + if 3<4 then a=1 else break end; f() + while 1 do local x=10; break end; f() + local b = 1 + if 3>4 then return math.sin(1) end; f() + a = 3<4; f() + a = 3<4 or 1; f() + repeat local x=20; if 4>3 then f() else break end; f() until 1 + g = {} + f(g).x = f(2) and f(10)+f(9) + assert(g.x == f(19)) + function g(x) if not x then return 3 end return (x('a', 'x')) end + assert(g(f) == 'a') +until 1 + +test([[if +math.sin(1) +then + a=1 +else + a=2 +end +]], {2,3,4,7}) + +test([[-- +if nil then + a=1 +else + a=2 +end +]], {2,5,6}) + +test([[a=1 +repeat + a=a+1 +until a==3 +]], {1,3,4,3,4}) + +test([[ do + return +end +]], {2}) + +test([[local a +a=1 +while a<=3 do + a=a+1 +end +]], {1,2,3,4,3,4,3,4,3,5}) + +test([[while math.sin(1) do + if math.sin(1) + then break + end +end +a=1]], {1,2,3,6}) + +test([[for i=1,3 do + a=i +end +]], {1,2,1,2,1,2,1,3}) + +test([[for i,v in pairs{'a','b'} do + a=tostring(i) .. v +end +]], {1,2,1,2,1,3}) + +test([[for i=1,4 do a=1 end]], {1,1,1,1,1}) + + + +print'+' + +-- invalid levels in [gs]etlocal +assert(not pcall(debug.getlocal, 20, 1)) +assert(not pcall(debug.setlocal, -1, 1, 10)) + + +-- parameter names +local function foo (a,b,...) local d, e end +local co = coroutine.create(foo) + +assert(debug.getlocal(foo, 1) == 'a') +assert(debug.getlocal(foo, 2) == 'b') +assert(not debug.getlocal(foo, 3)) +assert(debug.getlocal(co, foo, 1) == 'a') +assert(debug.getlocal(co, foo, 2) == 'b') +assert(not debug.getlocal(co, foo, 3)) + +assert(not debug.getlocal(print, 1)) + + +-- varargs +local function foo (a, ...) + local t = table.pack(...) + for i = 1, t.n do + local n, v = debug.getlocal(1, -i) + assert(n == "(*vararg)" and v == t[i]) + end + assert(not debug.getlocal(1, -(t.n + 1))) + assert(not debug.setlocal(1, -(t.n + 1), 30)) + if t.n > 0 then + (function (x) + assert(debug.setlocal(2, -1, x) == "(*vararg)") + assert(debug.setlocal(2, -t.n, x) == "(*vararg)") + end)(430) + assert(... == 430) + end +end + +foo() +foo(print) +foo(200, 3, 4) +local a = {} +for i = 1, (_soft and 100 or 1000) do a[i] = i end +foo(table.unpack(a)) +a = nil + +-- access to vararg in non-vararg function +local function foo () return debug.getlocal(1, -1) end +assert(not foo(10)) + + +do -- test hook presence in debug info + assert(not debug.gethook()) + local count = 0 + local function f () + assert(debug.getinfo(1).namewhat == "hook") + local sndline = string.match(debug.traceback(), "\n(.-)\n") + assert(string.find(sndline, "hook")) + count = count + 1 + end + debug.sethook(f, "l") + local a = 0 + _ENV.a = a + a = 1 + debug.sethook() + assert(count == 4) +end + + +a = {}; L = nil +local glob = 1 +local oldglob = glob +debug.sethook(function (e,l) + collectgarbage() -- force GC during a hook + local f, m, c = debug.gethook() + assert(m == 'crl' and c == 0) + if e == "line" then + if glob ~= oldglob then + L = l-1 -- get the first line where "glob" has changed + oldglob = glob + end + elseif e == "call" then + local f = debug.getinfo(2, "f").func + a[f] = 1 + else assert(e == "return") + end +end, "crl") + + +function f(a,b) + collectgarbage() + local _, x = debug.getlocal(1, 1) + local _, y = debug.getlocal(1, 2) + assert(x == a and y == b) + assert(debug.setlocal(2, 3, "pera") == "AA".."AA") + assert(debug.setlocal(2, 4, "ma") == "B") + x = debug.getinfo(2) + assert(x.func == g and x.what == "Lua" and x.name == 'g' and + x.nups == 2 and string.find(x.source, "^@.*db%.lua$")) + glob = glob+1 + assert(debug.getinfo(1, "l").currentline == L+1) + assert(debug.getinfo(1, "l").currentline == L+2) +end + +function foo() + glob = glob+1 + assert(debug.getinfo(1, "l").currentline == L+1) +end; foo() -- set L +-- check line counting inside strings and empty lines + +_ = 'alo\ +alo' .. [[ + +]] +--[[ +]] +assert(debug.getinfo(1, "l").currentline == L+11) -- check count of lines + + +function g(...) + local arg = {...} + do local a,b,c; a=math.sin(40); end + local feijao + local AAAA,B = "xuxu", "mamo" + f(AAAA,B) + assert(AAAA == "pera" and B == "ma") + do + local B = 13 + local x,y = debug.getlocal(1,5) + assert(x == 'B' and y == 13) + end +end + +g() + + +assert(a[f] and a[g] and a[assert] and a[debug.getlocal] and not a[print]) + + +-- tests for manipulating non-registered locals (C and Lua temporaries) + +local n, v = debug.getlocal(0, 1) +assert(v == 0 and n == "(*temporary)") +local n, v = debug.getlocal(0, 2) +assert(v == 2 and n == "(*temporary)") +assert(not debug.getlocal(0, 3)) +assert(not debug.getlocal(0, 0)) + +function f() + assert(select(2, debug.getlocal(2,3)) == 1) + assert(not debug.getlocal(2,4)) + debug.setlocal(2, 3, 10) + return 20 +end + +function g(a,b) return (a+1) + f() end + +assert(g(0,0) == 30) + + +debug.sethook(nil); +assert(debug.gethook() == nil) + + +-- testing access to function arguments + +local function collectlocals (level) + local tab = {} + for i = 1, math.huge do + local n, v = debug.getlocal(level + 1, i) + if not (n and string.find(n, "^[a-zA-Z0-9_]+$")) then + break -- consider only real variables + end + tab[n] = v + end + return tab +end + + +X = nil +a = {} +function a:f (a, b, ...) local arg = {...}; local c = 13 end +debug.sethook(function (e) + assert(e == "call") + dostring("XX = 12") -- test dostring inside hooks + -- testing errors inside hooks + assert(not pcall(load("a='joao'+1"))) + debug.sethook(function (e, l) + assert(debug.getinfo(2, "l").currentline == l) + local f,m,c = debug.gethook() + assert(e == "line") + assert(m == 'l' and c == 0) + debug.sethook(nil) -- hook is called only once + assert(not X) -- check that + X = collectlocals(2) + end, "l") +end, "c") + +a:f(1,2,3,4,5) +assert(X.self == a and X.a == 1 and X.b == 2 and X.c == nil) +assert(XX == 12) +assert(debug.gethook() == nil) + + +-- testing access to local variables in return hook (bug in 5.2) +do + local function foo (a, b) + do local x,y,z end + local c, d = 10, 20 + return + end + + local function aux () + if debug.getinfo(2).name == "foo" then + foo = nil -- to signal that it found 'foo' + local tab = {a = 100, b = 200, c = 10, d = 20} + for n, v in pairs(collectlocals(2)) do + assert(tab[n] == v) + tab[n] = nil + end + assert(next(tab) == nil) -- 'tab' must be empty + end + end + + debug.sethook(aux, "r"); foo(100, 200); debug.sethook() + assert(foo == nil) +end + +-- testing upvalue access +local function getupvalues (f) + local t = {} + local i = 1 + while true do + local name, value = debug.getupvalue(f, i) + if not name then break end + assert(not t[name]) + t[name] = value + i = i + 1 + end + return t +end + +local a,b,c = 1,2,3 +local function foo1 (a) b = a; return c end +local function foo2 (x) a = x; return c+b end +assert(not debug.getupvalue(foo1, 3)) +assert(not debug.getupvalue(foo1, 0)) +assert(not debug.setupvalue(foo1, 3, "xuxu")) +local t = getupvalues(foo1) +assert(t.a == nil and t.b == 2 and t.c == 3) +t = getupvalues(foo2) +assert(t.a == 1 and t.b == 2 and t.c == 3) +assert(debug.setupvalue(foo1, 1, "xuxu") == "b") +assert(({debug.getupvalue(foo2, 3)})[2] == "xuxu") +-- upvalues of C functions are allways "called" "" (the empty string) +assert(debug.getupvalue(string.gmatch("x", "x"), 1) == "") + + +-- testing count hooks +local a=0 +debug.sethook(function (e) a=a+1 end, "", 1) +a=0; for i=1,1000 do end; assert(1000 < a and a < 1012) +debug.sethook(function (e) a=a+1 end, "", 4) +a=0; for i=1,1000 do end; assert(250 < a and a < 255) +local f,m,c = debug.gethook() +assert(m == "" and c == 4) +debug.sethook(function (e) a=a+1 end, "", 4000) +a=0; for i=1,1000 do end; assert(a == 0) + +do + debug.sethook(print, "", 2^24 - 1) -- count upperbound + local f,m,c = debug.gethook() + assert(({debug.gethook()})[3] == 2^24 - 1) +end + +debug.sethook() + + +-- tests for tail calls +local function f (x) + if x then + assert(debug.getinfo(1, "S").what == "Lua") + assert(debug.getinfo(1, "t").istailcall == true) + local tail = debug.getinfo(2) + assert(tail.func == g1 and tail.istailcall == true) + assert(debug.getinfo(3, "S").what == "main") + print"+" + end +end + +function g(x) return f(x) end + +function g1(x) g(x) end + +local function h (x) local f=g1; return f(x) end + +h(true) + +local b = {} +debug.sethook(function (e) table.insert(b, e) end, "cr") +h(false) +debug.sethook() +local res = {"return", -- first return (from sethook) + "call", "tail call", "call", "tail call", + "return", "return", + "call", -- last call (to sethook) +} +for i = 1, #res do assert(res[i] == table.remove(b, 1)) end + +b = 0 +debug.sethook(function (e) + if e == "tail call" then + b = b + 1 + assert(debug.getinfo(2, "t").istailcall == true) + else + assert(debug.getinfo(2, "t").istailcall == false) + end + end, "c") +h(false) +debug.sethook() +assert(b == 2) -- two tail calls + +lim = _soft and 3000 or 30000 +local function foo (x) + if x==0 then + assert(debug.getinfo(2).what == "main") + local info = debug.getinfo(1) + assert(info.istailcall == true and info.func == foo) + else return foo(x-1) + end +end + +foo(lim) + + +print"+" + + +-- testing local function information +co = load[[ + local A = function () + return x + end + return +]] + +local a = 0 +-- 'A' should be visible to debugger only after its complete definition +debug.sethook(function (e, l) + if l == 3 then a = a + 1; assert(debug.getlocal(2, 1) == "(*temporary)") + elseif l == 4 then a = a + 1; assert(debug.getlocal(2, 1) == "A") + end +end, "l") +co() -- run local function definition +debug.sethook() -- turn off hook +assert(a == 2) -- ensure all two lines where hooked + +-- testing traceback + +assert(debug.traceback(print) == print) +assert(debug.traceback(print, 4) == print) +assert(string.find(debug.traceback("hi", 4), "^hi\n")) +assert(string.find(debug.traceback("hi"), "^hi\n")) +assert(not string.find(debug.traceback("hi"), "'debug.traceback'")) +assert(string.find(debug.traceback("hi", 0), "'debug.traceback'")) +assert(string.find(debug.traceback(), "^stack traceback:\n")) + +do -- C-function names in traceback + local st, msg = (function () return pcall end)()(debug.traceback) + assert(st == true and string.find(msg, "pcall")) +end + + +-- testing nparams, nups e isvararg +local t = debug.getinfo(print, "u") +assert(t.isvararg == true and t.nparams == 0 and t.nups == 0) + +t = debug.getinfo(function (a,b,c) end, "u") +assert(t.isvararg == false and t.nparams == 3 and t.nups == 0) + +t = debug.getinfo(function (a,b,...) return t[a] end, "u") +assert(t.isvararg == true and t.nparams == 2 and t.nups == 1) + +t = debug.getinfo(1) -- main +assert(t.isvararg == true and t.nparams == 0 and t.nups == 1 and + debug.getupvalue(t.func, 1) == "_ENV") + + + + +-- testing debugging of coroutines + +local function checktraceback (co, p, level) + local tb = debug.traceback(co, nil, level) + local i = 0 + for l in string.gmatch(tb, "[^\n]+\n?") do + assert(i == 0 or string.find(l, p[i])) + i = i+1 + end + assert(p[i] == nil) +end + + +local function f (n) + if n > 0 then f(n-1) + else coroutine.yield() end +end + +local co = coroutine.create(f) +coroutine.resume(co, 3) +checktraceback(co, {"yield", "db.lua", "db.lua", "db.lua", "db.lua"}) +checktraceback(co, {"db.lua", "db.lua", "db.lua", "db.lua"}, 1) +checktraceback(co, {"db.lua", "db.lua", "db.lua"}, 2) +checktraceback(co, {"db.lua"}, 4) +checktraceback(co, {}, 40) + + +co = coroutine.create(function (x) + local a = 1 + coroutine.yield(debug.getinfo(1, "l")) + coroutine.yield(debug.getinfo(1, "l").currentline) + return a + end) + +local tr = {} +local foo = function (e, l) if l then table.insert(tr, l) end end +debug.sethook(co, foo, "lcr") + +local _, l = coroutine.resume(co, 10) +local x = debug.getinfo(co, 1, "lfLS") +assert(x.currentline == l.currentline and x.activelines[x.currentline]) +assert(type(x.func) == "function") +for i=x.linedefined + 1, x.lastlinedefined do + assert(x.activelines[i]) + x.activelines[i] = nil +end +assert(next(x.activelines) == nil) -- no 'extra' elements +assert(not debug.getinfo(co, 2)) +local a,b = debug.getlocal(co, 1, 1) +assert(a == "x" and b == 10) +a,b = debug.getlocal(co, 1, 2) +assert(a == "a" and b == 1) +debug.setlocal(co, 1, 2, "hi") +assert(debug.gethook(co) == foo) +assert(#tr == 2 and + tr[1] == l.currentline-1 and tr[2] == l.currentline) + +a,b,c = pcall(coroutine.resume, co) +assert(a and b and c == l.currentline+1) +checktraceback(co, {"yield", "in function <"}) + +a,b = coroutine.resume(co) +assert(a and b == "hi") +assert(#tr == 4 and tr[4] == l.currentline+2) +assert(debug.gethook(co) == foo) +assert(not debug.gethook()) +checktraceback(co, {}) + + +-- check get/setlocal in coroutines +co = coroutine.create(function (x) + local a, b = coroutine.yield(x) + assert(a == 100 and b == nil) + return x +end) +a, b = coroutine.resume(co, 10) +assert(a and b == 10) +a, b = debug.getlocal(co, 1, 1) +assert(a == "x" and b == 10) +assert(not debug.getlocal(co, 1, 5)) +assert(debug.setlocal(co, 1, 1, 30) == "x") +assert(not debug.setlocal(co, 1, 5, 40)) +a, b = coroutine.resume(co, 100) +assert(a and b == 30) + + +-- check traceback of suspended (or dead with error) coroutines + +function f(i) if i==0 then error(i) else coroutine.yield(); f(i-1) end end + +co = coroutine.create(function (x) f(x) end) +a, b = coroutine.resume(co, 3) +t = {"'coroutine.yield'", "'f'", "in function <"} +while coroutine.status(co) == "suspended" do + checktraceback(co, t) + a, b = coroutine.resume(co) + table.insert(t, 2, "'f'") -- one more recursive call to 'f' +end +t[1] = "'error'" +checktraceback(co, t) + + +-- test acessing line numbers of a coroutine from a resume inside +-- a C function (this is a known bug in Lua 5.0) + +local function g(x) + coroutine.yield(x) +end + +local function f (i) + debug.sethook(function () end, "l") + for j=1,1000 do + g(i+j) + end +end + +local co = coroutine.wrap(f) +co(10) +pcall(co) +pcall(co) + + +assert(type(debug.getregistry()) == "table") + + +-- test tagmethod information +local a = {} +local function f (t) + local info = debug.getinfo(1); + assert(info.namewhat == "metamethod") + a.op = info.name + return info.name +end +setmetatable(a, { + __index = f; __add = f; __div = f; __mod = f; __concat = f; __pow = f; + __mul = f; __idiv = f; __unm = f; __len = f; __sub = f; + __shl = f; __shr = f; __bor = f; __bxor = f; + __eq = f; __le = f; __lt = f; __unm = f; __len = f; __band = f; + __bnot = f; +}) + +local b = setmetatable({}, getmetatable(a)) + +assert(a[3] == "__index" and a^3 == "__pow" and a..a == "__concat") +assert(a/3 == "__div" and 3%a == "__mod") +assert(a+3 == "__add" and 3-a == "__sub" and a*3 == "__mul" and + -a == "__unm" and #a == "__len" and a&3 == "__band") +assert(a|3 == "__bor" and 3~a == "__bxor" and a<<3 == "__shl" and + a>>1 == "__shr") +assert (a==b and a.op == "__eq") +assert (a>=b and a.op == "__le") +assert (a>b and a.op == "__lt") +assert(~a == "__bnot") + +do -- testing for-iterator name + local function f() + assert(debug.getinfo(1).name == "for iterator") + end + + for i in f do end +end + + +do -- testing debug info for finalizers + local name = nil + + -- create a piece of garbage with a finalizer + setmetatable({}, {__gc = function () + local t = debug.getinfo(2) -- get callee information + assert(t.namewhat == "metamethod") + name = t.name + end}) + + -- repeat until previous finalizer runs (setting 'name') + repeat local a = {} until name + assert(name == "__gc") +end + + +do + print("testing traceback sizes") + + local function countlines (s) + return select(2, string.gsub(s, "\n", "")) + end + + local function deep (lvl, n) + if lvl == 0 then + return (debug.traceback("message", n)) + else + return (deep(lvl-1, n)) + end + end + + local function checkdeep (total, start) + local s = deep(total, start) + local rest = string.match(s, "^message\nstack traceback:\n(.*)$") + local cl = countlines(rest) + -- at most 10 lines in first part, 11 in second, plus '...' + assert(cl <= 10 + 11 + 1) + local brk = string.find(rest, "%.%.%.") + if brk then -- does message have '...'? + local rest1 = string.sub(rest, 1, brk) + local rest2 = string.sub(rest, brk, #rest) + assert(countlines(rest1) == 10 and countlines(rest2) == 11) + else + assert(cl == total - start + 2) + end + end + + for d = 1, 51, 10 do + for l = 1, d do + -- use coroutines to ensure complete control of the stack + coroutine.wrap(checkdeep)(d, l) + end + end + +end + + +print("testing debug functions on chunk without debug info") +prog = [[-- program to be loaded without debug information +local debug = require'debug' +local a = 12 -- a local variable + +local n, v = debug.getlocal(1, 1) +assert(n == "(*temporary)" and v == debug) -- unkown name but known value +n, v = debug.getlocal(1, 2) +assert(n == "(*temporary)" and v == 12) -- unkown name but known value + +-- a function with an upvalue +local f = function () local x; return a end +n, v = debug.getupvalue(f, 1) +assert(n == "(*no name)" and v == 12) +assert(debug.setupvalue(f, 1, 13) == "(*no name)") +assert(a == 13) + +local t = debug.getinfo(f) +assert(t.name == nil and t.linedefined > 0 and + t.lastlinedefined == t.linedefined and + t.short_src == "?") +assert(debug.getinfo(1).currentline == -1) + +t = debug.getinfo(f, "L").activelines +assert(next(t) == nil) -- active lines are empty + +-- dump/load a function without debug info +f = load(string.dump(f)) + +t = debug.getinfo(f) +assert(t.name == nil and t.linedefined > 0 and + t.lastlinedefined == t.linedefined and + t.short_src == "?") +assert(debug.getinfo(1).currentline == -1) + +return a +]] + + +-- load 'prog' without debug info +local f = assert(load(string.dump(load(prog), true))) + +assert(f() == 13) + +do -- tests for 'source' in binary dumps + local prog = [[ + return function (x) + return function (y) + return x + y + end + end + ]] + local name = string.rep("x", 1000) + local p = assert(load(prog, name)) + -- load 'p' as a binary chunk with debug information + local c = string.dump(p) + assert(#c > 1000 and #c < 2000) -- no repetition of 'source' in dump + local f = assert(load(c)) + local g = f() + local h = g(3) + assert(h(5) == 8) + assert(debug.getinfo(f).source == name and -- all functions have 'source' + debug.getinfo(g).source == name and + debug.getinfo(h).source == name) + -- again, without debug info + local c = string.dump(p, true) + assert(#c < 500) -- no 'source' in dump + local f = assert(load(c)) + local g = f() + local h = g(30) + assert(h(50) == 80) + assert(debug.getinfo(f).source == '=?' and -- no function has 'source' + debug.getinfo(g).source == '=?' and + debug.getinfo(h).source == '=?') +end + +print"OK" + diff --git a/06/parser-gen/parsers/lua-5.3.4-tests/errors.lua b/06/parser-gen/parsers/lua-5.3.4-tests/errors.lua new file mode 100644 index 0000000..79d746c --- /dev/null +++ b/06/parser-gen/parsers/lua-5.3.4-tests/errors.lua @@ -0,0 +1,537 @@ +-- $Id: errors.lua,v 1.94 2016/12/21 19:23:02 roberto Exp $ +-- See Copyright Notice in file all.lua + +print("testing errors") + +local debug = require"debug" + +-- avoid problems with 'strict' module (which may generate other error messages) +local mt = getmetatable(_G) or {} +local oldmm = mt.__index +mt.__index = nil + +local function checkerr (msg, f, ...) + local st, err = pcall(f, ...) + assert(not st and string.find(err, msg)) +end + + +local function doit (s) + local f, msg = load(s) + if f == nil then return msg end + local cond, msg = pcall(f) + return (not cond) and msg +end + + +local function checkmessage (prog, msg) + local m = doit(prog) + assert(string.find(m, msg, 1, true)) +end + +local function checksyntax (prog, extra, token, line) + local msg = doit(prog) + if not string.find(token, "^<%a") and not string.find(token, "^char%(") + then token = "'"..token.."'" end + token = string.gsub(token, "(%p)", "%%%1") + local pt = string.format([[^%%[string ".*"%%]:%d: .- near %s$]], + line, token) + assert(string.find(msg, pt)) + assert(string.find(msg, msg, 1, true)) +end + + +-- test error message with no extra info +assert(doit("error('hi', 0)") == 'hi') + +-- test error message with no info +assert(doit("error()") == nil) + + +-- test common errors/errors that crashed in the past +assert(doit("table.unpack({}, 1, n=2^30)")) +assert(doit("a=math.sin()")) +assert(not doit("tostring(1)") and doit("tostring()")) +assert(doit"tonumber()") +assert(doit"repeat until 1; a") +assert(doit"return;;") +assert(doit"assert(false)") +assert(doit"assert(nil)") +assert(doit("function a (... , ...) end")) +assert(doit("function a (, ...) end")) +assert(doit("local t={}; t = t[#t] + 1")) + +checksyntax([[ + local a = {4 + +]], "'}' expected (to close '{' at line 1)", "", 3) + + +-- tests for better error messages + +checkmessage("a = {} + 1", "arithmetic") +checkmessage("a = {} | 1", "bitwise operation") +checkmessage("a = {} < 1", "attempt to compare") +checkmessage("a = {} <= 1", "attempt to compare") + +checkmessage("a=1; bbbb=2; a=math.sin(3)+bbbb(3)", "global 'bbbb'") +checkmessage("a={}; do local a=1 end a:bbbb(3)", "method 'bbbb'") +checkmessage("local a={}; a.bbbb(3)", "field 'bbbb'") +assert(not string.find(doit"a={13}; local bbbb=1; a[bbbb](3)", "'bbbb'")) +checkmessage("a={13}; local bbbb=1; a[bbbb](3)", "number") +checkmessage("a=(1)..{}", "a table value") + +checkmessage("a = #print", "length of a function value") +checkmessage("a = #3", "length of a number value") + +aaa = nil +checkmessage("aaa.bbb:ddd(9)", "global 'aaa'") +checkmessage("local aaa={bbb=1}; aaa.bbb:ddd(9)", "field 'bbb'") +checkmessage("local aaa={bbb={}}; aaa.bbb:ddd(9)", "method 'ddd'") +checkmessage("local a,b,c; (function () a = b+1 end)()", "upvalue 'b'") +assert(not doit"local aaa={bbb={ddd=next}}; aaa.bbb:ddd(nil)") + +-- upvalues being indexed do not go to the stack +checkmessage("local a,b,cc; (function () a = cc[1] end)()", "upvalue 'cc'") +checkmessage("local a,b,cc; (function () a.x = 1 end)()", "upvalue 'a'") + +checkmessage("local _ENV = {x={}}; a = a + 1", "global 'a'") + +checkmessage("b=1; local aaa='a'; x=aaa+b", "local 'aaa'") +checkmessage("aaa={}; x=3/aaa", "global 'aaa'") +checkmessage("aaa='2'; b=nil;x=aaa*b", "global 'b'") +checkmessage("aaa={}; x=-aaa", "global 'aaa'") + +-- short circuit +checkmessage("a=1; local a,bbbb=2,3; a = math.sin(1) and bbbb(3)", + "local 'bbbb'") +checkmessage("a=1; local a,bbbb=2,3; a = bbbb(1) or a(3)", "local 'bbbb'") +checkmessage("local a,b,c,f = 1,1,1; f((a and b) or c)", "local 'f'") +checkmessage("local a,b,c = 1,1,1; ((a and b) or c)()", "call a number value") +assert(not string.find(doit"aaa={}; x=(aaa or aaa)+(aaa and aaa)", "'aaa'")) +assert(not string.find(doit"aaa={}; (aaa or aaa)()", "'aaa'")) + +checkmessage("print(print < 10)", "function with number") +checkmessage("print(print < print)", "two function values") +checkmessage("print('10' < 10)", "string with number") +checkmessage("print(10 < '23')", "number with string") + +-- float->integer conversions +checkmessage("local a = 2.0^100; x = a << 2", "local a") +checkmessage("local a = 1 >> 2.0^100", "has no integer representation") +checkmessage("local a = '10' << 2.0^100", "has no integer representation") +checkmessage("local a = 2.0^100 & 1", "has no integer representation") +checkmessage("local a = 2.0^100 & '1'", "has no integer representation") +checkmessage("local a = 2.0 | 1e40", "has no integer representation") +checkmessage("local a = 2e100 ~ 1", "has no integer representation") +checkmessage("string.sub('a', 2.0^100)", "has no integer representation") +checkmessage("string.rep('a', 3.3)", "has no integer representation") +checkmessage("return 6e40 & 7", "has no integer representation") +checkmessage("return 34 << 7e30", "has no integer representation") +checkmessage("return ~-3e40", "has no integer representation") +checkmessage("return ~-3.009", "has no integer representation") +checkmessage("return 3.009 & 1", "has no integer representation") +checkmessage("return 34 >> {}", "table value") +checkmessage("a = 24 // 0", "divide by zero") +checkmessage("a = 1 % 0", "'n%0'") + + +-- passing light userdata instead of full userdata +_G.D = debug +checkmessage([[ + -- create light udata + local x = D.upvalueid(function () return debug end, 1) + D.setuservalue(x, {}) +]], "light userdata") +_G.D = nil + +do -- named objects (field '__name') + checkmessage("math.sin(io.input())", "(number expected, got FILE*)") + _G.XX = setmetatable({}, {__name = "My Type"}) + assert(string.find(tostring(XX), "^My Type")) + checkmessage("io.input(XX)", "(FILE* expected, got My Type)") + checkmessage("return XX + 1", "on a My Type value") + checkmessage("return ~io.stdin", "on a FILE* value") + checkmessage("return XX < XX", "two My Type values") + checkmessage("return {} < XX", "table with My Type") + checkmessage("return XX < io.stdin", "My Type with FILE*") + _G.XX = nil +end + +-- global functions +checkmessage("(io.write or print){}", "io.write") +checkmessage("(collectgarbage or print){}", "collectgarbage") + +-- errors in functions without debug info +do + local f = function (a) return a + 1 end + f = assert(load(string.dump(f, true))) + assert(f(3) == 4) + checkerr("^%?:%-1:", f, {}) + + -- code with a move to a local var ('OP_MOV A B' with A3+1, + {d = x and aaa[x or y]}} +]], "global 'aaa'") + +checkmessage([[ +local x,y = {},1 +if math.sin(1) == 0 then return 3 end -- return +x.a()]], "field 'a'") + +checkmessage([[ +prefix = nil +insert = nil +while 1 do + local a + if nil then break end + insert(prefix, a) +end]], "global 'insert'") + +checkmessage([[ -- tail call + return math.sin("a") +]], "'sin'") + +checkmessage([[collectgarbage("nooption")]], "invalid option") + +checkmessage([[x = print .. "a"]], "concatenate") +checkmessage([[x = "a" .. false]], "concatenate") +checkmessage([[x = {} .. 2]], "concatenate") + +checkmessage("getmetatable(io.stdin).__gc()", "no value") + +checkmessage([[ +local Var +local function main() + NoSuchName (function() Var=0 end) +end +main() +]], "global 'NoSuchName'") +print'+' + +a = {}; setmetatable(a, {__index = string}) +checkmessage("a:sub()", "bad self") +checkmessage("string.sub('a', {})", "#2") +checkmessage("('a'):sub{}", "#1") + +checkmessage("table.sort({1,2,3}, table.sort)", "'table.sort'") +checkmessage("string.gsub('s', 's', setmetatable)", "'setmetatable'") + +-- tests for errors in coroutines + +local function f (n) + local c = coroutine.create(f) + local a,b = coroutine.resume(c) + return b +end +assert(string.find(f(), "C stack overflow")) + +checkmessage("coroutine.yield()", "outside a coroutine") + +f = coroutine.wrap(function () table.sort({1,2,3}, coroutine.yield) end) +checkerr("yield across", f) + + +-- testing size of 'source' info; size of buffer for that info is +-- LUA_IDSIZE, declared as 60 in luaconf. Get one position for '\0'. +idsize = 60 - 1 +local function checksize (source) + -- syntax error + local _, msg = load("x", source) + msg = string.match(msg, "^([^:]*):") -- get source (1st part before ':') + assert(msg:len() <= idsize) +end + +for i = 60 - 10, 60 + 10 do -- check border cases around 60 + checksize("@" .. string.rep("x", i)) -- file names + checksize(string.rep("x", i - 10)) -- string sources + checksize("=" .. string.rep("x", i)) -- exact sources +end + + +-- testing line error + +local function lineerror (s, l) + local err,msg = pcall(load(s)) + local line = string.match(msg, ":(%d+):") + assert((line and line+0) == l) +end + +lineerror("local a\n for i=1,'a' do \n print(i) \n end", 2) +lineerror("\n local a \n for k,v in 3 \n do \n print(k) \n end", 3) +lineerror("\n\n for k,v in \n 3 \n do \n print(k) \n end", 4) +lineerror("function a.x.y ()\na=a+1\nend", 1) + +lineerror("a = \na\n+\n{}", 3) +lineerror("a = \n3\n+\n(\n4\n/\nprint)", 6) +lineerror("a = \nprint\n+\n(\n4\n/\n7)", 3) + +lineerror("a\n=\n-\n\nprint\n;", 3) + +lineerror([[ +a +( +23) +]], 1) + +lineerror([[ +local a = {x = 13} +a +. +x +( +23 +) +]], 2) + +lineerror([[ +local a = {x = 13} +a +. +x +( +23 + a +) +]], 6) + +local p = [[ + function g() f() end + function f(x) error('a', X) end +g() +]] +X=3;lineerror((p), 3) +X=0;lineerror((p), nil) +X=1;lineerror((p), 2) +X=2;lineerror((p), 1) + + +if not _soft then + -- several tests that exaust the Lua stack + collectgarbage() + print"testing stack overflow" + C = 0 + local l = debug.getinfo(1, "l").currentline; function y () C=C+1; y() end + + local function checkstackmessage (m) + return (string.find(m, "^.-:%d+: stack overflow")) + end + -- repeated stack overflows (to check stack recovery) + assert(checkstackmessage(doit('y()'))) + print('+') + assert(checkstackmessage(doit('y()'))) + print('+') + assert(checkstackmessage(doit('y()'))) + print('+') + + + -- error lines in stack overflow + C = 0 + local l1 + local function g(x) + l1 = debug.getinfo(x, "l").currentline; y() + end + local _, stackmsg = xpcall(g, debug.traceback, 1) + print('+') + local stack = {} + for line in string.gmatch(stackmsg, "[^\n]*") do + local curr = string.match(line, ":(%d+):") + if curr then table.insert(stack, tonumber(curr)) end + end + local i=1 + while stack[i] ~= l1 do + assert(stack[i] == l) + i = i+1 + end + assert(i > 15) + + + -- error in error handling + local res, msg = xpcall(error, error) + assert(not res and type(msg) == 'string') + print('+') + + local function f (x) + if x==0 then error('a\n') + else + local aux = function () return f(x-1) end + local a,b = xpcall(aux, aux) + return a,b + end + end + f(3) + + local function loop (x,y,z) return 1 + loop(x, y, z) end + + local res, msg = xpcall(loop, function (m) + assert(string.find(m, "stack overflow")) + checkerr("error handling", loop) + assert(math.sin(0) == 0) + return 15 + end) + assert(msg == 15) + + local f = function () + for i = 999900, 1000000, 1 do table.unpack({}, 1, i) end + end + checkerr("too many results", f) + +end + + +do + -- non string messages + local t = {} + local res, msg = pcall(function () error(t) end) + assert(not res and msg == t) + + res, msg = pcall(function () error(nil) end) + assert(not res and msg == nil) + + local function f() error{msg='x'} end + res, msg = xpcall(f, function (r) return {msg=r.msg..'y'} end) + assert(msg.msg == 'xy') + + -- 'assert' with extra arguments + res, msg = pcall(assert, false, "X", t) + assert(not res and msg == "X") + + -- 'assert' with no message + res, msg = pcall(function () assert(false) end) + local line = string.match(msg, "%w+%.lua:(%d+): assertion failed!$") + assert(tonumber(line) == debug.getinfo(1, "l").currentline - 2) + + -- 'assert' with non-string messages + res, msg = pcall(assert, false, t) + assert(not res and msg == t) + + res, msg = pcall(assert, nil, nil) + assert(not res and msg == nil) + + -- 'assert' without arguments + res, msg = pcall(assert) + assert(not res and string.find(msg, "value expected")) +end + +-- xpcall with arguments +a, b, c = xpcall(string.find, error, "alo", "al") +assert(a and b == 1 and c == 2) +a, b, c = xpcall(string.find, function (x) return {} end, true, "al") +assert(not a and type(b) == "table" and c == nil) + + +print("testing tokens in error messages") +checksyntax("syntax error", "", "error", 1) +checksyntax("1.000", "", "1.000", 1) +checksyntax("[[a]]", "", "[[a]]", 1) +checksyntax("'aa'", "", "'aa'", 1) +checksyntax("while << do end", "", "<<", 1) +checksyntax("for >> do end", "", ">>", 1) + +-- test invalid non-printable char in a chunk +checksyntax("a\1a = 1", "", "<\\1>", 1) + +-- test 255 as first char in a chunk +checksyntax("\255a = 1", "", "<\\255>", 1) + +doit('I = load("a=9+"); a=3') +assert(a==3 and I == nil) +print('+') + +lim = 1000 +if _soft then lim = 100 end +for i=1,lim do + doit('a = ') + doit('a = 4+nil') +end + + +-- testing syntax limits + +local maxClevel = 200 -- LUAI_MAXCCALLS (in llimits.h) + +local function testrep (init, rep, close, repc) + local s = init .. string.rep(rep, maxClevel - 10) .. close .. + string.rep(repc, maxClevel - 10) + assert(load(s)) -- 190 levels is OK + s = init .. string.rep(rep, maxClevel + 1) + checkmessage(s, "too many C levels") +end + +testrep("local a; a", ",a", "= 1", ",1") -- multiple assignment +testrep("local a; a=", "{", "0", "}") +testrep("local a; a=", "(", "2", ")") +testrep("local a; ", "a(", "2", ")") +testrep("", "do ", "", " end") +testrep("", "while a do ", "", " end") +testrep("local a; ", "if a then else ", "", " end") +testrep("", "function foo () ", "", " end") +testrep("local a; a=", "a..", "a", "") +testrep("local a; a=", "a^", "a", "") + +checkmessage("a = f(x" .. string.rep(",x", 260) .. ")", "too many registers") + + +-- testing other limits + +-- upvalues +local lim = 127 +local s = "local function fooA ()\n local " +for j = 1,lim do + s = s.."a"..j..", " +end +s = s.."b,c\n" +s = s.."local function fooB ()\n local " +for j = 1,lim do + s = s.."b"..j..", " +end +s = s.."b\n" +s = s.."function fooC () return b+c" +local c = 1+2 +for j = 1,lim do + s = s.."+a"..j.."+b"..j + c = c + 2 +end +s = s.."\nend end end" +local a,b = load(s) +assert(c > 255 and string.find(b, "too many upvalues") and + string.find(b, "line 5")) + +-- local variables +s = "\nfunction foo ()\n local " +for j = 1,300 do + s = s.."a"..j..", " +end +s = s.."b\n" +local a,b = load(s) +assert(string.find(b, "line 2") and string.find(b, "too many local variables")) + +mt.__index = oldmm + +print('OK') diff --git a/06/parser-gen/parsers/lua-5.3.4-tests/events.lua b/06/parser-gen/parsers/lua-5.3.4-tests/events.lua new file mode 100644 index 0000000..9136f99 --- /dev/null +++ b/06/parser-gen/parsers/lua-5.3.4-tests/events.lua @@ -0,0 +1,456 @@ +-- $Id: events.lua,v 1.45 2016/12/21 19:23:02 roberto Exp $ +-- See Copyright Notice in file all.lua + +print('testing metatables') + +local debug = require'debug' + +X = 20; B = 30 + +_ENV = setmetatable({}, {__index=_G}) + +collectgarbage() + +X = X+10 +assert(X == 30 and _G.X == 20) +B = false +assert(B == false) +B = nil +assert(B == 30) + +assert(getmetatable{} == nil) +assert(getmetatable(4) == nil) +assert(getmetatable(nil) == nil) +a={name = "NAME"}; setmetatable(a, {__metatable = "xuxu", + __tostring=function(x) return x.name end}) +assert(getmetatable(a) == "xuxu") +assert(tostring(a) == "NAME") +-- cannot change a protected metatable +assert(pcall(setmetatable, a, {}) == false) +a.name = "gororoba" +assert(tostring(a) == "gororoba") + +local a, t = {10,20,30; x="10", y="20"}, {} +assert(setmetatable(a,t) == a) +assert(getmetatable(a) == t) +assert(setmetatable(a,nil) == a) +assert(getmetatable(a) == nil) +assert(setmetatable(a,t) == a) + + +function f (t, i, e) + assert(not e) + local p = rawget(t, "parent") + return (p and p[i]+3), "dummy return" +end + +t.__index = f + +a.parent = {z=25, x=12, [4] = 24} +assert(a[1] == 10 and a.z == 28 and a[4] == 27 and a.x == "10") + +collectgarbage() + +a = setmetatable({}, t) +function f(t, i, v) rawset(t, i, v-3) end +setmetatable(t, t) -- causes a bug in 5.1 ! +t.__newindex = f +a[1] = 30; a.x = "101"; a[5] = 200 +assert(a[1] == 27 and a.x == 98 and a[5] == 197) + +do -- bug in Lua 5.3.2 + local mt = {} + mt.__newindex = mt + local t = setmetatable({}, mt) + t[1] = 10 -- will segfault on some machines + assert(mt[1] == 10) +end + + +local c = {} +a = setmetatable({}, t) +t.__newindex = c +a[1] = 10; a[2] = 20; a[3] = 90 +assert(c[1] == 10 and c[2] == 20 and c[3] == 90) + + +do + local a; + a = setmetatable({}, {__index = setmetatable({}, + {__index = setmetatable({}, + {__index = function (_,n) return a[n-3]+4, "lixo" end})})}) + a[0] = 20 + for i=0,10 do + assert(a[i*3] == 20 + i*4) + end +end + + +do -- newindex + local foi + local a = {} + for i=1,10 do a[i] = 0; a['a'..i] = 0; end + setmetatable(a, {__newindex = function (t,k,v) foi=true; rawset(t,k,v) end}) + foi = false; a[1]=0; assert(not foi) + foi = false; a['a1']=0; assert(not foi) + foi = false; a['a11']=0; assert(foi) + foi = false; a[11]=0; assert(foi) + foi = false; a[1]=nil; assert(not foi) + foi = false; a[1]=nil; assert(foi) +end + + +setmetatable(t, nil) +function f (t, ...) return t, {...} end +t.__call = f + +do + local x,y = a(table.unpack{'a', 1}) + assert(x==a and y[1]=='a' and y[2]==1 and y[3]==nil) + x,y = a() + assert(x==a and y[1]==nil) +end + + +local b = setmetatable({}, t) +setmetatable(b,t) + +function f(op) + return function (...) cap = {[0] = op, ...} ; return (...) end +end +t.__add = f("add") +t.__sub = f("sub") +t.__mul = f("mul") +t.__div = f("div") +t.__idiv = f("idiv") +t.__mod = f("mod") +t.__unm = f("unm") +t.__pow = f("pow") +t.__len = f("len") +t.__band = f("band") +t.__bor = f("bor") +t.__bxor = f("bxor") +t.__shl = f("shl") +t.__shr = f("shr") +t.__bnot = f("bnot") + +assert(b+5 == b) +assert(cap[0] == "add" and cap[1] == b and cap[2] == 5 and cap[3]==nil) +assert(b+'5' == b) +assert(cap[0] == "add" and cap[1] == b and cap[2] == '5' and cap[3]==nil) +assert(5+b == 5) +assert(cap[0] == "add" and cap[1] == 5 and cap[2] == b and cap[3]==nil) +assert('5'+b == '5') +assert(cap[0] == "add" and cap[1] == '5' and cap[2] == b and cap[3]==nil) +b=b-3; assert(getmetatable(b) == t) +assert(5-a == 5) +assert(cap[0] == "sub" and cap[1] == 5 and cap[2] == a and cap[3]==nil) +assert('5'-a == '5') +assert(cap[0] == "sub" and cap[1] == '5' and cap[2] == a and cap[3]==nil) +assert(a*a == a) +assert(cap[0] == "mul" and cap[1] == a and cap[2] == a and cap[3]==nil) +assert(a/0 == a) +assert(cap[0] == "div" and cap[1] == a and cap[2] == 0 and cap[3]==nil) +assert(a%2 == a) +assert(cap[0] == "mod" and cap[1] == a and cap[2] == 2 and cap[3]==nil) +assert(a // (1/0) == a) +assert(cap[0] == "idiv" and cap[1] == a and cap[2] == 1/0 and cap[3]==nil) +assert(a & "hi" == a) +assert(cap[0] == "band" and cap[1] == a and cap[2] == "hi" and cap[3]==nil) +assert(a | "hi" == a) +assert(cap[0] == "bor" and cap[1] == a and cap[2] == "hi" and cap[3]==nil) +assert("hi" ~ a == "hi") +assert(cap[0] == "bxor" and cap[1] == "hi" and cap[2] == a and cap[3]==nil) +assert(-a == a) +assert(cap[0] == "unm" and cap[1] == a) +assert(a^4 == a) +assert(cap[0] == "pow" and cap[1] == a and cap[2] == 4 and cap[3]==nil) +assert(a^'4' == a) +assert(cap[0] == "pow" and cap[1] == a and cap[2] == '4' and cap[3]==nil) +assert(4^a == 4) +assert(cap[0] == "pow" and cap[1] == 4 and cap[2] == a and cap[3]==nil) +assert('4'^a == '4') +assert(cap[0] == "pow" and cap[1] == '4' and cap[2] == a and cap[3]==nil) +assert(#a == a) +assert(cap[0] == "len" and cap[1] == a) +assert(~a == a) +assert(cap[0] == "bnot" and cap[1] == a) +assert(a << 3 == a) +assert(cap[0] == "shl" and cap[1] == a and cap[2] == 3) +assert(1.5 >> a == 1.5) +assert(cap[0] == "shr" and cap[1] == 1.5 and cap[2] == a) + + +-- test for rawlen +t = setmetatable({1,2,3}, {__len = function () return 10 end}) +assert(#t == 10 and rawlen(t) == 3) +assert(rawlen"abc" == 3) +assert(not pcall(rawlen, io.stdin)) +assert(not pcall(rawlen, 34)) +assert(not pcall(rawlen)) + +-- rawlen for long strings +assert(rawlen(string.rep('a', 1000)) == 1000) + + +t = {} +t.__lt = function (a,b,c) + collectgarbage() + assert(c == nil) + if type(a) == 'table' then a = a.x end + if type(b) == 'table' then b = b.x end + return aOp(1)) and not(Op(1)>Op(2)) and (Op(2)>Op(1))) + assert(not(Op('a')>Op('a')) and not(Op('a')>Op('b')) and (Op('b')>Op('a'))) + assert((Op(1)>=Op(1)) and not(Op(1)>=Op(2)) and (Op(2)>=Op(1))) + assert((1 >= Op(1)) and not(1 >= Op(2)) and (Op(2) >= 1)) + assert((Op('a')>=Op('a')) and not(Op('a')>=Op('b')) and (Op('b')>=Op('a'))) + assert(('a' >= Op('a')) and not(Op('a') >= 'b') and (Op('b') >= Op('a'))) +end + +test() + +t.__le = function (a,b,c) + assert(c == nil) + if type(a) == 'table' then a = a.x end + if type(b) == 'table' then b = b.x end + return a<=b, "dummy" +end + +test() -- retest comparisons, now using both `lt' and `le' + + +-- test `partial order' + +local function rawSet(x) + local y = {} + for _,k in pairs(x) do y[k] = 1 end + return y +end + +local function Set(x) + return setmetatable(rawSet(x), t) +end + +t.__lt = function (a,b) + for k in pairs(a) do + if not b[k] then return false end + b[k] = nil + end + return next(b) ~= nil +end + +t.__le = nil + +assert(Set{1,2,3} < Set{1,2,3,4}) +assert(not(Set{1,2,3,4} < Set{1,2,3,4})) +assert((Set{1,2,3,4} <= Set{1,2,3,4})) +assert((Set{1,2,3,4} >= Set{1,2,3,4})) +assert((Set{1,3} <= Set{3,5})) -- wrong!! model needs a `le' method ;-) + +t.__le = function (a,b) + for k in pairs(a) do + if not b[k] then return false end + end + return true +end + +assert(not (Set{1,3} <= Set{3,5})) -- now its OK! +assert(not(Set{1,3} <= Set{3,5})) +assert(not(Set{1,3} >= Set{3,5})) + +t.__eq = function (a,b) + for k in pairs(a) do + if not b[k] then return false end + b[k] = nil + end + return next(b) == nil +end + +local s = Set{1,3,5} +assert(s == Set{3,5,1}) +assert(not rawequal(s, Set{3,5,1})) +assert(rawequal(s, s)) +assert(Set{1,3,5,1} == rawSet{3,5,1}) +assert(rawSet{1,3,5,1} == Set{3,5,1}) +assert(Set{1,3,5} ~= Set{3,5,1,6}) + +-- '__eq' is not used for table accesses +t[Set{1,3,5}] = 1 +assert(t[Set{1,3,5}] == nil) + + +if not T then + (Message or print)('\n >>> testC not active: skipping tests for \z +userdata equality <<<\n') +else + local u1 = T.newuserdata(0) + local u2 = T.newuserdata(0) + local u3 = T.newuserdata(0) + assert(u1 ~= u2 and u1 ~= u3) + debug.setuservalue(u1, 1); + debug.setuservalue(u2, 2); + debug.setuservalue(u3, 1); + debug.setmetatable(u1, {__eq = function (a, b) + return debug.getuservalue(a) == debug.getuservalue(b) + end}) + debug.setmetatable(u2, {__eq = function (a, b) + return true + end}) + assert(u1 == u3 and u3 == u1 and u1 ~= u2) + assert(u2 == u1 and u2 == u3 and u3 == u2) + assert(u2 ~= {}) -- different types cannot be equal +end + + +t.__concat = function (a,b,c) + assert(c == nil) + if type(a) == 'table' then a = a.val end + if type(b) == 'table' then b = b.val end + if A then return a..b + else + return setmetatable({val=a..b}, t) + end +end + +c = {val="c"}; setmetatable(c, t) +d = {val="d"}; setmetatable(d, t) + +A = true +assert(c..d == 'cd') +assert(0 .."a".."b"..c..d.."e".."f"..(5+3).."g" == "0abcdef8g") + +A = false +assert((c..d..c..d).val == 'cdcd') +x = c..d +assert(getmetatable(x) == t and x.val == 'cd') +x = 0 .."a".."b"..c..d.."e".."f".."g" +assert(x.val == "0abcdefg") + + +-- concat metamethod x numbers (bug in 5.1.1) +c = {} +local x +setmetatable(c, {__concat = function (a,b) + assert(type(a) == "number" and b == c or type(b) == "number" and a == c) + return c +end}) +assert(c..5 == c and 5 .. c == c) +assert(4 .. c .. 5 == c and 4 .. 5 .. 6 .. 7 .. c == c) + + +-- test comparison compatibilities +local t1, t2, c, d +t1 = {}; c = {}; setmetatable(c, t1) +d = {} +t1.__eq = function () return true end +t1.__lt = function () return true end +setmetatable(d, t1) +assert(c == d and c < d and not(d <= c)) +t2 = {} +t2.__eq = t1.__eq +t2.__lt = t1.__lt +setmetatable(d, t2) +assert(c == d and c < d and not(d <= c)) + + + +-- test for several levels of calls +local i +local tt = { + __call = function (t, ...) + i = i+1 + if t.f then return t.f(...) + else return {...} + end + end +} + +local a = setmetatable({}, tt) +local b = setmetatable({f=a}, tt) +local c = setmetatable({f=b}, tt) + +i = 0 +x = c(3,4,5) +assert(i == 3 and x[1] == 3 and x[3] == 5) + + +assert(_G.X == 20) + +print'+' + +local _g = _G +_ENV = setmetatable({}, {__index=function (_,k) return _g[k] end}) + + +a = {} +rawset(a, "x", 1, 2, 3) +assert(a.x == 1 and rawget(a, "x", 3) == 1) + +print '+' + +-- testing metatables for basic types +mt = {__index = function (a,b) return a+b end, + __len = function (x) return math.floor(x) end} +debug.setmetatable(10, mt) +assert(getmetatable(-2) == mt) +assert((10)[3] == 13) +assert((10)["3"] == 13) +assert(#3.45 == 3) +debug.setmetatable(23, nil) +assert(getmetatable(-2) == nil) + +debug.setmetatable(true, mt) +assert(getmetatable(false) == mt) +mt.__index = function (a,b) return a or b end +assert((true)[false] == true) +assert((false)[false] == false) +debug.setmetatable(false, nil) +assert(getmetatable(true) == nil) + +debug.setmetatable(nil, mt) +assert(getmetatable(nil) == mt) +mt.__add = function (a,b) return (a or 0) + (b or 0) end +assert(10 + nil == 10) +assert(nil + 23 == 23) +assert(nil + nil == 0) +debug.setmetatable(nil, nil) +assert(getmetatable(nil) == nil) + +debug.setmetatable(nil, {}) + + +-- loops in delegation +a = {}; setmetatable(a, a); a.__index = a; a.__newindex = a +assert(not pcall(function (a,b) return a[b] end, a, 10)) +assert(not pcall(function (a,b,c) a[b] = c end, a, 10, true)) + +-- bug in 5.1 +T, K, V = nil +grandparent = {} +grandparent.__newindex = function(t,k,v) T=t; K=k; V=v end + +parent = {} +parent.__newindex = parent +setmetatable(parent, grandparent) + +child = setmetatable({}, parent) +child.foo = 10 --> CRASH (on some machines) +assert(T == parent and K == "foo" and V == 10) + +print 'OK' + +return 12 + + diff --git a/06/parser-gen/parsers/lua-5.3.4-tests/files.lua b/06/parser-gen/parsers/lua-5.3.4-tests/files.lua new file mode 100644 index 0000000..3cfe12d --- /dev/null +++ b/06/parser-gen/parsers/lua-5.3.4-tests/files.lua @@ -0,0 +1,793 @@ +-- $Id: files.lua,v 1.95 2016/11/07 13:11:28 roberto Exp $ +-- See Copyright Notice in file all.lua + +local debug = require "debug" + +local maxint = math.maxinteger + +assert(type(os.getenv"PATH") == "string") + +assert(io.input(io.stdin) == io.stdin) +assert(not pcall(io.input, "non-existent-file")) +assert(io.output(io.stdout) == io.stdout) + + +local function testerr (msg, f, ...) + local stat, err = pcall(f, ...) + return (not stat and string.find(err, msg, 1, true)) +end + + +local function checkerr (msg, f, ...) + assert(testerr(msg, f, ...)) +end + + +-- cannot close standard files +assert(not io.close(io.stdin) and + not io.stdout:close() and + not io.stderr:close()) + + +assert(type(io.input()) == "userdata" and io.type(io.output()) == "file") +assert(type(io.stdin) == "userdata" and io.type(io.stderr) == "file") +assert(not io.type(8)) +local a = {}; setmetatable(a, {}) +assert(not io.type(a)) + +assert(getmetatable(io.input()).__name == "FILE*") + +local a,b,c = io.open('xuxu_nao_existe') +assert(not a and type(b) == "string" and type(c) == "number") + +a,b,c = io.open('/a/b/c/d', 'w') +assert(not a and type(b) == "string" and type(c) == "number") + +local file = os.tmpname() +local f, msg = io.open(file, "w") +if not f then + (Message or print)("'os.tmpname' file cannot be open; skipping file tests") + +else --{ most tests here need tmpname +f:close() + +print('testing i/o') + +local otherfile = os.tmpname() + +checkerr("invalid mode", io.open, file, "rw") +checkerr("invalid mode", io.open, file, "rb+") +checkerr("invalid mode", io.open, file, "r+bk") +checkerr("invalid mode", io.open, file, "") +checkerr("invalid mode", io.open, file, "+") +checkerr("invalid mode", io.open, file, "b") +assert(io.open(file, "r+b")):close() +assert(io.open(file, "r+")):close() +assert(io.open(file, "rb")):close() + +assert(os.setlocale('C', 'all')) + +io.input(io.stdin); io.output(io.stdout); + +os.remove(file) +assert(not loadfile(file)) +checkerr("", dofile, file) +assert(not io.open(file)) +io.output(file) +assert(io.output() ~= io.stdout) + +if not _port then -- invalid seek + local status, msg, code = io.stdin:seek("set", 1000) + assert(not status and type(msg) == "string" and type(code) == "number") +end + +assert(io.output():seek() == 0) +assert(io.write("alo alo"):seek() == string.len("alo alo")) +assert(io.output():seek("cur", -3) == string.len("alo alo")-3) +assert(io.write("joao")) +assert(io.output():seek("end") == string.len("alo joao")) + +assert(io.output():seek("set") == 0) + +assert(io.write('"lo"', "{a}\n", "second line\n", "third line \n")) +assert(io.write('fourth_line')) +io.output(io.stdout) +collectgarbage() -- file should be closed by GC +assert(io.input() == io.stdin and rawequal(io.output(), io.stdout)) +print('+') + +-- test GC for files +collectgarbage() +for i=1,120 do + for i=1,5 do + io.input(file) + assert(io.open(file, 'r')) + io.lines(file) + end + collectgarbage() +end + +io.input():close() +io.close() + +assert(os.rename(file, otherfile)) +assert(not os.rename(file, otherfile)) + +io.output(io.open(otherfile, "ab")) +assert(io.write("\n\n\t\t ", 3450, "\n")); +io.close() + +-- test writing/reading numbers +f = assert(io.open(file, "w")) +f:write(maxint, '\n') +f:write(string.format("0X%x\n", maxint)) +f:write("0xABCp-3", '\n') +f:write(0, '\n') +f:write(-maxint, '\n') +f:write(string.format("0x%X\n", -maxint)) +f:write("-0xABCp-3", '\n') +assert(f:close()) +f = assert(io.open(file, "r")) +assert(f:read("n") == maxint) +assert(f:read("n") == maxint) +assert(f:read("n") == 0xABCp-3) +assert(f:read("n") == 0) +assert(f:read("*n") == -maxint) -- test old format (with '*') +assert(f:read("n") == -maxint) +assert(f:read("*n") == -0xABCp-3) -- test old format (with '*') +assert(f:close()) +assert(os.remove(file)) + +-- test yielding during 'dofile' +f = assert(io.open(file, "w")) +f:write[[ +local x, z = coroutine.yield(10) +local y = coroutine.yield(20) +return x + y * z +]] +assert(f:close()) +f = coroutine.wrap(dofile) +assert(f(file) == 10) +print(f(100, 101) == 20) +assert(f(200) == 100 + 200 * 101) +assert(os.remove(file)) + + +f = assert(io.open(file, "w")) +-- test number termination +f:write[[ +-12.3- -0xffff+ .3|5.E-3X +234e+13E 0xDEADBEEFDEADBEEFx +0x1.13Ap+3e +]] +-- very long number +f:write("1234"); for i = 1, 1000 do f:write("0") end; f:write("\n") +-- invalid sequences (must read and discard valid prefixes) +f:write[[ +.e+ 0.e; --; 0xX; +]] +assert(f:close()) +f = assert(io.open(file, "r")) +assert(f:read("n") == -12.3); assert(f:read(1) == "-") +assert(f:read("n") == -0xffff); assert(f:read(2) == "+ ") +assert(f:read("n") == 0.3); assert(f:read(1) == "|") +assert(f:read("n") == 5e-3); assert(f:read(1) == "X") +assert(f:read("n") == 234e13); assert(f:read(1) == "E") +assert(f:read("n") == 0Xdeadbeefdeadbeef); assert(f:read(2) == "x\n") +assert(f:read("n") == 0x1.13aP3); assert(f:read(1) == "e") + +do -- attempt to read too long number + assert(f:read("n") == nil) -- fails + local s = f:read("L") -- read rest of line + assert(string.find(s, "^00*\n$")) -- lots of 0's left +end + +assert(not f:read("n")); assert(f:read(2) == "e+") +assert(not f:read("n")); assert(f:read(1) == ";") +assert(not f:read("n")); assert(f:read(2) == "-;") +assert(not f:read("n")); assert(f:read(1) == "X") +assert(not f:read("n")); assert(f:read(1) == ";") +assert(not f:read("n")); assert(not f:read(0)) -- end of file +assert(f:close()) +assert(os.remove(file)) + + +-- test line generators +assert(not pcall(io.lines, "non-existent-file")) +assert(os.rename(otherfile, file)) +io.output(otherfile) +local n = 0 +local f = io.lines(file) +while f() do n = n + 1 end; +assert(n == 6) -- number of lines in the file +checkerr("file is already closed", f) +checkerr("file is already closed", f) +-- copy from file to otherfile +n = 0 +for l in io.lines(file) do io.write(l, "\n"); n = n + 1 end +io.close() +assert(n == 6) +-- copy from otherfile back to file +local f = assert(io.open(otherfile)) +assert(io.type(f) == "file") +io.output(file) +assert(not io.output():read()) +n = 0 +for l in f:lines() do io.write(l, "\n"); n = n + 1 end +assert(tostring(f):sub(1, 5) == "file ") +assert(f:close()); io.close() +assert(n == 6) +checkerr("closed file", io.close, f) +assert(tostring(f) == "file (closed)") +assert(io.type(f) == "closed file") +io.input(file) +f = io.open(otherfile):lines() +n = 0 +for l in io.lines() do assert(l == f()); n = n + 1 end +f = nil; collectgarbage() +assert(n == 6) +assert(os.remove(otherfile)) + +do -- bug in 5.3.1 + io.output(otherfile) + io.write(string.rep("a", 300), "\n") + io.close() + local t ={}; for i = 1, 250 do t[i] = 1 end + t = {io.lines(otherfile, table.unpack(t))()} + -- everything ok here + assert(#t == 250 and t[1] == 'a' and t[#t] == 'a') + t[#t + 1] = 1 -- one too many + checkerr("too many arguments", io.lines, otherfile, table.unpack(t)) + collectgarbage() -- ensure 'otherfile' is closed + assert(os.remove(otherfile)) +end + +io.input(file) +do -- test error returns + local a,b,c = io.input():write("xuxu") + assert(not a and type(b) == "string" and type(c) == "number") +end +checkerr("invalid format", io.read, "x") +assert(io.read(0) == "") -- not eof +assert(io.read(5, 'l') == '"lo"') +assert(io.read(0) == "") +assert(io.read() == "second line") +local x = io.input():seek() +assert(io.read() == "third line ") +assert(io.input():seek("set", x)) +assert(io.read('L') == "third line \n") +assert(io.read(1) == "") +assert(io.read(string.len"fourth_line") == "fourth_line") +assert(io.input():seek("cur", -string.len"fourth_line")) +assert(io.read() == "fourth_line") +assert(io.read() == "") -- empty line +assert(io.read('n') == 3450) +assert(io.read(1) == '\n') +assert(io.read(0) == nil) -- end of file +assert(io.read(1) == nil) -- end of file +assert(io.read(30000) == nil) -- end of file +assert(({io.read(1)})[2] == nil) +assert(io.read() == nil) -- end of file +assert(({io.read()})[2] == nil) +assert(io.read('n') == nil) -- end of file +assert(({io.read('n')})[2] == nil) +assert(io.read('a') == '') -- end of file (OK for 'a') +assert(io.read('a') == '') -- end of file (OK for 'a') +collectgarbage() +print('+') +io.close(io.input()) +checkerr(" input file is closed", io.read) + +assert(os.remove(file)) + +local t = '0123456789' +for i=1,10 do t = t..t; end +assert(string.len(t) == 10*2^10) + +io.output(file) +io.write("alo"):write("\n") +io.close() +checkerr(" output file is closed", io.write) +local f = io.open(file, "a+b") +io.output(f) +collectgarbage() + +assert(io.write(' ' .. t .. ' ')) +assert(io.write(';', 'end of file\n')) +f:flush(); io.flush() +f:close() +print('+') + +io.input(file) +assert(io.read() == "alo") +assert(io.read(1) == ' ') +assert(io.read(string.len(t)) == t) +assert(io.read(1) == ' ') +assert(io.read(0)) +assert(io.read('a') == ';end of file\n') +assert(io.read(0) == nil) +assert(io.close(io.input())) + + +-- test errors in read/write +do + local function ismsg (m) + -- error message is not a code number + return (type(m) == "string" and tonumber(m) == nil) + end + + -- read + local f = io.open(file, "w") + local r, m, c = f:read() + assert(not r and ismsg(m) and type(c) == "number") + assert(f:close()) + -- write + f = io.open(file, "r") + r, m, c = f:write("whatever") + assert(not r and ismsg(m) and type(c) == "number") + assert(f:close()) + -- lines + f = io.open(file, "w") + r, m = pcall(f:lines()) + assert(r == false and ismsg(m)) + assert(f:close()) +end + +assert(os.remove(file)) + +-- test for L format +io.output(file); io.write"\n\nline\nother":close() +io.input(file) +assert(io.read"L" == "\n") +assert(io.read"L" == "\n") +assert(io.read"L" == "line\n") +assert(io.read"L" == "other") +assert(io.read"L" == nil) +io.input():close() + +local f = assert(io.open(file)) +local s = "" +for l in f:lines("L") do s = s .. l end +assert(s == "\n\nline\nother") +f:close() + +io.input(file) +s = "" +for l in io.lines(nil, "L") do s = s .. l end +assert(s == "\n\nline\nother") +io.input():close() + +s = "" +for l in io.lines(file, "L") do s = s .. l end +assert(s == "\n\nline\nother") + +s = "" +for l in io.lines(file, "l") do s = s .. l end +assert(s == "lineother") + +io.output(file); io.write"a = 10 + 34\na = 2*a\na = -a\n":close() +local t = {} +load(io.lines(file, "L"), nil, nil, t)() +assert(t.a == -((10 + 34) * 2)) + + +-- test for multipe arguments in 'lines' +io.output(file); io.write"0123456789\n":close() +for a,b in io.lines(file, 1, 1) do + if a == "\n" then assert(b == nil) + else assert(tonumber(a) == tonumber(b) - 1) + end +end + +for a,b,c in io.lines(file, 1, 2, "a") do + assert(a == "0" and b == "12" and c == "3456789\n") +end + +for a,b,c in io.lines(file, "a", 0, 1) do + if a == "" then break end + assert(a == "0123456789\n" and b == nil and c == nil) +end +collectgarbage() -- to close file in previous iteration + +io.output(file); io.write"00\n10\n20\n30\n40\n":close() +for a, b in io.lines(file, "n", "n") do + if a == 40 then assert(b == nil) + else assert(a == b - 10) + end +end + + +-- test load x lines +io.output(file); +io.write[[ +local y += X +X = +X * +2 + +X; +X = +X +- y; +]]:close() +_G.X = 1 +assert(not load(io.lines(file))) +collectgarbage() -- to close file in previous iteration +load(io.lines(file, "L"))() +assert(_G.X == 2) +load(io.lines(file, 1))() +assert(_G.X == 4) +load(io.lines(file, 3))() +assert(_G.X == 8) + +print('+') + +local x1 = "string\n\n\\com \"\"''coisas [[estranhas]] ]]'" +io.output(file) +assert(io.write(string.format("x2 = %q\n-- comment without ending EOS", x1))) +io.close() +assert(loadfile(file))() +assert(x1 == x2) +print('+') +assert(os.remove(file)) +assert(not os.remove(file)) +assert(not os.remove(otherfile)) + +-- testing loadfile +local function testloadfile (s, expres) + io.output(file) + if s then io.write(s) end + io.close() + local res = assert(loadfile(file))() + assert(os.remove(file)) + assert(res == expres) +end + +-- loading empty file +testloadfile(nil, nil) + +-- loading file with initial comment without end of line +testloadfile("# a non-ending comment", nil) + + +-- checking Unicode BOM in files +testloadfile("\xEF\xBB\xBF# some comment\nreturn 234", 234) +testloadfile("\xEF\xBB\xBFreturn 239", 239) +testloadfile("\xEF\xBB\xBF", nil) -- empty file with a BOM + + +-- checking line numbers in files with initial comments +testloadfile("# a comment\nreturn require'debug'.getinfo(1).currentline", 2) + + +-- loading binary file +io.output(io.open(file, "wb")) +assert(io.write(string.dump(function () return 10, '\0alo\255', 'hi' end))) +io.close() +a, b, c = assert(loadfile(file))() +assert(a == 10 and b == "\0alo\255" and c == "hi") +assert(os.remove(file)) + +-- bug in 5.2.1 +do + io.output(io.open(file, "wb")) + -- save function with no upvalues + assert(io.write(string.dump(function () return 1 end))) + io.close() + f = assert(loadfile(file, "b", {})) + assert(type(f) == "function" and f() == 1) + assert(os.remove(file)) +end + +-- loading binary file with initial comment +io.output(io.open(file, "wb")) +assert(io.write("#this is a comment for a binary file\0\n", + string.dump(function () return 20, '\0\0\0' end))) +io.close() +a, b, c = assert(loadfile(file))() +assert(a == 20 and b == "\0\0\0" and c == nil) +assert(os.remove(file)) + + +-- 'loadfile' with 'env' +do + local f = io.open(file, 'w') + f:write[[ + if (...) then a = 15; return b, c, d + else return _ENV + end + ]] + f:close() + local t = {b = 12, c = "xuxu", d = print} + local f = assert(loadfile(file, 't', t)) + local b, c, d = f(1) + assert(t.a == 15 and b == 12 and c == t.c and d == print) + assert(f() == t) + f = assert(loadfile(file, 't', nil)) + assert(f() == nil) + f = assert(loadfile(file)) + assert(f() == _G) + assert(os.remove(file)) +end + + +-- 'loadfile' x modes +do + io.open(file, 'w'):write("return 10"):close() + local s, m = loadfile(file, 'b') + assert(not s and string.find(m, "a text chunk")) + io.open(file, 'w'):write("\27 return 10"):close() + local s, m = loadfile(file, 't') + assert(not s and string.find(m, "a binary chunk")) + assert(os.remove(file)) +end + + +io.output(file) +assert(io.write("qualquer coisa\n")) +assert(io.write("mais qualquer coisa")) +io.close() +assert(io.output(assert(io.open(otherfile, 'wb'))) + :write("outra coisa\0\1\3\0\0\0\0\255\0") + :close()) + +local filehandle = assert(io.open(file, 'r+')) +local otherfilehandle = assert(io.open(otherfile, 'rb')) +assert(filehandle ~= otherfilehandle) +assert(type(filehandle) == "userdata") +assert(filehandle:read('l') == "qualquer coisa") +io.input(otherfilehandle) +assert(io.read(string.len"outra coisa") == "outra coisa") +assert(filehandle:read('l') == "mais qualquer coisa") +filehandle:close(); +assert(type(filehandle) == "userdata") +io.input(otherfilehandle) +assert(io.read(4) == "\0\1\3\0") +assert(io.read(3) == "\0\0\0") +assert(io.read(0) == "") -- 255 is not eof +assert(io.read(1) == "\255") +assert(io.read('a') == "\0") +assert(not io.read(0)) +assert(otherfilehandle == io.input()) +otherfilehandle:close() +assert(os.remove(file)) +assert(os.remove(otherfile)) +collectgarbage() + +io.output(file) + :write[[ + 123.4 -56e-2 not a number +second line +third line + +and the rest of the file +]] + :close() +io.input(file) +local _,a,b,c,d,e,h,__ = io.read(1, 'n', 'n', 'l', 'l', 'l', 'a', 10) +assert(io.close(io.input())) +assert(_ == ' ' and __ == nil) +assert(type(a) == 'number' and a==123.4 and b==-56e-2) +assert(d=='second line' and e=='third line') +assert(h==[[ + +and the rest of the file +]]) +assert(os.remove(file)) +collectgarbage() + +-- testing buffers +do + local f = assert(io.open(file, "w")) + local fr = assert(io.open(file, "r")) + assert(f:setvbuf("full", 2000)) + f:write("x") + assert(fr:read("all") == "") -- full buffer; output not written yet + f:close() + fr:seek("set") + assert(fr:read("all") == "x") -- `close' flushes it + f = assert(io.open(file), "w") + assert(f:setvbuf("no")) + f:write("x") + fr:seek("set") + assert(fr:read("all") == "x") -- no buffer; output is ready + f:close() + f = assert(io.open(file, "a")) + assert(f:setvbuf("line")) + f:write("x") + fr:seek("set", 1) + assert(fr:read("all") == "") -- line buffer; no output without `\n' + f:write("a\n"):seek("set", 1) + assert(fr:read("all") == "xa\n") -- now we have a whole line + f:close(); fr:close() + assert(os.remove(file)) +end + + +if not _soft then + print("testing large files (> BUFSIZ)") + io.output(file) + for i=1,5001 do io.write('0123456789123') end + io.write('\n12346'):close() + io.input(file) + local x = io.read('a') + io.input():seek('set', 0) + local y = io.read(30001)..io.read(1005)..io.read(0).. + io.read(1)..io.read(100003) + assert(x == y and string.len(x) == 5001*13 + 6) + io.input():seek('set', 0) + y = io.read() -- huge line + assert(x == y..'\n'..io.read()) + assert(io.read() == nil) + io.close(io.input()) + assert(os.remove(file)) + x = nil; y = nil +end + +if not _port then + local progname + do -- get name of running executable + local arg = arg or _ARG + local i = 0 + while arg[i] do i = i - 1 end + progname = '"' .. arg[i + 1] .. '"' + end + print("testing popen/pclose and execute") + local tests = { + -- command, what, code + {"ls > /dev/null", "ok"}, + {"not-to-be-found-command", "exit"}, + {"exit 3", "exit", 3}, + {"exit 129", "exit", 129}, + {"kill -s HUP $$", "signal", 1}, + {"kill -s KILL $$", "signal", 9}, + {"sh -c 'kill -s HUP $$'", "exit"}, + {progname .. ' -e " "', "ok"}, + {progname .. ' -e "os.exit(0, true)"', "ok"}, + {progname .. ' -e "os.exit(20, true)"', "exit", 20}, + } + print("\n(some error messages are expected now)") + for _, v in ipairs(tests) do + local x, y, z = io.popen(v[1]):close() + local x1, y1, z1 = os.execute(v[1]) + assert(x == x1 and y == y1 and z == z1) + if v[2] == "ok" then + assert(x and y == 'exit' and z == 0) + else + assert(not x and y == v[2]) -- correct status and 'what' + -- correct code if known (but always different from 0) + assert((v[3] == nil and z > 0) or v[3] == z) + end + end +end + + +-- testing tmpfile +f = io.tmpfile() +assert(io.type(f) == "file") +f:write("alo") +f:seek("set") +assert(f:read"a" == "alo") + +end --} + +print'+' + +print("testing date/time") + +assert(os.date("") == "") +assert(os.date("!") == "") +assert(os.date("\0\0") == "\0\0") +assert(os.date("!\0\0") == "\0\0") +local x = string.rep("a", 10000) +assert(os.date(x) == x) +local t = os.time() +D = os.date("*t", t) +assert(os.date(string.rep("%d", 1000), t) == + string.rep(os.date("%d", t), 1000)) +assert(os.date(string.rep("%", 200)) == string.rep("%", 100)) + +local t = os.time() +D = os.date("*t", t) +load(os.date([[assert(D.year==%Y and D.month==%m and D.day==%d and + D.hour==%H and D.min==%M and D.sec==%S and + D.wday==%w+1 and D.yday==%j and type(D.isdst) == 'boolean')]], t))() + +checkerr("invalid conversion specifier", os.date, "%") +checkerr("invalid conversion specifier", os.date, "%9") +checkerr("invalid conversion specifier", os.date, "%") +checkerr("invalid conversion specifier", os.date, "%O") +checkerr("invalid conversion specifier", os.date, "%E") +checkerr("invalid conversion specifier", os.date, "%Ea") + +checkerr("not an integer", os.time, {year=1000, month=1, day=1, hour='x'}) +checkerr("not an integer", os.time, {year=1000, month=1, day=1, hour=1.5}) + +checkerr("missing", os.time, {hour = 12}) -- missing date + +if not _port then + -- test Posix-specific modifiers + assert(type(os.date("%Ex")) == 'string') + assert(type(os.date("%Oy")) == 'string') + + + -- test out-of-range dates (at least for Unix) + if maxint >= 2^62 then -- cannot do these tests in Small Lua + -- no arith overflows + checkerr("out-of-bound", os.time, {year = -maxint, month = 1, day = 1}) + if string.packsize("i") == 4 then -- 4-byte ints + if testerr("out-of-bound", os.date, "%Y", 2^40) then + -- time_t has 4 bytes and therefore cannot represent year 4000 + print(" 4-byte time_t") + checkerr("cannot be represented", os.time, {year=4000, month=1, day=1}) + else + -- time_t has 8 bytes; an int year cannot represent a huge time + print(" 8-byte time_t") + checkerr("cannot be represented", os.date, "%Y", 2^60) + -- it should have no problems with year 4000 + assert(tonumber(os.time{year=4000, month=1, day=1})) + end + else -- 8-byte ints + -- assume time_t has 8 bytes too + print(" 8-byte time_t") + assert(tonumber(os.date("%Y", 2^60))) + -- but still cannot represent a huge year + checkerr("cannot be represented", os.time, {year=2^60, month=1, day=1}) + end + end +end + + +D = os.date("!*t", t) +load(os.date([[!assert(D.year==%Y and D.month==%m and D.day==%d and + D.hour==%H and D.min==%M and D.sec==%S and + D.wday==%w+1 and D.yday==%j and type(D.isdst) == 'boolean')]], t))() + +do + local D = os.date("*t") + local t = os.time(D) + assert(type(D.isdst) == 'boolean') + D.isdst = nil + local t1 = os.time(D) + assert(t == t1) -- if isdst is absent uses correct default +end + +t = os.time(D) +D.year = D.year-1; +local t1 = os.time(D) +-- allow for leap years +assert(math.abs(os.difftime(t,t1)/(24*3600) - 365) < 2) + +-- should not take more than 1 second to execute these two lines +t = os.time() +t1 = os.time(os.date("*t")) +local diff = os.difftime(t1,t) +assert(0 <= diff and diff <= 1) +diff = os.difftime(t,t1) +assert(-1 <= diff and diff <= 0) + +local t1 = os.time{year=2000, month=10, day=1, hour=23, min=12} +local t2 = os.time{year=2000, month=10, day=1, hour=23, min=10, sec=19} +assert(os.difftime(t1,t2) == 60*2-19) + +-- since 5.3.3, 'os.time' normalizes table fields +t1 = {year = 2005, month = 1, day = 1, hour = 1, min = 0, sec = -3602} +os.time(t1) +assert(t1.day == 31 and t1.month == 12 and t1.year == 2004 and + t1.hour == 23 and t1.min == 59 and t1.sec == 58 and + t1.yday == 366) + +io.output(io.stdout) +local t = os.date('%d %m %Y %H %M %S') +local d, m, a, h, min, s = string.match(t, + "(%d+) (%d+) (%d+) (%d+) (%d+) (%d+)") +d = tonumber(d) +m = tonumber(m) +a = tonumber(a) +h = tonumber(h) +min = tonumber(min) +s = tonumber(s) +io.write(string.format('test done on %2.2d/%2.2d/%d', d, m, a)) +io.write(string.format(', at %2.2d:%2.2d:%2.2d\n', h, min, s)) +io.write(string.format('%s\n', _VERSION)) + + diff --git a/06/parser-gen/parsers/lua-5.3.4-tests/gc.lua b/06/parser-gen/parsers/lua-5.3.4-tests/gc.lua new file mode 100644 index 0000000..93fd6d6 --- /dev/null +++ b/06/parser-gen/parsers/lua-5.3.4-tests/gc.lua @@ -0,0 +1,624 @@ +-- $Id: gc.lua,v 1.72 2016/11/07 13:11:28 roberto Exp $ +-- See Copyright Notice in file all.lua + +print('testing garbage collection') + +local debug = require"debug" + +collectgarbage() + +assert(collectgarbage("isrunning")) + +local function gcinfo () return collectgarbage"count" * 1024 end + + +-- test weird parameters +do + -- save original parameters + local a = collectgarbage("setpause", 200) + local b = collectgarbage("setstepmul", 200) + local t = {0, 2, 10, 90, 500, 5000, 30000, 0x7ffffffe} + for i = 1, #t do + local p = t[i] + for j = 1, #t do + local m = t[j] + collectgarbage("setpause", p) + collectgarbage("setstepmul", m) + collectgarbage("step", 0) + collectgarbage("step", 10000) + end + end + -- restore original parameters + collectgarbage("setpause", a) + collectgarbage("setstepmul", b) + collectgarbage() +end + + +_G["while"] = 234 + +limit = 5000 + + +local function GC1 () + local u + local b -- must be declared after 'u' (to be above it in the stack) + local finish = false + u = setmetatable({}, {__gc = function () finish = true end}) + b = {34} + repeat u = {} until finish + assert(b[1] == 34) -- 'u' was collected, but 'b' was not + + finish = false; local i = 1 + u = setmetatable({}, {__gc = function () finish = true end}) + repeat i = i + 1; u = tostring(i) .. tostring(i) until finish + assert(b[1] == 34) -- 'u' was collected, but 'b' was not + + finish = false + u = setmetatable({}, {__gc = function () finish = true end}) + repeat local i; u = function () return i end until finish + assert(b[1] == 34) -- 'u' was collected, but 'b' was not +end + +local function GC2 () + local u + local finish = false + u = {setmetatable({}, {__gc = function () finish = true end})} + b = {34} + repeat u = {{}} until finish + assert(b[1] == 34) -- 'u' was collected, but 'b' was not + + finish = false; local i = 1 + u = {setmetatable({}, {__gc = function () finish = true end})} + repeat i = i + 1; u = {tostring(i) .. tostring(i)} until finish + assert(b[1] == 34) -- 'u' was collected, but 'b' was not + + finish = false + u = {setmetatable({}, {__gc = function () finish = true end})} + repeat local i; u = {function () return i end} until finish + assert(b[1] == 34) -- 'u' was collected, but 'b' was not +end + +local function GC() GC1(); GC2() end + + +contCreate = 0 + +print('tables') +while contCreate <= limit do + local a = {}; a = nil + contCreate = contCreate+1 +end + +a = "a" + +contCreate = 0 +print('strings') +while contCreate <= limit do + a = contCreate .. "b"; + a = string.gsub(a, '(%d%d*)', string.upper) + a = "a" + contCreate = contCreate+1 +end + + +contCreate = 0 + +a = {} + +print('functions') +function a:test () + while contCreate <= limit do + load(string.format("function temp(a) return 'a%d' end", contCreate), "")() + assert(temp() == string.format('a%d', contCreate)) + contCreate = contCreate+1 + end +end + +a:test() + +-- collection of functions without locals, globals, etc. +do local f = function () end end + + +print("functions with errors") +prog = [[ +do + a = 10; + function foo(x,y) + a = sin(a+0.456-0.23e-12); + return function (z) return sin(%x+z) end + end + local x = function (w) a=a+w; end +end +]] +do + local step = 1 + if _soft then step = 13 end + for i=1, string.len(prog), step do + for j=i, string.len(prog), step do + pcall(load(string.sub(prog, i, j), "")) + end + end +end + +foo = nil +print('long strings') +x = "01234567890123456789012345678901234567890123456789012345678901234567890123456789" +assert(string.len(x)==80) +s = '' +n = 0 +k = math.min(300, (math.maxinteger // 80) // 2) +while n < k do s = s..x; n=n+1; j=tostring(n) end +assert(string.len(s) == k*80) +s = string.sub(s, 1, 10000) +s, i = string.gsub(s, '(%d%d%d%d)', '') +assert(i==10000 // 4) +s = nil +x = nil + +assert(_G["while"] == 234) + + +print("steps") + +print("steps (2)") + +local function dosteps (siz) + assert(not collectgarbage("isrunning")) + collectgarbage() + assert(not collectgarbage("isrunning")) + local a = {} + for i=1,100 do a[i] = {{}}; local b = {} end + local x = gcinfo() + local i = 0 + repeat -- do steps until it completes a collection cycle + i = i+1 + until collectgarbage("step", siz) + assert(gcinfo() < x) + return i +end + +collectgarbage"stop" + +if not _port then + -- test the "size" of basic GC steps (whatever they mean...) + assert(dosteps(0) > 10) + assert(dosteps(10) < dosteps(2)) +end + +-- collector should do a full collection with so many steps +assert(dosteps(20000) == 1) +assert(collectgarbage("step", 20000) == true) +assert(collectgarbage("step", 20000) == true) + +assert(not collectgarbage("isrunning")) +collectgarbage"restart" +assert(collectgarbage("isrunning")) + + +if not _port then + -- test the pace of the collector + collectgarbage(); collectgarbage() + local x = gcinfo() + collectgarbage"stop" + assert(not collectgarbage("isrunning")) + repeat + local a = {} + until gcinfo() > 3 * x + collectgarbage"restart" + assert(collectgarbage("isrunning")) + repeat + local a = {} + until gcinfo() <= x * 2 +end + + +print("clearing tables") +lim = 15 +a = {} +-- fill a with `collectable' indices +for i=1,lim do a[{}] = i end +b = {} +for k,v in pairs(a) do b[k]=v end +-- remove all indices and collect them +for n in pairs(b) do + a[n] = nil + assert(type(n) == 'table' and next(n) == nil) + collectgarbage() +end +b = nil +collectgarbage() +for n in pairs(a) do error'cannot be here' end +for i=1,lim do a[i] = i end +for i=1,lim do assert(a[i] == i) end + + +print('weak tables') +a = {}; setmetatable(a, {__mode = 'k'}); +-- fill a with some `collectable' indices +for i=1,lim do a[{}] = i end +-- and some non-collectable ones +for i=1,lim do a[i] = i end +for i=1,lim do local s=string.rep('@', i); a[s] = s..'#' end +collectgarbage() +local i = 0 +for k,v in pairs(a) do assert(k==v or k..'#'==v); i=i+1 end +assert(i == 2*lim) + +a = {}; setmetatable(a, {__mode = 'v'}); +a[1] = string.rep('b', 21) +collectgarbage() +assert(a[1]) -- strings are *values* +a[1] = nil +-- fill a with some `collectable' values (in both parts of the table) +for i=1,lim do a[i] = {} end +for i=1,lim do a[i..'x'] = {} end +-- and some non-collectable ones +for i=1,lim do local t={}; a[t]=t end +for i=1,lim do a[i+lim]=i..'x' end +collectgarbage() +local i = 0 +for k,v in pairs(a) do assert(k==v or k-lim..'x' == v); i=i+1 end +assert(i == 2*lim) + +a = {}; setmetatable(a, {__mode = 'vk'}); +local x, y, z = {}, {}, {} +-- keep only some items +a[1], a[2], a[3] = x, y, z +a[string.rep('$', 11)] = string.rep('$', 11) +-- fill a with some `collectable' values +for i=4,lim do a[i] = {} end +for i=1,lim do a[{}] = i end +for i=1,lim do local t={}; a[t]=t end +collectgarbage() +assert(next(a) ~= nil) +local i = 0 +for k,v in pairs(a) do + assert((k == 1 and v == x) or + (k == 2 and v == y) or + (k == 3 and v == z) or k==v); + i = i+1 +end +assert(i == 4) +x,y,z=nil +collectgarbage() +assert(next(a) == string.rep('$', 11)) + + +-- 'bug' in 5.1 +a = {} +local t = {x = 10} +local C = setmetatable({key = t}, {__mode = 'v'}) +local C1 = setmetatable({[t] = 1}, {__mode = 'k'}) +a.x = t -- this should not prevent 't' from being removed from + -- weak table 'C' by the time 'a' is finalized + +setmetatable(a, {__gc = function (u) + assert(C.key == nil) + assert(type(next(C1)) == 'table') + end}) + +a, t = nil +collectgarbage() +collectgarbage() +assert(next(C) == nil and next(C1) == nil) +C, C1 = nil + + +-- ephemerons +local mt = {__mode = 'k'} +a = {{10},{20},{30},{40}}; setmetatable(a, mt) +x = nil +for i = 1, 100 do local n = {}; a[n] = {k = {x}}; x = n end +GC() +local n = x +local i = 0 +while n do n = a[n].k[1]; i = i + 1 end +assert(i == 100) +x = nil +GC() +for i = 1, 4 do assert(a[i][1] == i * 10); a[i] = nil end +assert(next(a) == nil) + +local K = {} +a[K] = {} +for i=1,10 do a[K][i] = {}; a[a[K][i]] = setmetatable({}, mt) end +x = nil +local k = 1 +for j = 1,100 do + local n = {}; local nk = k%10 + 1 + a[a[K][nk]][n] = {x, k = k}; x = n; k = nk +end +GC() +local n = x +local i = 0 +while n do local t = a[a[K][k]][n]; n = t[1]; k = t.k; i = i + 1 end +assert(i == 100) +K = nil +GC() +-- assert(next(a) == nil) + + +-- testing errors during GC +do +collectgarbage("stop") -- stop collection +local u = {} +local s = {}; setmetatable(s, {__mode = 'k'}) +setmetatable(u, {__gc = function (o) + local i = s[o] + s[i] = true + assert(not s[i - 1]) -- check proper finalization order + if i == 8 then error("here") end -- error during GC +end}) + +for i = 6, 10 do + local n = setmetatable({}, getmetatable(u)) + s[n] = i +end + +assert(not pcall(collectgarbage)) +for i = 8, 10 do assert(s[i]) end + +for i = 1, 5 do + local n = setmetatable({}, getmetatable(u)) + s[n] = i +end + +collectgarbage() +for i = 1, 10 do assert(s[i]) end + +getmetatable(u).__gc = false + + +-- __gc errors with non-string messages +setmetatable({}, {__gc = function () error{} end}) +local a, b = pcall(collectgarbage) +assert(not a and type(b) == "string" and string.find(b, "error in __gc")) + +end +print '+' + + +-- testing userdata +if T==nil then + (Message or print)('\n >>> testC not active: skipping userdata GC tests <<<\n') + +else + + local function newproxy(u) + return debug.setmetatable(T.newuserdata(0), debug.getmetatable(u)) + end + + collectgarbage("stop") -- stop collection + local u = newproxy(nil) + debug.setmetatable(u, {__gc = true}) + local s = 0 + local a = {[u] = 0}; setmetatable(a, {__mode = 'vk'}) + for i=1,10 do a[newproxy(u)] = i end + for k in pairs(a) do assert(getmetatable(k) == getmetatable(u)) end + local a1 = {}; for k,v in pairs(a) do a1[k] = v end + for k,v in pairs(a1) do a[v] = k end + for i =1,10 do assert(a[i]) end + getmetatable(u).a = a1 + getmetatable(u).u = u + do + local u = u + getmetatable(u).__gc = function (o) + assert(a[o] == 10-s) + assert(a[10-s] == nil) -- udata already removed from weak table + assert(getmetatable(o) == getmetatable(u)) + assert(getmetatable(o).a[o] == 10-s) + s=s+1 + end + end + a1, u = nil + assert(next(a) ~= nil) + collectgarbage() + assert(s==11) + collectgarbage() + assert(next(a) == nil) -- finalized keys are removed in two cycles +end + + +-- __gc x weak tables +local u = setmetatable({}, {__gc = true}) +-- __gc metamethod should be collected before running +setmetatable(getmetatable(u), {__mode = "v"}) +getmetatable(u).__gc = function (o) os.exit(1) end -- cannot happen +u = nil +collectgarbage() + +local u = setmetatable({}, {__gc = true}) +local m = getmetatable(u) +m.x = {[{0}] = 1; [0] = {1}}; setmetatable(m.x, {__mode = "kv"}); +m.__gc = function (o) + assert(next(getmetatable(o).x) == nil) + m = 10 +end +u, m = nil +collectgarbage() +assert(m==10) + + +-- errors during collection +u = setmetatable({}, {__gc = function () error "!!!" end}) +u = nil +assert(not pcall(collectgarbage)) + + +if not _soft then + print("deep structures") + local a = {} + for i = 1,200000 do + a = {next = a} + end + collectgarbage() +end + +-- create many threads with self-references and open upvalues +print("self-referenced threads") +local thread_id = 0 +local threads = {} + +local function fn (thread) + local x = {} + threads[thread_id] = function() + thread = x + end + coroutine.yield() +end + +while thread_id < 1000 do + local thread = coroutine.create(fn) + coroutine.resume(thread, thread) + thread_id = thread_id + 1 +end + + +-- Create a closure (function inside 'f') with an upvalue ('param') that +-- points (through a table) to the closure itself and to the thread +-- ('co' and the initial value of 'param') where closure is running. +-- Then, assert that table (and therefore everything else) will be +-- collected. +do + local collected = false -- to detect collection + collectgarbage(); collectgarbage("stop") + do + local function f (param) + ;(function () + assert(type(f) == 'function' and type(param) == 'thread') + param = {param, f} + setmetatable(param, {__gc = function () collected = true end}) + coroutine.yield(100) + end)() + end + local co = coroutine.create(f) + assert(coroutine.resume(co, co)) + end + -- Now, thread and closure are not reacheable any more; + -- two collections are needed to break cycle + collectgarbage() + assert(not collected) + collectgarbage() + assert(collected) + collectgarbage("restart") +end + + +do + collectgarbage() + collectgarbage"stop" + local x = gcinfo() + repeat + for i=1,1000 do _ENV.a = {} end + collectgarbage("step", 0) -- steps should not unblock the collector + until gcinfo() > 2 * x + collectgarbage"restart" +end + + +if T then -- tests for weird cases collecting upvalues + + local function foo () + local a = {x = 20} + coroutine.yield(function () return a.x end) -- will run collector + assert(a.x == 20) -- 'a' is 'ok' + a = {x = 30} -- create a new object + assert(T.gccolor(a) == "white") -- of course it is new... + coroutine.yield(100) -- 'a' is still local to this thread + end + + local t = setmetatable({}, {__mode = "kv"}) + collectgarbage(); collectgarbage('stop') + -- create coroutine in a weak table, so it will never be marked + t.co = coroutine.wrap(foo) + local f = t.co() -- create function to access local 'a' + T.gcstate("atomic") -- ensure all objects are traversed + assert(T.gcstate() == "atomic") + assert(t.co() == 100) -- resume coroutine, creating new table for 'a' + assert(T.gccolor(t.co) == "white") -- thread was not traversed + T.gcstate("pause") -- collect thread, but should mark 'a' before that + assert(t.co == nil and f() == 30) -- ensure correct access to 'a' + + collectgarbage("restart") + + -- test barrier in sweep phase (advance cleaning of upvalue to white) + local u = T.newuserdata(0) -- create a userdata + collectgarbage() + collectgarbage"stop" + T.gcstate"atomic" + T.gcstate"sweepallgc" + local x = {} + assert(T.gccolor(u) == "black") -- upvalue is "old" (black) + assert(T.gccolor(x) == "white") -- table is "new" (white) + debug.setuservalue(u, x) -- trigger barrier + assert(T.gccolor(u) == "white") -- upvalue changed to white + collectgarbage"restart" + + print"+" +end + + +if T then + local debug = require "debug" + collectgarbage("stop") + local x = T.newuserdata(0) + local y = T.newuserdata(0) + debug.setmetatable(y, {__gc = true}) -- bless the new udata before... + debug.setmetatable(x, {__gc = true}) -- ...the old one + assert(T.gccolor(y) == "white") + T.checkmemory() + collectgarbage("restart") +end + + +if T then + print("emergency collections") + collectgarbage() + collectgarbage() + T.totalmem(T.totalmem() + 200) + for i=1,200 do local a = {} end + T.totalmem(0) + collectgarbage() + local t = T.totalmem("table") + local a = {{}, {}, {}} -- create 4 new tables + assert(T.totalmem("table") == t + 4) + t = T.totalmem("function") + a = function () end -- create 1 new closure + assert(T.totalmem("function") == t + 1) + t = T.totalmem("thread") + a = coroutine.create(function () end) -- create 1 new coroutine + assert(T.totalmem("thread") == t + 1) +end + +-- create an object to be collected when state is closed +do + local setmetatable,assert,type,print,getmetatable = + setmetatable,assert,type,print,getmetatable + local tt = {} + tt.__gc = function (o) + assert(getmetatable(o) == tt) + -- create new objects during GC + local a = 'xuxu'..(10+3)..'joao', {} + ___Glob = o -- ressurect object! + setmetatable({}, tt) -- creates a new one with same metatable + print(">>> closing state " .. "<<<\n") + end + local u = setmetatable({}, tt) + ___Glob = {u} -- avoid object being collected before program end +end + +-- create several objects to raise errors when collected while closing state +do + local mt = {__gc = function (o) return o + 1 end} + for i = 1,10 do + -- create object and preserve it until the end + table.insert(___Glob, setmetatable({}, mt)) + end +end + +-- just to make sure +assert(collectgarbage'isrunning') + +print('OK') diff --git a/06/parser-gen/parsers/lua-5.3.4-tests/goto.lua b/06/parser-gen/parsers/lua-5.3.4-tests/goto.lua new file mode 100644 index 0000000..0372aa9 --- /dev/null +++ b/06/parser-gen/parsers/lua-5.3.4-tests/goto.lua @@ -0,0 +1,232 @@ +-- $Id: goto.lua,v 1.13 2016/11/07 13:11:28 roberto Exp $ +-- See Copyright Notice in file all.lua + +collectgarbage() + +local function errmsg (code, m) + local st, msg = load(code) + assert(not st and string.find(msg, m)) +end + +-- cannot see label inside block +errmsg([[ goto l1; do ::l1:: end ]], "label 'l1'") +errmsg([[ do ::l1:: end goto l1; ]], "label 'l1'") + +-- repeated label +errmsg([[ ::l1:: ::l1:: ]], "label 'l1'") + + +-- undefined label +errmsg([[ goto l1; local aa ::l1:: ::l2:: print(3) ]], "local 'aa'") + +-- jumping over variable definition +errmsg([[ +do local bb, cc; goto l1; end +local aa +::l1:: print(3) +]], "local 'aa'") + +-- jumping into a block +errmsg([[ do ::l1:: end goto l1 ]], "label 'l1'") +errmsg([[ goto l1 do ::l1:: end ]], "label 'l1'") + +-- cannot continue a repeat-until with variables +errmsg([[ + repeat + if x then goto cont end + local xuxu = 10 + ::cont:: + until xuxu < x +]], "local 'xuxu'") + +-- simple gotos +local x +do + local y = 12 + goto l1 + ::l2:: x = x + 1; goto l3 + ::l1:: x = y; goto l2 +end +::l3:: ::l3_1:: assert(x == 13) + + +-- long labels +do + local prog = [[ + do + local a = 1 + goto l%sa; a = a + 1 + ::l%sa:: a = a + 10 + goto l%sb; a = a + 2 + ::l%sb:: a = a + 20 + return a + end + ]] + local label = string.rep("0123456789", 40) + prog = string.format(prog, label, label, label, label) + assert(assert(load(prog))() == 31) +end + +-- goto to correct label when nested +do goto l3; ::l3:: end -- does not loop jumping to previous label 'l3' + +-- ok to jump over local dec. to end of block +do + goto l1 + local a = 23 + x = a + ::l1::; +end + +while true do + goto l4 + goto l1 -- ok to jump over local dec. to end of block + goto l1 -- multiple uses of same label + local x = 45 + ::l1:: ;;; +end +::l4:: assert(x == 13) + +if print then + goto l1 -- ok to jump over local dec. to end of block + error("should not be here") + goto l2 -- ok to jump over local dec. to end of block + local x + ::l1:: ; ::l2:: ;; +else end + +-- to repeat a label in a different function is OK +local function foo () + local a = {} + goto l3 + ::l1:: a[#a + 1] = 1; goto l2; + ::l2:: a[#a + 1] = 2; goto l5; + ::l3:: + ::l3a:: a[#a + 1] = 3; goto l1; + ::l4:: a[#a + 1] = 4; goto l6; + ::l5:: a[#a + 1] = 5; goto l4; + ::l6:: assert(a[1] == 3 and a[2] == 1 and a[3] == 2 and + a[4] == 5 and a[5] == 4) + if not a[6] then a[6] = true; goto l3a end -- do it twice +end + +::l6:: foo() + + +do -- bug in 5.2 -> 5.3.2 + local x + ::L1:: + local y -- cannot join this SETNIL with previous one + assert(y == nil) + y = true + if x == nil then + x = 1 + goto L1 + else + x = x + 1 + end + assert(x == 2 and y == true) +end + +-------------------------------------------------------------------------------- +-- testing closing of upvalues + +local debug = require 'debug' + +local function foo () + local t = {} + do + local i = 1 + local a, b, c, d + t[1] = function () return a, b, c, d end + ::l1:: + local b + do + local c + t[#t + 1] = function () return a, b, c, d end -- t[2], t[4], t[6] + if i > 2 then goto l2 end + do + local d + t[#t + 1] = function () return a, b, c, d end -- t[3], t[5] + i = i + 1 + local a + goto l1 + end + end + end + ::l2:: return t +end + +local a = foo() +assert(#a == 6) + +-- all functions share same 'a' +for i = 2, 6 do + assert(debug.upvalueid(a[1], 1) == debug.upvalueid(a[i], 1)) +end + +-- 'b' and 'c' are shared among some of them +for i = 2, 6 do + -- only a[1] uses external 'b'/'b' + assert(debug.upvalueid(a[1], 2) ~= debug.upvalueid(a[i], 2)) + assert(debug.upvalueid(a[1], 3) ~= debug.upvalueid(a[i], 3)) +end + +for i = 3, 5, 2 do + -- inner functions share 'b'/'c' with previous ones + assert(debug.upvalueid(a[i], 2) == debug.upvalueid(a[i - 1], 2)) + assert(debug.upvalueid(a[i], 3) == debug.upvalueid(a[i - 1], 3)) + -- but not with next ones + assert(debug.upvalueid(a[i], 2) ~= debug.upvalueid(a[i + 1], 2)) + assert(debug.upvalueid(a[i], 3) ~= debug.upvalueid(a[i + 1], 3)) +end + +-- only external 'd' is shared +for i = 2, 6, 2 do + assert(debug.upvalueid(a[1], 4) == debug.upvalueid(a[i], 4)) +end + +-- internal 'd's are all different +for i = 3, 5, 2 do + for j = 1, 6 do + assert((debug.upvalueid(a[i], 4) == debug.upvalueid(a[j], 4)) + == (i == j)) + end +end + +-------------------------------------------------------------------------------- +-- testing if x goto optimizations + +local function testG (a) + if a == 1 then + goto l1 + error("should never be here!") + elseif a == 2 then goto l2 + elseif a == 3 then goto l3 + elseif a == 4 then + goto l1 -- go to inside the block + error("should never be here!") + ::l1:: a = a + 1 -- must go to 'if' end + else + goto l4 + ::l4a:: a = a * 2; goto l4b + error("should never be here!") + ::l4:: goto l4a + error("should never be here!") + ::l4b:: + end + do return a end + ::l2:: do return "2" end + ::l3:: do return "3" end + ::l1:: return "1" +end + +assert(testG(1) == "1") +assert(testG(2) == "2") +assert(testG(3) == "3") +assert(testG(4) == 5) +assert(testG(5) == 10) +-------------------------------------------------------------------------------- + + +print'OK' diff --git a/06/parser-gen/parsers/lua-5.3.4-tests/literals.lua b/06/parser-gen/parsers/lua-5.3.4-tests/literals.lua new file mode 100644 index 0000000..3922b3f --- /dev/null +++ b/06/parser-gen/parsers/lua-5.3.4-tests/literals.lua @@ -0,0 +1,302 @@ +-- $Id: literals.lua,v 1.36 2016/11/07 13:11:28 roberto Exp $ +-- See Copyright Notice in file all.lua + +print('testing scanner') + +local debug = require "debug" + + +local function dostring (x) return assert(load(x), "")() end + +dostring("x \v\f = \t\r 'a\0a' \v\f\f") +assert(x == 'a\0a' and string.len(x) == 3) + +-- escape sequences +assert('\n\"\'\\' == [[ + +"'\]]) + +assert(string.find("\a\b\f\n\r\t\v", "^%c%c%c%c%c%c%c$")) + +-- assume ASCII just for tests: +assert("\09912" == 'c12') +assert("\99ab" == 'cab') +assert("\099" == '\99') +assert("\099\n" == 'c\10') +assert('\0\0\0alo' == '\0' .. '\0\0' .. 'alo') + +assert(010 .. 020 .. -030 == "1020-30") + +-- hexadecimal escapes +assert("\x00\x05\x10\x1f\x3C\xfF\xe8" == "\0\5\16\31\60\255\232") + +local function lexstring (x, y, n) + local f = assert(load('return ' .. x .. + ', require"debug".getinfo(1).currentline', '')) + local s, l = f() + assert(s == y and l == n) +end + +lexstring("'abc\\z \n efg'", "abcefg", 2) +lexstring("'abc\\z \n\n\n'", "abc", 4) +lexstring("'\\z \n\t\f\v\n'", "", 3) +lexstring("[[\nalo\nalo\n\n]]", "alo\nalo\n\n", 5) +lexstring("[[\nalo\ralo\n\n]]", "alo\nalo\n\n", 5) +lexstring("[[\nalo\ralo\r\n]]", "alo\nalo\n", 4) +lexstring("[[\ralo\n\ralo\r\n]]", "alo\nalo\n", 4) +lexstring("[[alo]\n]alo]]", "alo]\n]alo", 2) + +assert("abc\z + def\z + ghi\z + " == 'abcdefghi') + + +-- UTF-8 sequences +assert("\u{0}\u{00000000}\x00\0" == string.char(0, 0, 0, 0)) + +-- limits for 1-byte sequences +assert("\u{0}\u{7F}" == "\x00\z\x7F") + +-- limits for 2-byte sequences +assert("\u{80}\u{7FF}" == "\xC2\x80\z\xDF\xBF") + +-- limits for 3-byte sequences +assert("\u{800}\u{FFFF}" == "\xE0\xA0\x80\z\xEF\xBF\xBF") + +-- limits for 4-byte sequences +assert("\u{10000}\u{10FFFF}" == "\xF0\x90\x80\x80\z\xF4\x8F\xBF\xBF") + + +-- Error in escape sequences +local function lexerror (s, err) + local st, msg = load('return ' .. s, '') + if err ~= '' then err = err .. "'" end + assert(not st and string.find(msg, "near .-" .. err)) +end + +lexerror([["abc\x"]], [[\x"]]) +lexerror([["abc\x]], [[\x]]) +lexerror([["\x]], [[\x]]) +lexerror([["\x5"]], [[\x5"]]) +lexerror([["\x5]], [[\x5]]) +lexerror([["\xr"]], [[\xr]]) +lexerror([["\xr]], [[\xr]]) +lexerror([["\x.]], [[\x.]]) +lexerror([["\x8%"]], [[\x8%%]]) +lexerror([["\xAG]], [[\xAG]]) +lexerror([["\g"]], [[\g]]) +lexerror([["\g]], [[\g]]) +lexerror([["\."]], [[\%.]]) + +lexerror([["\999"]], [[\999"]]) +lexerror([["xyz\300"]], [[\300"]]) +lexerror([[" \256"]], [[\256"]]) + +-- errors in UTF-8 sequences +lexerror([["abc\u{110000}"]], [[abc\u{110000]]) -- too large +lexerror([["abc\u11r"]], [[abc\u1]]) -- missing '{' +lexerror([["abc\u"]], [[abc\u"]]) -- missing '{' +lexerror([["abc\u{11r"]], [[abc\u{11r]]) -- missing '}' +lexerror([["abc\u{11"]], [[abc\u{11"]]) -- missing '}' +lexerror([["abc\u{11]], [[abc\u{11]]) -- missing '}' +lexerror([["abc\u{r"]], [[abc\u{r]]) -- no digits + +-- unfinished strings +lexerror("[=[alo]]", "") +lexerror("[=[alo]=", "") +lexerror("[=[alo]", "") +lexerror("'alo", "") +lexerror("'alo \\z \n\n", "") +lexerror("'alo \\z", "") +lexerror([['alo \98]], "") + +-- valid characters in variable names +for i = 0, 255 do + local s = string.char(i) + assert(not string.find(s, "[a-zA-Z_]") == not load(s .. "=1", "")) + assert(not string.find(s, "[a-zA-Z_0-9]") == + not load("a" .. s .. "1 = 1", "")) +end + + +-- long variable names + +var1 = string.rep('a', 15000) .. '1' +var2 = string.rep('a', 15000) .. '2' +prog = string.format([[ + %s = 5 + %s = %s + 1 + return function () return %s - %s end +]], var1, var2, var1, var1, var2) +local f = dostring(prog) +assert(_G[var1] == 5 and _G[var2] == 6 and f() == -1) +var1, var2, f = nil +print('+') + +-- escapes -- +assert("\n\t" == [[ + + ]]) +assert([[ + + $debug]] == "\n $debug") +assert([[ [ ]] ~= [[ ] ]]) +-- long strings -- +b = "001234567890123456789012345678901234567891234567890123456789012345678901234567890012345678901234567890123456789012345678912345678901234567890123456789012345678900123456789012345678901234567890123456789123456789012345678901234567890123456789001234567890123456789012345678901234567891234567890123456789012345678901234567890012345678901234567890123456789012345678912345678901234567890123456789012345678900123456789012345678901234567890123456789123456789012345678901234567890123456789001234567890123456789012345678901234567891234567890123456789012345678901234567890012345678901234567890123456789012345678912345678901234567890123456789012345678900123456789012345678901234567890123456789123456789012345678901234567890123456789001234567890123456789012345678901234567891234567890123456789012345678901234567890012345678901234567890123456789012345678912345678901234567890123456789012345678900123456789012345678901234567890123456789123456789012345678901234567890123456789" +assert(string.len(b) == 960) +prog = [=[ +print('+') + +a1 = [["this is a 'string' with several 'quotes'"]] +a2 = "'quotes'" + +assert(string.find(a1, a2) == 34) +print('+') + +a1 = [==[temp = [[an arbitrary value]]; ]==] +assert(load(a1))() +assert(temp == 'an arbitrary value') +-- long strings -- +b = "001234567890123456789012345678901234567891234567890123456789012345678901234567890012345678901234567890123456789012345678912345678901234567890123456789012345678900123456789012345678901234567890123456789123456789012345678901234567890123456789001234567890123456789012345678901234567891234567890123456789012345678901234567890012345678901234567890123456789012345678912345678901234567890123456789012345678900123456789012345678901234567890123456789123456789012345678901234567890123456789001234567890123456789012345678901234567891234567890123456789012345678901234567890012345678901234567890123456789012345678912345678901234567890123456789012345678900123456789012345678901234567890123456789123456789012345678901234567890123456789001234567890123456789012345678901234567891234567890123456789012345678901234567890012345678901234567890123456789012345678912345678901234567890123456789012345678900123456789012345678901234567890123456789123456789012345678901234567890123456789" +assert(string.len(b) == 960) +print('+') + +a = [[00123456789012345678901234567890123456789123456789012345678901234567890123456789 +00123456789012345678901234567890123456789123456789012345678901234567890123456789 +00123456789012345678901234567890123456789123456789012345678901234567890123456789 +00123456789012345678901234567890123456789123456789012345678901234567890123456789 +00123456789012345678901234567890123456789123456789012345678901234567890123456789 +00123456789012345678901234567890123456789123456789012345678901234567890123456789 +00123456789012345678901234567890123456789123456789012345678901234567890123456789 +00123456789012345678901234567890123456789123456789012345678901234567890123456789 +00123456789012345678901234567890123456789123456789012345678901234567890123456789 +00123456789012345678901234567890123456789123456789012345678901234567890123456789 +00123456789012345678901234567890123456789123456789012345678901234567890123456789 +00123456789012345678901234567890123456789123456789012345678901234567890123456789 +00123456789012345678901234567890123456789123456789012345678901234567890123456789 +00123456789012345678901234567890123456789123456789012345678901234567890123456789 +00123456789012345678901234567890123456789123456789012345678901234567890123456789 +00123456789012345678901234567890123456789123456789012345678901234567890123456789 +00123456789012345678901234567890123456789123456789012345678901234567890123456789 +00123456789012345678901234567890123456789123456789012345678901234567890123456789 +00123456789012345678901234567890123456789123456789012345678901234567890123456789 +00123456789012345678901234567890123456789123456789012345678901234567890123456789 +00123456789012345678901234567890123456789123456789012345678901234567890123456789 +00123456789012345678901234567890123456789123456789012345678901234567890123456789 +00123456789012345678901234567890123456789123456789012345678901234567890123456789 +]] +assert(string.len(a) == 1863) +assert(string.sub(a, 1, 40) == string.sub(b, 1, 40)) +x = 1 +]=] + +print('+') +x = nil +dostring(prog) +assert(x) + +prog = nil +a = nil +b = nil + + +-- testing line ends +prog = [[ +a = 1 -- a comment +b = 2 + + +x = [=[ +hi +]=] +y = "\ +hello\r\n\ +" +return require"debug".getinfo(1).currentline +]] + +for _, n in pairs{"\n", "\r", "\n\r", "\r\n"} do + local prog, nn = string.gsub(prog, "\n", n) + assert(dostring(prog) == nn) + assert(_G.x == "hi\n" and _G.y == "\nhello\r\n\n") +end + + +-- testing comments and strings with long brackets +a = [==[]=]==] +assert(a == "]=") + +a = [==[[===[[=[]]=][====[]]===]===]==] +assert(a == "[===[[=[]]=][====[]]===]===") + +a = [====[[===[[=[]]=][====[]]===]===]====] +assert(a == "[===[[=[]]=][====[]]===]===") + +a = [=[]]]]]]]]]=] +assert(a == "]]]]]]]]") + + +--[===[ +x y z [==[ blu foo +]== +] +]=]==] +error error]=]===] + +-- generate all strings of four of these chars +local x = {"=", "[", "]", "\n"} +local len = 4 +local function gen (c, n) + if n==0 then coroutine.yield(c) + else + for _, a in pairs(x) do + gen(c..a, n-1) + end + end +end + +for s in coroutine.wrap(function () gen("", len) end) do + assert(s == load("return [====[\n"..s.."]====]", "")()) +end + + +-- testing decimal point locale +if os.setlocale("pt_BR") or os.setlocale("ptb") then + assert(tonumber("3,4") == 3.4 and tonumber"3.4" == 3.4) + assert(tonumber(" -.4 ") == -0.4) + assert(tonumber(" +0x.41 ") == 0X0.41) + assert(not load("a = (3,4)")) + assert(assert(load("return 3.4"))() == 3.4) + assert(assert(load("return .4,3"))() == .4) + assert(assert(load("return 4."))() == 4.) + assert(assert(load("return 4.+.5"))() == 4.5) + + assert(" 0x.1 " + " 0x,1" + "-0X.1\t" == 0x0.1) + + assert(tonumber"inf" == nil and tonumber"NAN" == nil) + + assert(assert(load(string.format("return %q", 4.51)))() == 4.51) + + local a,b = load("return 4.5.") + assert(string.find(b, "'4%.5%.'")) + + assert(os.setlocale("C")) +else + (Message or print)( + '\n >>> pt_BR locale not available: skipping decimal point tests <<<\n') +end + + +-- testing %q x line ends +local s = "a string with \r and \n and \r\n and \n\r" +local c = string.format("return %q", s) +assert(assert(load(c))() == s) + +-- testing errors +assert(not load"a = 'non-ending string") +assert(not load"a = 'non-ending string\n'") +assert(not load"a = '\\345'") +assert(not load"a = [=x]") + +print('OK') diff --git a/06/parser-gen/parsers/lua-5.3.4-tests/locals.lua b/06/parser-gen/parsers/lua-5.3.4-tests/locals.lua new file mode 100644 index 0000000..f66f6f7 --- /dev/null +++ b/06/parser-gen/parsers/lua-5.3.4-tests/locals.lua @@ -0,0 +1,162 @@ +-- $Id: locals.lua,v 1.37 2016/11/07 13:11:28 roberto Exp $ +-- See Copyright Notice in file all.lua + +print('testing local variables and environments') + +local debug = require"debug" + + +-- bug in 5.1: + +local function f(x) x = nil; return x end +assert(f(10) == nil) + +local function f() local x; return x end +assert(f(10) == nil) + +local function f(x) x = nil; local y; return x, y end +assert(f(10) == nil and select(2, f(20)) == nil) + +do + local i = 10 + do local i = 100; assert(i==100) end + do local i = 1000; assert(i==1000) end + assert(i == 10) + if i ~= 10 then + local i = 20 + else + local i = 30 + assert(i == 30) + end +end + + + +f = nil + +local f +x = 1 + +a = nil +load('local a = {}')() +assert(a == nil) + +function f (a) + local _1, _2, _3, _4, _5 + local _6, _7, _8, _9, _10 + local x = 3 + local b = a + local c,d = a,b + if (d == b) then + local x = 'q' + x = b + assert(x == 2) + else + assert(nil) + end + assert(x == 3) + local f = 10 +end + +local b=10 +local a; repeat local b; a,b=1,2; assert(a+1==b); until a+b==3 + + +assert(x == 1) + +f(2) +assert(type(f) == 'function') + + +local function getenv (f) + local a,b = debug.getupvalue(f, 1) + assert(a == '_ENV') + return b +end + +-- test for global table of loaded chunks +assert(getenv(load"a=3") == _G) +local c = {}; local f = load("a = 3", nil, nil, c) +assert(getenv(f) == c) +assert(c.a == nil) +f() +assert(c.a == 3) + +-- old test for limits for special instructions (now just a generic test) +do + local i = 2 + local p = 4 -- p == 2^i + repeat + for j=-3,3 do + assert(load(string.format([[local a=%s; + a=a+%s; + assert(a ==2^%s)]], j, p-j, i), '')) () + assert(load(string.format([[local a=%s; + a=a-%s; + assert(a==-2^%s)]], -j, p-j, i), '')) () + assert(load(string.format([[local a,b=0,%s; + a=b-%s; + assert(a==-2^%s)]], -j, p-j, i), '')) () + end + p = 2 * p; i = i + 1 + until p <= 0 +end + +print'+' + + +if rawget(_G, "querytab") then + -- testing clearing of dead elements from tables + collectgarbage("stop") -- stop GC + local a = {[{}] = 4, [3] = 0, alo = 1, + a1234567890123456789012345678901234567890 = 10} + + local t = querytab(a) + + for k,_ in pairs(a) do a[k] = nil end + collectgarbage() -- restore GC and collect dead fiels in `a' + for i=0,t-1 do + local k = querytab(a, i) + assert(k == nil or type(k) == 'number' or k == 'alo') + end +end + + +-- testing lexical environments + +assert(_ENV == _G) + +do +local dummy +local _ENV = (function (...) return ... end)(_G, dummy) -- { + +do local _ENV = {assert=assert}; assert(true) end +mt = {_G = _G} +local foo,x +A = false -- "declare" A +do local _ENV = mt + function foo (x) + A = x + do local _ENV = _G; A = 1000 end + return function (x) return A .. x end + end +end +assert(getenv(foo) == mt) +x = foo('hi'); assert(mt.A == 'hi' and A == 1000) +assert(x('*') == mt.A .. '*') + +do local _ENV = {assert=assert, A=10}; + do local _ENV = {assert=assert, A=20}; + assert(A==20);x=A + end + assert(A==10 and x==20) +end +assert(x==20) + + +print('OK') + +return 5,f + +end -- } + diff --git a/06/parser-gen/parsers/lua-5.3.4-tests/main.lua b/06/parser-gen/parsers/lua-5.3.4-tests/main.lua new file mode 100644 index 0000000..a1809ce --- /dev/null +++ b/06/parser-gen/parsers/lua-5.3.4-tests/main.lua @@ -0,0 +1,381 @@ +#! testing special comment on first line +-- $Id: main.lua,v 1.65 2016/11/07 13:11:28 roberto Exp $ +-- See Copyright Notice in file all.lua + +-- most (all?) tests here assume a reasonable "Unix-like" shell +if _port then return end + +-- use only "double quotes" inside shell scripts (better change to +-- run on Windows) + + +print ("testing stand-alone interpreter") + +assert(os.execute()) -- machine has a system command + +local arg = arg or _ARG + +local prog = os.tmpname() +local otherprog = os.tmpname() +local out = os.tmpname() + +local progname +do + local i = 0 + while arg[i] do i=i-1 end + progname = arg[i+1] +end +print("progname: "..progname) + +local prepfile = function (s, p) + p = p or prog + io.output(p) + io.write(s) + assert(io.close()) +end + +local function getoutput () + io.input(out) + local t = io.read("a") + io.input():close() + assert(os.remove(out)) + return t +end + +local function checkprogout (s) + local t = getoutput() + for line in string.gmatch(s, ".-\n") do + assert(string.find(t, line, 1, true)) + end +end + +local function checkout (s) + local t = getoutput() + if s ~= t then print(string.format("'%s' - '%s'\n", s, t)) end + assert(s == t) + return t +end + + +local function RUN (p, ...) + p = string.gsub(p, "lua", '"'..progname..'"', 1) + local s = string.format(p, ...) + assert(os.execute(s)) +end + +local function NoRun (msg, p, ...) + p = string.gsub(p, "lua", '"'..progname..'"', 1) + local s = string.format(p, ...) + s = string.format("%s 2> %s", s, out) -- will send error to 'out' + assert(not os.execute(s)) + assert(string.find(getoutput(), msg, 1, true)) -- check error message +end + +RUN('lua -v') + +print(string.format("(temporary program file used in these tests: %s)", prog)) + +-- running stdin as a file +prepfile"" +RUN('lua - < %s > %s', prog, out) +checkout("") + +prepfile[[ + print( +1, a +) +]] +RUN('lua - < %s > %s', prog, out) +checkout("1\tnil\n") + +RUN('echo "print(10)\nprint(2)\n" | lua > %s', out) +checkout("10\n2\n") + + +-- test option '-' +RUN('echo "print(arg[1])" | lua - -h > %s', out) +checkout("-h\n") + +-- test environment variables used by Lua + +prepfile("print(package.path)") + +-- test LUA_PATH +RUN('env LUA_INIT= LUA_PATH=x lua %s > %s', prog, out) +checkout("x\n") + +-- test LUA_PATH_version +RUN('env LUA_INIT= LUA_PATH_5_3=y LUA_PATH=x lua %s > %s', prog, out) +checkout("y\n") + +-- test LUA_CPATH +prepfile("print(package.cpath)") +RUN('env LUA_INIT= LUA_CPATH=xuxu lua %s > %s', prog, out) +checkout("xuxu\n") + +-- test LUA_CPATH_version +RUN('env LUA_INIT= LUA_CPATH_5_3=yacc LUA_CPATH=x lua %s > %s', prog, out) +checkout("yacc\n") + +-- test LUA_INIT (and its access to 'arg' table) +prepfile("print(X)") +RUN('env LUA_INIT="X=tonumber(arg[1])" lua %s 3.2 > %s', prog, out) +checkout("3.2\n") + +-- test LUA_INIT_version +prepfile("print(X)") +RUN('env LUA_INIT_5_3="X=10" LUA_INIT="X=3" lua %s > %s', prog, out) +checkout("10\n") + +-- test LUA_INIT for files +prepfile("x = x or 10; print(x); x = x + 1") +RUN('env LUA_INIT="@%s" lua %s > %s', prog, prog, out) +checkout("10\n11\n") + +-- test errors in LUA_INIT +NoRun('LUA_INIT:1: msg', 'env LUA_INIT="error(\'msg\')" lua') + +-- test option '-E' +local defaultpath, defaultCpath + +do + prepfile("print(package.path, package.cpath)") + RUN('env LUA_INIT="error(10)" LUA_PATH=xxx LUA_CPATH=xxx lua -E %s > %s', + prog, out) + local out = getoutput() + defaultpath = string.match(out, "^(.-)\t") + defaultCpath = string.match(out, "\t(.-)$") +end + +-- paths did not changed +assert(not string.find(defaultpath, "xxx") and + string.find(defaultpath, "lua") and + not string.find(defaultCpath, "xxx") and + string.find(defaultCpath, "lua")) + + +-- test replacement of ';;' to default path +local function convert (p) + prepfile("print(package.path)") + RUN('env LUA_PATH="%s" lua %s > %s', p, prog, out) + local expected = getoutput() + expected = string.sub(expected, 1, -2) -- cut final end of line + assert(string.gsub(p, ";;", ";"..defaultpath..";") == expected) +end + +convert(";") +convert(";;") +convert(";;;") +convert(";;;;") +convert(";;;;;") +convert(";;a;;;bc") + + +-- test -l over multiple libraries +prepfile("print(1); a=2; return {x=15}") +prepfile(("print(a); print(_G['%s'].x)"):format(prog), otherprog) +RUN('env LUA_PATH="?;;" lua -l %s -l%s -lstring -l io %s > %s', prog, otherprog, otherprog, out) +checkout("1\n2\n15\n2\n15\n") + +-- test 'arg' table +local a = [[ + assert(#arg == 3 and arg[1] == 'a' and + arg[2] == 'b' and arg[3] == 'c') + assert(arg[-1] == '--' and arg[-2] == "-e " and arg[-3] == '%s') + assert(arg[4] == nil and arg[-4] == nil) + local a, b, c = ... + assert(... == 'a' and a == 'a' and b == 'b' and c == 'c') +]] +a = string.format(a, progname) +prepfile(a) +RUN('lua "-e " -- %s a b c', prog) -- "-e " runs an empty command + +-- test 'arg' availability in libraries +prepfile"assert(arg)" +prepfile("assert(arg)", otherprog) +RUN('env LUA_PATH="?;;" lua -l%s - < %s', prog, otherprog) + +-- test messing up the 'arg' table +RUN('echo "print(...)" | lua -e "arg[1] = 100" - > %s', out) +checkout("100\n") +NoRun("'arg' is not a table", 'echo "" | lua -e "arg = 1" -') + +-- test error in 'print' +RUN('echo 10 | lua -e "print=nil" -i > /dev/null 2> %s', out) +assert(string.find(getoutput(), "error calling 'print'")) + +-- test 'debug.debug' +RUN('echo "io.stderr:write(1000)\ncont" | lua -e "require\'debug\'.debug()" 2> %s', out) +checkout("lua_debug> 1000lua_debug> ") + +-- test many arguments +prepfile[[print(({...})[30])]] +RUN('lua %s %s > %s', prog, string.rep(" a", 30), out) +checkout("a\n") + +RUN([[lua "-eprint(1)" -ea=3 -e "print(a)" > %s]], out) +checkout("1\n3\n") + +-- test iteractive mode +prepfile[[ +(6*2-6) -- === +a = +10 +print(a) +a]] +RUN([[lua -e"_PROMPT='' _PROMPT2=''" -i < %s > %s]], prog, out) +checkprogout("6\n10\n10\n\n") + +prepfile("a = [[b\nc\nd\ne]]\n=a") +RUN([[lua -e"_PROMPT='' _PROMPT2=''" -i < %s > %s]], prog, out) +checkprogout("b\nc\nd\ne\n\n") + +prompt = "alo" +prepfile[[ -- +a = 2 +]] +RUN([[lua "-e_PROMPT='%s'" -i < %s > %s]], prompt, prog, out) +local t = getoutput() +assert(string.find(t, prompt .. ".*" .. prompt .. ".*" .. prompt)) + +-- test for error objects +prepfile[[ +debug = require "debug" +m = {x=0} +setmetatable(m, {__tostring = function(x) + return tostring(debug.getinfo(4).currentline + x.x) +end}) +error(m) +]] +NoRun(progname .. ": 6\n", [[lua %s]], prog) + +prepfile("error{}") +NoRun("error object is a table value", [[lua %s]], prog) + + +-- chunk broken in many lines +s = [=[ -- +function f ( x ) + local a = [[ +xuxu +]] + local b = "\ +xuxu\n" + if x == 11 then return 1 + 12 , 2 + 20 end --[[ test multiple returns ]] + return x + 1 + --\\ +end +return( f( 100 ) ) +assert( a == b ) +do return f( 11 ) end ]=] +s = string.gsub(s, ' ', '\n\n') -- change all spaces for newlines +prepfile(s) +RUN([[lua -e"_PROMPT='' _PROMPT2=''" -i < %s > %s]], prog, out) +checkprogout("101\n13\t22\n\n") + +prepfile[[#comment in 1st line without \n at the end]] +RUN('lua %s', prog) + +prepfile[[#test line number when file starts with comment line +debug = require"debug" +print(debug.getinfo(1).currentline) +]] +RUN('lua %s > %s', prog, out) +checkprogout('3') + +-- close Lua with an open file +prepfile(string.format([[io.output(%q); io.write('alo')]], out)) +RUN('lua %s', prog) +checkout('alo') + +-- bug in 5.2 beta (extra \0 after version line) +RUN([[lua -v -e"print'hello'" > %s]], out) +t = getoutput() +assert(string.find(t, "PUC%-Rio\nhello")) + + +-- testing os.exit +prepfile("os.exit(nil, true)") +RUN('lua %s', prog) +prepfile("os.exit(0, true)") +RUN('lua %s', prog) +prepfile("os.exit(true, true)") +RUN('lua %s', prog) +prepfile("os.exit(1, true)") +NoRun("", "lua %s", prog) -- no message +prepfile("os.exit(false, true)") +NoRun("", "lua %s", prog) -- no message + +-- remove temporary files +assert(os.remove(prog)) +assert(os.remove(otherprog)) +assert(not os.remove(out)) + +-- invalid options +NoRun("unrecognized option '-h'", "lua -h") +NoRun("unrecognized option '---'", "lua ---") +NoRun("unrecognized option '-Ex'", "lua -Ex") +NoRun("unrecognized option '-vv'", "lua -vv") +NoRun("unrecognized option '-iv'", "lua -iv") +NoRun("'-e' needs argument", "lua -e") +NoRun("syntax error", "lua -e a") +NoRun("'-l' needs argument", "lua -l") + + +if T then -- auxiliary library? + print("testing 'not enough memory' to create a state") + NoRun("not enough memory", "env MEMLIMIT=100 lua") +end +print('+') + +print('testing Ctrl C') +do + -- interrupt a script + local function kill (pid) + return os.execute(string.format('kill -INT %d 2> /dev/null', pid)) + end + + -- function to run a script in background, returning its output file + -- descriptor and its pid + local function runback (luaprg) + -- shell script to run 'luaprg' in background and echo its pid + local shellprg = string.format('%s -e "%s" & echo $!', progname, luaprg) + local f = io.popen(shellprg, "r") -- run shell script + local pid = f:read() -- get pid for Lua script + print("(if test fails now, it may leave a Lua script running in \z + background, pid " .. pid .. ")") + return f, pid + end + + -- Lua script that runs protected infinite loop and then prints '42' + local f, pid = runback[[ + pcall(function () print(12); while true do end end); print(42)]] + -- wait until script is inside 'pcall' + assert(f:read() == "12") + kill(pid) -- send INT signal to Lua script + -- check that 'pcall' captured the exception and script continued running + assert(f:read() == "42") -- expected output + assert(f:close()) + print("done") + + -- Lua script in a long unbreakable search + local f, pid = runback[[ + print(15); string.find(string.rep('a', 100000), '.*b')]] + -- wait (so script can reach the loop) + assert(f:read() == "15") + assert(os.execute("sleep 1")) + -- must send at least two INT signals to stop this Lua script + local n = 100 + for i = 0, 100 do -- keep sending signals + if not kill(pid) then -- until it fails + n = i -- number of non-failed kills + break + end + end + assert(f:close()) + assert(n >= 2) + print(string.format("done (with %d kills)", n)) + +end + +print("OK") diff --git a/06/parser-gen/parsers/lua-5.3.4-tests/math.lua b/06/parser-gen/parsers/lua-5.3.4-tests/math.lua new file mode 100644 index 0000000..53ce9b5 --- /dev/null +++ b/06/parser-gen/parsers/lua-5.3.4-tests/math.lua @@ -0,0 +1,824 @@ +-- $Id: math.lua,v 1.78 2016/11/07 13:11:28 roberto Exp $ +-- See Copyright Notice in file all.lua + +print("testing numbers and math lib") + +local minint = math.mininteger +local maxint = math.maxinteger + +local intbits = math.floor(math.log(maxint, 2) + 0.5) + 1 +assert((1 << intbits) == 0) + +assert(minint == 1 << (intbits - 1)) +assert(maxint == minint - 1) + +-- number of bits in the mantissa of a floating-point number +local floatbits = 24 +do + local p = 2.0^floatbits + while p < p + 1.0 do + p = p * 2.0 + floatbits = floatbits + 1 + end +end + +local function isNaN (x) + return (x ~= x) +end + +assert(isNaN(0/0)) +assert(not isNaN(1/0)) + + +do + local x = 2.0^floatbits + assert(x > x - 1.0 and x == x + 1.0) + + print(string.format("%d-bit integers, %d-bit (mantissa) floats", + intbits, floatbits)) +end + +assert(math.type(0) == "integer" and math.type(0.0) == "float" + and math.type("10") == nil) + + +local function checkerror (msg, f, ...) + local s, err = pcall(f, ...) + assert(not s and string.find(err, msg)) +end + +local msgf2i = "number.* has no integer representation" + +-- float equality +function eq (a,b,limit) + if not limit then + if floatbits >= 50 then limit = 1E-11 + else limit = 1E-5 + end + end + -- a == b needed for +inf/-inf + return a == b or math.abs(a-b) <= limit +end + + +-- equality with types +function eqT (a,b) + return a == b and math.type(a) == math.type(b) +end + + +-- basic float notation +assert(0e12 == 0 and .0 == 0 and 0. == 0 and .2e2 == 20 and 2.E-1 == 0.2) + +do + local a,b,c = "2", " 3e0 ", " 10 " + assert(a+b == 5 and -b == -3 and b+"2" == 5 and "10"-c == 0) + assert(type(a) == 'string' and type(b) == 'string' and type(c) == 'string') + assert(a == "2" and b == " 3e0 " and c == " 10 " and -c == -" 10 ") + assert(c%a == 0 and a^b == 08) + a = 0 + assert(a == -a and 0 == -0) +end + +do + local x = -1 + local mz = 0/x -- minus zero + t = {[0] = 10, 20, 30, 40, 50} + assert(t[mz] == t[0] and t[-0] == t[0]) +end + +do -- tests for 'modf' + local a,b = math.modf(3.5) + assert(a == 3.0 and b == 0.5) + a,b = math.modf(-2.5) + assert(a == -2.0 and b == -0.5) + a,b = math.modf(-3e23) + assert(a == -3e23 and b == 0.0) + a,b = math.modf(3e35) + assert(a == 3e35 and b == 0.0) + a,b = math.modf(-1/0) -- -inf + assert(a == -1/0 and b == 0.0) + a,b = math.modf(1/0) -- inf + assert(a == 1/0 and b == 0.0) + a,b = math.modf(0/0) -- NaN + assert(isNaN(a) and isNaN(b)) + a,b = math.modf(3) -- integer argument + assert(eqT(a, 3) and eqT(b, 0.0)) + a,b = math.modf(minint) + assert(eqT(a, minint) and eqT(b, 0.0)) +end + +assert(math.huge > 10e30) +assert(-math.huge < -10e30) + + +-- integer arithmetic +assert(minint < minint + 1) +assert(maxint - 1 < maxint) +assert(0 - minint == minint) +assert(minint * minint == 0) +assert(maxint * maxint * maxint == maxint) + + +-- testing floor division and conversions + +for _, i in pairs{-16, -15, -3, -2, -1, 0, 1, 2, 3, 15} do + for _, j in pairs{-16, -15, -3, -2, -1, 1, 2, 3, 15} do + for _, ti in pairs{0, 0.0} do -- try 'i' as integer and as float + for _, tj in pairs{0, 0.0} do -- try 'j' as integer and as float + local x = i + ti + local y = j + tj + assert(i//j == math.floor(i/j)) + end + end + end +end + +assert(1//0.0 == 1/0) +assert(-1 // 0.0 == -1/0) +assert(eqT(3.5 // 1.5, 2.0)) +assert(eqT(3.5 // -1.5, -3.0)) + +assert(maxint // maxint == 1) +assert(maxint // 1 == maxint) +assert((maxint - 1) // maxint == 0) +assert(maxint // (maxint - 1) == 1) +assert(minint // minint == 1) +assert(minint // minint == 1) +assert((minint + 1) // minint == 0) +assert(minint // (minint + 1) == 1) +assert(minint // 1 == minint) + +assert(minint // -1 == -minint) +assert(minint // -2 == 2^(intbits - 2)) +assert(maxint // -1 == -maxint) + + +-- negative exponents +do + assert(2^-3 == 1 / 2^3) + assert(eq((-3)^-3, 1 / (-3)^3)) + for i = -3, 3 do -- variables avoid constant folding + for j = -3, 3 do + -- domain errors (0^(-n)) are not portable + if not _port or i ~= 0 or j > 0 then + assert(eq(i^j, 1 / i^(-j))) + end + end + end +end + +-- comparison between floats and integers (border cases) +if floatbits < intbits then + assert(2.0^floatbits == (1 << floatbits)) + assert(2.0^floatbits - 1.0 == (1 << floatbits) - 1.0) + assert(2.0^floatbits - 1.0 ~= (1 << floatbits)) + -- float is rounded, int is not + assert(2.0^floatbits + 1.0 ~= (1 << floatbits) + 1) +else -- floats can express all integers with full accuracy + assert(maxint == maxint + 0.0) + assert(maxint - 1 == maxint - 1.0) + assert(minint + 1 == minint + 1.0) + assert(maxint ~= maxint - 1.0) +end +assert(maxint + 0.0 == 2.0^(intbits - 1) - 1.0) +assert(minint + 0.0 == minint) +assert(minint + 0.0 == -2.0^(intbits - 1)) + + +-- order between floats and integers +assert(1 < 1.1); assert(not (1 < 0.9)) +assert(1 <= 1.1); assert(not (1 <= 0.9)) +assert(-1 < -0.9); assert(not (-1 < -1.1)) +assert(1 <= 1.1); assert(not (-1 <= -1.1)) +assert(-1 < -0.9); assert(not (-1 < -1.1)) +assert(-1 <= -0.9); assert(not (-1 <= -1.1)) +assert(minint <= minint + 0.0) +assert(minint + 0.0 <= minint) +assert(not (minint < minint + 0.0)) +assert(not (minint + 0.0 < minint)) +assert(maxint < minint * -1.0) +assert(maxint <= minint * -1.0) + +do + local fmaxi1 = 2^(intbits - 1) + assert(maxint < fmaxi1) + assert(maxint <= fmaxi1) + assert(not (fmaxi1 <= maxint)) + assert(minint <= -2^(intbits - 1)) + assert(-2^(intbits - 1) <= minint) +end + +if floatbits < intbits then + print("testing order (floats cannot represent all integers)") + local fmax = 2^floatbits + local ifmax = fmax | 0 + assert(fmax < ifmax + 1) + assert(fmax - 1 < ifmax) + assert(-(fmax - 1) > -ifmax) + assert(not (fmax <= ifmax - 1)) + assert(-fmax > -(ifmax + 1)) + assert(not (-fmax >= -(ifmax - 1))) + + assert(fmax/2 - 0.5 < ifmax//2) + assert(-(fmax/2 - 0.5) > -ifmax//2) + + assert(maxint < 2^intbits) + assert(minint > -2^intbits) + assert(maxint <= 2^intbits) + assert(minint >= -2^intbits) +else + print("testing order (floats can represent all integers)") + assert(maxint < maxint + 1.0) + assert(maxint < maxint + 0.5) + assert(maxint - 1.0 < maxint) + assert(maxint - 0.5 < maxint) + assert(not (maxint + 0.0 < maxint)) + assert(maxint + 0.0 <= maxint) + assert(not (maxint < maxint + 0.0)) + assert(maxint + 0.0 <= maxint) + assert(maxint <= maxint + 0.0) + assert(not (maxint + 1.0 <= maxint)) + assert(not (maxint + 0.5 <= maxint)) + assert(not (maxint <= maxint - 1.0)) + assert(not (maxint <= maxint - 0.5)) + + assert(minint < minint + 1.0) + assert(minint < minint + 0.5) + assert(minint <= minint + 0.5) + assert(minint - 1.0 < minint) + assert(minint - 1.0 <= minint) + assert(not (minint + 0.0 < minint)) + assert(not (minint + 0.5 < minint)) + assert(not (minint < minint + 0.0)) + assert(minint + 0.0 <= minint) + assert(minint <= minint + 0.0) + assert(not (minint + 1.0 <= minint)) + assert(not (minint + 0.5 <= minint)) + assert(not (minint <= minint - 1.0)) +end + +do + local NaN = 0/0 + assert(not (NaN < 0)) + assert(not (NaN > minint)) + assert(not (NaN <= -9)) + assert(not (NaN <= maxint)) + assert(not (NaN < maxint)) + assert(not (minint <= NaN)) + assert(not (minint < NaN)) +end + + +-- avoiding errors at compile time +local function checkcompt (msg, code) + checkerror(msg, assert(load(code))) +end +checkcompt("divide by zero", "return 2 // 0") +checkcompt(msgf2i, "return 2.3 >> 0") +checkcompt(msgf2i, ("return 2.0^%d & 1"):format(intbits - 1)) +checkcompt("field 'huge'", "return math.huge << 1") +checkcompt(msgf2i, ("return 1 | 2.0^%d"):format(intbits - 1)) +checkcompt(msgf2i, "return 2.3 ~ '0.0'") + + +-- testing overflow errors when converting from float to integer (runtime) +local function f2i (x) return x | x end +checkerror(msgf2i, f2i, math.huge) -- +inf +checkerror(msgf2i, f2i, -math.huge) -- -inf +checkerror(msgf2i, f2i, 0/0) -- NaN + +if floatbits < intbits then + -- conversion tests when float cannot represent all integers + assert(maxint + 1.0 == maxint + 0.0) + assert(minint - 1.0 == minint + 0.0) + checkerror(msgf2i, f2i, maxint + 0.0) + assert(f2i(2.0^(intbits - 2)) == 1 << (intbits - 2)) + assert(f2i(-2.0^(intbits - 2)) == -(1 << (intbits - 2))) + assert((2.0^(floatbits - 1) + 1.0) // 1 == (1 << (floatbits - 1)) + 1) + -- maximum integer representable as a float + local mf = maxint - (1 << (floatbits - intbits)) + 1 + assert(f2i(mf + 0.0) == mf) -- OK up to here + mf = mf + 1 + assert(f2i(mf + 0.0) ~= mf) -- no more representable +else + -- conversion tests when float can represent all integers + assert(maxint + 1.0 > maxint) + assert(minint - 1.0 < minint) + assert(f2i(maxint + 0.0) == maxint) + checkerror("no integer rep", f2i, maxint + 1.0) + checkerror("no integer rep", f2i, minint - 1.0) +end + +-- 'minint' should be representable as a float no matter the precision +assert(f2i(minint + 0.0) == minint) + + +-- testing numeric strings + +assert("2" + 1 == 3) +assert("2 " + 1 == 3) +assert(" -2 " + 1 == -1) +assert(" -0xa " + 1 == -9) + + +-- Literal integer Overflows (new behavior in 5.3.3) +do + -- no overflows + assert(eqT(tonumber(tostring(maxint)), maxint)) + assert(eqT(tonumber(tostring(minint)), minint)) + + -- add 1 to last digit as a string (it cannot be 9...) + local function incd (n) + local s = string.format("%d", n) + s = string.gsub(s, "%d$", function (d) + assert(d ~= '9') + return string.char(string.byte(d) + 1) + end) + return s + end + + -- 'tonumber' with overflow by 1 + assert(eqT(tonumber(incd(maxint)), maxint + 1.0)) + assert(eqT(tonumber(incd(minint)), minint - 1.0)) + + -- large numbers + assert(eqT(tonumber("1"..string.rep("0", 30)), 1e30)) + assert(eqT(tonumber("-1"..string.rep("0", 30)), -1e30)) + + -- hexa format still wraps around + assert(eqT(tonumber("0x1"..string.rep("0", 30)), 0)) + + -- lexer in the limits + assert(minint == load("return " .. minint)()) + assert(eqT(maxint, load("return " .. maxint)())) + + assert(eqT(10000000000000000000000.0, 10000000000000000000000)) + assert(eqT(-10000000000000000000000.0, -10000000000000000000000)) +end + + +-- testing 'tonumber' + +-- 'tonumber' with numbers +assert(tonumber(3.4) == 3.4) +assert(eqT(tonumber(3), 3)) +assert(eqT(tonumber(maxint), maxint) and eqT(tonumber(minint), minint)) +assert(tonumber(1/0) == 1/0) + +-- 'tonumber' with strings +assert(tonumber("0") == 0) +assert(tonumber("") == nil) +assert(tonumber(" ") == nil) +assert(tonumber("-") == nil) +assert(tonumber(" -0x ") == nil) +assert(tonumber{} == nil) +assert(tonumber'+0.01' == 1/100 and tonumber'+.01' == 0.01 and + tonumber'.01' == 0.01 and tonumber'-1.' == -1 and + tonumber'+1.' == 1) +assert(tonumber'+ 0.01' == nil and tonumber'+.e1' == nil and + tonumber'1e' == nil and tonumber'1.0e+' == nil and + tonumber'.' == nil) +assert(tonumber('-012') == -010-2) +assert(tonumber('-1.2e2') == - - -120) + +assert(tonumber("0xffffffffffff") == (1 << (4*12)) - 1) +assert(tonumber("0x"..string.rep("f", (intbits//4))) == -1) +assert(tonumber("-0x"..string.rep("f", (intbits//4))) == 1) + +-- testing 'tonumber' with base +assert(tonumber(' 001010 ', 2) == 10) +assert(tonumber(' 001010 ', 10) == 001010) +assert(tonumber(' -1010 ', 2) == -10) +assert(tonumber('10', 36) == 36) +assert(tonumber(' -10 ', 36) == -36) +assert(tonumber(' +1Z ', 36) == 36 + 35) +assert(tonumber(' -1z ', 36) == -36 + -35) +assert(tonumber('-fFfa', 16) == -(10+(16*(15+(16*(15+(16*15))))))) +assert(tonumber(string.rep('1', (intbits - 2)), 2) + 1 == 2^(intbits - 2)) +assert(tonumber('ffffFFFF', 16)+1 == (1 << 32)) +assert(tonumber('0ffffFFFF', 16)+1 == (1 << 32)) +assert(tonumber('-0ffffffFFFF', 16) - 1 == -(1 << 40)) +for i = 2,36 do + local i2 = i * i + local i10 = i2 * i2 * i2 * i2 * i2 -- i^10 + assert(tonumber('\t10000000000\t', i) == i10) +end + +if not _soft then + -- tests with very long numerals + assert(tonumber("0x"..string.rep("f", 13)..".0") == 2.0^(4*13) - 1) + assert(tonumber("0x"..string.rep("f", 150)..".0") == 2.0^(4*150) - 1) + assert(tonumber("0x"..string.rep("f", 300)..".0") == 2.0^(4*300) - 1) + assert(tonumber("0x"..string.rep("f", 500)..".0") == 2.0^(4*500) - 1) + assert(tonumber('0x3.' .. string.rep('0', 1000)) == 3) + assert(tonumber('0x' .. string.rep('0', 1000) .. 'a') == 10) + assert(tonumber('0x0.' .. string.rep('0', 13).."1") == 2.0^(-4*14)) + assert(tonumber('0x0.' .. string.rep('0', 150).."1") == 2.0^(-4*151)) + assert(tonumber('0x0.' .. string.rep('0', 300).."1") == 2.0^(-4*301)) + assert(tonumber('0x0.' .. string.rep('0', 500).."1") == 2.0^(-4*501)) + + assert(tonumber('0xe03' .. string.rep('0', 1000) .. 'p-4000') == 3587.0) + assert(tonumber('0x.' .. string.rep('0', 1000) .. '74p4004') == 0x7.4) +end + +-- testing 'tonumber' for invalid formats + +local function f (...) + if select('#', ...) == 1 then + return (...) + else + return "***" + end +end + +assert(f(tonumber('fFfa', 15)) == nil) +assert(f(tonumber('099', 8)) == nil) +assert(f(tonumber('1\0', 2)) == nil) +assert(f(tonumber('', 8)) == nil) +assert(f(tonumber(' ', 9)) == nil) +assert(f(tonumber(' ', 9)) == nil) +assert(f(tonumber('0xf', 10)) == nil) + +assert(f(tonumber('inf')) == nil) +assert(f(tonumber(' INF ')) == nil) +assert(f(tonumber('Nan')) == nil) +assert(f(tonumber('nan')) == nil) + +assert(f(tonumber(' ')) == nil) +assert(f(tonumber('')) == nil) +assert(f(tonumber('1 a')) == nil) +assert(f(tonumber('1 a', 2)) == nil) +assert(f(tonumber('1\0')) == nil) +assert(f(tonumber('1 \0')) == nil) +assert(f(tonumber('1\0 ')) == nil) +assert(f(tonumber('e1')) == nil) +assert(f(tonumber('e 1')) == nil) +assert(f(tonumber(' 3.4.5 ')) == nil) + + +-- testing 'tonumber' for invalid hexadecimal formats + +assert(tonumber('0x') == nil) +assert(tonumber('x') == nil) +assert(tonumber('x3') == nil) +assert(tonumber('0x3.3.3') == nil) -- two decimal points +assert(tonumber('00x2') == nil) +assert(tonumber('0x 2') == nil) +assert(tonumber('0 x2') == nil) +assert(tonumber('23x') == nil) +assert(tonumber('- 0xaa') == nil) +assert(tonumber('-0xaaP ') == nil) -- no exponent +assert(tonumber('0x0.51p') == nil) +assert(tonumber('0x5p+-2') == nil) + + +-- testing hexadecimal numerals + +assert(0x10 == 16 and 0xfff == 2^12 - 1 and 0XFB == 251) +assert(0x0p12 == 0 and 0x.0p-3 == 0) +assert(0xFFFFFFFF == (1 << 32) - 1) +assert(tonumber('+0x2') == 2) +assert(tonumber('-0xaA') == -170) +assert(tonumber('-0xffFFFfff') == -(1 << 32) + 1) + +-- possible confusion with decimal exponent +assert(0E+1 == 0 and 0xE+1 == 15 and 0xe-1 == 13) + + +-- floating hexas + +assert(tonumber(' 0x2.5 ') == 0x25/16) +assert(tonumber(' -0x2.5 ') == -0x25/16) +assert(tonumber(' +0x0.51p+8 ') == 0x51) +assert(0x.FfffFFFF == 1 - '0x.00000001') +assert('0xA.a' + 0 == 10 + 10/16) +assert(0xa.aP4 == 0XAA) +assert(0x4P-2 == 1) +assert(0x1.1 == '0x1.' + '+0x.1') +assert(0Xabcdef.0 == 0x.ABCDEFp+24) + + +assert(1.1 == 1.+.1) +assert(100.0 == 1E2 and .01 == 1e-2) +assert(1111111111 - 1111111110 == 1000.00e-03) +assert(1.1 == '1.'+'.1') +assert(tonumber'1111111111' - tonumber'1111111110' == + tonumber" +0.001e+3 \n\t") + +assert(0.1e-30 > 0.9E-31 and 0.9E30 < 0.1e31) + +assert(0.123456 > 0.123455) + +assert(tonumber('+1.23E18') == 1.23*10.0^18) + +-- testing order operators +assert(not(1<1) and (1<2) and not(2<1)) +assert(not('a'<'a') and ('a'<'b') and not('b'<'a')) +assert((1<=1) and (1<=2) and not(2<=1)) +assert(('a'<='a') and ('a'<='b') and not('b'<='a')) +assert(not(1>1) and not(1>2) and (2>1)) +assert(not('a'>'a') and not('a'>'b') and ('b'>'a')) +assert((1>=1) and not(1>=2) and (2>=1)) +assert(('a'>='a') and not('a'>='b') and ('b'>='a')) +assert(1.3 < 1.4 and 1.3 <= 1.4 and not (1.3 < 1.3) and 1.3 <= 1.3) + +-- testing mod operator +assert(eqT(-4 % 3, 2)) +assert(eqT(4 % -3, -2)) +assert(eqT(-4.0 % 3, 2.0)) +assert(eqT(4 % -3.0, -2.0)) +assert(math.pi - math.pi % 1 == 3) +assert(math.pi - math.pi % 0.001 == 3.141) + +assert(eqT(minint % minint, 0)) +assert(eqT(maxint % maxint, 0)) +assert((minint + 1) % minint == minint + 1) +assert((maxint - 1) % maxint == maxint - 1) +assert(minint % maxint == maxint - 1) + +assert(minint % -1 == 0) +assert(minint % -2 == 0) +assert(maxint % -2 == -1) + +-- non-portable tests because Windows C library cannot compute +-- fmod(1, huge) correctly +if not _port then + local function anan (x) assert(isNaN(x)) end -- assert Not a Number + anan(0.0 % 0) + anan(1.3 % 0) + anan(math.huge % 1) + anan(math.huge % 1e30) + anan(-math.huge % 1e30) + anan(-math.huge % -1e30) + assert(1 % math.huge == 1) + assert(1e30 % math.huge == 1e30) + assert(1e30 % -math.huge == -math.huge) + assert(-1 % math.huge == math.huge) + assert(-1 % -math.huge == -1) +end + + +-- testing unsigned comparisons +assert(math.ult(3, 4)) +assert(not math.ult(4, 4)) +assert(math.ult(-2, -1)) +assert(math.ult(2, -1)) +assert(not math.ult(-2, -2)) +assert(math.ult(maxint, minint)) +assert(not math.ult(minint, maxint)) + + +assert(eq(math.sin(-9.8)^2 + math.cos(-9.8)^2, 1)) +assert(eq(math.tan(math.pi/4), 1)) +assert(eq(math.sin(math.pi/2), 1) and eq(math.cos(math.pi/2), 0)) +assert(eq(math.atan(1), math.pi/4) and eq(math.acos(0), math.pi/2) and + eq(math.asin(1), math.pi/2)) +assert(eq(math.deg(math.pi/2), 90) and eq(math.rad(90), math.pi/2)) +assert(math.abs(-10.43) == 10.43) +assert(eqT(math.abs(minint), minint)) +assert(eqT(math.abs(maxint), maxint)) +assert(eqT(math.abs(-maxint), maxint)) +assert(eq(math.atan(1,0), math.pi/2)) +assert(math.fmod(10,3) == 1) +assert(eq(math.sqrt(10)^2, 10)) +assert(eq(math.log(2, 10), math.log(2)/math.log(10))) +assert(eq(math.log(2, 2), 1)) +assert(eq(math.log(9, 3), 2)) +assert(eq(math.exp(0), 1)) +assert(eq(math.sin(10), math.sin(10%(2*math.pi)))) + + +assert(tonumber(' 1.3e-2 ') == 1.3e-2) +assert(tonumber(' -1.00000000000001 ') == -1.00000000000001) + +-- testing constant limits +-- 2^23 = 8388608 +assert(8388609 + -8388609 == 0) +assert(8388608 + -8388608 == 0) +assert(8388607 + -8388607 == 0) + + + +do -- testing floor & ceil + assert(eqT(math.floor(3.4), 3)) + assert(eqT(math.ceil(3.4), 4)) + assert(eqT(math.floor(-3.4), -4)) + assert(eqT(math.ceil(-3.4), -3)) + assert(eqT(math.floor(maxint), maxint)) + assert(eqT(math.ceil(maxint), maxint)) + assert(eqT(math.floor(minint), minint)) + assert(eqT(math.floor(minint + 0.0), minint)) + assert(eqT(math.ceil(minint), minint)) + assert(eqT(math.ceil(minint + 0.0), minint)) + assert(math.floor(1e50) == 1e50) + assert(math.ceil(1e50) == 1e50) + assert(math.floor(-1e50) == -1e50) + assert(math.ceil(-1e50) == -1e50) + for _, p in pairs{31,32,63,64} do + assert(math.floor(2^p) == 2^p) + assert(math.floor(2^p + 0.5) == 2^p) + assert(math.ceil(2^p) == 2^p) + assert(math.ceil(2^p - 0.5) == 2^p) + end + checkerror("number expected", math.floor, {}) + checkerror("number expected", math.ceil, print) + assert(eqT(math.tointeger(minint), minint)) + assert(eqT(math.tointeger(minint .. ""), minint)) + assert(eqT(math.tointeger(maxint), maxint)) + assert(eqT(math.tointeger(maxint .. ""), maxint)) + assert(eqT(math.tointeger(minint + 0.0), minint)) + assert(math.tointeger(0.0 - minint) == nil) + assert(math.tointeger(math.pi) == nil) + assert(math.tointeger(-math.pi) == nil) + assert(math.floor(math.huge) == math.huge) + assert(math.ceil(math.huge) == math.huge) + assert(math.tointeger(math.huge) == nil) + assert(math.floor(-math.huge) == -math.huge) + assert(math.ceil(-math.huge) == -math.huge) + assert(math.tointeger(-math.huge) == nil) + assert(math.tointeger("34.0") == 34) + assert(math.tointeger("34.3") == nil) + assert(math.tointeger({}) == nil) + assert(math.tointeger(0/0) == nil) -- NaN +end + + +-- testing fmod for integers +for i = -6, 6 do + for j = -6, 6 do + if j ~= 0 then + local mi = math.fmod(i, j) + local mf = math.fmod(i + 0.0, j) + assert(mi == mf) + assert(math.type(mi) == 'integer' and math.type(mf) == 'float') + if (i >= 0 and j >= 0) or (i <= 0 and j <= 0) or mi == 0 then + assert(eqT(mi, i % j)) + end + end + end +end +assert(eqT(math.fmod(minint, minint), 0)) +assert(eqT(math.fmod(maxint, maxint), 0)) +assert(eqT(math.fmod(minint + 1, minint), minint + 1)) +assert(eqT(math.fmod(maxint - 1, maxint), maxint - 1)) + +checkerror("zero", math.fmod, 3, 0) + + +do -- testing max/min + checkerror("value expected", math.max) + checkerror("value expected", math.min) + assert(eqT(math.max(3), 3)) + assert(eqT(math.max(3, 5, 9, 1), 9)) + assert(math.max(maxint, 10e60) == 10e60) + assert(eqT(math.max(minint, minint + 1), minint + 1)) + assert(eqT(math.min(3), 3)) + assert(eqT(math.min(3, 5, 9, 1), 1)) + assert(math.min(3.2, 5.9, -9.2, 1.1) == -9.2) + assert(math.min(1.9, 1.7, 1.72) == 1.7) + assert(math.min(-10e60, minint) == -10e60) + assert(eqT(math.min(maxint, maxint - 1), maxint - 1)) + assert(eqT(math.min(maxint - 2, maxint, maxint - 1), maxint - 2)) +end +-- testing implicit convertions + +local a,b = '10', '20' +assert(a*b == 200 and a+b == 30 and a-b == -10 and a/b == 0.5 and -b == -20) +assert(a == '10' and b == '20') + + +do + print("testing -0 and NaN") + local mz, z = -0.0, 0.0 + assert(mz == z) + assert(1/mz < 0 and 0 < 1/z) + local a = {[mz] = 1} + assert(a[z] == 1 and a[mz] == 1) + a[z] = 2 + assert(a[z] == 2 and a[mz] == 2) + local inf = math.huge * 2 + 1 + mz, z = -1/inf, 1/inf + assert(mz == z) + assert(1/mz < 0 and 0 < 1/z) + local NaN = inf - inf + assert(NaN ~= NaN) + assert(not (NaN < NaN)) + assert(not (NaN <= NaN)) + assert(not (NaN > NaN)) + assert(not (NaN >= NaN)) + assert(not (0 < NaN) and not (NaN < 0)) + local NaN1 = 0/0 + assert(NaN ~= NaN1 and not (NaN <= NaN1) and not (NaN1 <= NaN)) + local a = {} + assert(not pcall(rawset, a, NaN, 1)) + assert(a[NaN] == nil) + a[1] = 1 + assert(not pcall(rawset, a, NaN, 1)) + assert(a[NaN] == nil) + -- strings with same binary representation as 0.0 (might create problems + -- for constant manipulation in the pre-compiler) + local a1, a2, a3, a4, a5 = 0, 0, "\0\0\0\0\0\0\0\0", 0, "\0\0\0\0\0\0\0\0" + assert(a1 == a2 and a2 == a4 and a1 ~= a3) + assert(a3 == a5) +end + + +print("testing 'math.random'") +math.randomseed(0) + +do -- test random for floats + local max = -math.huge + local min = math.huge + for i = 0, 20000 do + local t = math.random() + assert(0 <= t and t < 1) + max = math.max(max, t) + min = math.min(min, t) + if eq(max, 1, 0.001) and eq(min, 0, 0.001) then + goto ok + end + end + -- loop ended without satisfing condition + assert(false) + ::ok:: +end + +do + local function aux (p, lim) -- test random for small intervals + local x1, x2 + if #p == 1 then x1 = 1; x2 = p[1] + else x1 = p[1]; x2 = p[2] + end + local mark = {}; local count = 0 -- to check that all values appeared + for i = 0, lim or 2000 do + local t = math.random(table.unpack(p)) + assert(x1 <= t and t <= x2) + if not mark[t] then -- new value + mark[t] = true + count = count + 1 + end + if count == x2 - x1 + 1 then -- all values appeared; OK + goto ok + end + end + -- loop ended without satisfing condition + assert(false) + ::ok:: + end + + aux({-10,0}) + aux({6}) + aux({-10, 10}) + aux({minint, minint}) + aux({maxint, maxint}) + aux({minint, minint + 9}) + aux({maxint - 3, maxint}) +end + +do + local function aux(p1, p2) -- test random for large intervals + local max = minint + local min = maxint + local n = 200 + local mark = {}; local count = 0 -- to count how many different values + for _ = 1, n do + local t = math.random(p1, p2) + max = math.max(max, t) + min = math.min(min, t) + if not mark[t] then -- new value + mark[t] = true + count = count + 1 + end + end + -- at least 80% of values are different + assert(count >= n * 0.8) + -- min and max not too far from formal min and max + local diff = (p2 - p1) // 8 + assert(min < p1 + diff and max > p2 - diff) + end + aux(0, maxint) + aux(1, maxint) + aux(minint, -1) + aux(minint // 2, maxint // 2) +end + +for i=1,100 do + assert(math.random(maxint) > 0) + assert(math.random(minint, -1) < 0) +end + +assert(not pcall(math.random, 1, 2, 3)) -- too many arguments + +-- empty interval +assert(not pcall(math.random, minint + 1, minint)) +assert(not pcall(math.random, maxint, maxint - 1)) +assert(not pcall(math.random, maxint, minint)) + +-- interval too large +assert(not pcall(math.random, minint, 0)) +assert(not pcall(math.random, -1, maxint)) +assert(not pcall(math.random, minint // 2, maxint // 2 + 1)) + + +print('OK') diff --git a/06/parser-gen/parsers/lua-5.3.4-tests/nextvar.lua b/06/parser-gen/parsers/lua-5.3.4-tests/nextvar.lua new file mode 100644 index 0000000..ce7312e --- /dev/null +++ b/06/parser-gen/parsers/lua-5.3.4-tests/nextvar.lua @@ -0,0 +1,631 @@ +-- $Id: nextvar.lua,v 1.79 2016/11/07 13:11:28 roberto Exp $ +-- See Copyright Notice in file all.lua + +print('testing tables, next, and for') + +local function checkerror (msg, f, ...) + local s, err = pcall(f, ...) + assert(not s and string.find(err, msg)) +end + + +local a = {} + +-- make sure table has lots of space in hash part +for i=1,100 do a[i.."+"] = true end +for i=1,100 do a[i.."+"] = nil end +-- fill hash part with numeric indices testing size operator +for i=1,100 do + a[i] = true + assert(#a == i) +end + +-- testing ipairs +local x = 0 +for k,v in ipairs{10,20,30;x=12} do + x = x + 1 + assert(k == x and v == x * 10) +end + +for _ in ipairs{x=12, y=24} do assert(nil) end + +-- test for 'false' x ipair +x = false +local i = 0 +for k,v in ipairs{true,false,true,false} do + i = i + 1 + x = not x + assert(x == v) +end +assert(i == 4) + +-- iterator function is always the same +assert(type(ipairs{}) == 'function' and ipairs{} == ipairs{}) + + +if not T then + (Message or print) + ('\n >>> testC not active: skipping tests for table sizes <<<\n') +else --[ +-- testing table sizes + +local function log2 (x) return math.log(x, 2) end + +local function mp2 (n) -- minimum power of 2 >= n + local mp = 2^math.ceil(log2(n)) + assert(n == 0 or (mp/2 < n and n <= mp)) + return mp +end + +local function fb (n) + local r, nn = T.int2fb(n) + assert(r < 256) + return nn +end + +-- test fb function +for a = 1, 10000 do -- all numbers up to 10^4 + local n = fb(a) + assert(a <= n and n <= a*1.125) +end +local a = 1024 -- plus a few up to 2 ^30 +local lim = 2^30 +while a < lim do + local n = fb(a) + assert(a <= n and n <= a*1.125) + a = math.ceil(a*1.3) +end + + +local function check (t, na, nh) + local a, h = T.querytab(t) + if a ~= na or h ~= nh then + print(na, nh, a, h) + assert(nil) + end +end + + +-- testing C library sizes +do + local s = 0 + for _ in pairs(math) do s = s + 1 end + check(math, 0, mp2(s)) +end + + +-- testing constructor sizes +local lim = 40 +local s = 'return {' +for i=1,lim do + s = s..i..',' + local s = s + for k=0,lim do + local t = load(s..'}', '')() + assert(#t == i) + check(t, fb(i), mp2(k)) + s = string.format('%sa%d=%d,', s, k, k) + end +end + + +-- tests with unknown number of elements +local a = {} +for i=1,lim do a[i] = i end -- build auxiliary table +for k=0,lim do + local a = {table.unpack(a,1,k)} + assert(#a == k) + check(a, k, 0) + a = {1,2,3,table.unpack(a,1,k)} + check(a, k+3, 0) + assert(#a == k + 3) +end + + +-- testing tables dynamically built +local lim = 130 +local a = {}; a[2] = 1; check(a, 0, 1) +a = {}; a[0] = 1; check(a, 0, 1); a[2] = 1; check(a, 0, 2) +a = {}; a[0] = 1; a[1] = 1; check(a, 1, 1) +a = {} +for i = 1,lim do + a[i] = 1 + assert(#a == i) + check(a, mp2(i), 0) +end + +a = {} +for i = 1,lim do + a['a'..i] = 1 + assert(#a == 0) + check(a, 0, mp2(i)) +end + +a = {} +for i=1,16 do a[i] = i end +check(a, 16, 0) +do + for i=1,11 do a[i] = nil end + for i=30,50 do a[i] = nil end -- force a rehash (?) + check(a, 0, 8) -- only 5 elements in the table + a[10] = 1 + for i=30,50 do a[i] = nil end -- force a rehash (?) + check(a, 0, 8) -- only 6 elements in the table + for i=1,14 do a[i] = nil end + for i=18,50 do a[i] = nil end -- force a rehash (?) + check(a, 0, 4) -- only 2 elements ([15] and [16]) +end + +-- reverse filling +for i=1,lim do + local a = {} + for i=i,1,-1 do a[i] = i end -- fill in reverse + check(a, mp2(i), 0) +end + +-- size tests for vararg +lim = 35 +function foo (n, ...) + local arg = {...} + check(arg, n, 0) + assert(select('#', ...) == n) + arg[n+1] = true + check(arg, mp2(n+1), 0) + arg.x = true + check(arg, mp2(n+1), 1) +end +local a = {} +for i=1,lim do a[i] = true; foo(i, table.unpack(a)) end + +end --] + + +-- test size operation on empty tables +assert(#{} == 0) +assert(#{nil} == 0) +assert(#{nil, nil} == 0) +assert(#{nil, nil, nil} == 0) +assert(#{nil, nil, nil, nil} == 0) +print'+' + + +local nofind = {} + +a,b,c = 1,2,3 +a,b,c = nil + + +-- next uses always the same iteraction function +assert(next{} == next{}) + +local function find (name) + local n,v + while 1 do + n,v = next(_G, n) + if not n then return nofind end + assert(v ~= nil) + if n == name then return v end + end +end + +local function find1 (name) + for n,v in pairs(_G) do + if n==name then return v end + end + return nil -- not found +end + + +assert(print==find("print") and print == find1("print")) +assert(_G["print"]==find("print")) +assert(assert==find1("assert")) +assert(nofind==find("return")) +assert(not find1("return")) +_G["ret" .. "urn"] = nil +assert(nofind==find("return")) +_G["xxx"] = 1 +assert(xxx==find("xxx")) + +-- invalid key to 'next' +checkerror("invalid key", next, {10,20}, 3) + +-- both 'pairs' and 'ipairs' need an argument +checkerror("bad argument", pairs) +checkerror("bad argument", ipairs) + +print('+') + +a = {} +for i=0,10000 do + if math.fmod(i,10) ~= 0 then + a['x'..i] = i + end +end + +n = {n=0} +for i,v in pairs(a) do + n.n = n.n+1 + assert(i and v and a[i] == v) +end +assert(n.n == 9000) +a = nil + +do -- clear global table + local a = {} + for n,v in pairs(_G) do a[n]=v end + for n,v in pairs(a) do + if not package.loaded[n] and type(v) ~= "function" and + not string.find(n, "^[%u_]") then + _G[n] = nil + end + collectgarbage() + end +end + + +-- + +local function checknext (a) + local b = {} + do local k,v = next(a); while k do b[k] = v; k,v = next(a,k) end end + for k,v in pairs(b) do assert(a[k] == v) end + for k,v in pairs(a) do assert(b[k] == v) end +end + +checknext{1,x=1,y=2,z=3} +checknext{1,2,x=1,y=2,z=3} +checknext{1,2,3,x=1,y=2,z=3} +checknext{1,2,3,4,x=1,y=2,z=3} +checknext{1,2,3,4,5,x=1,y=2,z=3} + +assert(#{} == 0) +assert(#{[-1] = 2} == 0) +assert(#{1,2,3,nil,nil} == 3) +for i=0,40 do + local a = {} + for j=1,i do a[j]=j end + assert(#a == i) +end + +-- 'maxn' is now deprecated, but it is easily defined in Lua +function table.maxn (t) + local max = 0 + for k in pairs(t) do + max = (type(k) == 'number') and math.max(max, k) or max + end + return max +end + +assert(table.maxn{} == 0) +assert(table.maxn{["1000"] = true} == 0) +assert(table.maxn{["1000"] = true, [24.5] = 3} == 24.5) +assert(table.maxn{[1000] = true} == 1000) +assert(table.maxn{[10] = true, [100*math.pi] = print} == 100*math.pi) + +table.maxn = nil + +-- int overflow +a = {} +for i=0,50 do a[2^i] = true end +assert(a[#a]) + +print('+') + + +-- erasing values +local t = {[{1}] = 1, [{2}] = 2, [string.rep("x ", 4)] = 3, + [100.3] = 4, [4] = 5} + +local n = 0 +for k, v in pairs( t ) do + n = n+1 + assert(t[k] == v) + t[k] = nil + collectgarbage() + assert(t[k] == nil) +end +assert(n == 5) + + +local function test (a) + assert(not pcall(table.insert, a, 2, 20)); + table.insert(a, 10); table.insert(a, 2, 20); + table.insert(a, 1, -1); table.insert(a, 40); + table.insert(a, #a+1, 50) + table.insert(a, 2, -2) + assert(not pcall(table.insert, a, 0, 20)); + assert(not pcall(table.insert, a, #a + 2, 20)); + assert(table.remove(a,1) == -1) + assert(table.remove(a,1) == -2) + assert(table.remove(a,1) == 10) + assert(table.remove(a,1) == 20) + assert(table.remove(a,1) == 40) + assert(table.remove(a,1) == 50) + assert(table.remove(a,1) == nil) + assert(table.remove(a) == nil) + assert(table.remove(a, #a) == nil) +end + +a = {n=0, [-7] = "ban"} +test(a) +assert(a.n == 0 and a[-7] == "ban") + +a = {[-7] = "ban"}; +test(a) +assert(a.n == nil and #a == 0 and a[-7] == "ban") + +a = {[-1] = "ban"} +test(a) +assert(#a == 0 and table.remove(a) == nil and a[-1] == "ban") + +a = {[0] = "ban"} +assert(#a == 0 and table.remove(a) == "ban" and a[0] == nil) + +table.insert(a, 1, 10); table.insert(a, 1, 20); table.insert(a, 1, -1) +assert(table.remove(a) == 10) +assert(table.remove(a) == 20) +assert(table.remove(a) == -1) +assert(table.remove(a) == nil) + +a = {'c', 'd'} +table.insert(a, 3, 'a') +table.insert(a, 'b') +assert(table.remove(a, 1) == 'c') +assert(table.remove(a, 1) == 'd') +assert(table.remove(a, 1) == 'a') +assert(table.remove(a, 1) == 'b') +assert(table.remove(a, 1) == nil) +assert(#a == 0 and a.n == nil) + +a = {10,20,30,40} +assert(table.remove(a, #a + 1) == nil) +assert(not pcall(table.remove, a, 0)) +assert(a[#a] == 40) +assert(table.remove(a, #a) == 40) +assert(a[#a] == 30) +assert(table.remove(a, 2) == 20) +assert(a[#a] == 30 and #a == 2) + +do -- testing table library with metamethods + local function test (proxy, t) + for i = 1, 10 do + table.insert(proxy, 1, i) + end + assert(#proxy == 10 and #t == 10) + for i = 1, 10 do + assert(t[i] == 11 - i) + end + table.sort(proxy) + for i = 1, 10 do + assert(t[i] == i and proxy[i] == i) + end + assert(table.concat(proxy, ",") == "1,2,3,4,5,6,7,8,9,10") + for i = 1, 8 do + assert(table.remove(proxy, 1) == i) + end + assert(#proxy == 2 and #t == 2) + local a, b, c = table.unpack(proxy) + assert(a == 9 and b == 10 and c == nil) + end + + -- all virtual + local t = {} + local proxy = setmetatable({}, { + __len = function () return #t end, + __index = t, + __newindex = t, + }) + test(proxy, t) + + -- only __newindex + local count = 0 + t = setmetatable({}, { + __newindex = function (t,k,v) count = count + 1; rawset(t,k,v) end}) + test(t, t) + assert(count == 10) -- after first 10, all other sets are not new + + -- no __newindex + t = setmetatable({}, { + __index = function (_,k) return k + 1 end, + __len = function (_) return 5 end}) + assert(table.concat(t, ";") == "2;3;4;5;6") + +end + + +if not T then + (Message or print) + ('\n >>> testC not active: skipping tests for table library on non-tables <<<\n') +else --[ + local debug = require'debug' + local tab = {10, 20, 30} + local mt = {} + local u = T.newuserdata(0) + checkerror("table expected", table.insert, u, 40) + checkerror("table expected", table.remove, u) + debug.setmetatable(u, mt) + checkerror("table expected", table.insert, u, 40) + checkerror("table expected", table.remove, u) + mt.__index = tab + checkerror("table expected", table.insert, u, 40) + checkerror("table expected", table.remove, u) + mt.__newindex = tab + checkerror("table expected", table.insert, u, 40) + checkerror("table expected", table.remove, u) + mt.__len = function () return #tab end + table.insert(u, 40) + assert(#u == 4 and #tab == 4 and u[4] == 40 and tab[4] == 40) + assert(table.remove(u) == 40) + table.insert(u, 1, 50) + assert(#u == 4 and #tab == 4 and u[4] == 30 and tab[1] == 50) + + mt.__newindex = nil + mt.__len = nil + local tab2 = {} + local u2 = T.newuserdata(0) + debug.setmetatable(u2, {__newindex = function (_, k, v) tab2[k] = v end}) + table.move(u, 1, 4, 1, u2) + assert(#tab2 == 4 and tab2[1] == tab[1] and tab2[4] == tab[4]) + +end -- ] + +print('+') + +a = {} +for i=1,1000 do + a[i] = i; a[i-1] = nil +end +assert(next(a,nil) == 1000 and next(a,1000) == nil) + +assert(next({}) == nil) +assert(next({}, nil) == nil) + +for a,b in pairs{} do error"not here" end +for i=1,0 do error'not here' end +for i=0,1,-1 do error'not here' end +a = nil; for i=1,1 do assert(not a); a=1 end; assert(a) +a = nil; for i=1,1,-1 do assert(not a); a=1 end; assert(a) + +do + print("testing floats in numeric for") + local a + -- integer count + a = 0; for i=1, 1, 1 do a=a+1 end; assert(a==1) + a = 0; for i=10000, 1e4, -1 do a=a+1 end; assert(a==1) + a = 0; for i=1, 0.99999, 1 do a=a+1 end; assert(a==0) + a = 0; for i=9999, 1e4, -1 do a=a+1 end; assert(a==0) + a = 0; for i=1, 0.99999, -1 do a=a+1 end; assert(a==1) + + -- float count + a = 0; for i=0, 0.999999999, 0.1 do a=a+1 end; assert(a==10) + a = 0; for i=1.0, 1, 1 do a=a+1 end; assert(a==1) + a = 0; for i=-1.5, -1.5, 1 do a=a+1 end; assert(a==1) + a = 0; for i=1e6, 1e6, -1 do a=a+1 end; assert(a==1) + a = 0; for i=1.0, 0.99999, 1 do a=a+1 end; assert(a==0) + a = 0; for i=99999, 1e5, -1.0 do a=a+1 end; assert(a==0) + a = 0; for i=1.0, 0.99999, -1 do a=a+1 end; assert(a==1) +end + +-- conversion +a = 0; for i="10","1","-2" do a=a+1 end; assert(a==5) + +do -- checking types + local c + local function checkfloat (i) + assert(math.type(i) == "float") + c = c + 1 + end + + c = 0; for i = 1.0, 10 do checkfloat(i) end + assert(c == 10) + + c = 0; for i = -1, -10, -1.0 do checkfloat(i) end + assert(c == 10) + + local function checkint (i) + assert(math.type(i) == "integer") + c = c + 1 + end + + local m = math.maxinteger + c = 0; for i = m, m - 10, -1 do checkint(i) end + assert(c == 11) + + c = 0; for i = 1, 10.9 do checkint(i) end + assert(c == 10) + + c = 0; for i = 10, 0.001, -1 do checkint(i) end + assert(c == 10) + + c = 0; for i = 1, "10.8" do checkint(i) end + assert(c == 10) + + c = 0; for i = 9, "3.4", -1 do checkint(i) end + assert(c == 6) + + c = 0; for i = 0, " -3.4 ", -1 do checkint(i) end + assert(c == 4) + + c = 0; for i = 100, "96.3", -2 do checkint(i) end + assert(c == 2) + + c = 0; for i = 1, math.huge do if i > 10 then break end; checkint(i) end + assert(c == 10) + + c = 0; for i = -1, -math.huge, -1 do + if i < -10 then break end; checkint(i) + end + assert(c == 10) + + + for i = math.mininteger, -10e100 do assert(false) end + for i = math.maxinteger, 10e100, -1 do assert(false) end + +end + +collectgarbage() + + +-- testing generic 'for' + +local function f (n, p) + local t = {}; for i=1,p do t[i] = i*10 end + return function (_,n) + if n > 0 then + n = n-1 + return n, table.unpack(t) + end + end, nil, n +end + +local x = 0 +for n,a,b,c,d in f(5,3) do + x = x+1 + assert(a == 10 and b == 20 and c == 30 and d == nil) +end +assert(x == 5) + + + +-- testing __pairs and __ipairs metamethod +a = {} +do + local x,y,z = pairs(a) + assert(type(x) == 'function' and y == a and z == nil) +end + +local function foo (e,i) + assert(e == a) + if i <= 10 then return i+1, i+2 end +end + +local function foo1 (e,i) + i = i + 1 + assert(e == a) + if i <= e.n then return i,a[i] end +end + +setmetatable(a, {__pairs = function (x) return foo, x, 0 end}) + +local i = 0 +for k,v in pairs(a) do + i = i + 1 + assert(k == i and v == k+1) +end + +a.n = 5 +a[3] = 30 + +-- testing ipairs with metamethods +a = {n=10} +setmetatable(a, { __index = function (t,k) + if k <= t.n then return k * 10 end + end}) +i = 0 +for k,v in ipairs(a) do + i = i + 1 + assert(k == i and v == i * 10) +end +assert(i == a.n) + +print"OK" diff --git a/06/parser-gen/parsers/lua-5.3.4-tests/pm.lua b/06/parser-gen/parsers/lua-5.3.4-tests/pm.lua new file mode 100644 index 0000000..fde39ff --- /dev/null +++ b/06/parser-gen/parsers/lua-5.3.4-tests/pm.lua @@ -0,0 +1,374 @@ +-- $Id: pm.lua,v 1.48 2016/11/07 13:11:28 roberto Exp $ +-- See Copyright Notice in file all.lua + +print('testing pattern matching') + +local function checkerror (msg, f, ...) + local s, err = pcall(f, ...) + assert(not s and string.find(err, msg)) +end + + +function f(s, p) + local i,e = string.find(s, p) + if i then return string.sub(s, i, e) end +end + +a,b = string.find('', '') -- empty patterns are tricky +assert(a == 1 and b == 0); +a,b = string.find('alo', '') +assert(a == 1 and b == 0) +a,b = string.find('a\0o a\0o a\0o', 'a', 1) -- first position +assert(a == 1 and b == 1) +a,b = string.find('a\0o a\0o a\0o', 'a\0o', 2) -- starts in the midle +assert(a == 5 and b == 7) +a,b = string.find('a\0o a\0o a\0o', 'a\0o', 9) -- starts in the midle +assert(a == 9 and b == 11) +a,b = string.find('a\0a\0a\0a\0\0ab', '\0ab', 2); -- finds at the end +assert(a == 9 and b == 11); +a,b = string.find('a\0a\0a\0a\0\0ab', 'b') -- last position +assert(a == 11 and b == 11) +assert(string.find('a\0a\0a\0a\0\0ab', 'b\0') == nil) -- check ending +assert(string.find('', '\0') == nil) +assert(string.find('alo123alo', '12') == 4) +assert(string.find('alo123alo', '^12') == nil) + +assert(string.match("aaab", ".*b") == "aaab") +assert(string.match("aaa", ".*a") == "aaa") +assert(string.match("b", ".*b") == "b") + +assert(string.match("aaab", ".+b") == "aaab") +assert(string.match("aaa", ".+a") == "aaa") +assert(not string.match("b", ".+b")) + +assert(string.match("aaab", ".?b") == "ab") +assert(string.match("aaa", ".?a") == "aa") +assert(string.match("b", ".?b") == "b") + +assert(f('aloALO', '%l*') == 'alo') +assert(f('aLo_ALO', '%a*') == 'aLo') + +assert(f(" \n\r*&\n\r xuxu \n\n", "%g%g%g+") == "xuxu") + +assert(f('aaab', 'a*') == 'aaa'); +assert(f('aaa', '^.*$') == 'aaa'); +assert(f('aaa', 'b*') == ''); +assert(f('aaa', 'ab*a') == 'aa') +assert(f('aba', 'ab*a') == 'aba') +assert(f('aaab', 'a+') == 'aaa') +assert(f('aaa', '^.+$') == 'aaa') +assert(f('aaa', 'b+') == nil) +assert(f('aaa', 'ab+a') == nil) +assert(f('aba', 'ab+a') == 'aba') +assert(f('a$a', '.$') == 'a') +assert(f('a$a', '.%$') == 'a$') +assert(f('a$a', '.$.') == 'a$a') +assert(f('a$a', '$$') == nil) +assert(f('a$b', 'a$') == nil) +assert(f('a$a', '$') == '') +assert(f('', 'b*') == '') +assert(f('aaa', 'bb*') == nil) +assert(f('aaab', 'a-') == '') +assert(f('aaa', '^.-$') == 'aaa') +assert(f('aabaaabaaabaaaba', 'b.*b') == 'baaabaaabaaab') +assert(f('aabaaabaaabaaaba', 'b.-b') == 'baaab') +assert(f('alo xo', '.o$') == 'xo') +assert(f(' \n isto assim', '%S%S*') == 'isto') +assert(f(' \n isto assim', '%S*$') == 'assim') +assert(f(' \n isto assim', '[a-z]*$') == 'assim') +assert(f('um caracter ? extra', '[^%sa-z]') == '?') +assert(f('', 'a?') == '') +assert(f('', '?') == '') +assert(f('bl', '?b?l?') == 'bl') +assert(f(' bl', '?b?l?') == '') +assert(f('aa', '^aa?a?a') == 'aa') +assert(f(']]]b', '[^]]') == '') +assert(f("0alo alo", "%x*") == "0a") +assert(f("alo alo", "%C+") == "alo alo") +print('+') + + +function f1(s, p) + p = string.gsub(p, "%%([0-9])", function (s) + return "%" .. (tonumber(s)+1) + end) + p = string.gsub(p, "^(^?)", "%1()", 1) + p = string.gsub(p, "($?)$", "()%1", 1) + local t = {string.match(s, p)} + return string.sub(s, t[1], t[#t] - 1) +end + +assert(f1('alo alx 123 b\0o b\0o', '(..*) %1') == "b\0o b\0o") +assert(f1('axz123= 4= 4 34', '(.+)=(.*)=%2 %1') == '3= 4= 4 3') +assert(f1('=======', '^(=*)=%1$') == '=======') +assert(string.match('==========', '^([=]*)=%1$') == nil) + +local function range (i, j) + if i <= j then + return i, range(i+1, j) + end +end + +local abc = string.char(range(0, 255)); + +assert(string.len(abc) == 256) + +function strset (p) + local res = {s=''} + string.gsub(abc, p, function (c) res.s = res.s .. c end) + return res.s +end; + +assert(string.len(strset('[\200-\210]')) == 11) + +assert(strset('[a-z]') == "abcdefghijklmnopqrstuvwxyz") +assert(strset('[a-z%d]') == strset('[%da-uu-z]')) +assert(strset('[a-]') == "-a") +assert(strset('[^%W]') == strset('[%w]')) +assert(strset('[]%%]') == '%]') +assert(strset('[a%-z]') == '-az') +assert(strset('[%^%[%-a%]%-b]') == '-[]^ab') +assert(strset('%Z') == strset('[\1-\255]')) +assert(strset('.') == strset('[\1-\255%z]')) +print('+'); + +assert(string.match("alo xyzK", "(%w+)K") == "xyz") +assert(string.match("254 K", "(%d*)K") == "") +assert(string.match("alo ", "(%w*)$") == "") +assert(string.match("alo ", "(%w+)$") == nil) +assert(string.find("(lo)", "%(") == 1) +local a, b, c, d, e = string.match("lo alo", "^(((.).).* (%w*))$") +assert(a == 'lo alo' and b == 'l' and c == '' and d == 'alo' and e == nil) +a, b, c, d = string.match('0123456789', '(.+(.?)())') +assert(a == '0123456789' and b == '' and c == 11 and d == nil) +print('+') + +assert(string.gsub('lo lo', '', 'x') == 'xlo xlo') +assert(string.gsub('alo lo ', ' +$', '') == 'alo lo') -- trim +assert(string.gsub(' alo alo ', '^%s*(.-)%s*$', '%1') == 'alo alo') -- double trim +assert(string.gsub('alo alo \n 123\n ', '%s+', ' ') == 'alo alo 123 ') +t = "ab d" +a, b = string.gsub(t, '(.)', '%1@') +assert('@'..a == string.gsub(t, '', '@') and b == 5) +a, b = string.gsub('abd', '(.)', '%0@', 2) +assert(a == 'a@b@d' and b == 2) +assert(string.gsub('alo alo', '()[al]', '%1') == '12o 56o') +assert(string.gsub("abc=xyz", "(%w*)(%p)(%w+)", "%3%2%1-%0") == + "xyz=abc-abc=xyz") +assert(string.gsub("abc", "%w", "%1%0") == "aabbcc") +assert(string.gsub("abc", "%w+", "%0%1") == "abcabc") +assert(string.gsub('', '$', '\0') == '\0') +assert(string.gsub('', '^', 'r') == 'r') +assert(string.gsub('', '$', 'r') == 'r') +print('+') + + +do -- new (5.3.3) semantics for empty matches + assert(string.gsub("a b cd", " *", "-") == "-a-b-c-d-") + + local res = "" + local sub = "a \nbc\t\td" + local i = 1 + for p, e in string.gmatch(sub, "()%s*()") do + res = res .. string.sub(sub, i, p - 1) .. "-" + i = e + end + assert(res == "-a-b-c-d-") +end + + +assert(string.gsub("um (dois) tres (quatro)", "(%(%w+%))", string.upper) == + "um (DOIS) tres (QUATRO)") + +do + local function setglobal (n,v) rawset(_G, n, v) end + string.gsub("a=roberto,roberto=a", "(%w+)=(%w%w*)", setglobal) + assert(_G.a=="roberto" and _G.roberto=="a") +end + +function f(a,b) return string.gsub(a,'.',b) end +assert(string.gsub("trocar tudo em |teste|b| |beleza|al|", "|([^|]*)|([^|]*)|", f) == + "trocar tudo em bbbbb alalalalalal") + +local function dostring (s) return load(s, "")() or "" end +assert(string.gsub("alo $a='x'$ novamente $return a$", + "$([^$]*)%$", + dostring) == "alo novamente x") + +x = string.gsub("$x=string.gsub('alo', '.', string.upper)$ assim vai para $return x$", + "$([^$]*)%$", dostring) +assert(x == ' assim vai para ALO') + +t = {} +s = 'a alo jose joao' +r = string.gsub(s, '()(%w+)()', function (a,w,b) + assert(string.len(w) == b-a); + t[a] = b-a; + end) +assert(s == r and t[1] == 1 and t[3] == 3 and t[7] == 4 and t[13] == 4) + + +function isbalanced (s) + return string.find(string.gsub(s, "%b()", ""), "[()]") == nil +end + +assert(isbalanced("(9 ((8))(\0) 7) \0\0 a b ()(c)() a")) +assert(not isbalanced("(9 ((8) 7) a b (\0 c) a")) +assert(string.gsub("alo 'oi' alo", "%b''", '"') == 'alo " alo') + + +local t = {"apple", "orange", "lime"; n=0} +assert(string.gsub("x and x and x", "x", function () t.n=t.n+1; return t[t.n] end) + == "apple and orange and lime") + +t = {n=0} +string.gsub("first second word", "%w%w*", function (w) t.n=t.n+1; t[t.n] = w end) +assert(t[1] == "first" and t[2] == "second" and t[3] == "word" and t.n == 3) + +t = {n=0} +assert(string.gsub("first second word", "%w+", + function (w) t.n=t.n+1; t[t.n] = w end, 2) == "first second word") +assert(t[1] == "first" and t[2] == "second" and t[3] == nil) + +checkerror("invalid replacement value %(a table%)", + string.gsub, "alo", ".", {a = {}}) +checkerror("invalid capture index %%2", string.gsub, "alo", ".", "%2") +checkerror("invalid capture index %%0", string.gsub, "alo", "(%0)", "a") +checkerror("invalid capture index %%1", string.gsub, "alo", "(%1)", "a") +checkerror("invalid use of '%%'", string.gsub, "alo", ".", "%x") + +-- bug since 2.5 (C-stack overflow) +do + local function f (size) + local s = string.rep("a", size) + local p = string.rep(".?", size) + return pcall(string.match, s, p) + end + local r, m = f(80) + assert(r and #m == 80) + r, m = f(200000) + assert(not r and string.find(m, "too complex")) +end + +if not _soft then + print("big strings") + local a = string.rep('a', 300000) + assert(string.find(a, '^a*.?$')) + assert(not string.find(a, '^a*.?b$')) + assert(string.find(a, '^a-.?$')) + + -- bug in 5.1.2 + a = string.rep('a', 10000) .. string.rep('b', 10000) + assert(not pcall(string.gsub, a, 'b')) +end + +-- recursive nest of gsubs +function rev (s) + return string.gsub(s, "(.)(.+)", function (c,s1) return rev(s1)..c end) +end + +local x = "abcdef" +assert(rev(rev(x)) == x) + + +-- gsub with tables +assert(string.gsub("alo alo", ".", {}) == "alo alo") +assert(string.gsub("alo alo", "(.)", {a="AA", l=""}) == "AAo AAo") +assert(string.gsub("alo alo", "(.).", {a="AA", l="K"}) == "AAo AAo") +assert(string.gsub("alo alo", "((.)(.?))", {al="AA", o=false}) == "AAo AAo") + +assert(string.gsub("alo alo", "().", {'x','yy','zzz'}) == "xyyzzz alo") + +t = {}; setmetatable(t, {__index = function (t,s) return string.upper(s) end}) +assert(string.gsub("a alo b hi", "%w%w+", t) == "a ALO b HI") + + +-- tests for gmatch +local a = 0 +for i in string.gmatch('abcde', '()') do assert(i == a+1); a=i end +assert(a==6) + +t = {n=0} +for w in string.gmatch("first second word", "%w+") do + t.n=t.n+1; t[t.n] = w +end +assert(t[1] == "first" and t[2] == "second" and t[3] == "word") + +t = {3, 6, 9} +for i in string.gmatch ("xuxx uu ppar r", "()(.)%2") do + assert(i == table.remove(t, 1)) +end +assert(#t == 0) + +t = {} +for i,j in string.gmatch("13 14 10 = 11, 15= 16, 22=23", "(%d+)%s*=%s*(%d+)") do + t[tonumber(i)] = tonumber(j) +end +a = 0 +for k,v in pairs(t) do assert(k+1 == v+0); a=a+1 end +assert(a == 3) + + +-- tests for `%f' (`frontiers') + +assert(string.gsub("aaa aa a aaa a", "%f[%w]a", "x") == "xaa xa x xaa x") +assert(string.gsub("[[]] [][] [[[[", "%f[[].", "x") == "x[]] x]x] x[[[") +assert(string.gsub("01abc45de3", "%f[%d]", ".") == ".01abc.45de.3") +assert(string.gsub("01abc45 de3x", "%f[%D]%w", ".") == "01.bc45 de3.") +assert(string.gsub("function", "%f[\1-\255]%w", ".") == ".unction") +assert(string.gsub("function", "%f[^\1-\255]", ".") == "function.") + +assert(string.find("a", "%f[a]") == 1) +assert(string.find("a", "%f[^%z]") == 1) +assert(string.find("a", "%f[^%l]") == 2) +assert(string.find("aba", "%f[a%z]") == 3) +assert(string.find("aba", "%f[%z]") == 4) +assert(not string.find("aba", "%f[%l%z]")) +assert(not string.find("aba", "%f[^%l%z]")) + +local i, e = string.find(" alo aalo allo", "%f[%S].-%f[%s].-%f[%S]") +assert(i == 2 and e == 5) +local k = string.match(" alo aalo allo", "%f[%S](.-%f[%s].-%f[%S])") +assert(k == 'alo ') + +local a = {1, 5, 9, 14, 17,} +for k in string.gmatch("alo alo th02 is 1hat", "()%f[%w%d]") do + assert(table.remove(a, 1) == k) +end +assert(#a == 0) + + +-- malformed patterns +local function malform (p, m) + m = m or "malformed" + local r, msg = pcall(string.find, "a", p) + assert(not r and string.find(msg, m)) +end + +malform("(.", "unfinished capture") +malform(".)", "invalid pattern capture") +malform("[a") +malform("[]") +malform("[^]") +malform("[a%]") +malform("[a%") +malform("%b") +malform("%ba") +malform("%") +malform("%f", "missing") + +-- \0 in patterns +assert(string.match("ab\0\1\2c", "[\0-\2]+") == "\0\1\2") +assert(string.match("ab\0\1\2c", "[\0-\0]+") == "\0") +assert(string.find("b$a", "$\0?") == 2) +assert(string.find("abc\0efg", "%\0") == 4) +assert(string.match("abc\0efg\0\1e\1g", "%b\0\1") == "\0efg\0\1e\1") +assert(string.match("abc\0\0\0", "%\0+") == "\0\0\0") +assert(string.match("abc\0\0\0", "%\0%\0?") == "\0\0") + +-- magic char after \0 +assert(string.find("abc\0\0","\0.") == 4) +assert(string.find("abcx\0\0abc\0abc","x\0\0abc\0a.") == 4) + +print('OK') + diff --git a/06/parser-gen/parsers/lua-5.3.4-tests/sort.lua b/06/parser-gen/parsers/lua-5.3.4-tests/sort.lua new file mode 100644 index 0000000..d52feee --- /dev/null +++ b/06/parser-gen/parsers/lua-5.3.4-tests/sort.lua @@ -0,0 +1,310 @@ +-- $Id: sort.lua,v 1.38 2016/11/07 13:11:28 roberto Exp $ +-- See Copyright Notice in file all.lua + +print "testing (parts of) table library" + +print "testing unpack" + +local unpack = table.unpack + +local maxI = math.maxinteger +local minI = math.mininteger + + +local function checkerror (msg, f, ...) + local s, err = pcall(f, ...) + assert(not s and string.find(err, msg)) +end + + +checkerror("wrong number of arguments", table.insert, {}, 2, 3, 4) + +local x,y,z,a,n +a = {}; lim = _soft and 200 or 2000 +for i=1, lim do a[i]=i end +assert(select(lim, unpack(a)) == lim and select('#', unpack(a)) == lim) +x = unpack(a) +assert(x == 1) +x = {unpack(a)} +assert(#x == lim and x[1] == 1 and x[lim] == lim) +x = {unpack(a, lim-2)} +assert(#x == 3 and x[1] == lim-2 and x[3] == lim) +x = {unpack(a, 10, 6)} +assert(next(x) == nil) -- no elements +x = {unpack(a, 11, 10)} +assert(next(x) == nil) -- no elements +x,y = unpack(a, 10, 10) +assert(x == 10 and y == nil) +x,y,z = unpack(a, 10, 11) +assert(x == 10 and y == 11 and z == nil) +a,x = unpack{1} +assert(a==1 and x==nil) +a,x = unpack({1,2}, 1, 1) +assert(a==1 and x==nil) + +do + local maxi = (1 << 31) - 1 -- maximum value for an int (usually) + local mini = -(1 << 31) -- minimum value for an int (usually) + checkerror("too many results", unpack, {}, 0, maxi) + checkerror("too many results", unpack, {}, 1, maxi) + checkerror("too many results", unpack, {}, 0, maxI) + checkerror("too many results", unpack, {}, 1, maxI) + checkerror("too many results", unpack, {}, mini, maxi) + checkerror("too many results", unpack, {}, -maxi, maxi) + checkerror("too many results", unpack, {}, minI, maxI) + unpack({}, maxi, 0) + unpack({}, maxi, 1) + unpack({}, maxI, minI) + pcall(unpack, {}, 1, maxi + 1) + local a, b = unpack({[maxi] = 20}, maxi, maxi) + assert(a == 20 and b == nil) + a, b = unpack({[maxi] = 20}, maxi - 1, maxi) + assert(a == nil and b == 20) + local t = {[maxI - 1] = 12, [maxI] = 23} + a, b = unpack(t, maxI - 1, maxI); assert(a == 12 and b == 23) + a, b = unpack(t, maxI, maxI); assert(a == 23 and b == nil) + a, b = unpack(t, maxI, maxI - 1); assert(a == nil and b == nil) + t = {[minI] = 12.3, [minI + 1] = 23.5} + a, b = unpack(t, minI, minI + 1); assert(a == 12.3 and b == 23.5) + a, b = unpack(t, minI, minI); assert(a == 12.3 and b == nil) + a, b = unpack(t, minI + 1, minI); assert(a == nil and b == nil) +end + +do -- length is not an integer + local t = setmetatable({}, {__len = function () return 'abc' end}) + assert(#t == 'abc') + checkerror("object length is not an integer", table.insert, t, 1) +end + +print "testing pack" + +a = table.pack() +assert(a[1] == nil and a.n == 0) + +a = table.pack(table) +assert(a[1] == table and a.n == 1) + +a = table.pack(nil, nil, nil, nil) +assert(a[1] == nil and a.n == 4) + + +-- testing move +do + + checkerror("table expected", table.move, 1, 2, 3, 4) + + local function eqT (a, b) + for k, v in pairs(a) do assert(b[k] == v) end + for k, v in pairs(b) do assert(a[k] == v) end + end + + local a = table.move({10,20,30}, 1, 3, 2) -- move forward + eqT(a, {10,10,20,30}) + + -- move forward with overlap of 1 + a = table.move({10, 20, 30}, 1, 3, 3) + eqT(a, {10, 20, 10, 20, 30}) + + -- moving to the same table (not being explicit about it) + a = {10, 20, 30, 40} + table.move(a, 1, 4, 2, a) + eqT(a, {10, 10, 20, 30, 40}) + + a = table.move({10,20,30}, 2, 3, 1) -- move backward + eqT(a, {20,30,30}) + + a = {} -- move to new table + assert(table.move({10,20,30}, 1, 3, 1, a) == a) + eqT(a, {10,20,30}) + + a = {} + assert(table.move({10,20,30}, 1, 0, 3, a) == a) -- empty move (no move) + eqT(a, {}) + + a = table.move({10,20,30}, 1, 10, 1) -- move to the same place + eqT(a, {10,20,30}) + + -- moving on the fringes + a = table.move({[maxI - 2] = 1, [maxI - 1] = 2, [maxI] = 3}, + maxI - 2, maxI, -10, {}) + eqT(a, {[-10] = 1, [-9] = 2, [-8] = 3}) + + a = table.move({[minI] = 1, [minI + 1] = 2, [minI + 2] = 3}, + minI, minI + 2, -10, {}) + eqT(a, {[-10] = 1, [-9] = 2, [-8] = 3}) + + a = table.move({45}, 1, 1, maxI) + eqT(a, {45, [maxI] = 45}) + + a = table.move({[maxI] = 100}, maxI, maxI, minI) + eqT(a, {[minI] = 100, [maxI] = 100}) + + a = table.move({[minI] = 100}, minI, minI, maxI) + eqT(a, {[minI] = 100, [maxI] = 100}) + + a = setmetatable({}, { + __index = function (_,k) return k * 10 end, + __newindex = error}) + local b = table.move(a, 1, 10, 3, {}) + eqT(a, {}) + eqT(b, {nil,nil,10,20,30,40,50,60,70,80,90,100}) + + b = setmetatable({""}, { + __index = error, + __newindex = function (t,k,v) + t[1] = string.format("%s(%d,%d)", t[1], k, v) + end}) + table.move(a, 10, 13, 3, b) + assert(b[1] == "(3,100)(4,110)(5,120)(6,130)") + local stat, msg = pcall(table.move, b, 10, 13, 3, b) + assert(not stat and msg == b) +end + +do + -- for very long moves, just check initial accesses and interrupt + -- move with an error + local function checkmove (f, e, t, x, y) + local pos1, pos2 + local a = setmetatable({}, { + __index = function (_,k) pos1 = k end, + __newindex = function (_,k) pos2 = k; error() end, }) + local st, msg = pcall(table.move, a, f, e, t) + assert(not st and not msg and pos1 == x and pos2 == y) + end + checkmove(1, maxI, 0, 1, 0) + checkmove(0, maxI - 1, 1, maxI - 1, maxI) + checkmove(minI, -2, -5, -2, maxI - 6) + checkmove(minI + 1, -1, -2, -1, maxI - 3) + checkmove(minI, -2, 0, minI, 0) -- non overlapping + checkmove(minI + 1, -1, 1, minI + 1, 1) -- non overlapping +end + +checkerror("too many", table.move, {}, 0, maxI, 1) +checkerror("too many", table.move, {}, -1, maxI - 1, 1) +checkerror("too many", table.move, {}, minI, -1, 1) +checkerror("too many", table.move, {}, minI, maxI, 1) +checkerror("wrap around", table.move, {}, 1, maxI, 2) +checkerror("wrap around", table.move, {}, 1, 2, maxI) +checkerror("wrap around", table.move, {}, minI, -2, 2) + + +print"testing sort" + + +-- strange lengths +local a = setmetatable({}, {__len = function () return -1 end}) +assert(#a == -1) +table.sort(a, error) -- should not compare anything +a = setmetatable({}, {__len = function () return maxI end}) +checkerror("too big", table.sort, a) + +-- test checks for invalid order functions +local function check (t) + local function f(a, b) assert(a and b); return true end + checkerror("invalid order function", table.sort, t, f) +end + +check{1,2,3,4} +check{1,2,3,4,5} +check{1,2,3,4,5,6} + + +function check (a, f) + f = f or function (x,y) return x 'alo\0alo\0') +assert('alo' < 'alo\0') +assert('alo\0' > 'alo') +assert('\0' < '\1') +assert('\0\0' < '\0\1') +assert('\1\0a\0a' <= '\1\0a\0a') +assert(not ('\1\0a\0b' <= '\1\0a\0a')) +assert('\0\0\0' < '\0\0\0\0') +assert(not('\0\0\0\0' < '\0\0\0')) +assert('\0\0\0' <= '\0\0\0\0') +assert(not('\0\0\0\0' <= '\0\0\0')) +assert('\0\0\0' <= '\0\0\0') +assert('\0\0\0' >= '\0\0\0') +assert(not ('\0\0b' < '\0\0a\0')) + +-- testing string.sub +assert(string.sub("123456789",2,4) == "234") +assert(string.sub("123456789",7) == "789") +assert(string.sub("123456789",7,6) == "") +assert(string.sub("123456789",7,7) == "7") +assert(string.sub("123456789",0,0) == "") +assert(string.sub("123456789",-10,10) == "123456789") +assert(string.sub("123456789",1,9) == "123456789") +assert(string.sub("123456789",-10,-20) == "") +assert(string.sub("123456789",-1) == "9") +assert(string.sub("123456789",-4) == "6789") +assert(string.sub("123456789",-6, -4) == "456") +assert(string.sub("123456789", mini, -4) == "123456") +assert(string.sub("123456789", mini, maxi) == "123456789") +assert(string.sub("123456789", mini, mini) == "") +assert(string.sub("\000123456789",3,5) == "234") +assert(("\000123456789"):sub(8) == "789") + +-- testing string.find +assert(string.find("123456789", "345") == 3) +a,b = string.find("123456789", "345") +assert(string.sub("123456789", a, b) == "345") +assert(string.find("1234567890123456789", "345", 3) == 3) +assert(string.find("1234567890123456789", "345", 4) == 13) +assert(string.find("1234567890123456789", "346", 4) == nil) +assert(string.find("1234567890123456789", ".45", -9) == 13) +assert(string.find("abcdefg", "\0", 5, 1) == nil) +assert(string.find("", "") == 1) +assert(string.find("", "", 1) == 1) +assert(not string.find("", "", 2)) +assert(string.find('', 'aaa', 1) == nil) +assert(('alo(.)alo'):find('(.)', 1, 1) == 4) + +assert(string.len("") == 0) +assert(string.len("\0\0\0") == 3) +assert(string.len("1234567890") == 10) + +assert(#"" == 0) +assert(#"\0\0\0" == 3) +assert(#"1234567890" == 10) + +-- testing string.byte/string.char +assert(string.byte("a") == 97) +assert(string.byte("\xe4") > 127) +assert(string.byte(string.char(255)) == 255) +assert(string.byte(string.char(0)) == 0) +assert(string.byte("\0") == 0) +assert(string.byte("\0\0alo\0x", -1) == string.byte('x')) +assert(string.byte("ba", 2) == 97) +assert(string.byte("\n\n", 2, -1) == 10) +assert(string.byte("\n\n", 2, 2) == 10) +assert(string.byte("") == nil) +assert(string.byte("hi", -3) == nil) +assert(string.byte("hi", 3) == nil) +assert(string.byte("hi", 9, 10) == nil) +assert(string.byte("hi", 2, 1) == nil) +assert(string.char() == "") +assert(string.char(0, 255, 0) == "\0\255\0") +assert(string.char(0, string.byte("\xe4"), 0) == "\0\xe4\0") +assert(string.char(string.byte("\xe4l\0u", 1, -1)) == "\xe4l\0u") +assert(string.char(string.byte("\xe4l\0u", 1, 0)) == "") +assert(string.char(string.byte("\xe4l\0u", -10, 100)) == "\xe4l\0u") + +assert(string.upper("ab\0c") == "AB\0C") +assert(string.lower("\0ABCc%$") == "\0abcc%$") +assert(string.rep('teste', 0) == '') +assert(string.rep('ts\00t', 2) == 'ts\0tts\000t') +assert(string.rep('', 10) == '') + +if string.packsize("i") == 4 then + -- result length would be 2^31 (int overflow) + checkerror("too large", string.rep, 'aa', (1 << 30)) + checkerror("too large", string.rep, 'a', (1 << 30), ',') +end + +-- repetitions with separator +assert(string.rep('teste', 0, 'xuxu') == '') +assert(string.rep('teste', 1, 'xuxu') == 'teste') +assert(string.rep('\1\0\1', 2, '\0\0') == '\1\0\1\0\0\1\0\1') +assert(string.rep('', 10, '.') == string.rep('.', 9)) +assert(not pcall(string.rep, "aa", maxi // 2 + 10)) +assert(not pcall(string.rep, "", maxi // 2 + 10, "aa")) + +assert(string.reverse"" == "") +assert(string.reverse"\0\1\2\3" == "\3\2\1\0") +assert(string.reverse"\0001234" == "4321\0") + +for i=0,30 do assert(string.len(string.rep('a', i)) == i) end + +assert(type(tostring(nil)) == 'string') +assert(type(tostring(12)) == 'string') +assert(string.find(tostring{}, 'table:')) +assert(string.find(tostring(print), 'function:')) +assert(#tostring('\0') == 1) +assert(tostring(true) == "true") +assert(tostring(false) == "false") +assert(tostring(-1203) == "-1203") +assert(tostring(1203.125) == "1203.125") +assert(tostring(-0.5) == "-0.5") +assert(tostring(-32767) == "-32767") +if math.tointeger(2147483647) then -- no overflow? (32 bits) + assert(tostring(-2147483647) == "-2147483647") +end +if math.tointeger(4611686018427387904) then -- no overflow? (64 bits) + assert(tostring(4611686018427387904) == "4611686018427387904") + assert(tostring(-4611686018427387904) == "-4611686018427387904") +end + +if tostring(0.0) == "0.0" then -- "standard" coercion float->string + assert('' .. 12 == '12' and 12.0 .. '' == '12.0') + assert(tostring(-1203 + 0.0) == "-1203.0") +else -- compatible coercion + assert(tostring(0.0) == "0") + assert('' .. 12 == '12' and 12.0 .. '' == '12') + assert(tostring(-1203 + 0.0) == "-1203") +end + + +x = '"lo"\n\\' +assert(string.format('%q%s', x, x) == '"\\"lo\\"\\\n\\\\""lo"\n\\') +assert(string.format('%q', "\0") == [["\0"]]) +assert(load(string.format('return %q', x))() == x) +x = "\0\1\0023\5\0009" +assert(load(string.format('return %q', x))() == x) +assert(string.format("\0%c\0%c%x\0", string.byte("\xe4"), string.byte("b"), 140) == + "\0\xe4\0b8c\0") +assert(string.format('') == "") +assert(string.format("%c",34)..string.format("%c",48)..string.format("%c",90)..string.format("%c",100) == + string.format("%c%c%c%c", 34, 48, 90, 100)) +assert(string.format("%s\0 is not \0%s", 'not be', 'be') == 'not be\0 is not \0be') +assert(string.format("%%%d %010d", 10, 23) == "%10 0000000023") +assert(tonumber(string.format("%f", 10.3)) == 10.3) +x = string.format('"%-50s"', 'a') +assert(#x == 52) +assert(string.sub(x, 1, 4) == '"a ') + +assert(string.format("-%.20s.20s", string.rep("%", 2000)) == + "-"..string.rep("%", 20)..".20s") +assert(string.format('"-%20s.20s"', string.rep("%", 2000)) == + string.format("%q", "-"..string.rep("%", 2000)..".20s")) + +do + local function checkQ (v) + local s = string.format("%q", v) + local nv = load("return " .. s)() + assert(v == nv and math.type(v) == math.type(nv)) + end + checkQ("\0\0\1\255\u{234}") + checkQ(math.maxinteger) + checkQ(math.mininteger) + checkQ(math.pi) + checkQ(0.1) + checkQ(true) + checkQ(nil) + checkQ(false) + checkerror("no literal", string.format, "%q", {}) +end + +assert(string.format("\0%s\0", "\0\0\1") == "\0\0\0\1\0") +checkerror("contains zeros", string.format, "%10s", "\0") + +-- format x tostring +assert(string.format("%s %s", nil, true) == "nil true") +assert(string.format("%s %.4s", false, true) == "false true") +assert(string.format("%.3s %.3s", false, true) == "fal tru") +local m = setmetatable({}, {__tostring = function () return "hello" end, + __name = "hi"}) +assert(string.format("%s %.10s", m, m) == "hello hello") +getmetatable(m).__tostring = nil -- will use '__name' from now on +assert(string.format("%.4s", m) == "hi: ") + +getmetatable(m).__tostring = function () return {} end +checkerror("'__tostring' must return a string", tostring, m) + + +assert(string.format("%x", 0.0) == "0") +assert(string.format("%02x", 0.0) == "00") +assert(string.format("%08X", 0xFFFFFFFF) == "FFFFFFFF") +assert(string.format("%+08d", 31501) == "+0031501") +assert(string.format("%+08d", -30927) == "-0030927") + + +do -- longest number that can be formatted + local i = 1 + local j = 10000 + while i + 1 < j do -- binary search for maximum finite float + local m = (i + j) // 2 + if 10^m < math.huge then i = m else j = m end + end + assert(10^i < math.huge and 10^j == math.huge) + local s = string.format('%.99f', -(10^i)) + assert(string.len(s) >= i + 101) + assert(tonumber(s) == -(10^i)) +end + + +-- testing large numbers for format +do -- assume at least 32 bits + local max, min = 0x7fffffff, -0x80000000 -- "large" for 32 bits + assert(string.sub(string.format("%8x", -1), -8) == "ffffffff") + assert(string.format("%x", max) == "7fffffff") + assert(string.sub(string.format("%x", min), -8) == "80000000") + assert(string.format("%d", max) == "2147483647") + assert(string.format("%d", min) == "-2147483648") + assert(string.format("%u", 0xffffffff) == "4294967295") + assert(string.format("%o", 0xABCD) == "125715") + + max, min = 0x7fffffffffffffff, -0x8000000000000000 + if max > 2.0^53 then -- only for 64 bits + assert(string.format("%x", (2^52 | 0) - 1) == "fffffffffffff") + assert(string.format("0x%8X", 0x8f000003) == "0x8F000003") + assert(string.format("%d", 2^53) == "9007199254740992") + assert(string.format("%i", -2^53) == "-9007199254740992") + assert(string.format("%x", max) == "7fffffffffffffff") + assert(string.format("%x", min) == "8000000000000000") + assert(string.format("%d", max) == "9223372036854775807") + assert(string.format("%d", min) == "-9223372036854775808") + assert(string.format("%u", ~(-1 << 64)) == "18446744073709551615") + assert(tostring(1234567890123) == '1234567890123') + end +end + + +do print("testing 'format %a %A'") + local function matchhexa (n) + local s = string.format("%a", n) + -- result matches ISO C requirements + assert(string.find(s, "^%-?0x[1-9a-f]%.?[0-9a-f]*p[-+]?%d+$")) + assert(tonumber(s) == n) -- and has full precision + s = string.format("%A", n) + assert(string.find(s, "^%-?0X[1-9A-F]%.?[0-9A-F]*P[-+]?%d+$")) + assert(tonumber(s) == n) + end + for _, n in ipairs{0.1, -0.1, 1/3, -1/3, 1e30, -1e30, + -45/247, 1, -1, 2, -2, 3e-20, -3e-20} do + matchhexa(n) + end + + assert(string.find(string.format("%A", 0.0), "^0X0%.?0?P%+?0$")) + assert(string.find(string.format("%a", -0.0), "^%-0x0%.?0?p%+?0$")) + + if not _port then -- test inf, -inf, NaN, and -0.0 + assert(string.find(string.format("%a", 1/0), "^inf")) + assert(string.find(string.format("%A", -1/0), "^%-INF")) + assert(string.find(string.format("%a", 0/0), "^%-?nan")) + assert(string.find(string.format("%a", -0.0), "^%-0x0")) + end + + if not pcall(string.format, "%.3a", 0) then + (Message or print)("\n >>> modifiers for format '%a' not available <<<\n") + else + assert(string.find(string.format("%+.2A", 12), "^%+0X%x%.%x0P%+?%d$")) + assert(string.find(string.format("%.4A", -12), "^%-0X%x%.%x000P%+?%d$")) + end +end + + +-- errors in format + +local function check (fmt, msg) + checkerror(msg, string.format, fmt, 10) +end + +local aux = string.rep('0', 600) +check("%100.3d", "too long") +check("%1"..aux..".3d", "too long") +check("%1.100d", "too long") +check("%10.1"..aux.."004d", "too long") +check("%t", "invalid option") +check("%"..aux.."d", "repeated flags") +check("%d %d", "no value") + + +assert(load("return 1\n--comment without ending EOL")() == 1) + + +checkerror("table expected", table.concat, 3) +assert(table.concat{} == "") +assert(table.concat({}, 'x') == "") +assert(table.concat({'\0', '\0\1', '\0\1\2'}, '.\0.') == "\0.\0.\0\1.\0.\0\1\2") +local a = {}; for i=1,300 do a[i] = "xuxu" end +assert(table.concat(a, "123").."123" == string.rep("xuxu123", 300)) +assert(table.concat(a, "b", 20, 20) == "xuxu") +assert(table.concat(a, "", 20, 21) == "xuxuxuxu") +assert(table.concat(a, "x", 22, 21) == "") +assert(table.concat(a, "3", 299) == "xuxu3xuxu") +assert(table.concat({}, "x", maxi, maxi - 1) == "") +assert(table.concat({}, "x", mini + 1, mini) == "") +assert(table.concat({}, "x", maxi, mini) == "") +assert(table.concat({[maxi] = "alo"}, "x", maxi, maxi) == "alo") +assert(table.concat({[maxi] = "alo", [maxi - 1] = "y"}, "-", maxi - 1, maxi) + == "y-alo") + +assert(not pcall(table.concat, {"a", "b", {}})) + +a = {"a","b","c"} +assert(table.concat(a, ",", 1, 0) == "") +assert(table.concat(a, ",", 1, 1) == "a") +assert(table.concat(a, ",", 1, 2) == "a,b") +assert(table.concat(a, ",", 2) == "b,c") +assert(table.concat(a, ",", 3) == "c") +assert(table.concat(a, ",", 4) == "") + +if not _port then + + local locales = { "ptb", "pt_BR.iso88591", "ISO-8859-1" } + local function trylocale (w) + for i = 1, #locales do + if os.setlocale(locales[i], w) then + print(string.format("'%s' locale set to '%s'", w, locales[i])) + return locales[i] + end + end + print(string.format("'%s' locale not found", w)) + return false + end + + if trylocale("collate") then + assert("alo" < "lo" and "lo" < "amo") + end + + if trylocale("ctype") then + assert(string.gsub("", "%a", "x") == "xxxxx") + assert(string.gsub("", "%l", "x") == "xx") + assert(string.gsub("", "%u", "x") == "xx") + assert(string.upper"{xuxu}o" == "{XUXU}O") + end + + os.setlocale("C") + assert(os.setlocale() == 'C') + assert(os.setlocale(nil, "numeric") == 'C') + +end + + +-- bug in Lua 5.3.2 +-- 'gmatch' iterator does not work across coroutines +do + local f = string.gmatch("1 2 3 4 5", "%d+") + assert(f() == "1") + co = coroutine.wrap(f) + assert(co() == "2") +end + +print('OK') + diff --git a/06/parser-gen/parsers/lua-5.3.4-tests/tpack.lua b/06/parser-gen/parsers/lua-5.3.4-tests/tpack.lua new file mode 100644 index 0000000..96bb4da --- /dev/null +++ b/06/parser-gen/parsers/lua-5.3.4-tests/tpack.lua @@ -0,0 +1,322 @@ +-- $Id: tpack.lua,v 1.13 2016/11/07 13:11:28 roberto Exp $ +-- See Copyright Notice in file all.lua + +local pack = string.pack +local packsize = string.packsize +local unpack = string.unpack + +print "testing pack/unpack" + +-- maximum size for integers +local NB = 16 + +local sizeshort = packsize("h") +local sizeint = packsize("i") +local sizelong = packsize("l") +local sizesize_t = packsize("T") +local sizeLI = packsize("j") +local sizefloat = packsize("f") +local sizedouble = packsize("d") +local sizenumber = packsize("n") +local little = (pack("i2", 1) == "\1\0") +local align = packsize("!xXi16") + +assert(1 <= sizeshort and sizeshort <= sizeint and sizeint <= sizelong and + sizefloat <= sizedouble) + +print("platform:") +print(string.format( + "\tshort %d, int %d, long %d, size_t %d, float %d, double %d,\n\z + \tlua Integer %d, lua Number %d", + sizeshort, sizeint, sizelong, sizesize_t, sizefloat, sizedouble, + sizeLI, sizenumber)) +print("\t" .. (little and "little" or "big") .. " endian") +print("\talignment: " .. align) + + +-- check errors in arguments +function checkerror (msg, f, ...) + local status, err = pcall(f, ...) + -- print(status, err, msg) + assert(not status and string.find(err, msg)) +end + +-- minimum behavior for integer formats +assert(unpack("B", pack("B", 0xff)) == 0xff) +assert(unpack("b", pack("b", 0x7f)) == 0x7f) +assert(unpack("b", pack("b", -0x80)) == -0x80) + +assert(unpack("H", pack("H", 0xffff)) == 0xffff) +assert(unpack("h", pack("h", 0x7fff)) == 0x7fff) +assert(unpack("h", pack("h", -0x8000)) == -0x8000) + +assert(unpack("L", pack("L", 0xffffffff)) == 0xffffffff) +assert(unpack("l", pack("l", 0x7fffffff)) == 0x7fffffff) +assert(unpack("l", pack("l", -0x80000000)) == -0x80000000) + + +for i = 1, NB do + -- small numbers with signal extension ("\xFF...") + local s = string.rep("\xff", i) + assert(pack("i" .. i, -1) == s) + assert(packsize("i" .. i) == #s) + assert(unpack("i" .. i, s) == -1) + + -- small unsigned number ("\0...\xAA") + s = "\xAA" .. string.rep("\0", i - 1) + assert(pack("I" .. i, 0xAA) == s:reverse()) + assert(unpack(">I" .. i, s:reverse()) == 0xAA) +end + +do + local lnum = 0x13121110090807060504030201 + local s = pack("i" .. i, ("\xFF"):rep(i - sizeLI) .. s:reverse()) == -lnum) + assert(unpack("i" .. i, "\1" .. ("\x00"):rep(i - 1)) + end +end + +for i = 1, sizeLI do + local lstr = "\1\2\3\4\5\6\7\8\9\10\11\12\13" + local lnum = 0x13121110090807060504030201 + local n = lnum & (~(-1 << (i * 8))) + local s = string.sub(lstr, 1, i) + assert(pack("i" .. i, n) == s:reverse()) + assert(unpack(">i" .. i, s:reverse()) == n) +end + +-- sign extension +do + local u = 0xf0 + for i = 1, sizeLI - 1 do + assert(unpack("I"..i, "\xf0"..("\xff"):rep(i - 1)) == u) + u = u * 256 + 0xff + end +end + +-- mixed endianness +do + assert(pack(">i2 i2", "\10\0\0\20") + assert(a == 10 and b == 20) + assert(pack("=i4", 2001) == pack("i4", 2001)) +end + +print("testing invalid formats") + +checkerror("out of limits", pack, "i0", 0) +checkerror("out of limits", pack, "i" .. NB + 1, 0) +checkerror("out of limits", pack, "!" .. NB + 1, 0) +checkerror("%(17%) out of limits %[1,16%]", pack, "Xi" .. NB + 1) +checkerror("invalid format option 'r'", pack, "i3r", 0) +checkerror("16%-byte integer", unpack, "i16", string.rep('\3', 16)) +checkerror("not power of 2", pack, "!4i3", 0); +checkerror("missing size", pack, "c", "") +checkerror("variable%-length format", packsize, "s") +checkerror("variable%-length format", packsize, "z") + +-- overflow in option size (error will be in digit after limit) +checkerror("invalid format", packsize, "c1" .. string.rep("0", 40)) + +if packsize("i") == 4 then + -- result would be 2^31 (2^3 repetitions of 2^28 strings) + local s = string.rep("c268435456", 2^3) + checkerror("too large", packsize, s) + -- one less is OK + s = string.rep("c268435456", 2^3 - 1) .. "c268435455" + assert(packsize(s) == 0x7fffffff) +end + +-- overflow in packing +for i = 1, sizeLI - 1 do + local umax = (1 << (i * 8)) - 1 + local max = umax >> 1 + local min = ~max + checkerror("overflow", pack, "I" .. i, umax + 1) + + checkerror("overflow", pack, ">i" .. i, umax) + checkerror("overflow", pack, ">i" .. i, max + 1) + checkerror("overflow", pack, "i" .. i, pack(">i" .. i, max)) == max) + assert(unpack("I" .. i, pack(">I" .. i, umax)) == umax) +end + +-- Lua integer size +assert(unpack(">j", pack(">j", math.maxinteger)) == math.maxinteger) +assert(unpack("f", 24)) +end + +print "testing pack/unpack of floating-point numbers" + +for _, n in ipairs{0, -1.1, 1.9, 1/0, -1/0, 1e20, -1e20, 0.1, 2000.7} do + assert(unpack("n", pack("n", n)) == n) + assert(unpack("n", pack(">n", n)) == n) + assert(pack("f", n):reverse()) + assert(pack(">d", n) == pack("f", pack(">f", n)) == n) + assert(unpack("d", pack(">d", n)) == n) +end + +print "testing pack/unpack of strings" +do + local s = string.rep("abc", 1000) + assert(pack("zB", s, 247) == s .. "\0\xF7") + local s1, b = unpack("zB", s .. "\0\xF9") + assert(b == 249 and s1 == s) + s1 = pack("s", s) + assert(unpack("s", s1) == s) + + checkerror("does not fit", pack, "s1", s) + + checkerror("contains zeros", pack, "z", "alo\0"); + + for i = 2, NB do + local s1 = pack("s" .. i, s) + assert(unpack("s" .. i, s1) == s and #s1 == #s + i) + end +end + +do + local x = pack("s", "alo") + checkerror("too short", unpack, "s", x:sub(1, -2)) + checkerror("too short", unpack, "c5", "abcd") + checkerror("out of limits", pack, "s100", "alo") +end + +do + assert(pack("c0", "") == "") + assert(packsize("c0") == 0) + assert(unpack("c0", "") == "") + assert(pack("!4 c6", "abcdef") == "abcdef") + assert(pack("c3", "123") == "123") + assert(pack("c0", "") == "") + assert(pack("c8", "123456") == "123456\0\0") + assert(pack("c88", "") == string.rep("\0", 88)) + assert(pack("c188", "ab") == "ab" .. string.rep("\0", 188 - 2)) + local a, b, c = unpack("!4 z c3", "abcdefghi\0xyz") + assert(a == "abcdefghi" and b == "xyz" and c == 14) + checkerror("longer than", pack, "c3", "1234") +end + + +-- testing multiple types and sequence +do + local x = pack("!8 b Xh i4 i8 c1 Xi8", -12, 100, 200, "\xEC") + assert(#x == packsize(">!8 b Xh i4 i8 c1 Xi8")) + assert(x == "\xf4" .. "\0\0\0" .. + "\0\0\0\100" .. + "\0\0\0\0\0\0\0\xC8" .. + "\xEC" .. "\0\0\0\0\0\0\0") + local a, b, c, d, pos = unpack(">!8 c1 Xh i4 i8 b Xi8 XI XH", x) + assert(a == "\xF4" and b == 100 and c == 200 and d == -20 and (pos - 1) == #x) + + x = pack(">!4 c3 c4 c2 z i4 c5 c2 Xi4", + "abc", "abcd", "xz", "hello", 5, "world", "xy") + assert(x == "abcabcdxzhello\0\0\0\0\0\5worldxy\0") + local a, b, c, d, e, f, g, pos = unpack(">!4 c3 c4 c2 z i4 c5 c2 Xh Xi4", x) + assert(a == "abc" and b == "abcd" and c == "xz" and d == "hello" and + e == 5 and f == "world" and g == "xy" and (pos - 1) % 4 == 0) + + x = pack(" b b Xd b Xb x", 1, 2, 3) + assert(packsize(" b b Xd b Xb x") == 4) + assert(x == "\1\2\3\0") + a, b, c, pos = unpack("bbXdb", x) + assert(a == 1 and b == 2 and c == 3 and pos == #x) + + -- only alignment + assert(packsize("!8 xXi8") == 8) + local pos = unpack("!8 xXi8", "0123456701234567"); assert(pos == 9) + assert(packsize("!8 xXi2") == 2) + local pos = unpack("!8 xXi2", "0123456701234567"); assert(pos == 3) + assert(packsize("!2 xXi2") == 2) + local pos = unpack("!2 xXi2", "0123456701234567"); assert(pos == 3) + assert(packsize("!2 xXi8") == 2) + local pos = unpack("!2 xXi8", "0123456701234567"); assert(pos == 3) + assert(packsize("!16 xXi16") == 16) + local pos = unpack("!16 xXi16", "0123456701234567"); assert(pos == 17) + + checkerror("invalid next option", pack, "X") + checkerror("invalid next option", unpack, "XXi", "") + checkerror("invalid next option", unpack, "X i", "") + checkerror("invalid next option", pack, "Xc1") +end + +do -- testing initial position + local x = pack("i4i4i4i4", 1, 2, 3, 4) + for pos = 1, 16, 4 do + local i, p = unpack("i4", x, pos) + assert(i == pos//4 + 1 and p == pos + 4) + end + + -- with alignment + for pos = 0, 12 do -- will always round position to power of 2 + local i, p = unpack("!4 i4", x, pos + 1) + assert(i == (pos + 3)//4 + 1 and p == i*4 + 1) + end + + -- negative indices + local i, p = unpack("!4 i4", x, -4) + assert(i == 4 and p == 17) + local i, p = unpack("!4 i4", x, -7) + assert(i == 4 and p == 17) + local i, p = unpack("!4 i4", x, -#x) + assert(i == 1 and p == 5) + + -- limits + for i = 1, #x + 1 do + assert(unpack("c0", x, i) == "") + end + checkerror("out of string", unpack, "c0", x, 0) + checkerror("out of string", unpack, "c0", x, #x + 2) + checkerror("out of string", unpack, "c0", x, -(#x + 1)) + +end + +print "OK" + diff --git a/06/parser-gen/parsers/lua-5.3.4-tests/utf8.lua b/06/parser-gen/parsers/lua-5.3.4-tests/utf8.lua new file mode 100644 index 0000000..ebc190b --- /dev/null +++ b/06/parser-gen/parsers/lua-5.3.4-tests/utf8.lua @@ -0,0 +1,210 @@ +-- $Id: utf8.lua,v 1.12 2016/11/07 13:11:28 roberto Exp $ +-- See Copyright Notice in file all.lua + +print "testing UTF-8 library" + +local utf8 = require'utf8' + + +local function checkerror (msg, f, ...) + local s, err = pcall(f, ...) + assert(not s and string.find(err, msg)) +end + + +local function len (s) + return #string.gsub(s, "[\x80-\xBF]", "") +end + + +local justone = "^" .. utf8.charpattern .. "$" + +-- 't' is the list of codepoints of 's' +local function checksyntax (s, t) + local ts = {"return '"} + for i = 1, #t do ts[i + 1] = string.format("\\u{%x}", t[i]) end + ts[#t + 2] = "'" + ts = table.concat(ts) + assert(assert(load(ts))() == s) +end + +assert(utf8.offset("alo", 5) == nil) +assert(utf8.offset("alo", -4) == nil) + +-- 't' is the list of codepoints of 's' +local function check (s, t) + local l = utf8.len(s) + assert(#t == l and len(s) == l) + assert(utf8.char(table.unpack(t)) == s) + + assert(utf8.offset(s, 0) == 1) + + checksyntax(s, t) + + local t1 = {utf8.codepoint(s, 1, -1)} + assert(#t == #t1) + for i = 1, #t do assert(t[i] == t1[i]) end + + for i = 1, l do + local pi = utf8.offset(s, i) -- position of i-th char + local pi1 = utf8.offset(s, 2, pi) -- position of next char + assert(string.find(string.sub(s, pi, pi1 - 1), justone)) + assert(utf8.offset(s, -1, pi1) == pi) + assert(utf8.offset(s, i - l - 1) == pi) + assert(pi1 - pi == #utf8.char(utf8.codepoint(s, pi))) + for j = pi, pi1 - 1 do + assert(utf8.offset(s, 0, j) == pi) + end + for j = pi + 1, pi1 - 1 do + assert(not utf8.len(s, j)) + end + assert(utf8.len(s, pi, pi) == 1) + assert(utf8.len(s, pi, pi1 - 1) == 1) + assert(utf8.len(s, pi) == l - i + 1) + assert(utf8.len(s, pi1) == l - i) + assert(utf8.len(s, 1, pi) == i) + end + + local i = 0 + for p, c in utf8.codes(s) do + i = i + 1 + assert(c == t[i] and p == utf8.offset(s, i)) + assert(utf8.codepoint(s, p) == c) + end + assert(i == #t) + + i = 0 + for p, c in utf8.codes(s) do + i = i + 1 + assert(c == t[i] and p == utf8.offset(s, i)) + end + assert(i == #t) + + i = 0 + for c in string.gmatch(s, utf8.charpattern) do + i = i + 1 + assert(c == utf8.char(t[i])) + end + assert(i == #t) + + for i = 1, l do + assert(utf8.offset(s, i) == utf8.offset(s, i - l - 1, #s + 1)) + end + +end + + +do -- error indication in utf8.len + local function check (s, p) + local a, b = utf8.len(s) + assert(not a and b == p) + end + check("abc\xE3def", 4) + check("汉字\x80", #("汉字") + 1) + check("\xF4\x9F\xBF", 1) + check("\xF4\x9F\xBF\xBF", 1) +end + +-- error in utf8.codes +checkerror("invalid UTF%-8 code", + function () + local s = "ab\xff" + for c in utf8.codes(s) do assert(c) end + end) + + +-- error in initial position for offset +checkerror("position out of range", utf8.offset, "abc", 1, 5) +checkerror("position out of range", utf8.offset, "abc", 1, -4) +checkerror("position out of range", utf8.offset, "", 1, 2) +checkerror("position out of range", utf8.offset, "", 1, -1) +checkerror("continuation byte", utf8.offset, "𦧺", 1, 2) +checkerror("continuation byte", utf8.offset, "𦧺", 1, 2) +checkerror("continuation byte", utf8.offset, "\x80", 1) + + + +local s = "hello World" +local t = {string.byte(s, 1, -1)} +for i = 1, utf8.len(s) do assert(t[i] == string.byte(s, i)) end +check(s, t) + +check("汉字/漢字", {27721, 23383, 47, 28450, 23383,}) + +do + local s = "áéí\128" + local t = {utf8.codepoint(s,1,#s - 1)} + assert(#t == 3 and t[1] == 225 and t[2] == 233 and t[3] == 237) + checkerror("invalid UTF%-8 code", utf8.codepoint, s, 1, #s) + checkerror("out of range", utf8.codepoint, s, #s + 1) + t = {utf8.codepoint(s, 4, 3)} + assert(#t == 0) + checkerror("out of range", utf8.codepoint, s, -(#s + 1), 1) + checkerror("out of range", utf8.codepoint, s, 1, #s + 1) +end + +assert(utf8.char() == "") +assert(utf8.char(97, 98, 99) == "abc") + +assert(utf8.codepoint(utf8.char(0x10FFFF)) == 0x10FFFF) + +checkerror("value out of range", utf8.char, 0x10FFFF + 1) + +local function invalid (s) + checkerror("invalid UTF%-8 code", utf8.codepoint, s) + assert(not utf8.len(s)) +end + +-- UTF-8 representation for 0x11ffff (value out of valid range) +invalid("\xF4\x9F\xBF\xBF") + +-- overlong sequences +invalid("\xC0\x80") -- zero +invalid("\xC1\xBF") -- 0x7F (should be coded in 1 byte) +invalid("\xE0\x9F\xBF") -- 0x7FF (should be coded in 2 bytes) +invalid("\xF0\x8F\xBF\xBF") -- 0xFFFF (should be coded in 3 bytes) + + +-- invalid bytes +invalid("\x80") -- continuation byte +invalid("\xBF") -- continuation byte +invalid("\xFE") -- invalid byte +invalid("\xFF") -- invalid byte + + +-- empty string +check("", {}) + +-- minimum and maximum values for each sequence size +s = "\0 \x7F\z + \xC2\x80 \xDF\xBF\z + \xE0\xA0\x80 \xEF\xBF\xBF\z + \xF0\x90\x80\x80 \xF4\x8F\xBF\xBF" +s = string.gsub(s, " ", "") +check(s, {0,0x7F, 0x80,0x7FF, 0x800,0xFFFF, 0x10000,0x10FFFF}) + +x = "日本語a-4\0éó" +check(x, {26085, 26412, 35486, 97, 45, 52, 0, 233, 243}) + + +-- Supplementary Characters +check("𣲷𠜎𠱓𡁻𠵼ab𠺢", + {0x23CB7, 0x2070E, 0x20C53, 0x2107B, 0x20D7C, 0x61, 0x62, 0x20EA2,}) + +check("𨳊𩶘𦧺𨳒𥄫𤓓\xF4\x8F\xBF\xBF", + {0x28CCA, 0x29D98, 0x269FA, 0x28CD2, 0x2512B, 0x244D3, 0x10ffff}) + + +local i = 0 +for p, c in string.gmatch(x, "()(" .. utf8.charpattern .. ")") do + i = i + 1 + assert(utf8.offset(x, i) == p) + assert(utf8.len(x, p) == utf8.len(x) - i + 1) + assert(utf8.len(c) == 1) + for j = 1, #c - 1 do + assert(utf8.offset(x, 0, p + j - 1) == p) + end +end + +print'ok' + diff --git a/06/parser-gen/parsers/lua-5.3.4-tests/vararg.lua b/06/parser-gen/parsers/lua-5.3.4-tests/vararg.lua new file mode 100644 index 0000000..d617a98 --- /dev/null +++ b/06/parser-gen/parsers/lua-5.3.4-tests/vararg.lua @@ -0,0 +1,142 @@ +-- $Id: vararg.lua,v 1.25 2016/11/07 13:11:28 roberto Exp $ +-- See Copyright Notice in file all.lua + +print('testing vararg') + +function f(a, ...) + local arg = {n = select('#', ...), ...} + for i=1,arg.n do assert(a[i]==arg[i]) end + return arg.n +end + +function c12 (...) + assert(arg == _G.arg) -- no local 'arg' + local x = {...}; x.n = #x + local res = (x.n==2 and x[1] == 1 and x[2] == 2) + if res then res = 55 end + return res, 2 +end + +function vararg (...) return {n = select('#', ...), ...} end + +local call = function (f, args) return f(table.unpack(args, 1, args.n)) end + +assert(f() == 0) +assert(f({1,2,3}, 1, 2, 3) == 3) +assert(f({"alo", nil, 45, f, nil}, "alo", nil, 45, f, nil) == 5) + +assert(c12(1,2)==55) +a,b = assert(call(c12, {1,2})) +assert(a == 55 and b == 2) +a = call(c12, {1,2;n=2}) +assert(a == 55 and b == 2) +a = call(c12, {1,2;n=1}) +assert(not a) +assert(c12(1,2,3) == false) +local a = vararg(call(next, {_G,nil;n=2})) +local b,c = next(_G) +assert(a[1] == b and a[2] == c and a.n == 2) +a = vararg(call(call, {c12, {1,2}})) +assert(a.n == 2 and a[1] == 55 and a[2] == 2) +a = call(print, {'+'}) +assert(a == nil) + +local t = {1, 10} +function t:f (...) local arg = {...}; return self[...]+#arg end +assert(t:f(1,4) == 3 and t:f(2) == 11) +print('+') + +lim = 20 +local i, a = 1, {} +while i <= lim do a[i] = i+0.3; i=i+1 end + +function f(a, b, c, d, ...) + local more = {...} + assert(a == 1.3 and more[1] == 5.3 and + more[lim-4] == lim+0.3 and not more[lim-3]) +end + +function g(a,b,c) + assert(a == 1.3 and b == 2.3 and c == 3.3) +end + +call(f, a) +call(g, a) + +a = {} +i = 1 +while i <= lim do a[i] = i; i=i+1 end +assert(call(math.max, a) == lim) + +print("+") + + +-- new-style varargs + +function oneless (a, ...) return ... end + +function f (n, a, ...) + local b + assert(arg == _G.arg) -- no local 'arg' + if n == 0 then + local b, c, d = ... + return a, b, c, d, oneless(oneless(oneless(...))) + else + n, b, a = n-1, ..., a + assert(b == ...) + return f(n, a, ...) + end +end + +a,b,c,d,e = assert(f(10,5,4,3,2,1)) +assert(a==5 and b==4 and c==3 and d==2 and e==1) + +a,b,c,d,e = f(4) +assert(a==nil and b==nil and c==nil and d==nil and e==nil) + + +-- varargs for main chunks +f = load[[ return {...} ]] +x = f(2,3) +assert(x[1] == 2 and x[2] == 3 and x[3] == nil) + + +f = load[[ + local x = {...} + for i=1,select('#', ...) do assert(x[i] == select(i, ...)) end + assert(x[select('#', ...)+1] == nil) + return true +]] + +assert(f("a", "b", nil, {}, assert)) +assert(f()) + +a = {select(3, table.unpack{10,20,30,40})} +assert(#a == 2 and a[1] == 30 and a[2] == 40) +a = {select(1)} +assert(next(a) == nil) +a = {select(-1, 3, 5, 7)} +assert(a[1] == 7 and a[2] == nil) +a = {select(-2, 3, 5, 7)} +assert(a[1] == 5 and a[2] == 7 and a[3] == nil) +pcall(select, 10000) +pcall(select, -10000) + + +-- bug in 5.2.2 + +function f(p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, +p11, p12, p13, p14, p15, p16, p17, p18, p19, p20, +p21, p22, p23, p24, p25, p26, p27, p28, p29, p30, +p31, p32, p33, p34, p35, p36, p37, p38, p39, p40, +p41, p42, p43, p44, p45, p46, p48, p49, p50, ...) + local a1,a2,a3,a4,a5,a6,a7 + local a8,a9,a10,a11,a12,a13,a14 +end + +-- assertion fail here +f() + + +print('OK') + diff --git a/06/parser-gen/parsers/lua-5.3.4-tests/verybig.lua b/06/parser-gen/parsers/lua-5.3.4-tests/verybig.lua new file mode 100644 index 0000000..1cfd10b --- /dev/null +++ b/06/parser-gen/parsers/lua-5.3.4-tests/verybig.lua @@ -0,0 +1,152 @@ +-- $Id: verybig.lua,v 1.25 2016/11/07 13:11:28 roberto Exp $ +-- See Copyright Notice in file all.lua + +print "testing RK" + +-- testing opcodes with RK arguments larger than K limit +local function foo () + local dummy = { + -- fill first 256 entries in table of constants + 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, + 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, + 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, + 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, + 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, + 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, + 97, 98, 99, 100, 101, 102, 103, 104, + 105, 106, 107, 108, 109, 110, 111, 112, + 113, 114, 115, 116, 117, 118, 119, 120, + 121, 122, 123, 124, 125, 126, 127, 128, + 129, 130, 131, 132, 133, 134, 135, 136, + 137, 138, 139, 140, 141, 142, 143, 144, + 145, 146, 147, 148, 149, 150, 151, 152, + 153, 154, 155, 156, 157, 158, 159, 160, + 161, 162, 163, 164, 165, 166, 167, 168, + 169, 170, 171, 172, 173, 174, 175, 176, + 177, 178, 179, 180, 181, 182, 183, 184, + 185, 186, 187, 188, 189, 190, 191, 192, + 193, 194, 195, 196, 197, 198, 199, 200, + 201, 202, 203, 204, 205, 206, 207, 208, + 209, 210, 211, 212, 213, 214, 215, 216, + 217, 218, 219, 220, 221, 222, 223, 224, + 225, 226, 227, 228, 229, 230, 231, 232, + 233, 234, 235, 236, 237, 238, 239, 240, + 241, 242, 243, 244, 245, 246, 247, 248, + 249, 250, 251, 252, 253, 254, 255, 256, + } + assert(24.5 + 0.6 == 25.1) + local t = {foo = function (self, x) return x + self.x end, x = 10} + t.t = t + assert(t:foo(1.5) == 11.5) + assert(t.t:foo(0.5) == 10.5) -- bug in 5.2 alpha + assert(24.3 == 24.3) + assert((function () return t.x end)() == 10) +end + + +foo() +foo = nil + +if _soft then return 10 end + +print "testing large programs (>64k)" + +-- template to create a very big test file +prog = [[$ + +local a,b + +b = {$1$ + b30009 = 65534, + b30010 = 65535, + b30011 = 65536, + b30012 = 65537, + b30013 = 16777214, + b30014 = 16777215, + b30015 = 16777216, + b30016 = 16777217, + b30017 = 0x7fffff, + b30018 = -0x7fffff, + b30019 = 0x1ffffff, + b30020 = -0x1ffffd, + b30021 = -65534, + b30022 = -65535, + b30023 = -65536, + b30024 = -0xffffff, + b30025 = 15012.5, + $2$ +}; + +assert(b.a50008 == 25004 and b["a11"] == -5.5) +assert(b.a33007 == -16503.5 and b.a50009 == -25004.5) +assert(b["b"..30024] == -0xffffff) + +function b:xxx (a,b) return a+b end +assert(b:xxx(10, 12) == 22) -- pushself with non-constant index +b.xxx = nil + +s = 0; n=0 +for a,b in pairs(b) do s=s+b; n=n+1 end +-- with 32-bit floats, exact value of 's' depends on summation order +assert(81800000.0 < s and s < 81860000 and n == 70001) + +a = nil; b = nil +print'+' + +function f(x) b=x end + +a = f{$3$} or 10 + +assert(a==10) +assert(b[1] == "a10" and b[2] == 5 and b[#b-1] == "a50009") + + +function xxxx (x) return b[x] end + +assert(xxxx(3) == "a11") + +a = nil; b=nil +xxxx = nil + +return 10 + +]] + +-- functions to fill in the $n$ + +local function sig (x) + return (x % 2 == 0) and '' or '-' +end + +F = { +function () -- $1$ + for i=10,50009 do + io.write('a', i, ' = ', sig(i), 5+((i-10)/2), ',\n') + end +end, + +function () -- $2$ + for i=30026,50009 do + io.write('b', i, ' = ', sig(i), 15013+((i-30026)/2), ',\n') + end +end, + +function () -- $3$ + for i=10,50009 do + io.write('"a', i, '", ', sig(i), 5+((i-10)/2), ',\n') + end +end, +} + +file = os.tmpname() +io.output(file) +for s in string.gmatch(prog, "$([^$]+)") do + local n = tonumber(s) + if not n then io.write(s) else F[n]() end +end +io.close() +result = dofile(file) +assert(os.remove(file)) +print'OK' +return result + diff --git a/06/parser-gen/parsers/lua-parser-tests.lua b/06/parser-gen/parsers/lua-parser-tests.lua new file mode 100644 index 0000000..d808518 --- /dev/null +++ b/06/parser-gen/parsers/lua-parser-tests.lua @@ -0,0 +1,799 @@ +local lua = require "lua-parser" +local peg = require "peg-parser" + +local eq = require "equals" +local equals = eq.equals +print("\n\n [[ PARSING LUA TEST SUITE FILES ]] \n\n") +local filenames = { +'all.lua', +'main.lua', +'gc.lua', +'db.lua', +'calls.lua', +'strings.lua', +'literals.lua', +'tpack.lua', +'attrib.lua', +'locals.lua', +'constructs.lua', +'code.lua', +'big.lua', +'nextvar.lua', +'pm.lua', +'utf8.lua', +'api.lua', +'events.lua', +'vararg.lua', +'closure.lua', +'coroutine.lua', +'goto.lua', +'errors.lua', +'math.lua', +'sort.lua', +'bitwise.lua', +'verybig.lua', +'files.lua', +} +local errs = 0 +for k,v in ipairs(filenames) do + local filename = "lua-5.3.4-tests/"..v + local f = assert(io.open(filename, "r")) + + local t = f:read("*all") + + local res, err = lua.parse(t) + local s = "OK" + if not res then s = "FAIL" end -- only check if succesful since grammar ensures whole file is read + print("Testing file '"..v.."': ["..s.."]") + if not res then + errs = errs + 1 + print("Error: "..err[1]["msg"]) + end + f:close() +end +assert(errs == 0) + +print("\n\n Test suite files compiled successfully") + + +print("\n\n [[ TESTING ERROR LABELS ]] ") +local pr = peg.print_r +-- test errors +local s,res, err +local ErrExtra="unexpected character(s), expected EOF" +s = [[ return; ! ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrExtra) + +local ErrInvalidStat="unexpected token, invalid start of statement" +s = [[ ! ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrInvalidStat) + + +local ErrEndIf="expected 'end' to close the if statement" + +s = [[ if c then b=1 ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrEndIf) + +local ErrExprIf="expected a condition after 'if'" + +s = [[ if then b=1 end]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrExprIf) + +local ErrThenIf="expected 'then' after the condition" + +s = [[ if c b=1 end ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrThenIf) + +local ErrExprEIf="expected a condition after 'elseif'" + +s = [[ if a then b=1 elseif then d=1 end ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrExprEIf) + +local ErrThenEIf="expected 'then' after the condition" + +s = [[ if a b=1 end]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrThenEIf) + +local ErrEndDo="expected 'end' to close the do block" + +s = [[ do x=1 ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrEndDo) + +local ErrExprWhile="expected a condition after 'while'" + +s = [[ while do c=1 end]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrExprWhile) + +local ErrDoWhile="expected 'do' after the condition" + +s = [[ while a c=1 end ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrDoWhile) + +local ErrEndWhile="expected 'end' to close the while loop" + +s = [[ while a do b=1]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrEndWhile) + +local ErrUntilRep="expected 'until' at the end of the repeat loop" + +s = [[ repeat c=1 ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrUntilRep) + +local ErrExprRep="expected a conditions after 'until'" + +s = [[ repeat c=1 until ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrExprRep) + +local ErrForRange="expected a numeric or generic range after 'for'" + +s = [[ for 3,4 do x=1 end]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrForRange) + +local ErrEndFor="expected 'end' to close the for loop" + +s = [[ for c=1,3 do a=1 ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrEndFor) + +local ErrExprFor1="expected a starting expression for the numeric range" + +s = [[ for a=,4 do a=1 end]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrExprFor1) + +local ErrCommaFor="expected ',' to split the start and end of the range" + +s = [[ for a=4 5 do a=1 end]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrCommaFor) + +local ErrExprFor2="expected an ending expression for the numeric range" + +s = [[ for a=4, do a=1 end]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrExprFor2) + +local ErrExprFor3="expected a step expression for the numeric range after ','" + +s = [[ for a=1,2, do a=1 end ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrExprFor3) + +local ErrInFor="expected '=' or 'in' after the variable(s)" + +s = [[ for a of 1 do a=1 end]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrInFor) + +local ErrEListFor="expected one or more expressions after 'in'" + +s = [[ for a in do a=1 end ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrEListFor) + +local ErrDoFor="expected 'do' after the range of the for loop" + +s = [[ for a=1,2 a=1 end ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrDoFor) + +local ErrDefLocal="expected a function definition or assignment after local" + +s = [[ local return c ]] + +print("Parsing '"..s.."'") +res, err = lua.parse(s) + +assert(err[1]["msg"] == ErrDefLocal) + + +local ErrNameLFunc="expected a function name after 'function'" + +s = [[ local function() c=1 end ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrNameLFunc) + + +local ErrEListLAssign="expected one or more expressions after '='" + +s = [[ local a = return b ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrEListLAssign) + +local ErrEListAssign="expected one or more expressions after '='" + +s = [[ a = return b ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrEListAssign) + + +local ErrFuncName="expected a function name after 'function'" + +s = [[ function () a=1 end ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrFuncName) + +local ErrNameFunc1="expected a function name after '.'" + +s = [[ function a.() a=1 end ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrNameFunc1) + +local ErrNameFunc2="expected a method name after ':'" + +s = [[ function a:() a=1 end ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrNameFunc2) + +local ErrOParenPList="expected '(' for the parameter list" + +s = [[ function a b=1 end]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrOParenPList) + +local ErrCParenPList="expected ')' to close the parameter list" + +s = [[ +function a( + b=1 + +end +]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrCParenPList) + +local ErrEndFunc="expected 'end' to close the function body" + +s = [[ function a() b=1 ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrEndFunc) + +local ErrParList="expected a variable name or '...' after ','" + +s = [[ function a(b, ) b=1 end ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrParList) + + +local ErrLabel="expected a label name after '::'" + +s = [[ :: return b ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrLabel) + +local ErrCloseLabel="expected '::' after the label" + +s = [[ :: abc return a]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrCloseLabel) + +local ErrGoto="expected a label after 'goto'" + +s = [[ goto return c]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrGoto) + + + +local ErrVarList="expected a variable name after ','" + +s = [[ abc, + = 3]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) + +assert(err[1]["msg"] == ErrVarList) + +local ErrExprList="expected an expression after ','" + +s = [[ return a,;]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrExprList) + + +local ErrOrExpr="expected an expression after 'or'" + +s = [[ return a or; ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrOrExpr) + +local ErrAndExpr="expected an expression after 'and'" + +s = [[ return a and;]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrAndExpr) + +local ErrRelExpr="expected an expression after the relational operator" + +s = [[ return a >;]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrRelExpr) + + +local ErrBitwiseExpr="expected an expression after bitwise operator" + +s = [[ return b & ; ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrBitwiseExpr) + +local ErrConcatExpr="expected an expression after '..'" + +s = [[ print(a..) ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrConcatExpr) + +local ErrAddExpr="expected an expression after the additive operator" + +s = [[ return a - ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrAddExpr) + +local ErrMulExpr="expected an expression after the multiplicative operator" + +s = [[ return a/ ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrMulExpr) + +local ErrUnaryExpr="expected an expression after the unary operator" + +s = [[ return # ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrUnaryExpr) + +local ErrPowExpr="expected an expression after '^'" + +s = [[ return a^ ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrPowExpr) + + +local ErrExprParen="expected an expression after '('" + +s = [[ return a + () ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrExprParen) + +local ErrCParenExpr="expected ')' to close the expression" + +s = [[ return a + (a ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrCParenExpr) + +local ErrNameIndex="expected a field name after '.'" + +s = [[ return a. ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrNameIndex) + +local ErrExprIndex="expected an expression after '['" + +s = [[ return a [ ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrExprIndex) + +local ErrCBracketIndex="expected ']' to close the indexing expression" + +s = [[ return a[1 ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrCBracketIndex) + +local ErrNameMeth="expected a method name after ':'" + +s = [[ return a: ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrNameMeth) + +local ErrMethArgs="expected some arguments for the method call (or '()')" +s = [[ a:b ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrMethArgs) + + + +local ErrCParenArgs="expected ')' to close the argument list" + +s = [[ return a(c ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrCParenArgs) + + +local ErrCBraceTable="expected '}' to close the table constructor" + +s = [[ return { ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrCBraceTable) + +local ErrEqField="expected '=' after the table key" + +s = [[ a = {[b] b} ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrEqField) + +local ErrExprField="expected an expression after '='" + +s = [[ a = {[a] = } ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrExprField) + +local ErrExprFKey="expected an expression after '[' for the table key" + +s = [[ a = {[ = b} ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrExprFKey) + +local ErrCBracketFKey="expected ']' to close the table key" + +s = [[ a = {[a = b} ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrCBracketFKey) + + +local ErrDigitHex="expected one or more hexadecimal digits after '0x'" + +s = [[ a = 0x ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrDigitHex) + +local ErrDigitDeci="expected one or more digits after the decimal point" + +s = [[ a = . ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrDigitDeci) + +local ErrDigitExpo="expected one or more digits for the exponent" + + +s = [[ a = 1.0e ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrDigitExpo) + +local ErrQuote="unclosed string" + +s = [[ a = ";]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrQuote) + +local ErrHexEsc="expected exactly two hexadecimal digits after '\\x'" + +s = [[ a = "a\x1" ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrHexEsc) + +local ErrOBraceUEsc="expected '{' after '\\u'" + +s = [[ a = "a\u" ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrOBraceUEsc) + +local ErrDigitUEsc="expected one or more hexadecimal digits for the UTF-8 code point" + +s = [[ a = "\u{}"]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrDigitUEsc) + +local ErrCBraceUEsc="expected '}' after the code point" + +s = [[ a = "\u{12" ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrCBraceUEsc) + +local ErrEscSeq="invalid escape sequence" + +s = [[ a = "\;" ]] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrEscSeq) + +local ErrCloseLStr="unclosed long string" + + +s = [==[ a = [[ abc return; ]==] +print("Parsing '"..s.."'") +res, err = lua.parse(s) +assert(err[1]["msg"] == ErrCloseLStr) + +print("\n\n All error labels generated successfully") + +print("\n\n [[ TESTING AST GENERATION ]]\n\n ") + +-- TODO: AST + +s = [[ +if abc > 123 then + abc=123 +end]] +rez = { + rule='chunk', + pos=3, + { + rule='block', + pos=3, + { + rule='stat', + pos=3, + 'if', + { + rule='exp', + pos=6, + { + rule='exp', + { + rule='exp', + { + rule='expTokens', + pos=6, + { + rule='prefixexp', + pos=6, + { + rule='varOrExp', + pos=6, + { + rule='var', + pos=6, + { + rule='NAME', + pos=6, + 'abc', + }, + }, + }, + }, + }, + }, + { + rule='operatorComparison', + pos=10, + '>', + }, + { + rule='expTokens', + pos=12, + { + rule='number', + pos=12, + { + rule='INT', + pos=12, + '123', + }, + }, + }, + }, + }, + 'then', + { + rule='block', + pos=23, + { + rule='stat', + pos=23, + { + rule='varlist', + pos=23, + { + rule='var', + pos=23, + { + rule='NAME', + pos=23, + 'abc', + }, + }, + }, + '=', + { + rule='explist', + pos=27, + { + rule='exp', + pos=27, + { + rule='expTokens', + pos=27, + { + rule='number', + pos=27, + { + rule='INT', + pos=27, + '123', + }, + }, + }, + }, + }, + }, + }, + 'end', + }, + }, + + +} + + +print("Parsing '"..s.."'") +res, err = lua.parse(s) +peg.print_t(res) +assert(equals(res,rez)) + +s = [[ +local a = [=[ long string ]=] + +-- aaa +return a +--[==[ hi + +]==] +]] +rez = { + + rule='chunk', + pos=3, + { + rule='block', + pos=3, + { + rule='stat', + pos=3, + 'local', + { + rule='localAssign', + pos=9, + { + rule='namelist', + pos=9, + { + rule='NAME', + pos=9, + 'a', + }, + }, + '=', + { + rule='explist', + pos=13, + { + rule='exp', + pos=13, + { + rule='expTokens', + pos=13, + { + rule='string', + pos=13, + ' long string ', + }, + }, + }, + }, + }, + }, + { + rule='retstat', + pos=41, + 'return', + { + rule='explist', + pos=48, + { + rule='exp', + pos=48, + { + rule='expTokens', + pos=48, + { + rule='prefixexp', + pos=48, + { + rule='varOrExp', + pos=48, + { + rule='var', + pos=48, + { + rule='NAME', + pos=48, + 'a', + }, + }, + }, + }, + }, + }, + }, + }, + }, + + + +} +print("Parsing '"..s.."'") +res, err = lua.parse(s) +peg.print_t(res) +assert(equals(res,rez)) + +print("\n\n All AST's generated successfully") + +print("\n\nAll tests passed!") \ No newline at end of file diff --git a/06/parser-gen/parsers/lua-parser.lua b/06/parser-gen/parsers/lua-parser.lua new file mode 100644 index 0000000..c87a3a5 --- /dev/null +++ b/06/parser-gen/parsers/lua-parser.lua @@ -0,0 +1,291 @@ +--[==[ +Parser for Lua 5.3 +Based on https://github.com/antlr/grammars-v4/blob/master/lua/Lua.g4 and https://github.com/andremm/lua-parser/blob/master/lua-parser/parser.lua +]==] +package.path = package.path .. ";../?.lua" +local pg = require "parser-gen" +function equals(s,i,a,b) return #a == #b end +function fixexp (...) + local exp = {...} + local len = #exp + if len > 1 then + exp.rule = "exp" + exp[len].rule = "exp" + return exp + elseif exp[1] then + if exp[1].rule == "expTokens" then + return exp[1] + else + return exp[1][1] + end + end +end +function fold (...) + local exp = {...} + local len = #exp + if len > 1 then + local folded = { rule = "exp", fixexp(exp[1]) } + for i = 2, len, 2 do + folded = { rule = "exp", folded, exp[i], fixexp(exp[i+1]) } + end + return folded + elseif exp[1] then + return exp[1][1] + end +end +-- from https://github.com/andremm/lua-parser/blob/master/lua-parser/parser.lua +local labels = { + ErrExtra="unexpected character(s), expected EOF", + ErrInvalidStat={"unexpected token, invalid start of statement",[[ (!%nl .)* ]]}, + + ErrEndIf="expected 'end' to close the if statement", + ErrExprIf="expected a condition after 'if'", + ErrThenIf="expected 'then' after the condition", + ErrExprEIf="expected a condition after 'elseif'", + ErrThenEIf="expected 'then' after the condition", + + ErrEndDo="expected 'end' to close the do block", + ErrExprWhile="expected a condition after 'while'", + ErrDoWhile="expected 'do' after the condition", + ErrEndWhile="expected 'end' to close the while loop", + ErrUntilRep="expected 'until' at the end of the repeat loop", + ErrExprRep="expected a conditions after 'until'", + + ErrForRange="expected a numeric or generic range after 'for'", + ErrEndFor="expected 'end' to close the for loop", + ErrExprFor1="expected a starting expression for the numeric range", + ErrCommaFor="expected ',' to split the start and end of the range", + ErrExprFor2="expected an ending expression for the numeric range", + ErrExprFor3={"expected a step expression for the numeric range after ','",[[ (!'do' !%nl .)* ]]}, + ErrInFor="expected '=' or 'in' after the variable(s)", + ErrEListFor="expected one or more expressions after 'in'", + ErrDoFor="expected 'do' after the range of the for loop", + + ErrDefLocal="expected a function definition or assignment after local", + ErrNameLFunc="expected a function name after 'function'", + ErrEListLAssign="expected one or more expressions after '='", + ErrEListAssign="expected one or more expressions after '='", + + ErrFuncName="expected a function name after 'function'", + ErrNameFunc1="expected a function name after '.'", + ErrNameFunc2="expected a method name after ':'", + ErrOParenPList="expected '(' for the parameter list", + ErrCParenPList="expected ')' to close the parameter list", + ErrEndFunc="expected 'end' to close the function body", + ErrParList="expected a variable name or '...' after ','", + + ErrLabel="expected a label name after '::'", + ErrCloseLabel="expected '::' after the label", + ErrGoto="expected a label after 'goto'", + + ErrVarList={"expected a variable name after ','",[[ (!'=' !%nl .)* ]]}, + ErrExprList="expected an expression after ','", + + ErrOrExpr="expected an expression after 'or'", + ErrAndExpr="expected an expression after 'and'", + ErrRelExpr="expected an expression after the relational operator", + + ErrBitwiseExpr="expected an expression after bitwise operator", + + ErrConcatExpr="expected an expression after '..'", + ErrAddExpr="expected an expression after the additive operator", + ErrMulExpr="expected an expression after the multiplicative operator", + ErrUnaryExpr="expected an expression after the unary operator", + ErrPowExpr="expected an expression after '^'", + + ErrExprParen="expected an expression after '('", + ErrCParenExpr="expected ')' to close the expression", + ErrNameIndex="expected a field name after '.'", + ErrExprIndex="expected an expression after '['", + ErrCBracketIndex="expected ']' to close the indexing expression", + ErrNameMeth="expected a method name after ':'", + ErrMethArgs="expected some arguments for the method call (or '()')", + + + ErrCParenArgs="expected ')' to close the argument list", + + ErrCBraceTable="expected '}' to close the table constructor", + ErrEqField="expected '=' after the table key", + ErrExprField="expected an expression after '='", + ErrExprFKey={"expected an expression after '[' for the table key",[[ (!']' !%nl .)* ]] }, + ErrCBracketFKey={"expected ']' to close the table key",[[ (!'=' !%nl .)* ]]}, + + ErrDigitHex="expected one or more hexadecimal digits after '0x'", + ErrDigitDeci="expected one or more digits after the decimal point", + ErrDigitExpo="expected one or more digits for the exponent", + + ErrQuote="unclosed string", + ErrHexEsc={"expected exactly two hexadecimal digits after '\\x'",[[ (!('"' / "'" / %nl) .)* ]]}, + ErrOBraceUEsc="expected '{' after '\\u'", + ErrDigitUEsc={"expected one or more hexadecimal digits for the UTF-8 code point",[[ (!'}' !%nl .)* ]]}, + ErrCBraceUEsc={"expected '}' after the code point",[[ (!('"' / "'") .)* ]]}, + ErrEscSeq={"invalid escape sequence",[[ (!('"' / "'" / %nl) .)* ]]}, + ErrCloseLStr="unclosed long string", + ErrEqAssign="expected '=' after variable list in assign statement" +} +pg.setlabels(labels) +local grammar = pg.compile([==[ + chunk <- block (!.)^ErrExtra + block <- stat* retstat? + stat <- ';' / + functioncall / + varlist '='^ErrEqAssign explist^ErrEListAssign / + 'break' / + 'goto' NAME^ErrGoto / + 'do' block 'end'^ErrEndDo / + 'while' exp^ErrExprWhile 'do'^ErrDoWhile block 'end'^ErrEndWhile / + 'repeat' block 'until'^ErrUntilRep exp^ErrExprRep / + 'if' exp^ErrExprIf 'then'^ErrThenIf block ('elseif' exp^ErrExprEIf 'then'^ErrThenEIf block)* ('else' block)? 'end'^ErrEndIf / + 'for' (forNum / forIn)^ErrForRange 'do'^ErrDoFor block 'end'^ErrEndFor / + + 'function' funcname^ErrFuncName funcbody / + 'local' (localAssign / localFunc)^ErrDefLocal / + label / + !blockEnd %{ErrInvalidStat} + blockEnd <- 'return' / 'end' / 'elseif' / 'else' / 'until' / !. + retstat <- 'return' explist? ';'? + forNum <- NAME '=' exp^ErrExprFor1 ','^ErrCommaFor exp^ErrExprFor2 (',' exp^ErrExprFor3)? + forIn <- namelist 'in'^ErrInFor explist^ErrEListFor + localFunc <- 'function' NAME^ErrNameLFunc funcbody + localAssign <- namelist ('=' explist^ErrEListLAssign)? + label <- '::' NAME^ErrLabel '::'^ErrCloseLabel + funcname <- NAME ('.' NAME^ErrNameFunc1)* (':' NAME^ErrNameFunc2)? + varlist <- var (',' var^ErrVarList)* + namelist <- NAME (',' NAME)* + explist <- exp (',' exp^ErrExprList )* + + exp <- expOR -> fixexp + expOR <- (expAND (operatorOr expAND^ErrOrExpr)*) -> fold + expAND <- (expREL (operatorAnd expREL^ErrAndExpr)*) -> fold + expREL <- (expBIT (operatorComparison expBIT^ErrRelExpr)*) -> fold + expBIT <- (expCAT (operatorBitwise expCAT^ErrBitwiseExpr)*) -> fold + expCAT <- (expADD (operatorStrcat expCAT^ErrConcatExpr)?) -> fixexp + expADD <- (expMUL (operatorAddSub expMUL^ErrAddExpr)*) -> fold + expMUL <- (expUNA (operatorMulDivMod expUNA^ErrMulExpr)*) -> fold + expUNA <- ((operatorUnary expUNA^ErrUnaryExpr) / expPOW) -> fixexp + expPOW <- (expTokens (operatorPower expUNA^ErrPowExpr)?) -> fixexp + + expTokens <- 'nil' / 'false' / 'true' / + number / + string / + '...' / + 'function' funcbody / + tableconstructor / + prefixexp + + prefixexp <- varOrExp nameAndArgs* + functioncall <- varOrExp nameAndArgs+ + varOrExp <- var / brackexp + brackexp <- '(' exp^ErrExprParen ')'^ErrCParenExpr + var <- (NAME / brackexp varSuffix) varSuffix* + varSuffix <- nameAndArgs* ('[' exp^ErrExprIndex ']'^ErrCBracketIndex / '.' !'.' NAME^ErrNameIndex) + nameAndArgs <- (':' !':' NAME^ErrNameMeth args^ErrMethArgs) / + args + args <- '(' explist? ')'^ErrCParenArgs / tableconstructor / string + funcbody <- '('^ErrOParenPList parlist? ')'^ErrCParenPList block 'end'^ErrEndFunc + parlist <- namelist (',' '...'^ErrParList)? / '...' + tableconstructor<- '{' fieldlist? '}'^ErrCBraceTable + fieldlist <- field (fieldsep field)* fieldsep? + field <- !OPEN '[' exp^ErrExprFKey ']'^ErrCBracketFKey '='^ErrEqField exp^ErrExprField / + NAME '=' exp / + exp + fieldsep <- ',' / ';' + operatorOr <- 'or' + operatorAnd <- 'and' + operatorComparison<- '<=' / '>=' / '~=' / '==' / '<' !'<' / '>' !'>' + operatorStrcat <- !'...' '..' + operatorAddSub <- '+' / '-' + operatorMulDivMod<- '*' / '%' / '//' / '/' + operatorBitwise <- '&' / '|' / !'~=' '~' / '<<' / '>>' + operatorUnary <- 'not' / '#' / '-' / !'~=' '~' + operatorPower <- '^' + number <- FLOAT / HEX_FLOAT / HEX / INT + string <- NORMALSTRING / CHARSTRING / LONGSTRING + -- lexer + fragment + RESERVED <- KEYWORDS !IDREST + fragment + IDREST <- [a-zA-Z_0-9] + fragment + KEYWORDS <- 'and' / 'break' / 'do' / 'elseif' / 'else' / 'end' / + 'false' / 'for' / 'function' / 'goto' / 'if' / 'in' / + 'local' / 'nil' / 'not' / 'or' / 'repeat' / 'return' / + 'then' / 'true' / 'until' / 'while' + NAME <- !RESERVED [a-zA-Z_] [a-zA-Z_0-9]* + fragment + NORMALSTRING <- '"' {( ESC / [^"\] )*} '"'^ErrQuote + fragment + CHARSTRING <- "'" {( ESC / [^\'] )*} "'"^ErrQuote + fragment + LONGSTRING <- (OPEN {(!CLOSEEQ .)*} CLOSE^ErrCloseLStr) -> 1 -- capture only the string + + fragment + OPEN <- '[' {:openEq: EQUALS :} '[' %nl? + fragment + CLOSE <- ']' {EQUALS} ']' + fragment + EQUALS <- '='* + fragment + CLOSEEQ <- (CLOSE =openEq) => equals + + INT <- DIGIT+ + HEX <- '0' [xX] HEXDIGIT+^ErrDigitHex + FLOAT <- DIGIT+ '.' DIGIT* ExponentPart? / + '.' !'.' DIGIT+^ErrDigitDeci ExponentPart? / + DIGIT+ ExponentPart + HEX_FLOAT <- '0' [xX] HEXDIGIT+ '.' HEXDIGIT* HexExponentPart? / + '0' [xX] '.' HEXDIGIT+ HexExponentPart? / + '0' [xX] HEXDIGIT+^ErrDigitHex HexExponentPart + fragment + ExponentPart <- [eE] [+-]? DIGIT+^ErrDigitExpo + fragment + HexExponentPart <- [pP] [+-]? DIGIT+^ErrDigitExpo + fragment + ESC <- '\' [abfnrtvz"'\] / + '\' %nl / + DECESC / + HEXESC/ + UTFESC/ + '\' %{ErrEscSeq} + fragment + DECESC <- '\' ( DIGIT DIGIT? / [0-2] DIGIT DIGIT) + fragment + HEXESC <- '\' 'x' (HEXDIGIT HEXDIGIT)^ErrHexEsc + fragment + UTFESC <- '\' 'u' '{'^ErrOBraceUEsc HEXDIGIT+^ErrDigitUEsc '}'^ErrCBraceUEsc + fragment + DIGIT <- [0-9] + fragment + HEXDIGIT <- [0-9a-fA-F] + + + fragment + COMMENT <- '--' LONGSTRING -> 0 -- skip this + fragment + LINE_COMMENT <- '--' COM_TYPES ( %nl / !.) + fragment + COM_TYPES <- '[' '='* [^[=%nl] [^%nl]* / + '[' '='* / + [^[%nl] [^%nl]* / + '' + fragment + SHEBANG <- '#' '!' [^%nl]* + + + SKIP <- %nl / %s / COMMENT / LINE_COMMENT / SHEBANG + fragment + HELPER <- RESERVED / '(' / ')' -- for sync expression + SYNC <- ((!HELPER !SKIP .)+ / .?) SKIP* -- either sync to reserved keyword or skip characters and consume them + +]==],{ equals = equals, fixexp = fixexp, fold = fold }) +local errnr = 1 +local function err (desc, line, col, sfail, recexp) + print("Syntax error #"..errnr..": "..desc.." at line "..line.."(col "..col..")") + errnr = errnr+1 +end +local function parse (input) + errnr = 1 + local ast, errs = pg.parse(input,grammar,err) + return ast, errs +end +return {parse=parse} diff --git a/06/parser-gen/parsers/tiny-parser.lua b/06/parser-gen/parsers/tiny-parser.lua new file mode 100644 index 0000000..3a696e5 --- /dev/null +++ b/06/parser-gen/parsers/tiny-parser.lua @@ -0,0 +1,55 @@ +package.path = package.path .. ";../?.lua" +local pg = require "parser-gen" +local peg = require "peg-parser" +local errs = {errMissingThen = "Missing Then"} +pg.setlabels(errs) + + +local grammar = pg.compile([[ + + program <- stmtsequence !. + stmtsequence <- statement (';' statement)* + statement <- ifstmt / repeatstmt / assignstmt / readstmt / writestmt + ifstmt <- 'if' exp 'then'^errMissingThen stmtsequence elsestmt? 'end' + elsestmt <- ('else' stmtsequence) + repeatstmt <- 'repeat' stmtsequence 'until' exp + assignstmt <- IDENTIFIER ':=' exp + readstmt <- 'read' IDENTIFIER + writestmt <- 'write' exp + exp <- simpleexp (COMPARISONOP simpleexp)* + COMPARISONOP <- '<' / '=' + simpleexp <- term (ADDOP term)* + ADDOP <- [+-] + term <- factor (MULOP factor)* + MULOP <- [*/] + factor <- '(' exp ')' / NUMBER / IDENTIFIER + + NUMBER <- '-'? [0-9]+ + KEYWORDS <- 'if' / 'repeat' / 'read' / 'write' / 'then' / 'else' / 'end' / 'until' + RESERVED <- KEYWORDS ![a-zA-Z] + IDENTIFIER <- !RESERVED [a-zA-Z]+ + HELPER <- ';' / %nl / %s / KEYWORDS / !. + SYNC <- (!HELPER .)* + +]], _, true) +local errors = 0 +local function printerror(desc,line,col,sfail,trec) + errors = errors+1 + print("Error #"..errors..": "..desc.." on line "..line.."(col "..col..")") +end + + +local function parse(input) + errors = 0 + result, errors = pg.parse(input,grammar,printerror) + return result, errors +end + +if arg[1] then + -- argument must be in quotes if it contains spaces + res, errs = parse(arg[1]) + peg.print_t(res) + peg.print_r(errs) +end +local ret = {parse=parse} +return ret diff --git a/06/parser-gen/peg-parser-tests.lua b/06/parser-gen/peg-parser-tests.lua new file mode 100644 index 0000000..588b101 --- /dev/null +++ b/06/parser-gen/peg-parser-tests.lua @@ -0,0 +1,260 @@ +local peg = require "peg-parser" +local f = peg.pegToAST + +local eq = require "equals" +local equals = eq.equals + + +-- self-description of peg-parser: + +--assert(f(peg.gram)) + +-- ( p ) grouping +e = f("('a')") +res = {t="a"} + +assert(equals(e,res)) + +-- 'string' literal string + +e = f("'string'") +res = {t="string"} +assert(equals(e,res)) + +-- "string" literal string +e = f('"string"') +res = {t="string"} + +assert(equals(e,res)) +--[class] character class +e = f("[^a-zA-Z01]") +res = { + action = "invert", + op1 = { + action = "or", + op1 = { + action = "or", + op1 = { + action = "or", + op1 = { + action = "range", + op1 = { + s = "az" + } + }, + op2 = { + action = "range", + op1 = { + s = "AZ" + } + } + }, + op2 = { + t = "0" + } + }, + op2 = { + t = "1" + } + } +} + + +assert(equals(e,res)) + +--. any character +e = f(".") +res = {action="anychar"} + +assert(equals(e,res)) +--%name pattern defs[name] or a pre-defined pattern +e = f("%name") +res = {action="%", op1={s="name"}} + +assert(equals(e,res)) +--name non terminal +e = f("name") +res = {nt="name"} + +assert(equals(e,res)) + +-- non terminal +e = f("") +res = {nt="name"} + +assert(equals(e,res)) + +--{} position capture +e = f("{}") + +res = {action="poscap"} + +assert(equals(e,res)) + +--{ p } simple capture +e = f("{name}") +res = {action="scap", op1= {nt="name"}} + +assert(equals(e,res)) + +--{: p :} anonymous group capture +e = f("{:name:}") +res = {action="gcap", op1= {nt="name"}} + +assert(equals(e,res)) + +--{:name: p :} named group capture +e = f("{:g: name:}") +res = {action="gcap", op1= {nt="name"} , op2={s="g"}} + +assert(equals(e,res)) +--{~ p ~} substitution capture +e = f("{~ name ~}") + +res = {action="subcap", op1= {nt="name"}} + +assert(equals(e,res)) + +--{| p |} table capture +e = f("{| name |}") +res = {action="tcap", op1= {nt="name"}} +assert(equals(e,res)) + +--=name back reference +e = f("=name") +res = {action="bref", op1= {s="name"}} +assert(equals(e,res)) + +--p ? optional match +e = f("name?") +res = {action="?", op1= {nt="name"}} +assert(equals(e,res)) + +--p * zero or more repetitions +e = f("name*") +res = {action="*", op1= {nt="name"}} +assert(equals(e,res)) + +--p + one or more repetitions +e = f("name+") +res = {action="+", op1= {nt="name"}} +assert(equals(e,res)) + +--p^num exactly n repetitions +e = f("name^3") +res = {action="^", op1= {nt="name"}, op2 = {num="3"}} +assert(equals(e,res)) + +--p^+num at least n repetitions +e = f("name^+3") +res = {action="^", op1= {nt="name"}, op2 = {num="+3"}} +assert(equals(e,res)) + +--p^-num at most n repetitions +e = f("name^-3") +res = {action="^", op1= {nt="name"}, op2 = {num="-3"}} +assert(equals(e,res)) + +--p^LABEL error label +e = f("name^err") +res = {action = "^LABEL", op1= {nt="name"}, op2 = {s="err"}} +assert(equals(e,res)) + +--p -> 'string' string capture +e = f("name -> 'a'") +res = {action="->", op1= {nt="name"}, op2 = {s="a"}} +assert(equals(e,res)) + +--p -> "string" string capture +e = f('name -> "a"') +res = {action="->", op1= {nt="name"}, op2 = {s="a"}} +assert(equals(e,res)) + +--p -> num numbered capture + +e = f('name -> 3') + +res = {action="->", op1= {nt="name"}, op2 = {num="3"}} + +assert(equals(e,res)) + +--p -> name function/query/string capture equivalent to p / defs[name] + +e = f('name -> func') +res = {action="->", op1= {nt="name"}, op2 = {func="func"}} + +assert(equals(e,res)) + + + +--p => name match-time capture equivalent to lpeg.Cmt(p, defs[name]) + +e = f('name => func') +res = {action="=>", op1= {nt="name"}, op2 = {func="func"}} + +assert(equals(e,res)) + + +--& p and predicate + +e = f('&name') +res = {action="&", op1= {nt="name"}} + +assert(equals(e,res)) + + +--! p not predicate + + +e = f('!name') +res = {action="!", op1= {nt="name"}} + +assert(equals(e,res)) + + +--p1 p2 p3 concatenation with left association + +e = f('name name2 name3') +res = {action="and", op1= {action = "and", op1={nt="name"}, op2={nt="name2"}}, op2={nt="name3"}} + +assert(equals(e,res)) + +--p1 / p2 / p3 ordered choice with left association + +e = f('name / name2 / name3') +res = {action="or", op1= {action = "or", op1={nt="name"}, op2={nt="name2"}}, op2={nt="name3"}} + +assert(equals(e,res)) + + +--(name <- p)+ grammar + +e = f('a <- b b <- c') +res = { + {rulename = "a", rule = {nt="b"}}, + {rulename = "b", rule = {nt="c"}} +} + +assert(equals(e,res)) + +-- error labels +-- %{errName} + +--peg.setlabels({errName=1}) +e = f('%{errName}') + +res = {action="label", op1={s="errName"}} + +assert(equals(e,res)) + +-- a //{errName,errName2} b + +--peg.setlabels({errName=1, errName2=2}) +e = f('a //{errName,errName2} b') + +res = {action="or", condition={{s="errName"},{s="errName2"}}, op1={nt="a"}, op2={nt="b"}} + + +assert(equals(e,res)) + +print("all tests succesful") \ No newline at end of file diff --git a/06/parser-gen/peg-parser.lua b/06/parser-gen/peg-parser.lua new file mode 100644 index 0000000..f6fad7f --- /dev/null +++ b/06/parser-gen/peg-parser.lua @@ -0,0 +1,334 @@ +local re = require "lpeglabel.relabel" + +local peg = {} + +-- from relabel.lua + +local errinfo = { + {"NoPatt", "no pattern found"}, + {"ExtraChars", "unexpected characters after the pattern"}, + + {"ExpPatt1", "expected a pattern after '/' or '//{...}'"}, + + {"ExpPatt2", "expected a pattern after '&'"}, + {"ExpPatt3", "expected a pattern after '!'"}, + + {"ExpPatt4", "expected a pattern after '('"}, + {"ExpPatt5", "expected a pattern after ':'"}, + {"ExpPatt6", "expected a pattern after '{~'"}, + {"ExpPatt7", "expected a pattern after '{|'"}, + + {"ExpPatt8", "expected a pattern after '<-'"}, + + {"ExpPattOrClose", "expected a pattern or closing '}' after '{'"}, + + {"ExpNum", "expected a number after '^', '+' or '-' (no space)"}, + {"ExpNumOrLab", "expected a number or a label after ^"}, + {"ExpCap", "expected a string, number, '{}' or name after '->'"}, + + {"ExpName1", "expected the name of a rule after '=>'"}, + {"ExpName2", "expected the name of a rule after '=' (no space)"}, + {"ExpName3", "expected the name of a rule after '<' (no space)"}, + + {"ExpLab1", "expected at least one label after '{'"}, + {"ExpLab2", "expected a label after the comma"}, + + {"ExpNameOrLab", "expected a name or label after '%' (no space)"}, + + {"ExpItem", "expected at least one item after '[' or '^'"}, + + {"MisClose1", "missing closing ')'"}, + {"MisClose2", "missing closing ':}'"}, + {"MisClose3", "missing closing '~}'"}, + {"MisClose4", "missing closing '|}'"}, + {"MisClose5", "missing closing '}'"}, -- for the captures + + {"MisClose6", "missing closing '>'"}, + {"MisClose7", "missing closing '}'"}, -- for the labels + + {"MisClose8", "missing closing ']'"}, + + {"MisTerm1", "missing terminating single quote"}, + {"MisTerm2", "missing terminating double quote"}, +} + +local errmsgs = {} +local labels = {} + +for i, err in ipairs(errinfo) do + errmsgs[i] = err[2] + labels[err[1]] = i +end + +re.setlabels(labels) + +local function concat(a,b) + return a..b +end +local function foldtable(action,t) + local re + local first = true + for key,value in pairs(t) do + if first then + re = value + first = false + else + + local temp = re + if action == "suf" then -- suffix actions + local act = value[1] + if act == "*" or act == "?" or act == "+" then + re = {action=act, op1=temp} + else + re = {action=act, op1=temp, op2=value[2]} + end + elseif action == "or" and #value == 2 then -- recovery expression + local labels = value[1] + local op2 = value[2] + re = {action=action, op1=temp, op2=op2, condition=labels} + else + re = {action=action, op1=temp, op2=value} + end + end + end + return re +end + + +local gram = [=[ + + pattern <- (exp / %{NoPatt}) (!. / %{ExtraChars}) + exp <- S (grammar / alternative) + + labels <- {| '{' {: (label / %{ExpLab1}) :} (',' {: (label / %{ExpLab2}) :})* ('}' / %{MisClose7}) |} + + + alternative <- ( {:''->'or':} {| {: seq :} ('/' (('/' {| {: labels :} S {: (seq / %{ExpPatt1}) :} |}) / (S {: (seq / %{ExpPatt1}) :} ) ) )* |} ) -> foldtable + + + seq <- ( {:''->'and':} {| {: prefix :}+ |} ) -> foldtable + + + prefix <- {| {:action: '&' :} S {:op1: (prefix / %{ExpPatt2}) :} |} + / {| {:action: '!' :} S {:op1: (prefix / %{ExpPatt3}) :} |} + / suffix + + suffix <- ( {:''->'suf':} {| primary S {| suffixaction S |}* |} ) -> foldtable + + + suffixaction <- {[+*?]} + / {'^'} {| {:num: [+-]? NUM:} |} + / '^'->'^LABEL' (label / %{ExpNumOrLab}) + / {'->'} S ((string / {| {:action:'{}'->'poscap':} |} / funcname / {|{:num: NUM :} |}) / %{ExpCap}) + / {'=>'} S (funcname / %{ExpName1}) + + + + + primary <- '(' (exp / %{ExpPatt4}) (')' / %{MisClose1}) + / term + / class + / defined + / {| {:action: '%'->'label':} ('{' / %{ExpNameOrLab}) S ({:op1: label:} / %{ExpLab1}) S ('}' / %{MisClose7}) |} + / {| {:action: '{:'->'gcap':} {:op2: defname:} ':' !'}' ({:op1:exp:} / %{ExpPatt5}) (':}' / %{MisClose2}) |} + / {| {:action: '{:'->'gcap':} ({:op1:exp:} / %{ExpPatt5}) (':}' / %{MisClose2}) |} + / {| {:action: '='->'bref':} ({:op1: defname:} / %{ExpName2}) |} + / {| {:action: '{}'->'poscap':} |} + / {| {:action: '{~'->'subcap':} ({:op1: exp:} / %{ExpPatt6}) ('~}' / %{MisClose3}) |} + / {| {:action: '{|'->'tcap':} ({:op1: exp:} / %{ExpPatt7}) ('|}' / %{MisClose4}) |} + / {| {:action: '{'->'scap':} ({:op1: exp:} / %{ExpPattOrClose}) ('}' / %{MisClose5}) |} + / {| {:action: '.'->'anychar':} |} + / !frag !nodee name S !ARROW + / '<' (name / %{ExpName3}) ('>' / %{MisClose6}) -- old-style non terminals + + grammar <- {| definition+ |} + definition <- {| (frag / nodee)? (token / nontoken) S ARROW ({:rule: exp :} / %{ExpPatt8}) |} + + label <- {| {:s: ERRORNAME :} |} + + frag <- {:fragment: 'fragment'->'1' :} ![0-9_a-z] S !ARROW + nodee <- {:node: 'node'->'1' :} ![0-9_a-z] S !ARROW + token <- {:rulename: TOKENNAME :} {:token:''->'1':} + nontoken <- {:rulename: NAMESTRING :} + + class <- '[' ( ('^' {| {:action:''->'invert':} {:op1: classset :} |} ) / classset ) (']' / %{MisClose8}) + classset <- ( {:''->'or':} {| {: (item / %{ExpItem}) :} (!']' {: (item / %{ExpItem}) :})* |} ) -> foldtable + item <- defined / range / {| {:t: . :} |} + range <- {| {:action:''->'range':} {:op1: {| {:s: ({: . :} ('-') {: [^]] :} ) -> concat :} |} :} |} + + S <- (%s / '--' [^%nl]*)* -- spaces and comments + name <- {| {:nt: TOKENNAME :} {:token:''->'1':} / {:nt: NAMESTRING :} |} + + funcname <- {| {:func: NAMESTRING :} |} + ERRORNAME <- NAMESTRING + NAMESTRING <- [A-Za-z][A-Za-z0-9_]* + TOKENNAME <- [A-Z_]+ ![0-9a-z] + defname <- {| {:s: NAMESTRING :} |} + ARROW <- '<-' + NUM <- [0-9]+ + term <- {| '"' {:t: [^"]* :} ('"' / %{MisTerm2}) / "'" {:t: [^']* :} ("'" / %{MisTerm1}) |} + string <- {| '"' {:s: [^"]* :} ('"' / %{MisTerm2}) / "'" {:s: [^']* :} ("'" / %{MisTerm1}) |} + defined <- {| {:action: '%':} {:op1: defname :} |} +]=] + +local defs = {foldtable=foldtable, concat=concat} +peg.gram = gram +peg.defs = defs +peg.labels = labels +local p = re.compile ( gram, defs) + + + + +--[[ +Function: pegToAST(input) + +Input: a grammar in PEG format, described in https://github.com/vsbenas/parser-gen + +Output: if parsing successful - a table of grammar rules, else - runtime error + +Example input: " + + Program <- stmt* / SPACE + stmt <- ('a' / 'b')+ + SPACE <- '' + +" + +Example output: { + {rulename = "Program", rule = {action = "or", op1 = {action = "*", op1 = {nt = "stmt"}}, op2 = {nt = "SPACE", token="1"}}}, + {rulename = "stmt", rule = {action = "+", op1 = {action="or", op1 = {t = "a"}, op2 = {t = "b"}}}}, + {rulename = "SPACE", rule = {t=""}, token=1}, +} + +The rules are further processed and turned into lpeg compatible format in parser-gen.lua + +Action names: +or (has parameter condition for recovery expresions) +and +& +! ++ +* +? +^num (num is a number with an optional plus or minus sign) +^label (label is an error label set with setlabels) +-> +=> +tcap +gcap (op2= name, anonymous otherwise) +bref +poscap +subcap +scap +anychar +label +% +range + +Final token actions: +t - terminal +nt - non terminal +func - function definition +s - literal string +num - literal number +]]-- +local function splitlines(str) + local t = {} + local function helper(line) table.insert(t, line) return "" end + helper((str:gsub("(.-)\r?\n", helper))) + return t +end +function peg.pegToAST(input, defs) + local r, e, sfail = p:match(input, defs) + if not r then + local lab + if e == 0 then + lab = "Syntax error" + else + lab = errmsgs[e] + end + local lines = splitlines(input) + local line, col = re.calcline(input, #input - #sfail + 1) + local err = {} + table.insert(err, "L" .. line .. ":C" .. col .. ": " .. lab) + table.insert(err, lines[line]) + table.insert(err, string.rep(" ", col-1) .. "^") + error("syntax error(s) in pattern\n" .. table.concat(err, "\n"), 3) + end + return r +end + + +function peg.print_r ( t ) -- for debugging + local print_r_cache={} + local function sub_print_r(t,indent) + if (print_r_cache[tostring(t)]) then + print(indent.."*"..tostring(t)) + else + print_r_cache[tostring(t)]=true + if (type(t)=="table") then + for pos,val in pairs(t) do + if (type(val)=="table") then + print(indent.."["..pos.."] => {") + sub_print_r(val,indent..string.rep(" ",string.len(pos)+8)) + print(indent..string.rep(" ",string.len(pos)+6).."}") + else + print(indent.."["..pos.."] => '"..tostring(val).."'") + end + end + else + print(indent..tostring(t)) + end + end + end + sub_print_r(t,"") +end +function peg.print_t ( t ) -- for debugging + local print_r_cache={} + local function sub_print_r (t,indent) + if (print_r_cache[tostring(t)]) then + print(indent.."*"..tostring(t)) + else + print_r_cache[tostring(t)]=true + if (type(t)=="table") then + local function subprint (pos,val,indent) + if (type(val)=="table") then + print(indent.."{") + sub_print_r(val,indent..string.rep(" ",string.len(pos)+8)) + print(indent..string.rep(" ",string.len(pos)-1).."},") + else + if type(val) ~= "number" then + val = "'"..tostring(val).."'" + end + + if tonumber(pos) then + print(indent..val..",") + else + print(indent..pos.."="..val..",") + end + end + end + if t["rule"] then + subprint("rule",t["rule"],indent) + end + if t["pos"] then + subprint("pos",t["pos"],indent) + end + for pos,val in pairs(t) do + if pos ~= "rule" and pos ~= "pos" then + subprint(pos,val,indent) + end + end + else + print(indent..tostring(t)) + end + end + end + sub_print_r(t,"") +end + +function peg.calcline(subject, pos) + return re.calcline(subject,pos) +end +return peg \ No newline at end of file diff --git a/06/parser-gen/rockspecs/parser-gen-1.0.rockspec b/06/parser-gen/rockspecs/parser-gen-1.0.rockspec new file mode 100644 index 0000000..8d3c886 --- /dev/null +++ b/06/parser-gen/rockspecs/parser-gen-1.0.rockspec @@ -0,0 +1,27 @@ +package = "parser-gen" +version = "1.0-7" +source = { + url = "git://github.com/vsbenas/parser-gen", + tag = "v1.0" +} +description = { + summary = "A PEG parser generator that handles space characters, generates ASTs and adds error labels automatically.", + homepage = "https://github.com/vsbenas/parser-gen", + license = "MIT/X11" +} +dependencies = { + "lua >= 5.1, < 5.4", + "lpeglabel >= 0.12.2" +} +build = { + type = "builtin", + modules = { + ["parser-gen"] = "parser-gen.lua", + ["peg-parser"] = "peg-parser.lua", + ["stack"] = "stack.lua", + ["equals"] = "equals.lua", + ["errorgen"] = "errorgen.lua", + + + } +} \ No newline at end of file diff --git a/06/parser-gen/rockspecs/parser-gen-1.1.rockspec b/06/parser-gen/rockspecs/parser-gen-1.1.rockspec new file mode 100644 index 0000000..ff67135 --- /dev/null +++ b/06/parser-gen/rockspecs/parser-gen-1.1.rockspec @@ -0,0 +1,27 @@ +package = "parser-gen" +version = "1.1-0" +source = { + url = "git://github.com/vsbenas/parser-gen", + tag = "v1.1" +} +description = { + summary = "A PEG parser generator that handles space characters, generates ASTs and adds error labels automatically.", + homepage = "https://github.com/vsbenas/parser-gen", + license = "MIT/X11" +} +dependencies = { + "lua >= 5.1, < 5.4", + "lpeglabel >= 0.12.2" +} +build = { + type = "builtin", + modules = { + ["parser-gen"] = "parser-gen.lua", + ["peg-parser"] = "peg-parser.lua", + ["stack"] = "stack.lua", + ["equals"] = "equals.lua", + ["errorgen"] = "errorgen.lua", + + + } +} \ No newline at end of file diff --git a/06/parser-gen/rockspecs/parser-gen-1.2.rockspec b/06/parser-gen/rockspecs/parser-gen-1.2.rockspec new file mode 100644 index 0000000..fec828a --- /dev/null +++ b/06/parser-gen/rockspecs/parser-gen-1.2.rockspec @@ -0,0 +1,27 @@ +package = "parser-gen" +version = "1.2-0" +source = { + url = "git://github.com/vsbenas/parser-gen", + tag = "v1.2" +} +description = { + summary = "A PEG parser generator that handles space characters, generates ASTs and adds error labels automatically.", + homepage = "https://github.com/vsbenas/parser-gen", + license = "MIT/X11" +} +dependencies = { + "lua >= 5.1, < 5.4", + "lpeglabel >= 0.12.2" +} +build = { + type = "builtin", + modules = { + ["parser-gen"] = "parser-gen.lua", + ["peg-parser"] = "peg-parser.lua", + ["stack"] = "stack.lua", + ["equals"] = "equals.lua", + ["errorgen"] = "errorgen.lua", + + + } +} \ No newline at end of file diff --git a/06/parser-gen/stack.lua b/06/parser-gen/stack.lua new file mode 100644 index 0000000..3367192 --- /dev/null +++ b/06/parser-gen/stack.lua @@ -0,0 +1,67 @@ +-- Stack Table +-- Uses a table as stack, use :push(value) and
:pop() +-- Lua 5.1 compatible +local unpack = unpack or table.unpack +-- GLOBAL +local Stack = {} + +-- Create a Table with stack functions +function Stack:Create() + + -- stack table + local t = {} + -- entry table + t._et = {} + + -- push a value on to the stack + function t:push(...) + if ... then + local targs = {...} + -- add values + for _,v in ipairs(targs) do + table.insert(self._et, v) + end + end + end + + -- pop a value from the stack + function t:pop(num) + + -- get num values from stack + local num = num or 1 + + -- return table + local entries = {} + + -- get values into entries + for i = 1, num do + -- get last entry + if #self._et ~= 0 then + table.insert(entries, self._et[#self._et]) + -- remove last value + table.remove(self._et) + else + break + end + end + -- return unpacked entries + return unpack(entries) + end + + -- get entries + function t:getn() + return #self._et + end + + -- list values + function t:list() + for i,v in pairs(self._et) do + print(i, v) + end + end + return t +end + +return {Stack=Stack} + +-- CHILLCODE™ \ No newline at end of file diff --git a/06/src/main.c b/06/src/main.c new file mode 100644 index 0000000..83aab82 --- /dev/null +++ b/06/src/main.c @@ -0,0 +1,24 @@ +#include +#include +#include +#include +#include +#include "lptree.h" + +int main (void) { + int error; + lua_State *L = luaL_newstate(); + luaL_openlibs(L); + + luaopen_lpeglabel(L); + lua_setglobal(L, "m"); + luaL_loadfile(L, "main.lua"); + error = lua_pcall(L, 0, LUA_MULTRET, 0); + if (error) { + fprintf(stderr, "%s", lua_tostring(L, -1)); + lua_pop(L, 1); /* pop error message from the stack */ + } + printf("\n"); + lua_close(L); + return 0; +} \ No newline at end of file diff --git a/06/zig.peg b/06/zig.peg new file mode 100644 index 0000000..a8f2033 --- /dev/null +++ b/06/zig.peg @@ -0,0 +1,518 @@ +Root <- skip container_doc_comment? ContainerMembers eof + +ContainerMembers <- ContainerDeclarations (ContainerField COMMA)* (ContainerField / ContainerDeclarations) + +ContainerDeclarations + <- TestDecl ContainerDeclarations + / TopLevelComptime ContainerDeclarations + / doc_comment? KEYWORD_pub? TopLevelDecl ContainerDeclarations + + +TestDecl <- doc_comment? KEYWORD_test STRINGLITERALSINGLE? Block + +TopLevelComptime <- doc_comment? KEYWORD_comptime BlockExpr + +TopLevelDecl + <- (KEYWORD_export / KEYWORD_extern STRINGLITERALSINGLE? / (KEYWORD_inline / KEYWORD_noinline))? FnProto (SEMICOLON / Block) + / (KEYWORD_export / KEYWORD_extern STRINGLITERALSINGLE?)? KEYWORD_threadlocal? VarDecl + / KEYWORD_usingnamespace Expr SEMICOLON + +FnProto <- KEYWORD_fn IDENTIFIER? LPAREN ParamDeclList RPAREN ByteAlign? LinkSection? CallConv? EXCLAMATIONMARK? TypeExpr + +VarDecl <- (KEYWORD_const / KEYWORD_var) IDENTIFIER (COLON TypeExpr)? ByteAlign? LinkSection? (EQUAL Expr)? SEMICOLON + +ContainerField <- doc_comment? KEYWORD_comptime? IDENTIFIER (COLON (KEYWORD_anytype / TypeExpr) ByteAlign?)? (EQUAL Expr)? + +Statement + <- KEYWORD_comptime? VarDecl + / KEYWORD_comptime BlockExprStatement + / KEYWORD_nosuspend BlockExprStatement + / KEYWORD_suspend BlockExprStatement + / KEYWORD_defer BlockExprStatement + / KEYWORD_errdefer Payload? BlockExprStatement + / IfStatement + / LabeledStatement + / SwitchExpr + / AssignExpr SEMICOLON + +IfStatement + <- IfPrefix BlockExpr ( KEYWORD_else Payload? Statement )? + / IfPrefix AssignExpr ( SEMICOLON / KEYWORD_else Payload? Statement ) + +LabeledStatement <- BlockLabel? (Block / LoopStatement) + +LoopStatement <- KEYWORD_inline? (ForStatement / WhileStatement) + +ForStatement + <- ForPrefix BlockExpr ( KEYWORD_else Statement )? + / ForPrefix AssignExpr ( SEMICOLON / KEYWORD_else Statement ) + +WhileStatement + <- WhilePrefix BlockExpr ( KEYWORD_else Payload? Statement )? + / WhilePrefix AssignExpr ( SEMICOLON / KEYWORD_else Payload? Statement ) + +BlockExprStatement + <- BlockExpr + / AssignExpr SEMICOLON + +BlockExpr <- BlockLabel? Block + +AssignExpr <- Expr (AssignOp Expr)? + +Expr <- BoolOrExpr + +BoolOrExpr <- BoolAndExpr (KEYWORD_or BoolAndExpr)* + +BoolAndExpr <- CompareExpr (KEYWORD_and CompareExpr)* + +CompareExpr <- BitwiseExpr (CompareOp BitwiseExpr)? + +BitwiseExpr <- BitShiftExpr (BitwiseOp BitShiftExpr)* + +BitShiftExpr <- AdditionExpr (BitShiftOp AdditionExpr)* + +AdditionExpr <- MultiplyExpr (AdditionOp MultiplyExpr)* + +MultiplyExpr <- PrefixExpr (MultiplyOp PrefixExpr)* + +PrefixExpr <- PrefixOp* PrimaryExpr + +PrimaryExpr + <- AsmExpr + / IfExpr + / KEYWORD_break BreakLabel? Expr? + / KEYWORD_comptime Expr + / KEYWORD_nosuspend Expr + / KEYWORD_continue BreakLabel? + / KEYWORD_resume Expr + / KEYWORD_return Expr? + / BlockLabel? LoopExpr + / Block + / CurlySuffixExpr + +IfExpr <- IfPrefix Expr (KEYWORD_else Payload? Expr)? + +Block <- LBRACE Statement* RBRACE + +LoopExpr <- KEYWORD_inline? (ForExpr / WhileExpr) + +ForExpr <- ForPrefix Expr (KEYWORD_else Expr)? + +WhileExpr <- WhilePrefix Expr (KEYWORD_else Payload? Expr)? + +CurlySuffixExpr <- TypeExpr InitList? + +InitList + <- LBRACE FieldInit (COMMA FieldInit)* COMMA? RBRACE + / LBRACE Expr (COMMA Expr)* COMMA? RBRACE + / LBRACE RBRACE + +TypeExpr <- PrefixTypeOp* ErrorUnionExpr + +ErrorUnionExpr <- SuffixExpr (EXCLAMATIONMARK TypeExpr)? + +SuffixExpr + <- KEYWORD_async PrimaryTypeExpr SuffixOp* FnCallArguments + / PrimaryTypeExpr (SuffixOp / FnCallArguments)* + +PrimaryTypeExpr + <- BUILTINIDENTIFIER FnCallArguments + / CHAR_LITERAL + / ContainerDecl + / DOT IDENTIFIER + / DOT InitList + / ErrorSetDecl + / FLOAT + / FnProto + / GroupedExpr + / LabeledTypeExpr + / IDENTIFIER + / IfTypeExpr + / INTEGER + / KEYWORD_comptime TypeExpr + / KEYWORD_error DOT IDENTIFIER + / KEYWORD_anyframe + / KEYWORD_unreachable + / STRINGLITERAL + / SwitchExpr + +ContainerDecl <- (KEYWORD_extern / KEYWORD_packed)? ContainerDeclAuto + +ErrorSetDecl <- KEYWORD_error LBRACE IdentifierList RBRACE + +GroupedExpr <- LPAREN Expr RPAREN + +IfTypeExpr <- IfPrefix TypeExpr (KEYWORD_else Payload? TypeExpr)? + +LabeledTypeExpr + <- BlockLabel Block + / BlockLabel? LoopTypeExpr + +LoopTypeExpr <- KEYWORD_inline? (ForTypeExpr / WhileTypeExpr) + +ForTypeExpr <- ForPrefix TypeExpr (KEYWORD_else TypeExpr)? + +WhileTypeExpr <- WhilePrefix TypeExpr (KEYWORD_else Payload? TypeExpr)? + +SwitchExpr <- KEYWORD_switch LPAREN Expr RPAREN LBRACE SwitchProngList RBRACE + +AsmExpr <- KEYWORD_asm KEYWORD_volatile? LPAREN Expr AsmOutput? RPAREN + +AsmOutput <- COLON AsmOutputList AsmInput? + +AsmOutputItem <- LBRACKET IDENTIFIER RBRACKET STRINGLITERAL LPAREN (MINUSRARROW TypeExpr / IDENTIFIER) RPAREN + +AsmInput <- COLON AsmInputList AsmClobbers? + +AsmInputItem <- LBRACKET IDENTIFIER RBRACKET STRINGLITERAL LPAREN Expr RPAREN + +AsmClobbers <- COLON StringList + +BreakLabel <- COLON IDENTIFIER + +BlockLabel <- IDENTIFIER COLON + +FieldInit <- DOT IDENTIFIER EQUAL Expr + +WhileContinueExpr <- COLON LPAREN AssignExpr RPAREN + +LinkSection <- KEYWORD_linksection LPAREN Expr RPAREN + +CallConv <- KEYWORD_callconv LPAREN Expr RPAREN + +ParamDecl + <- doc_comment? (KEYWORD_noalias / KEYWORD_comptime)? (IDENTIFIER COLON)? ParamType + / DOT3 + +ParamType + <- KEYWORD_anytype + / TypeExpr + +IfPrefix <- KEYWORD_if LPAREN Expr RPAREN PtrPayload? + +WhilePrefix <- KEYWORD_while LPAREN Expr RPAREN PtrPayload? WhileContinueExpr? + +ForPrefix <- KEYWORD_for LPAREN Expr RPAREN PtrIndexPayload + +Payload <- PIPE IDENTIFIER PIPE + +PtrPayload <- PIPE ASTERISK? IDENTIFIER PIPE + +PtrIndexPayload <- PIPE ASTERISK? IDENTIFIER (COMMA IDENTIFIER)? PIPE + + +SwitchProng <- SwitchCase EQUALRARROW PtrPayload? AssignExpr + +SwitchCase + <- SwitchItem (COMMA SwitchItem)* COMMA? + / KEYWORD_else + +SwitchItem <- Expr (DOT3 Expr)? + +AssignOp + <- ASTERISKEQUAL + / SLASHEQUAL + / PERCENTEQUAL + / PLUSEQUAL + / MINUSEQUAL + / LARROW2EQUAL + / RARROW2EQUAL + / AMPERSANDEQUAL + / CARETEQUAL + / PIPEEQUAL + / ASTERISKPERCENTEQUAL + / PLUSPERCENTEQUAL + / MINUSPERCENTEQUAL + / EQUAL + +CompareOp + <- EQUALEQUAL + / EXCLAMATIONMARKEQUAL + / LARROW + / RARROW + / LARROWEQUAL + / RARROWEQUAL + +BitwiseOp + <- AMPERSAND + / CARET + / PIPE + / KEYWORD_orelse + / KEYWORD_catch Payload? + +BitShiftOp + <- LARROW2 + / RARROW2 + +AdditionOp + <- PLUS + / MINUS + / PLUS2 + / PLUSPERCENT + / MINUSPERCENT + +MultiplyOp + <- PIPE2 + / ASTERISK + / SLASH + / PERCENT + / ASTERISK2 + / ASTERISKPERCENT + +PrefixOp + <- EXCLAMATIONMARK + / MINUS + / TILDE + / MINUSPERCENT + / AMPERSAND + / KEYWORD_try + / KEYWORD_await + +PrefixTypeOp + <- QUESTIONMARK + / KEYWORD_anyframe MINUSRARROW + / SliceTypeStart (ByteAlign / KEYWORD_const / KEYWORD_volatile / KEYWORD_allowzero)* + / PtrTypeStart (KEYWORD_align LPAREN Expr (COLON INTEGER COLON INTEGER)? RPAREN / KEYWORD_const / KEYWORD_volatile / KEYWORD_allowzero)* + / ArrayTypeStart + +SuffixOp + <- LBRACKET Expr (DOT2 (Expr? (COLON Expr)?)?)? RBRACKET + / DOT IDENTIFIER + / DOTASTERISK + / DOTQUESTIONMARK + +FnCallArguments <- LPAREN ExprList RPAREN + +SliceTypeStart <- LBRACKET (COLON Expr)? RBRACKET + +PtrTypeStart + <- ASTERISK + / ASTERISK2 + / LBRACKET ASTERISK (LETTERC / COLON Expr)? RBRACKET + +ArrayTypeStart <- LBRACKET Expr (COLON Expr)? RBRACKET + +ContainerDeclAuto <- ContainerDeclType LBRACE container_doc_comment? ContainerMembers RBRACE + +ContainerDeclType + <- KEYWORD_struct + / KEYWORD_opaque + / KEYWORD_enum (LPAREN Expr RPAREN)? + / KEYWORD_union (LPAREN (KEYWORD_enum (LPAREN Expr RPAREN)? / Expr) RPAREN)? + +ByteAlign <- KEYWORD_align LPAREN Expr RPAREN + +IdentifierList <- (doc_comment? IDENTIFIER COMMA)* (doc_comment? IDENTIFIER)? + +SwitchProngList <- (SwitchProng COMMA)* SwitchProng? + +AsmOutputList <- (AsmOutputItem COMMA)* AsmOutputItem? + +AsmInputList <- (AsmInputItem COMMA)* AsmInputItem? + +StringList <- (STRINGLITERAL COMMA)* STRINGLITERAL? + +ParamDeclList <- (ParamDecl COMMA)* ParamDecl? + +ExprList <- (Expr COMMA)* Expr? + +eof <- !. +bin <- [01] +bin_ <- '_'? bin +oct <- [0-7] +oct_ <- '_'? oct +hex <- [0-9a-fA-F] +hex_ <- '_'? hex +dec <- [0-9] +dec_ <- '_'? dec + +bin_int <- bin bin_* +oct_int <- oct oct_* +dec_int <- dec dec_* +hex_int <- hex hex_* + +ox80_oxBF <- [\200-\277] +oxF4 <- '\364' +ox80_ox8F <- [\200-\217] +oxF1_oxF3 <- [\361-\363] +oxF0 <- '\360' +ox90_0xBF <- [\220-\277] +oxEE_oxEF <- [\356-\357] +oxED <- '\355' +ox80_ox9F <- [\200-\237] +oxE1_oxEC <- [\341-\354] +oxE0 <- '\340' +oxA0_oxBF <- [\240-\277] +oxC2_oxDF <- [\302-\337] + +mb_utf8_literal <- + oxF4 ox80_ox8F ox80_oxBF ox80_oxBF + / oxF1_oxF3 ox80_oxBF ox80_oxBF ox80_oxBF + / oxF0 ox90_0xBF ox80_oxBF ox80_oxBF + / oxEE_oxEF ox80_oxBF ox80_oxBF + / oxED ox80_ox9F ox80_oxBF + / oxE1_oxEC ox80_oxBF ox80_oxBF + / oxE0 oxA0_oxBF ox80_oxBF + / oxC2_oxDF ox80_oxBF + +ascii_char_not_nl_slash_squote <- [\000-\011\013-\046-\050-\133\135-\177] + +char_escape + <- "\\x" hex hex + / "\\u{" hex+ "}" + / "\\" [nr\\t'"] +char_char + <- mb_utf8_literal + / char_escape + / ascii_char_not_nl_slash_squote + +string_char + <- char_escape + / [^\\"\n] + +container_doc_comment <- ('//!' [^\n]* [ \n]*)+ +doc_comment <- ('///' [^\n]* [ \n]*)+ +line_comment <- '//' ![!/][^\n]* / '////' [^\n]* +line_string <- ("\\\\" [^\n]* [ \n]*)+ +skip <- ([ \n] / line_comment)* + +CHAR_LITERAL <- "'" char_char "'" skip +FLOAT + <- "0x" hex_int "." hex_int ([pP] [-+]? dec_int)? skip + / dec_int "." dec_int ([eE] [-+]? dec_int)? skip + / "0x" hex_int [pP] [-+]? dec_int skip + / dec_int [eE] [-+]? dec_int skip +INTEGER + <- "0b" bin_int skip + / "0o" oct_int skip + / "0x" hex_int skip + / dec_int skip +STRINGLITERALSINGLE <- "\"" string_char* "\"" skip +STRINGLITERAL + <- STRINGLITERALSINGLE + / (line_string skip)+ +IDENTIFIER + <- !keyword [A-Za-z_] [A-Za-z0-9_]* skip + / "@\"" string_char* "\"" skip +BUILTINIDENTIFIER <- "@"[A-Za-z_][A-Za-z0-9_]* skip + + +AMPERSAND <- '&' ![=] skip +AMPERSANDEQUAL <- '&=' skip +ASTERISK <- '*' ![*%=] skip +ASTERISK2 <- '**' skip +ASTERISKEQUAL <- '*=' skip +ASTERISKPERCENT <- '*%' ![=] skip +ASTERISKPERCENTEQUAL <- '*%=' skip +CARET <- '^' ![=] skip +CARETEQUAL <- '^=' skip +COLON <- ':' skip +COMMA <- ',' skip +DOT <- '.' ![*.?] skip +DOT2 <- '..' ![.] skip +DOT3 <- '...' skip +DOTASTERISK <- '.*' skip +DOTQUESTIONMARK <- '.?' skip +EQUAL <- '=' ![>=] skip +EQUALEQUAL <- '==' skip +EQUALRARROW <- '=>' skip +EXCLAMATIONMARK <- '!' ![=] skip +EXCLAMATIONMARKEQUAL <- '!=' skip +LARROW <- '<' ![<=] skip +LARROW2 <- '<<' ![=] skip +LARROW2EQUAL <- '<<=' skip +LARROWEQUAL <- '<=' skip +LBRACE <- '{' skip +LBRACKET <- '[' skip +LPAREN <- '(' skip +MINUS <- '-' ![%=>] skip +MINUSEQUAL <- '-=' skip +MINUSPERCENT <- '-%' ![=] skip +MINUSPERCENTEQUAL <- '-%=' skip +MINUSRARROW <- '->' skip +PERCENT <- '%' ![=] skip +PERCENTEQUAL <- '%=' skip +PIPE <- '|' ![|=] skip +PIPE2 <- '||' skip +PIPEEQUAL <- '|=' skip +PLUS <- '+' ![%+=] skip +PLUS2 <- '++' skip +PLUSEQUAL <- '+=' skip +PLUSPERCENT <- '+%' ![=] skip +PLUSPERCENTEQUAL <- '+%=' skip +LETTERC <- 'c' skip +QUESTIONMARK <- '?' skip +RARROW <- '>' ![>=] skip +RARROW2 <- '>>' ![=] skip +RARROW2EQUAL <- '>>=' skip +RARROWEQUAL <- '>=' skip +RBRACE <- '}' skip +RBRACKET <- ']' skip +RPAREN <- ')' skip +SEMICOLON <- ';' skip +SLASH <- '/' ![=] skip +SLASHEQUAL <- '/=' skip +TILDE <- '~' skip + +end_of_word <- ![a-zA-Z0-9_] skip +KEYWORD_align <- 'align' end_of_word +KEYWORD_allowzero <- 'allowzero' end_of_word +KEYWORD_and <- 'and' end_of_word +KEYWORD_anyframe <- 'anyframe' end_of_word +KEYWORD_anytype <- 'anytype' end_of_word +KEYWORD_asm <- 'asm' end_of_word +KEYWORD_async <- 'async' end_of_word +KEYWORD_await <- 'await' end_of_word +KEYWORD_break <- 'break' end_of_word +KEYWORD_callconv <- 'callconv' end_of_word +KEYWORD_catch <- 'catch' end_of_word +KEYWORD_comptime <- 'comptime' end_of_word +KEYWORD_const <- 'const' end_of_word +KEYWORD_continue <- 'continue' end_of_word +KEYWORD_defer <- 'defer' end_of_word +KEYWORD_else <- 'else' end_of_word +KEYWORD_enum <- 'enum' end_of_word +KEYWORD_errdefer <- 'errdefer' end_of_word +KEYWORD_error <- 'error' end_of_word +KEYWORD_export <- 'export' end_of_word +KEYWORD_extern <- 'extern' end_of_word +KEYWORD_fn <- 'fn' end_of_word +KEYWORD_for <- 'for' end_of_word +KEYWORD_if <- 'if' end_of_word +KEYWORD_inline <- 'inline' end_of_word +KEYWORD_noalias <- 'noalias' end_of_word +KEYWORD_nosuspend <- 'nosuspend' end_of_word +KEYWORD_noinline <- 'noinline' end_of_word +KEYWORD_opaque <- 'opaque' end_of_word +KEYWORD_or <- 'or' end_of_word +KEYWORD_orelse <- 'orelse' end_of_word +KEYWORD_packed <- 'packed' end_of_word +KEYWORD_pub <- 'pub' end_of_word +KEYWORD_resume <- 'resume' end_of_word +KEYWORD_return <- 'return' end_of_word +KEYWORD_linksection <- 'linksection' end_of_word +KEYWORD_struct <- 'struct' end_of_word +KEYWORD_suspend <- 'suspend' end_of_word +KEYWORD_switch <- 'switch' end_of_word +KEYWORD_test <- 'test' end_of_word +KEYWORD_threadlocal <- 'threadlocal' end_of_word +KEYWORD_try <- 'try' end_of_word +KEYWORD_union <- 'union' end_of_word +KEYWORD_unreachable <- 'unreachable' end_of_word +KEYWORD_usingnamespace <- 'usingnamespace' end_of_word +KEYWORD_var <- 'var' end_of_word +KEYWORD_volatile <- 'volatile' end_of_word +KEYWORD_while <- 'while' end_of_word + +keyword <- KEYWORD_align / KEYWORD_allowzero / KEYWORD_and / KEYWORD_anyframe + / KEYWORD_anytype / KEYWORD_asm / KEYWORD_async / KEYWORD_await + / KEYWORD_break / KEYWORD_callconv / KEYWORD_catch / KEYWORD_comptime + / KEYWORD_const / KEYWORD_continue / KEYWORD_defer / KEYWORD_else + / KEYWORD_enum / KEYWORD_errdefer / KEYWORD_error / KEYWORD_export + / KEYWORD_extern / KEYWORD_fn / KEYWORD_for / KEYWORD_if + / KEYWORD_inline / KEYWORD_noalias / KEYWORD_nosuspend / KEYWORD_noinline + / KEYWORD_opaque / KEYWORD_or / KEYWORD_orelse / KEYWORD_packed + / KEYWORD_pub / KEYWORD_resume / KEYWORD_return / KEYWORD_linksection + / KEYWORD_struct / KEYWORD_suspend / KEYWORD_switch / KEYWORD_test + / KEYWORD_threadlocal / KEYWORD_try / KEYWORD_union / KEYWORD_unreachable + / KEYWORD_usingnamespace / KEYWORD_var / KEYWORD_volatile / KEYWORD_while \ No newline at end of file diff --git a/Makefile b/Makefile index e66cb69..c9647d7 100644 --- a/Makefile +++ b/Makefile @@ -8,6 +8,7 @@ all: markdown README.html # don't compile all of 05 because it takes a while $(MAKE) -C 05 $(MAKE) -C 05 tcc + $(MAKE) -C 06 clean: $(MAKE) -C 00 clean $(MAKE) -C 01 clean @@ -16,6 +17,7 @@ clean: $(MAKE) -C 04 clean $(MAKE) -C 04a clean $(MAKE) -C 05 clean + $(MAKE) -C 06 clean rm -f markdown rm -f README.html markdown: markdown.c